Postgres stopped running, is there a way I can get alerts if this happens?

August 19, 2017 2.5k views
PostgreSQL Monitoring Ubuntu 16.04
rysilva
By:
rysilva

I recently realized my site was down, and after I checked the logs I noticed I couldn't connect to postgres. Once I started postgres the site was back up.

Couple of questions:

  • What might cause postgres to stop?
  • What's a way that I could get an alert if my site goes down?
Log In to Comment
1 Answer
Aprexer August 19, 2017

Then you would need to check postgres logs to find out why it crashes.

Reply
  • rysilva August 20, 2017

    Looks like it ran out of memory.

    2017-08-16 15:37:13 UTC [1614-2] LOG:  received fast shutdown request
2017-08-16 15:37:13 UTC [1614-3] LOG:  aborting any active transactions
2017-08-16 15:37:13 UTC [1640-2] LOG:  autovacuum launcher shutting down
2017-08-16 15:37:13 UTC [1637-1] LOG:  shutting down
2017-08-16 15:37:13 UTC [1637-2] LOG:  database system is shut down
2017-08-16 15:37:15 UTC [31373-1] FATAL:  could not map anonymous shared memory: Cannot allocate memory
2017-08-16 15:37:15 UTC [31373-2] HINT:  This error usually means that PostgreSQL's request for a shared memory segment exceeded available memory, swap space, or huge pages. To reduce the request size (currently 148488192 bytes), reduce PostgreSQL's shared memory usage, perhaps by reducing shared_buffers or max_connections.
    • Aprexer August 20, 2017

      Google your error and it will give you the solution.

      • rysilva August 20, 2017

        I didn't have any trouble starting postgres and I haven't had any issues in the past, so I'm not sure whether there's actually anything to resolve.

        • Aprexer August 20, 2017

          Postgres running out memory is a sign you're not allocating enough memory to it. If you don't resolve it now, it will happen in the future specially when more people use your site.

Have another answer? Share your knowledge.

Related Questions