Symptoms
When I login to Parallels Plesk Panel installed inside Virtuozzo container I am getting Plesk diagnostics page.Cause
The issue is caused by the fact that fully qualified domain name (FQDN) of the container can be not resolved to IP by the service container.To verify it run this command on the node:
vzctl exec 1 nslookup server.domain.tld
where server.domain.tld is FQDN of the container.
Resolution
To fix the issue make sure that the service container has DNS servers configured in IP configuration of its network adapter and is able to reach the DNS servers.The most often misconfiguration is that the service container has automatically assigned IP which is not routed to subnet where DNS servers resided.
To fix the issue it is necessary to enable NAT on the service container by using this command:
vzctl set 1 --nat on --save