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I want to run this command at the startup since my system keeps resetting the hostname to "ubuntu" upon startup.
I tried adding it to crontab under "@reboot hostname mysite.com" and it would not work, it would work if i set cron to "* * * * * hostname mysite.com" but that means I have wait 1 minute after machine boots plus, it keeps running every minute on a schedule which is not good practice.
To change the hostname permanently you have to edit the file /etc/hostname and write the new hostname then run
then you can also edit /etc/hosts and /etc/resolv.conf to change the hostname and the domain name accordingly. If for some reason it doesn't work (in that case you have to investigate the reasons) you can try to add the command to /etc/init.d/rc.local.