Clear DNS Cache in Linux

Had a slightly vexing issue the other day. During a migration the destination host ended up caching some stale DNS entries. I tried a quick restart of nscd to no avail, rebooted the VM, again no joy. Even overriding the host in /etc/hosts wasn’t working. Took a few minutes of digging but what did work was

nscd -i hosts

. Just something to remember if you ever seem to have a stubborn caching issue, rebooting/restarting wont always solve the issue.

Also happy late sysadmin day! Unfortunately I missed the festivities being stuck in the hospital. Oh well, there is always next year.

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