Checks After Failover Setup

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Revision as of 10:13, 3 November 2017 by MCoyne (talk | contribs) (Check)

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Check Email is Flowing

On (all) the scanner(s) run the following:

  tail -f /var/log/mail-daily/current.log

It should be obvious if mail is flowing.

Checking WAL File Streaming

You can check if WAL data is streaming by running on the primary this command:

   watch -d 'ps auxww|grep [s]treaming'

You will see something like this:

 postgres 25972  0.2  0.1 103012  4912 ? Ss 15:24 0:09 postgres: wal sender process postgres streaming 26E/6A01AEF0

Where the last few hex digits will be changing if things are okay. (They will change fast on a busy system and possibly very slowly on a lightly-loaded one.)


On the backup database run:

  watch -d 'ps auxww| grep "[p]ostgres: startup"'

You should see something like:

  postgres 39942  0.0  0.6 101408 27488 ? Ss 15:23 0:02 postgres: startup process   recovering 000000070000026E0000006A

Where the last few digits change over very slowly over several minutes. This shows WAL files being consumed.