Discourse Fails to update in the Admin UI - No matter what

[Ed_S]

@jdc20181

Here you go. Reproduced Today.

Certainly looks like a shortage of virtual memory, which means adding swap should solve it.

But see also

@mcdanlj

Kernel configuration

Redis (one of the key components on which Discourse is built) strongly recommends disabling transparent huge pages when using on-disk persistence (which Discourse does), and I also allow memory overcommit.

echo 'sys.kernel.mm.transparent_hugepage.enabled=never' > /etc/sysctl.d/10-huge-pages.conf
echo 'vm.overcommit_memory=1' > /etc/sysctl.d/90-vm_overcommit_memory.conf
sysctl --system

I never quite gave myself the time to do the controlled experiments, but I very much believe that once you’ve set overcommit you will need less swap.