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Update README with better two-node example output

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Greg Smith
2011-02-23 09:08:08 -05:00
parent 3cdd6a57fd
commit 59b7b90169
3 changed files with 23 additions and 11 deletions
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26
README.rst
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@@ -707,10 +707,19 @@ Register the standby by typing on "node2"::
At this point, you have a functioning primary on "node1" and a functioning At this point, you have a functioning primary on "node1" and a functioning
standby server running on "node2". You can confirm the master knows standby server running on "node2". You can confirm the master knows
about the standby, and that it is keeping it current, by running the about the standby, and that it is keeping it current, by looking at
following on the master:: ``repl_status``::
psql -x -d pgbench -c "SELECT * FROM repmgr_test.repl_status" postgres@node2 $ psql -x -d pgbench -c "SELECT * FROM repmgr_test.repl_status"
-[ RECORD 1 ]-------------+------------------------------
primary_node | 1
standby_node | 2
last_monitor_time | 2011-02-23 08:19:39.791974-05
last_wal_primary_location | 0/1902D5E0
last_wal_standby_location | 0/1902D5E0
replication_lag | 0 bytes
apply_lag | 0 bytes
time_lag | 00:26:13.30293
Some tests you might do at this point include: Some tests you might do at this point include:
@@ -726,7 +735,9 @@ Simulating the failure of the primary server
To simulate the loss of the primary server, simply stop the "node1" server. To simulate the loss of the primary server, simply stop the "node1" server.
At this point, the standby contains the database as it existed at the time of At this point, the standby contains the database as it existed at the time of
the "failure" of the primary server. the "failure" of the primary server. If looking at ``repl_status`` on
"node2", you should see the time_lag value increase the longer "node1"
is down.
Promoting the Standby to be the Primary Promoting the Standby to be the Primary
--------------------------------------- ---------------------------------------
@@ -742,11 +753,12 @@ Bringing the former Primary up as a Standby
------------------------------------------- -------------------------------------------
To make the former primary act as a standby, which is necessary before To make the former primary act as a standby, which is necessary before
restoring the original roles, type:: restoring the original roles, type the following on node1::
repmgr -U postgres -R postgres -h node1 -p 5432 -d pgbench --force --verbose standby clone repmgr -D $PGDATA -d pgbench -p 5432 -U repmgr -R postgres --verbose --force standby clone node2
Stop and restart the "node1" server, which is now acting as a standby server. Then start the "node1" server, which is now acting as a standby server.
Check
Make sure the record(s) inserted the earlier step are still available on the Make sure the record(s) inserted the earlier step are still available on the
now standby (prime). Confirm the database on "node1" is read-only. now standby (prime). Confirm the database on "node1" is read-only.

4
dbutils.c
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@@ -257,8 +257,8 @@ getMasterConnection(PGconn *standby_conn, int id, char *cluster,
/* initialize with the values of the current node being processed */ /* initialize with the values of the current node being processed */
*master_id = atoi(PQgetvalue(res1, i, 0)); *master_id = atoi(PQgetvalue(res1, i, 0));
strncpy(master_conninfo, PQgetvalue(res1, i, 2), MAXCONNINFO); strncpy(master_conninfo, PQgetvalue(res1, i, 2), MAXCONNINFO);
log_info(_("checking role of cluster '%s'\n"), log_info(_("checking role of cluster '%s'\n"),
master_conninfo); master_conninfo);
master_conn = establishDBConnection(master_conninfo, false); master_conn = establishDBConnection(master_conninfo, false);
if (PQstatus(master_conn) != CONNECTION_OK) if (PQstatus(master_conn) != CONNECTION_OK)

4
repmgr.c
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@@ -525,7 +525,7 @@ do_standby_register(void)
log_info(_("%s connecting to standby database\n"), progname); log_info(_("%s connecting to standby database\n"), progname);
conn = establishDBConnection(options.conninfo, true); conn = establishDBConnection(options.conninfo, true);
/* should be v9 or better */ /* should be v9 or better */
log_info(_("%s connected to standby, checking its state\n"), progname); log_info(_("%s connected to standby, checking its state\n"), progname);
pg_version(conn, standby_version); pg_version(conn, standby_version);
@@ -1128,7 +1128,7 @@ do_standby_promote(void)
log_err("There is a master already in this cluster\n"); log_err("There is a master already in this cluster\n");
exit(ERR_BAD_CONFIG); exit(ERR_BAD_CONFIG);
} }
log_notice(_("%s: Promoting standby\n"), progname); log_notice(_("%s: Promoting standby\n"), progname);
/* Get the data directory full path and the last subdirectory */ /* Get the data directory full path and the last subdirectory */