Ian Barwick 120688013e Add "standby switchover" mode ...

Perform a switchover by:
 - stopping current primary node
 - promoting this standby node to primary
 - forcing previous primary node to follow this node

Caveats:
 - repmgrd must not be running, otherwise it may
   attempt a failover
   (TODO: find some way of notifying repmgrd of planned
    activity like this)
 - currently only set up for two-node operation; any other
   standbys will probably become downstream cascaded standbys
   of the old primary once it's restarted
 - as we're executing repmgr remotely (on the old primary),
   we'll need the location of its configuration file; this
   can be provided explicitly with -C/--remote-config-file,
   otherwise repmgr will look in default locations on the
   remote server
 - this does not yet support "rewinding" stopped nodes
   which will be unable to catch up with the primary

TODO:
 - update help, docs
 - make connection test timeouts/intervals configurable

2015-11-30 12:20:24 +09:00

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