How to make SSHd service permanently running?

[Fli]

How to make some service like SSHd permanently running and restart it if it is stopped or dead?

If i kill SSHd (service) accidentally, i think this can help to start it (on Redhat/CentOS Linux):

vi /root/makesshrunning

paste into it:

if [[ "$(service sshd status)" != *"running"* ]];then service sshd restart;fi

chmod 700 /root/makesshrunning && echo "*/5 * * * * root /bin/sh /root/makesshrunning" >> /etc/cron.d/mycrons && chmod 600 /etc/cron.d/mycrons

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Update: i did a few adjustments to monitor LFD (firewall) too and send me log file reports via email. I renamed script file from makesshrunning to keeprunningservices:


[email protected]

# SSH
if [[ "$(service sshd status)" != *"running"* ]];then
service sshd restart
tail -n 50 /var/log/secure | mail -s "/root/keeprunningservices SSH restart" $adminmail
fi

# LFD
if [[ "$(service lfd status)" != *"running"* ]];then
service lfd restart
tail -n 50 /var/log/lfd.log | grep -v ignored | mail -s "/root/keeprunningservices LFD restart" $adminmail
fi