How to do an automatic server reboot?

Question

linux

Is there a tool to automatically reboot the server if the server crashes? I'm interested in the stability of the site on vps.

Answer 1

Read about monit, it will solve your problem.

Answer 2

In general, there should be such tools at the hypervisor level. However, they are unlikely to be available from inside the vps container. I have not met hosters that would provide an API to this mechanism on the hypervisor. Probably not for security reasons.
If you have access to a hypervisor (for example, you rent a physical server where you deployed a VPS), then you need to know which hypervisor you have.
And so you can monitor individual services on the VPS and restart them as needed using self-written scripts or specials. Software (for example, Zabbix). Of course, if the entire VPS "dies", this will not save the situation.

Answer 3

Your approach is on the wrong side. Failures should be monitored and the causes of the failure eliminated.

Answer 4

If a failure is understood as kernel panic, then you can add the line to /etc/sysctl.conf:
kernel.panic = 3
then after kernel panic the system will automatically reboot after 3 seconds.
In other cases, it is necessary to monitor each service / daemon separately and already hang some handler on this monitoring.

Answer 5

Depending on what is meant by failure. Sometimes it's better not to reboot the machine. Because it can do more damage.