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It is impossible to log into container after repair

APPLIES TO:
  • Parallels Cloud Server 6.0
  • Parallels Virtuozzo Containers for Linux
  • Parallels Server
  • Parallels Virtual Automation

Symptoms

It is impossible to log into a container after repair mode was initiated through Parallels Virtual Automation Power Panel: Management > Maintenance > Repair Mode.

SSH attempt returns following error:

ssh_exchange_identification: Connection closed by remote host

Fail counters (last column) are present in temporary container's (ID 10000000) user_beancounters file:

[root@pvcfl~]# awk '$6>0' /proc/bc/10000000/resources
         numothersock                   80                   80                   80                   80                  684

Normally last column should be equal to 0 - it would mean that usage of this resource is not reaching the limit. If the amount of failcounters is >0, that would mean the container is lacking this resource, and container's memory limits should be reconsidered.

Cause

numtcpsock and numothersock limits are insufficient, they are defined in /var/opt/pva/agent/etc/repair/repairve.conf:

[root@pvcfl ~]# grep SOCK= /var/opt/pva/agent/etc/repair/repairve.conf
NUMTCPSOCK="80:80"
NUMOTHERSOCK="80:80"

Resolution

These parameters were increased by default since PVA 6.0 Update 2. If your host is compatible with PVA 6.0 - please update your PVA Agent:

~# pva-setup --install

If you are not planning to update PVA Agent right now, or if your host is not compatible with version 6.0 - you may increase these limits up to 400 in the configuration file:

[root@pvcfl ~]# grep SOCK= /var/opt/pva/agent/etc/repair/repairve.conf
NUMTCPSOCK="400:400"
NUMOTHERSOCK="400:400" 

Search words:

unreachable

container

ssh_exchange_identification: Connection closed by remote host

repair

broken




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