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Customizing network interface configuration in Debian/Ubuntu containers/VMs

APPLIES TO:
  • Parallels Cloud Server
  • Parallels Virtuozzo Containers for Linux
  • Parallels Server

Symptoms

Custom network interface settings specified in  /etc/network/interfaces are not applied in Debian-based containers or virtual machines.

Cause

Interface configuration in the file /etc/network/interfaces is automatically generated and all customizations are overwritten.
 
In virtual machines, the file is generated by Parallels Tools.
 
In containers, it is generated by scripts /etc/sysconfig/vz-scripts/dists/scripts/debian-add_ip.sh in routed mode and /etc/sysconfig/vz-scripts/dists/scripts/debian-add_netif.sh in bridged mode.

Resolution

To have those custom settings applied upon the interface's activation, the separate interface initialization script should be defined instead.

1. Create /etc/network/if-up.d/additional and specify custom settings there.

Example:
[root@debian.ct ~]# cat /etc/network/if-up.d/additional
#!/bin/bash -x
[ "$MODE" = "stop" -o -z "$MODE" ] && exit 0
case "$IFACE" in
eth0) ## custom commands for eth0
      ip route add mm.nn.245.0/24 via xx.yy.19.2 dev eth0
      ;;
esac
exit 0
[root@debian.ct ~]#

2. Set correct permissions on the script:
chmod 755 /etc/network/if-up.d/additional



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