Follow the below mentioned steps to clear the local DNS cache in Linux Server:

1. Open your terminal to use the command line.

2. Log in as root user using the su command:

[email protected]:~$ su
Password: (type your root user password here)
[email protected]:

3. Restart the name service cache daemon (NSCD):

[email protected]: /etc/init.d/nscd restart

Note: The Name Service Cache Daemon (NSCD) might not be installed by default on your Linux. You must be able to install it by using the package manager of your distribution – yum for RedHat-based distribution such as Fedora, CentOS and apt-get for Debian-based distribution such as Ubuntu, Kubuntu.

More about Linux Server: How to Reboot a Linux Server using Command Line