Problems building a new server

[Ed_S]

You need at least 1G of swap space - do you have it?

free

will tell you.

Edit: I recommend you read
MKJ’s Opinionated Discourse Deployment Configuration
too. You have this warning which is not good on a small memory system

@danielabc

43.110 # WARNING Memory overcommit must be enabled

See the Kernel Configuration section - you need these effects, although whether it’s exactly these commands may depend on which distribution you are running:

@mcdanlj

Kernel configuration

Redis (one of the key components on which Discourse is built) strongly recommends disabling transparent huge pages, 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

Edit: you can check these two important settings on your running server like this

# cat /proc/sys/vm/overcommit_memory
1
# cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]