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Initial switchover implementation

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The repmgr3 implementation required the promotion candidate (standby)
to directly work with the demotion candidate's data directory,
directly execute server control commands etc.

Here we delegated a lot more of that work to the repmgr on the
demotion candidate, which reduces the amount of back-and-forth
over SSH and generally makes things cleaner and smoother.

In particular the repmgr on the demotion candidate will carry
out a thorough check that the node is shut down and report
the last checkpoint LSN to the promotion candidate; this
can then be used to determine whether pg_rewind needs to be
executed on the demoted primary before reintegrating it back
into the cluster (todo).

Also implement "--dry-run" for this action, which will sanity-check the
nodes as far as possible without executing the switchover.

Additionally some of the new repmgr node commands (or command options)
introduced for this can be also executed by the user to obtain
additional information about the status of each node.
This commit is contained in:
Ian Barwick
2017-08-03 16:38:37 +09:00
parent c67aa15581
commit 112ca6321a
15 changed files with 1024 additions and 102 deletions
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42
repmgr-client.h
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@@ -48,21 +48,23 @@
#define OPT_WITHOUT_BARMAN 12
#define OPT_NO_UPSTREAM_CONNECTION 13
#define OPT_REGISTER_WAIT 14
#define OPT_CLUSTER 15
#define OPT_LOG_TO_FILE 16
#define OPT_UPSTREAM_CONNINFO 17
#define OPT_LOG_TO_FILE 15
#define OPT_UPSTREAM_CONNINFO 16
/* replaces --no-conninfo-password */
#define OPT_USE_RECOVERY_CONNINFO_PASSWORD 18
#define OPT_REPLICATION_USER 19
#define OPT_EVENT 20
#define OPT_LIMIT 21
#define OPT_ALL 22
#define OPT_DRY_RUN 23
#define OPT_UPSTREAM_NODE_ID 24
#define OPT_ACTION 25
#define OPT_USE_RECOVERY_CONNINFO_PASSWORD 17
#define OPT_REPLICATION_USER 18
#define OPT_EVENT 19
#define OPT_LIMIT 20
#define OPT_ALL 21
#define OPT_DRY_RUN 22
#define OPT_UPSTREAM_NODE_ID 23
#define OPT_ACTION 24
#define OPT_LIST_ACTIONS 25
#define OPT_CHECK 26
#define OPT_LIST 27
#define OPT_CHECKPOINT 27
#define OPT_IS_SHUTDOWN 28
#define OPT_ALWAYS_PROMOTE 29
#define OPT_FORCE_REWIND 30
/* deprecated since 3.3 */
#define OPT_DATA_DIR 998
#define OPT_NO_CONNINFO_PASSWORD 999
@@ -97,7 +99,7 @@ static struct option long_options[] =
/* logging options */
{"log-level", required_argument, NULL, 'L'},
{"log-to-file", no_argument, NULL, OPT_LOG_TO_FILE},
{"terse", required_argument, NULL, 't'},
{"terse", no_argument, NULL, 't'},
{"verbose", no_argument, NULL, 'v'},
/* output options */
@@ -118,10 +120,19 @@ static struct option long_options[] =
/* "standby register" options */
{"wait-sync", optional_argument, NULL, OPT_REGISTER_WAIT},
/* "standby switchover" options */
{"remote-config-file", required_argument, NULL, 'C'},
{"always-promote", no_argument, NULL, OPT_ALWAYS_PROMOTE },
{"force-rewind", no_argument, NULL, OPT_FORCE_REWIND },
/* "node status" options */
{"is-shutdown", no_argument, NULL, OPT_IS_SHUTDOWN },
/* "node service" options */
{"action", required_argument, NULL, OPT_ACTION},
{"check", no_argument, NULL, OPT_CHECK},
{"list", no_argument, NULL, OPT_LIST},
{"list-actions", no_argument, NULL, OPT_LIST_ACTIONS},
{"checkpoint", no_argument, NULL, OPT_CHECKPOINT},
/* "cluster event" options */
{"all", no_argument, NULL, OPT_ALL },
@@ -139,7 +150,6 @@ static struct option long_options[] =
/* not yet handled */
{"keep-history", required_argument, NULL, 'k'},
{"mode", required_argument, NULL, 'm'},
{"remote-config-file", required_argument, NULL, 'C'},
{"check-upstream-config", no_argument, NULL, OPT_CHECK_UPSTREAM_CONFIG},
{"pg_rewind", optional_argument, NULL, OPT_PG_REWIND},
{"pwprompt", optional_argument, NULL, OPT_PWPROMPT},