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  1. Moodle
  2. MDL-70691

Add support for host failover with PostgreSQL

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: 3.10.1
    • Fix Version/s: None
    • Component/s: Database SQL/XMLDB
    • Labels:
      None
    • Affected Branches:
      MOODLE_310_STABLE

      Description

      Since version 10, PostgreSQL allows to specify serveral hosts in the
      connnection string, and can, if the connection option
      target_session_atts=read-write is added, automatically choose the primary
      (writable) node in a cluster. If the primary changes (due to a failover or
      switchover), the client connection will be retried for the next host until a
      writable primary is found again.

      To leverage this, add the "dbfailover" option to dboptions. If it is set, add
      "target_session_attr=read-write" to the connection string. This, in conjunction
      with specifying several hosts in $CFG->dbhost config variable makes it possible
      to point Moodle at a high-available PostgreSQL cluster and let it follow
      failovers automatically.

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              Assignee:
              Unassigned Unassigned
              Reporter:
              mbanck mbanck
              Participants:
              Component watchers:
              Andrew Nicols, Jun Pataleta, Michael Hawkins, Shamim Rezaie, Simey Lameze
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                Dates

                Created:
                Updated: