No disk usage for Proxmox QEMU VMs

Troubleshooting
,
1

CMK version: 2.4.0p10
OS version: Docker

Error message:
N/A

Output of “cmk --debug -vvn dev”:

value store: loading from disk
Checkmk version 2.4.0p10
+ FETCHING DATA
  Source: SourceInfo(hostname='dev', ipaddress='192.168.0.47', ident='piggyback', fetcher_type=<FetcherType.PIGGYBACK: 4>, source_type=<SourceType.HOST: 1>)
[cpu_tracking] Start [7fd406a88ce0]
Read from cache: NoCache(path_template=/dev/null, max_age=MaxAge(checking=0.0, discovery=0.0, inventory=0.0), simulation=False, use_only_cache=False, file_cache_mode=1)
1 piggyback files for 'dev'.
Read piggyback file '/omd/sites/cmk/tmp/check_mk/piggyback/dev/foo.com'
0 piggyback files for '192.168.0.47'.
Get piggybacked data
[cpu_tracking] Stop [7fd406a88ce0 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.010000000707805157))]
[cpu_tracking] Start [7fd406a37f50]
+ PARSE FETCHER RESULTS
<<<proxmox_ve_vm_info:cached(1757460066,90):sep(0)>>> / Transition NOOPParser -> HostSectionParser
<<<proxmox_ve_mem_usage:cached(1757460066,90):sep(0)>>> / Transition HostSectionParser -> HostSectionParser
<<<proxmox_ve_vm_backup_status:cached(1757460066,90):sep(0)>>> / Transition HostSectionParser -> HostSectionParser
<<<proxmox_ve_vm_snapshot_age:cached(1757460066,90):sep(0)>>> / Transition HostSectionParser -> HostSectionParser
<<<piggyback_source_summary:sep(0)>>> / Transition HostSectionParser -> HostSectionParser
<<<labels:sep(0)>>> / Transition HostSectionParser -> HostSectionParser
  HostKey(hostname='dev', source_type=<SourceType.HOST: 1>)  -> Add sections: ['labels', 'piggyback_source_summary', 'proxmox_ve_mem_usage', 'proxmox_ve_vm_backup_status', 'proxmox_ve_vm_info', 'proxmox_ve_vm_snapshot_age']
Received no piggyback data
Proxmox VE Memory Usage Usage: 84.28% - 13.5 GiB of 16.0 GiB (warn/crit at 80.00%/90.00% used)
Proxmox VE VM Info   VM ID: 103, Status: running, Type: qemu, Host: brain
Proxmox VE VM Snapshot age No snapshot found
[cpu_tracking] Stop [7fd406a37f50 - Snapshot(process=posix.times_result(user=0.0, system=0.0, children_user=0.0, children_system=0.0, elapsed=0.0))]
[piggyback] Successfully processed from source 'foo.com', execution time 0.0 sec | execution_time=0.010 user_time=0.000 system_time=0.000 children_user_time=0.000 children_system_time=0.000 cmk_time_agent=0.010

I don’t have the “Proxmox VE Disk Usage” in piggyback data of my VMs. I think this service is called proxmox_ve_disk_usage

Any idea why?

Thanks

2

The disk usage is only available for LXC containers. Qemu VMs don’t have this data.
You see this also inside the Proxmox GUI, like here in this screenshot.

image
image1050×172 25.5 KB

2 Likes
3

Thanks that makes sense. I guess in such case it’s better to install the agent on each VM.

1 Like
4

I looked a bit more at it and I found a way to retrieve more info of QEMU VMs. If the VM has QEMU Guest Agent installed we could then use qm guest cmd <id> get-fsinfo.

Looks like this in my case:

[
   {
      "disk" : [
         {
            "bus" : 0,
            "bus-type" : "scsi",
            "pci-controller" : {
               "bus" : 0,
               "domain" : 0,
               "function" : 0,
               "slot" : 5
            },
            "target" : 0,
            "unit" : 0
         }
      ],
      "mountpoint" : "/boot",
      "name" : "sda1",
      "total-bytes" : 88422400,
      "total-bytes-privileged" : 95762432,
      "type" : "ext4",
      "used-bytes" : 26929152
   },
   {
      "disk" : [
         {
            "bus" : 0,
            "bus-type" : "scsi",
            "pci-controller" : {
               "bus" : 0,
               "domain" : 0,
               "function" : 0,
               "slot" : 5
            },
            "target" : 0,
            "unit" : 0
         }
      ],
      "mountpoint" : "/",
      "name" : "sda3",
      "total-bytes" : 63026442240,
      "total-bytes-privileged" : 66422804480,
      "type" : "ext4",
      "used-bytes" : 22340747264
   }
]

Do you think this could be added to piggyback data?

There is also get-osinfo that could be useful qm guest cmd 103 get-osinfo:

{
   "id" : "alpine",
   "kernel-release" : "6.12.41-0-virt",
   "kernel-version" : "#1-Alpine SMP PREEMPT_DYNAMIC 2025-08-07 06:15:54",
   "machine" : "x86_64",
   "name" : "Alpine Linux",
   "pretty-name" : "Alpine Linux v3.22",
   "version-id" : "3.22.1"
}

And info returns the supported commands if others are useful:

{
   "supported_commands" : [
      {
         "enabled" : true,
         "name" : "guest-network-get-route",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-load",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-cpustats",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-diskstats",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-ssh-remove-authorized-keys",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-ssh-add-authorized-keys",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-ssh-get-authorized-keys",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-osinfo",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-timezone",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-users",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-host-name",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-exec",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-exec-status",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-memory-block-info",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-set-memory-blocks",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-memory-blocks",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-set-user-password",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-fsinfo",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-set-vcpus",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-vcpus",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-network-get-interfaces",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-suspend-hybrid",
         "success-response" : false
      },
      {
         "enabled" : true,
         "name" : "guest-suspend-ram",
         "success-response" : false
      },
      {
         "enabled" : true,
         "name" : "guest-suspend-disk",
         "success-response" : false
      },
      {
         "enabled" : true,
         "name" : "guest-fstrim",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-fsfreeze-thaw",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-fsfreeze-freeze-list",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-fsfreeze-freeze",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-fsfreeze-status",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-file-flush",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-file-seek",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-file-write",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-file-read",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-file-close",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-file-open",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-shutdown",
         "success-response" : false
      },
      {
         "enabled" : true,
         "name" : "guest-info",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-set-time",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-get-time",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-ping",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-sync",
         "success-response" : true
      },
      {
         "enabled" : true,
         "name" : "guest-sync-delimited",
         "success-response" : true
      }
   ],
   "version" : "10.0.0"
}