Proxmox web interface timeout 30 min after server boots

[w41g87]

Visiting web interface 30 min after server boots shows server times out.
Rebooting the server enables me to access web interface temporarily, and after 30 min the problem comes back.
I first checked the pve-cluster service

root@pve:/mnt# systemctl status pve-cluster
● pve-cluster.service - The Proxmox VE cluster filesystem
   Loaded: loaded (/lib/systemd/system/pve-cluster.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2019-12-25 14:55:23 EST; 52min ago
  Process: 1375 ExecStart=/usr/bin/pmxcfs (code=exited, status=0/SUCCESS)
 Main PID: 1383 (pmxcfs)
    Tasks: 7 (limit: 4915)
   Memory: 49.0M
   CGroup: /system.slice/pve-cluster.service
           └─1383 /usr/bin/pmxcfs

Dec 25 14:55:22 pve systemd[1]: Starting The Proxmox VE cluster filesystem...
Dec 25 14:55:23 pve systemd[1]: Started The Proxmox VE cluster filesystem.
Dec 25 15:38:47 pve pmxcfs[1383]: [database] crit: commit transaction failed: disk I/O error#010
Dec 25 15:38:47 pve pmxcfs[1383]: [database] crit: rollback transaction failed: cannot rollback - no transaction is active#010

Restarting pve-cluster service simply fails and when I checked the service status again it shows:

root@pve:/mnt# systemctl status pve-cluster
● pve-cluster.service - The Proxmox VE cluster filesystem
   Loaded: loaded (/lib/systemd/system/pve-cluster.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Wed 2019-12-25 15:50:39 EST; 1min 31s ago
  Process: 11006 ExecStart=/usr/bin/pmxcfs (code=exited, status=255/EXCEPTION)

Dec 25 15:50:39 pve systemd[1]: pve-cluster.service: Service RestartSec=100ms expired, scheduling restart.
Dec 25 15:50:39 pve systemd[1]: pve-cluster.service: Scheduled restart job, restart counter is at 5.
Dec 25 15:50:39 pve systemd[1]: Stopped The Proxmox VE cluster filesystem.
Dec 25 15:50:39 pve systemd[1]: pve-cluster.service: Start request repeated too quickly.
Dec 25 15:50:39 pve systemd[1]: pve-cluster.service: Failed with result 'exit-code'.
Dec 25 15:50:39 pve systemd[1]: Failed to start The Proxmox VE cluster filesystem.

 

[dietmar]

You got a disk IO Error. Please check your disks - syslog should contains additional infos...

 

[synthetic64]

I had similar problem too. In my case this was because one of the virtual machines periodically tried to get IP-address from DHCP via WiFi. WiFi router rejected those requests but eventually gave up and assigned IP-address to virtual machine therefore host-proxmox lost the connection. Try to shutdown virtual machines and watch for a while. Or temportary disable bridges at /etc/network/interfaces.