Do I need to restart after editing Anacrontab?

Solution 1:

In CentOS/RHEL, anacrontab is run from cron... so you don't need to do anything.

• cron.{daily, weekly, monthly} jobs are defined in /etc/anacrontab
• The anacron command executes jobs defined in /etc/anacrontab
• Anacron is called from /etc/cron.hourly/0anacron
• /etc/cron.d/0hourly contains 01 * * * * root run-parts /etc/cron.hourly

A little difficult to follow, but yeah...

Solution 2:

No. anacron isn't a separate daemon that runs continuously. It's started periodically, say daily, by a cron job, does its work, then exits. For example, on my Ubuntu host, /etc/cron.d/anacron contains

30 7    * * *   root    start -q anacron || :

So each time anacron runs, it starts up and rereads its configuration files. So your changes will take effect the next time anacron runs.