[SOLVED] how to pin unpin a specific kernel?


Jan 31, 2022
Chicago, IL
I have just updated to latest version and newest kernel and I have noticed intermittent internet connections on PVE and VM's

proxmox-ve: 7.2-1 (running kernel: 5.15.35-3-pve)
pve-manager: 7.2-5 (running version: 7.2-5/12f1e639)
pve-kernel-5.15: 7.2-5
pve-kernel-helper: 7.2-5
pve-kernel-5.13: 7.1-9
pve-kernel-5.4: 6.4-11
pve-kernel-5.15.35-3-pve: 5.15.35-6
pve-kernel-5.15.35-2-pve: 5.15.35-5
pve-kernel-5.13.19-6-pve: 5.13.19-15
pve-kernel-5.13.19-2-pve: 5.13.19-4
pve-kernel-5.4.157-1-pve: 5.4.157-1
pve-kernel-5.4.73-1-pve: 5.4.73-1
ceph-fuse: 16.2.9-pve1
corosync: 3.1.5-pve2
criu: 3.15-1+pve-1
glusterfs-client: 9.2-1
ifupdown: 0.8.36+pve1
ifupdown2: not correctly installed
ksm-control-daemon: 1.4-1
libjs-extjs: 7.0.0-1
libknet1: 1.24-pve1
libproxmox-acme-perl: 1.4.2
libproxmox-backup-qemu0: 1.3.1-1
libpve-access-control: 7.2-2
libpve-apiclient-perl: 3.2-1
libpve-common-perl: 7.2-2
libpve-guest-common-perl: 4.1-2
libpve-http-server-perl: 4.1-2
libpve-storage-perl: 7.2-5
libqb0: 1.0.5-1
libspice-server1: 0.14.3-2.1
lvm2: 2.03.11-2.1
lxc-pve: 4.0.12-1
lxcfs: 4.0.12-pve1
novnc-pve: 1.3.0-3
proxmox-backup-client: 2.2.3-1
proxmox-backup-file-restore: 2.2.3-1
proxmox-mini-journalreader: 1.3-1
proxmox-widget-toolkit: 3.5.1
pve-cluster: 7.2-1
pve-container: 4.2-1
pve-docs: 7.2-2
pve-edk2-firmware: 3.20210831-2
pve-firewall: 4.2-5
pve-firmware: 3.4-2
pve-ha-manager: 3.3-4
pve-i18n: 2.7-2
pve-qemu-kvm: 6.2.0-10
pve-xtermjs: 4.16.0-1
qemu-server: 7.2-3
smartmontools: 7.2-pve3
spiceterm: 3.2-2
swtpm: 0.7.1~bpo11+1
vncterm: 1.7-1
zfsutils-linux: 2.1.4-pve1

so I was wanting to try and pin to the pervious version to see if that may be the issue.
if I do pin and it;s not the issue - then how can I revert the changes back to the newest version again

so pin older kernel ?
revert back to newest kernel ?

thanks for you help in advance


Jan 31, 2022
Chicago, IL
ok i search prior and did not find any relevant info but re-did my search terms and like magic I found the answers :)
thanks for the forums.

you can pin with proxmox-boot-tool kernel pin 5.15.35-2-pve enter the correct kernel version you want to pin
if your not happy with it then You can unpin with proxmox-boot-tool kernel unpin

also found the correct commands toward the bottom of the Wiki Page Here

Override the Kernel-Version for next Boot​

To select a kernel that is not currently the default kernel, you can either:
  • use the boot loader menu that is displayed at the beginning of the boot process
  • use the proxmox-boot-tool to pin the system to a kernel version either once or permanently (until pin is reset).
This should help you work around incompatibilities between a newer kernel version and the hardware.
Such a pin should be removed as soon as possible so that all current security patches of the latest kernel are also applied to the system.
For example: To permanently select the version 5.15.30-1-pve for booting you would run:
# proxmox-boot-tool kernel pin 5.15.30-1-pve
The pinning functionality works for all Proxmox VE systems, not only those using proxmox-boot-tool to synchronize the contents of the ESPs, if your system does not use proxmox-boot-tool for synchronizing you can also skip the proxmox-boot-tool refresh call in the end.
You can also set a kernel version to be booted on the next system boot only. This is for example useful to test if an updated kernel has resolved an issue, which caused you to pin a version in the first place:
# proxmox-boot-tool kernel pin 5.15.30-1-pve --next-boot
To remove any pinned version configuration use the unpin subcommand:
# proxmox-boot-tool kernel unpin
While unpin has a --next-boot option as well, it is used to clear a pinned version set with --next-boot. As that happens already automatically on boot, invonking it manually is of little use.
After setting, or clearing pinned versions you also need to synchronize the content and configuration on the ESPs by running the refresh subcommand.
You will be prompted to automatically do for proxmox-boot-tool managed systems if you call the tool interactively.
# proxmox-boot-tool refresh

thanks again for the great docs from Proxmox Team :)
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