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repmgrd: monitor standbys attached to primary

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This functionality enables repmgrd (when running on the primary) to
monitor connected child nodes. It will log connections and disconnections
and generate events.

Additionally, repmgrd can execute a custom script if the number of connected
child nodes falls below a configurable threshold. This script can be used
e.g. to "fence" the primary following a failover situation where a new primary
has been promoted and all standbys are now child nodes of that primary.
This commit is contained in:
Ian Barwick
2019-04-22 16:16:59 +09:00
parent 64c4cb81d5
commit 5a90513878
9 changed files with 917 additions and 5 deletions
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10
repmgr.conf.sample
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@@ -346,6 +346,16 @@ ssh_options='-q -o ConnectTimeout=10' # Options to append to "ssh"
# value: %n (node_id), %a (node_name). *Must* be the same on all nodes.
#election_rerun_interval=15 # if "failover_validation_command" is set, and the command returns
# an error, pause the specified amount of seconds before rerunning the election.
#
# The following items are relevant for repmgrd running on the primary,
# and will be ignored on non-primary nodes
#child_nodes_check_interval=5 # Interval (in seconds) to check for attached child nodes (standbys)
#child_nodes_connected_min_count=-1 # Minimum number of child nodes which must remain connected, otherwise
# disconnection command will be triggered
#child_nodes_disconnect_min_count=-1 # Minimum number of disconnected child nodes required to execute disconnection command
# (ignored if "child_nodes_connected_min_count" set)
#child_nodes_disconnect_timeout=30 # Interval between child node disconnection and disconnection command execution
#child_nodes_disconnect_command= # Command to execute if child node disconnection detected
#------------------------------------------------------------------------------
# service control commands