Change DNS Servers on Linux Host

Problem

• The nameserver IPs need to be modified on Linux host.
• Need to change the IP to the DNS resolvers.

Environment

• Platform9 Managed OpenStack - v3.6.0 and Higher
• CentOS 7.x
• Ubuntu 16.04

Procedure

CentOS 7.x

1. Modify the value to the directive nameserver in /etc/resolv.conf.

Note: Restart of network or services is not needed.

Ubuntu 16.04

1. Add/modify the directive dns-servers in /etc/network/interfaces.
2. Reload the network configuration.

# ifdown -a && ifup -a