I have a problem with postgres not being able to start:
Can someone suggest what can be the problem?
I used following commands to stop/start the postgres server on Ubuntu 14.04 with postgres 9.5:
sudo service postgresql stop sudo service postgresql start
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As the error message indicates, you appear to not have enough available memory to start the service. You can check your available memory at any time by running the command:
free -m
When you see this error, aside from the suggestions for optimizations presented by the error message you can also add a swap file and/or upgrade to a larger droplet in order to have more memory+swap available for the PostgreSQL process.