Hi there
The sessions are opened by a Nagios server for various tests, which
means there is always a clean exit status, otherwise the tests would not
work.
However, the same happens with sessions opened manually.
The sessions run over a ProxyCommand/JumpHost with Proxmox 8.0.3/Debian
12.1 to the VMs (All Debian 11) over the internal bridge.
Nagios -> Proxmox -> VM hosts
Since the sshd remain on the Proxmox and the VM hosts, they also eat up
all the memory over time.
On the VM host:
user@vm:~$ ps -ALf | grep nagios
[...]
root 196819 732 196819 0 1 09:17 ? 00:00:00 sshd: nagios [priv]
nagios 196825 196819 196825 0 1 09:17 ? 00:00:00 sshd: nagios@notty
[...]
user@proxmox:~# ps -ALf | grep nagios
[...]
nagios 617299 1 617299 0 1 09:17 ? 00:00:00 nc 10.0.0.80 22
nagios 617300 1 617300 0 1 09:17 ? 00:00:00 nc 10.0.0.25 22
[...]
With loginctl the sessions are still listed:
root@vm:~# loginctl
[...]
18112 6000 nagios
18113 6000 nagios
[...]
root@proxmox:~# loginctl
[...]
129729 6000 nagios
129730 6000 nagios
[...]
It even records on the proxmox that the session has been closed:
root@proxmox:~# loginctl session-status 129538
129538 - nagios (6000)
Since: Tue 2023-07-25 09:17:03 CEST; 24min ago
Leader: 617115
Remote: 84.xx.xx.xx
Service: sshd; type tty; class user
State: closing
Unit: session-129538.scope
└─617299 nc 10.0.0.80 22
Jul 25 09:17:03 proxmox systemd[1]: Started session-129538.scope -
Session 129538 of User nagios.
Jul 25 09:17:04 proxmox sshd[617273]: Received disconnect from
84.xx.xx.xx port 8152:11: disconnected by user
Jul 25 09:17:04 proxmox sshd[617273]: Disconnected from user nagios
84.xx.xx.xx port 8152
Jul 25 09:17:04 proxmox sshd[617115]: pam_unix(sshd:session): session
closed for user nagios
...in contrast on the VMs:
root@vm:~# loginctl session-status 18084
18084 - nagios (6000)
Since: Tue 2023-07-25 09:17:04 CEST; 25min ago
Leader: 196819 (sshd)
Remote: 10.0.0.11
Service: sshd; type tty; class user
State: active
Unit: session-18084.scope
├─196819 sshd: nagios [priv].
└─196825 sshd: nagios@notty
Jul 25 09:17:04 webserver systemd[1]: Started session 18084 of user nagios.
If I kill the sessions on the Proxmox/Jumphost, they also disappear on
the VMs.
The irritating thing is that this problem did not exist before with
Debian 11.7 and KVM/qemu, the VMs did not change.
Any Ideas?
BR,
Fabian
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