流复制环境中重启主库后报错WAL被removed的解决方法

流复制环境中重启主库后报错WAL被removed的解决方法
[postgres@db1 testspace]$ /usr/local/pgsql/bin/pg_ctl -D ./pgdb -o "--ssha_role=primary" start
server starting
[postgres@db1 testspace]$ LOG:  database system was shut down at 2017-05-31 10:54:57 CST
LOG:  MultiXact member wraparound protections are now enabled
LOG:  autovacuum launcher started
LOG:  database system is ready to accept connections


[postgres@db1 testspace]$ ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
ERROR:  requested WAL segment 00000001000000000000000B has already been removed
LOG:  received fast shutdown request
LOG:  aborting any active transactions
LOG:  autovacuum launcher shutting down

修改postgresql.conf中的参数wal_keep_segments为10（默认为0）
然后reload使参数生效

[postgres@db1 pgdb]$ /usr/local/pgsql/bin/pg_ctl reload -D /home/postgres/testspace/pgdb/
server signaled
LOG:  received SIGHUP, reloading configuration files
[postgres@db1 pgdb]$ LOG:  parameter "wal_keep_segments" changed to "10"

[postgres@db1 pgdb]$ /usr/local/pgsql/bin/psql -d postgres
psql (9.6.2)
Type "help" for help.


postgres=# show wal_keep_segments;
 wal_keep_segments 
-------------------
 10
(1 row)

[postgres@db1 testspace]$ /usr/local/pgsql/bin/pg_ctl -D ./pgdb -o "--ssha_role=primary" stop
waiting for server to shut down...LOG:  received fast shutdown request
.LOG:  aborting any active transactions
LOG:  autovacuum launcher shutting down
FATAL:  terminating connection due to administrator command
LOG:  shutting down
LOG:  database system is shut down
 done
server stopped
[postgres@db1 testspace]$ /usr/local/pgsql/bin/pg_ctl -D ./pgdb -o "--ssha_role=primary" start
server starting
[postgres@db1 testspace]$ LOG:  database system was shut down at 2017-05-31 11:37:46 CST
LOG:  MultiXact member wraparound protections are now enabled
LOG:  autovacuum launcher started
LOG:  database system is ready to accept connections

[postgres@db1 testspace]$ /usr/local/pgsql/bin/psql -d postgres
psql (9.6.2)
Type "help" for help.

postgres=# 
postgres=# select * from test;
 id 
----
  1
  2
  3
  4
  5
  6
  7
(7 rows)


postgres=# insert into test values (8);
INSERT 0 1
postgres=#