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Add "standby switchover" mode

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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
This commit is contained in:
Ian Barwick
2015-11-25 16:25:15 +09:00
parent f6d1db5edb
commit 120688013e
6 changed files with 1079 additions and 184 deletions
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15
repmgr.h
View File

@@ -73,21 +73,30 @@ typedef struct
bool rsync_only;
bool fast_checkpoint;
bool ignore_external_config_files;
char pg_ctl_mode[MAXLEN];
char masterport[MAXLEN];
char localport[MAXLEN];
/*
* configuration file parameters which can be overridden on the
* command line
*/
char loglevel[MAXLEN];
/* parameter used by STANDBY SWITCHOVER */
char remote_config_file[MAXLEN];
/* parameter used by CLUSTER CLEANUP */
int keep_history;
char pg_bindir[MAXLEN];
char recovery_min_apply_delay[MAXLEN];
/* deprecated command line option */
char localport[MAXLEN];
} t_runtime_options;
#define T_RUNTIME_OPTIONS_INITIALIZER { "", "", "", "", "", "", "", DEFAULT_WAL_KEEP_SEGMENTS, false, false, false, false, false, false, false, false, false, "", "", "", 0, "", "" }
#define T_RUNTIME_OPTIONS_INITIALIZER { "", "", "", "", "", "", "", DEFAULT_WAL_KEEP_SEGMENTS, false, false, false, false, false, false, false, false, false, "smart", "", "", "", 0, "", "", "" }
extern char repmgr_schema[MAXLEN];
extern bool config_file_found;
#endif