Instances Stop Randomly Due to Out of Memory Error
Problem
- Multiple instances stop randomly.
- We can see 'Out of memory' errors on the host.
- We can see 'Instance is already powered off in the hypervisor when a stop is called' messages in /var/log/pf9/ostackhost.log on the host.
- We can see below errors in /var/log/messages.log.
Environment
- Platform9 Managed OpenStack - All Versions
Cause
Kernel initiated Out Of Memory Killer (OOM Killer).
OOM Killer is a process that the Linux kernel employs when the system is critically low on memory.
As there is not enough memory on the host, the kernel has initiated the OOM killer which sacrificed the qemu/kvm process and the instances on the host have stopped.
Resolution
Add more memory on the host or increase swap if physical memory/swap space is low.
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