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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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9
configfile.h
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@@ -148,6 +148,11 @@ typedef struct
bool primary_visibility_consensus;
char failover_validation_command[MAXPGPATH];
int election_rerun_interval;
int child_nodes_check_interval;
int child_nodes_disconnect_min_count;
int child_nodes_connected_min_count;
int child_nodes_disconnect_timeout;
char child_nodes_disconnect_command[MAXPGPATH];
/* BDR settings */
bool bdr_local_monitoring_only;
@@ -221,6 +226,10 @@ typedef struct
DEFAULT_PRIMARY_NOTIFICATION_TIMEOUT, \
-1, "", false, DEFAULT_SIBLING_NODES_DISCONNECT_TIMEOUT, \
CHECK_PING, true, "", DEFAULT_ELECTION_RERUN_INTERVAL, \
DEFAULT_CHILD_NODES_CHECK_INTERVAL, \
DEFAULT_CHILD_NODES_DISCONNECT_MIN_COUNT, \
DEFAULT_CHILD_NODES_CONNECTED_MIN_COUNT, \
DEFAULT_CHILD_NODES_DISCONNECT_TIMEOUT, "", \
/* BDR settings */ \
false, DEFAULT_BDR_RECOVERY_TIMEOUT, \
/* service settings */ \