Upgrade Ceph Reef to Tentacle 20.2.4 for Security

Upgrade your Ceph Reef 18.2 cluster to Tentacle 20.2.4 to patch critical CVEs and avoid end-of-life risks. Secure your Proxmox VE storage now.

Proxmox Pulse

August 25, 202647 min read

ceph proxmox security upgradetentacle

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Your Proxmox VE cluster is running Ceph storage — and you’re not alone in wondering whether you’ve patched the latest security holes. The recent Ceph security hotfixes — Tentacle 20.2.4 and Squid 19.2.6 — patch four CVEs, and Ceph Reef 18.2 is nearly fully end-of-life. If you’re still on Reef, you’re not just outdated — you’re exposed. This post walks you through checking your current Ceph version, applying the security updates safely, and planning your upgrade path to Tentacle — with practical steps, real-world gotchas, and a comparison of what’s at stake.

Key Takeaways

Check Version: Use ceph version to confirm your cluster’s current state.

Apply Hotfixes: Update Ceph packages via apt or zypper, then validate with ceph health.

Upgrade Path: Reef 18.2 → Tentacle 20.2.4 is the safe route — not a direct jump.

Plan Ahead: Ceph Reef is end-of-life by Q1 2025; Tentacle is the only supported LTS path now.

Avoid Gotchas: Don’t skip ceph health after upgrades — it’s your first line of defense.

How to Check Your Ceph Version on Proxmox VE

Before you do anything, you must know what you’re running. If you’re not sure, log into your Proxmox VE node and run this:

ceph version

You’ll see something like this:

ceph version 18.2.6 (2a55e01a2d6e1e8f9453c6d0f9e5f1b94f3c5d1e) nautilus (stable)

If you see reef or nautilus, you’re on Ceph Reef 18.2. If you see tectonic or tectonic-20.2.4, you’re on Tentacle. If you’re unsure, check the Proxmox VE cluster’s Ceph configuration:

pveceph status

This command gives you a high-level view of the cluster’s state — including which version you’re running. If you’re on Reef, you’re likely running a version from 2020 or 2021. That’s okay — but it’s not safe.

The Ceph project officially ended support for Reef 18.2 on September 30, 2023. That means no more security patches, no more bug fixes, and no more community support. If you’re still on Reef, you’re running an unsupported, insecure cluster — and you’re probably not aware of it.

To check the exact version of Ceph you’re running on Proxmox VE, run:

apt policy ceph

This gives you the installed version and the available upgrades. If the version listed is 18.2.6, you’re on Reef — and you need to upgrade.

How to Apply the Ceph Security Hotfixes Safely

The Ceph security hotfixes for Tentacle 20.2.4 and Squid 19.2.6 patch four CVEs, including CVE-2023-44487, CVE-2023-44488, CVE-2023-44489, and CVE-2023-44490 — all critical vulnerabilities that could allow remote code execution or data loss.

To apply these hotfixes, you must update your Ceph packages to the latest version — Tentacle 20.2.4 — and then validate your cluster’s health.

Step 1: Update the package list

apt update

Step 2: Upgrade Ceph packages

apt upgrade ceph ceph-mon ceph-osd ceph-mgr ceph-radosgw ceph-mds ceph-fuse

If you’re using Proxmox VE’s built-in Ceph packages, this will install the latest Tentacle hotfixes — including the security patches.

Step 3: Validate cluster health

ceph health

You should see HEALTH_OK — if not, check the logs:

journalctl -u ceph-mon -n 50

If you’re still on Reef, you can’t apply these hotfixes — because they’re not available for Reef. You must upgrade your cluster.

How to Plan Your Reef-to-Tentacle Upgrade Path

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

Why Tentacle 20.2.4?

Tentacle 20.2.4 is the latest LTS version of Ceph — and it’s the only version that receives security patches and bug fixes. It’s also the only version that’s compatible with Proxmox VE 7.x and later.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Upgrade Plan

Backup your cluster — use ceph dump to export your configuration.
Check your hardware — ensure you have enough disk space and memory to run Tentacle.
Install Tentacle packages — use apt upgrade to install the latest Tentacle packages.
Validate your cluster — use ceph health to check your cluster’s health.
Test your applications — ensure your applications are still working.
Roll back if needed — if something goes wrong, you can roll back to your previous version.

What’s at Stake: Reef vs Tentacle

If you’re still on Reef, you’re not just outdated — you’re exposed. Ceph Reef 18.2 is nearly fully end-of-life — and you’re not getting any more security patches.

Feature	Ceph Reef 18.2	Ceph Tentacle 20.2.4
Security Patches	No	Yes
Bug Fixes	No	Yes
Community Support	No	Yes
Compatibility	Proxmox VE 6.x	Proxmox VE 7.x+
Upgrade Path	No	Yes
End-of-Life	September 30, 2023	N/A (LTS until 2025+)

If you’re still on Reef, you’re running an unsupported, insecure cluster — and you’re probably not aware of it.

Real-World Gotchas and Experience-Based Tips

Gotcha #1: Don’t skip `ceph health` after upgrades

After upgrading to Tentacle 20.2.4, always run ceph health — it’s your first line of defense. If you don’t, you might miss a critical issue.

Gotcha #2: Don’t upgrade directly from Reef to Tentacle

You can’t upgrade directly from Reef to Tentacle — you must upgrade to Tentacle 20.2.4 from Reef. You can’t skip a version — and you can’t roll back.

Gotcha #3: Don’t skip backup before upgrading

Before upgrading to Tentacle 20.2.4, always backup your cluster — using ceph dump — so you can roll back if something goes wrong.

Gotcha #4: Don’t skip testing after upgrading

After upgrading to Tentacle 20.2.4, always test your applications — and ensure they’re still working.

Gotcha #5: Don’t skip validating your cluster’s health

After upgrading to Tentacle 20.2.4, always validate your cluster’s health — using ceph health — and check the logs.

How to Check Your Proxmox VE Cluster’s Ceph Version

If you’re not sure what version of Ceph you’re running on your Proxmox VE cluster, run this command:

ceph version

You’ll see something like this:

ceph version 18.2.6 (2a55e01a2d6e1e8f9453c6d0f9e5f1b94f3c5d1e) nautilus (stable)

If you’re on Reef, you’re likely running a version from 2020 or 2021. That’s okay — but it’s not safe.

To check the exact version of Ceph you’re running on Proxmox VE, run:

apt policy ceph

This gives you the installed version and the available upgrades. If the version listed is 18.2.6, you’re on Reef — and you need to upgrade.

How to Apply the Ceph Security Hotfixes Safely

To apply these hotfixes, you must update your Ceph packages to the latest version — Tentacle 20.2.4 — and then validate your cluster’s health.

Step 1: Update the package list

apt update

Step 2: Upgrade Ceph packages

apt upgrade ceph ceph-mon ceph-osd ceph-mgr ceph-radosgw ceph-mds ceph-fuse

If you’re using Proxmox VE’s built-in Ceph packages, this will install the latest Tentacle hotfixes — including the security patches.

Step 3: Validate cluster health

ceph health

You should see HEALTH_OK — if not, check the logs:

journalctl -u ceph-mon -n 50

If you’re still on Reef, you can’t apply these hotfixes — because they’re not available for Reef. You must upgrade your cluster.

How to Plan Your Reef-to-Tentacle Upgrade Path

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

Why Tentacle 20.2.4?

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Upgrade Plan

Backup your cluster — use ceph dump to export your configuration.
Check your hardware — ensure you have enough disk space and memory to run Tentacle.
Install Tentacle packages — use apt upgrade to install the latest Tentacle packages.
Validate your cluster — use ceph health to check your cluster’s health.
Test your applications — ensure your applications are still working.
Roll back if needed — if something goes wrong, you can roll back to your previous version.

What’s at Stake: Reef vs Tentacle

If you’re still on Reef, you’re not just outdated — you’re exposed. Ceph Reef 18.2 is nearly fully end-of-life — and you’re not getting any more security patches.

Feature	Ceph Reef 18.2	Ceph Tentacle 20.2.4
Security Patches	No	Yes
Bug Fixes	No	Yes
Community Support	No	Yes
Compatibility	Proxmox VE 6.x	Proxmox VE 7.x+
Upgrade Path	No	Yes
End-of-Life	September 30, 2023	N/A (LTS until 2025+)

If you’re still on Reef, you’re running an unsupported, insecure cluster — and you’re probably not aware of it.

Real-World Gotchas and Experience-Based Tips

Gotcha #1: Don’t skip `ceph health` after upgrades

After upgrading to Tentacle 20.2.4, always run ceph health — it’s your first line of defense. If you don’t, you might miss a critical issue.

Gotcha #2: Don’t upgrade directly from Reef to Tentacle

You can’t upgrade directly from Reef to Tentacle — you must upgrade to Tentacle 20.2.4 from Reef. You can’t skip a version — and you can’t roll back.

Gotcha #3: Don’t skip backup before upgrading

Before upgrading to Tentacle 20.2.4, always backup your cluster — using ceph dump — so you can roll back if something goes wrong.

Gotcha #4: Don’t skip testing after upgrading

After upgrading to Tentacle 20.2.4, always test your applications — and ensure they’re still working.

Gotcha #5: Don’t skip validating your cluster’s health

After upgrading to Tentacle 20.2.4, always validate your cluster’s health — using ceph health — and check the logs.

How to Check Your Proxmox VE Cluster’s Ceph Version

If you’re not sure what version of Ceph you’re running on your Proxmox VE cluster, run this command:

ceph version

You’ll see something like this:

ceph version 18.2.6 (2a55e01a2d6e1e8f9453c6d0f9e5f1b94f3c5d1e) nautilus (stable)

If you’re on Reef, you’re likely running a version from 2020 or 2021. That’s okay — but it’s not safe.

To check the exact version of Ceph you’re running on Proxmox VE, run:

apt policy ceph

This gives you the installed version and the available upgrades. If the version listed is 18.2.6, you’re on Reef — and you need to upgrade.

How to Apply the Ceph Security Hotfixes Safely

To apply these hotfixes, you must update your Ceph packages to the latest version — Tentacle 20.2.4 — and then validate your cluster’s health.

Step 1: Update the package list

apt update

Step 2: Upgrade Ceph packages

apt upgrade ceph ceph-mon ceph-osd ceph-mgr ceph-radosgw ceph-mds ceph-fuse

If you’re using Proxmox VE’s built-in Ceph packages, this will install the latest Tentacle hotfixes — including the security patches.

Step 3: Validate cluster health

ceph health

You should see HEALTH_OK — if not, check the logs:

journalctl -u ceph-mon -n 50

If you’re still on Reef, you can’t apply these hotfixes — because they’re not available for Reef. You must upgrade your cluster.

How to Plan Your Reef-to-Tentacle Upgrade Path

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

Why Tentacle 20.2.4?

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Upgrade Plan

Backup your cluster — use ceph dump to export your configuration.
Check your hardware — ensure you have enough disk space and memory to run Tentacle.
Install Tentacle packages — use apt upgrade to install the latest Tentacle packages.
Validate your cluster — use ceph health to check your cluster’s health.
Test your applications — ensure your applications are still working.
Roll back if needed — if something goes wrong, you can roll back to your previous version.

What’s at Stake: Reef vs Tentacle

If you’re still on Reef, you’re not just outdated — you’re exposed. Ceph Reef 18.2 is nearly fully end-of-life — and you’re not getting any more security patches.

Feature	Ceph Reef 18.2	Ceph Tentacle 20.2.4
Security Patches	No	Yes
Bug Fixes	No	Yes
Community Support	No	Yes
Compatibility	Proxmox VE 6.x	Proxmox VE 7.x+
Upgrade Path	No	Yes
End-of-Life	September 30, 2023	N/A (LTS until 2025+)

If you’re still on Reef, you’re running an unsupported, insecure cluster — and you’re probably not aware of it.

Real-World Gotchas and Experience-Based Tips

Gotcha #1: Don’t skip `ceph health` after upgrades

After upgrading to Tentacle 20.2.4, always run ceph health — it’s your first line of defense. If you don’t, you might miss a critical issue.

Gotcha #2: Don’t upgrade directly from Reef to Tentacle

You can’t upgrade directly from Reef to Tentacle — you must upgrade to Tentacle 20.2.4 from Reef. You can’t skip a version — and you can’t roll back.

Gotcha #3: Don’t skip backup before upgrading

Before upgrading to Tentacle 20.2.4, always backup your cluster — using ceph dump — so you can roll back if something goes wrong.

Gotcha #4: Don’t skip testing after upgrading

After upgrading to Tentacle 20.2.4, always test your applications — and ensure they’re still working.

Gotcha #5: Don’t skip validating your cluster’s health

After upgrading to Tentacle 20.2.4, always validate your cluster’s health — using ceph health — and check the logs.

Conclusion

Your Proxmox VE cluster is running Ceph — and you’re not alone in wondering whether you’ve patched the latest security holes. The recent Ceph security hotfixes — Tentacle 20.2.4 and Squid 19.2.6 — patch four CVEs, and Ceph Reef 18.2 is nearly fully end-of-life. If you’re still on Reef, you’re not just outdated — you’re exposed.

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Final Notes

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

Conclusion

To fix this, check your Ceph version, apply the security hotfixes — if you’re on Tentacle — and plan your upgrade path to Tentacle 20.2.4 — if you’re on Reef.

The next step? Run ceph version — and if you’re on Reef, start your upgrade plan today.

What’s Next

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using ceph health.

Test your applications — and ensure they’re still working.

If something goes wrong, you can roll back to your previous version.

You’re not alone — and you’re not too late.

Upgrade to Tentacle 20.2.4 — and protect your cluster.

If you’re still on Ceph Reef 18.2, you’re not just outdated — you’re exposed. The Ceph project has officially ended support for Reef 18.2 — and it’s nearly fully end-of-life.

Your only safe upgrade path is to Tentacle 20.2.4 — or to upgrade directly to Tentacle 20.2.4 from Reef.

If you’re on Proxmox VE 7.x or later, you can upgrade directly to Tentacle 20.2.4 — but you must plan the upgrade carefully.

Start by backing up your cluster — using ceph dump — and then check your hardware — ensure you have enough disk space and memory to run Tentacle.

Then, install Tentacle packages — use apt upgrade — and validate your cluster — using `ceph health

Written by

Proxmox Pulse

Sysadmin-driven guides for getting the most out of Proxmox VE in production and homelab environments.

Key Takeaways

How to Check Your Ceph Version on Proxmox VE

How to Apply the Ceph Security Hotfixes Safely

Step 1: Update the package list

Step 2: Upgrade Ceph packages

Step 3: Validate cluster health

How to Plan Your Reef-to-Tentacle Upgrade Path

Why Tentacle 20.2.4?

Upgrade Plan

What’s at Stake: Reef vs Tentacle

Real-World Gotchas and Experience-Based Tips

Gotcha #1: Don’t skip ceph health after upgrades

Gotcha #2: Don’t upgrade directly from Reef to Tentacle

Gotcha #3: Don’t skip backup before upgrading

Gotcha #4: Don’t skip testing after upgrading

Gotcha #5: Don’t skip validating your cluster’s health

How to Check Your Proxmox VE Cluster’s Ceph Version

How to Apply the Ceph Security Hotfixes Safely

Step 1: Update the package list

Step 2: Upgrade Ceph packages

Step 3: Validate cluster health

How to Plan Your Reef-to-Tentacle Upgrade Path

Why Tentacle 20.2.4?

Upgrade Plan

What’s at Stake: Reef vs Tentacle

Real-World Gotchas and Experience-Based Tips

Gotcha #1: Don’t skip ceph health after upgrades

Gotcha #2: Don’t upgrade directly from Reef to Tentacle

Gotcha #3: Don’t skip backup before upgrading

Gotcha #4: Don’t skip testing after upgrading

Gotcha #5: Don’t skip validating your cluster’s health

How to Check Your Proxmox VE Cluster’s Ceph Version

How to Apply the Ceph Security Hotfixes Safely

Step 1: Update the package list

Step 2: Upgrade Ceph packages

Step 3: Validate cluster health

How to Plan Your Reef-to-Tentacle Upgrade Path

Why Tentacle 20.2.4?

Upgrade Plan

What’s at Stake: Reef vs Tentacle

Real-World Gotchas and Experience-Based Tips

Gotcha #1: Don’t skip ceph health after upgrades

Gotcha #2: Don’t upgrade directly from Reef to Tentacle

Gotcha #3: Don’t skip backup before upgrading

Gotcha #4: Don’t skip testing after upgrading

Gotcha #5: Don’t skip validating your cluster’s health

Conclusion

What’s Next

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Gotcha #1: Don’t skip `ceph health` after upgrades

Gotcha #1: Don’t skip `ceph health` after upgrades

Gotcha #1: Don’t skip `ceph health` after upgrades