Skytools安装配置管理（六）_sql

概述子节点接管root节点，如下： [postgres@londiste1 londiste3]$ londiste3 db2.ini takeover node1 2013-09-21 10:22:13,158 25616 INFO old: node1 2013-09-21 10:22:13,197 25616 INFO [node1] Consumer londiste_db1 tagged a

子节点接管root节点，如下：

[postgres@londiste1 londiste3]$ londiste3 db2.ini takeover node1

2013-09-21 10:22:13,158 25616 INFO old: node1

2013-09-21 10:22:22,224 25616 INFO Consumer 'londiste_db1' on node 'node1' paused

2013-09-21 10:22:23,260 25616 INFO [node2] Consumer londiste_db2 tagged as paused

2013-09-21 10:22:24,273 25616 INFO Consumer 'londiste_db2' on node 'node2' paused

2013-09-21 10:22:25,338 25616 INFO Consumer 'londiste_db2' on node 'node2' resumed

2013-09-21 10:22:26,363 25616 INFO Consumer 'londiste_db1' on node 'node1' resumed

[postgres@londiste1 londiste3]$ londiste3 db1.ini status

Queue: replika Local node: node1

node2 (root)

| tables:1/0/0

| Lag:8s,Tick: 463

+--:node4 (branch)

+--:node1 (branch)

+--:node3 (branch)

+--:node5 (branch)

tables:1/0/0

Lag:8s,Simsun;Font-size:14px;vertical-align:baseline;">{此时，接管节点成为root节点，远root节点变为node2的子节点，且原来与node2同级的节点也变为node2的子节点}

3.2、walmgr3常用命令

【2.5节中包括的此处不再累赘说明】

@[email protected] MASTER COMMANDS

1.列举当前备份命令(Listbackups)：

[postgres@db1 pg93]$ walmgr3 wal-master.ini Listbackups

2.对wal进行一次手动同步命令(sync)：

[postgres@db1 pg93]$ walmgr3 wal-master.ini sync

2013-12-23 21:44:32,280 22317 INFO 000000030000000000000030.00000028.backup: last complete

2013-12-23 21:44:33,310 22317 INFO Syncing /opt/pg93/data/pg_xlog/000000030000000000000033

2013-12-23 21:44:34,595 22317 INFO Syncing /opt/pg93/data/pg_xlog/000000030000000000000035

2013-12-23 21:44:35,057 22317 INFO Partial copy done

3.启动定时同步命令(syncdaemon)：

【同步间隔时间为配置文件中loop_delay参数指定】

[postgres@db1 pg93]$ walmgr3 wal-master.ini syncdaemon

2013-12-23 21:54:12,574 22473 INFO 000000030000000000000033: last complete

2013-12-23 21:54:13,148 22473 INFO Syncing /opt/pg93/data/pg_xlog/000000030000000000000036

2013-12-23 21:54:23,990 22473 INFO 000000030000000000000033: last complete

2013-12-23 21:54:24,155 22473 INFO Syncing /opt/pg93/data/pg_xlog/000000030000000000000035

4.取消archive配置命令(stop)：

【执行后archive_command参数配置将取消】

[postgres@db1 pg93]$ walmgr3 wal-master.ini stop

2013-12-23 21:57:25,488 22524 INFO disabling WAL archiving

5.自定义定期任务命令(periodic)：

[postgres@db1 pg93]$ walmgr3 wal-master.ini periodic

该命令仅在配置文件中制定了定期执行命令（periodic_command）时有效。可以指定任何脚本，如同步、配置文件、系统定时任务crontab脚本等。

3.2.2 SLAVE COMMANDS

[postgres@db2pg93]$ walmgr3 wal-slave.ini Listbackups

List of backups:

Backup set Timestamp Label First WAL

--------------- ------------------------ ----------- ------------------------

data.master 2013-12-23 21:45:30 EST FullBackup 000000030000000000000032

2.暂停wal重放命令(pause)：

[postgres@db2pg93]$ walmgr3 wal-slave.ini pause

2013-12-23 22:14:47,210 4139 INFO Pausing recovery mode

3.继续wal重放命令(continue)：

[postgres@db2pg93]$ walmgr3 wal-slave.ini continue

2013-12-23 22:15:21,740 4149 INFO Continuing with recovery

4. 停止恢复模式命令(boot)：

【slave将变为可读写模式】

[postgres@db2pg93]$ walmgr3 wal-slave.ini boot

2013-12-23 22:17:27,412 4164 INFO StopPing recovery mode

5.创建一个slave节点(createslave)：

【该命令使子节点的创建过程更加简单】

[postgres@db2pg93]$ walmgr3 wal-slave.ini createslave

2013-12-23 22:21:20,2164306 INFO Backup lock obtained.

2013-12-23 22:21:22,772 4306 INFO pg_basebackup finished successfully

server starting

LOG: database system was interrupted; last kNown up at 2013-12-23 22:21:20 EST

LOG: creating missing WAL directory "pg_xlog/archive_status"

LOG: entering standby mode

2013-12-23 22:21:23,149 4358 INFO 00000003.history: Found

LOG: restored log file "00000003.history" from archive

LOG: restored log file "000000030000000000000036" from archive

LOG: redo starts at 0/36000028

LOG: consistent recovery state reached at 0/360000F0

LOG: database system is ready to accept read only connections

LOG: started streaming WAL from primary at 0/37000000 on timeline 3

2013-12-23 22:21:27,845 4306 INFO pg_receivelog stopped

2013-12-23 22:21:27,846 4306 INFO Streaming replication standby created successfully

四、参考文献

http://pgfoundry.org/projects/skytools/

http://skytools.projects.pgfoundry.org/skytools-3.0/

http://skytools.projects.pgfoundry.org/skytools-3.0/doc/skytools3.html

http://wiki.postgresql.org/wiki/Skytools#Documentation_3

http://wiki.postgresql.org/wiki/Londiste_Tutorial

五、错误解决 5.1、importError

错误现象：

[pg90@localhostconf]$ londiste3 part1.ini create-root part1_root dbname=part1

Traceback (most recent call last):

file"/opt/skytools/bin/londiste3",line 8,in <module>

importpkgloader

importError: No module named pkgloader

解决办法：

[[email protected]]# python setup_pkgloader.py build

[[email protected]]# python setup_pkgloader.py install

[[email protected]]# python setup_skytools.py build

[[email protected]]# python setup_skytools.py install

5.2、ProgrammingError

ProgrammingError: schema "partconf" does not exist

解决方法：

在root节点上也创建partconf模式：

part_root=# CREATE SCHEMA partconf;

CREATE SCHEMA

part_root=# CREATE table partconf.conf (

part_root(# part_nr integer,

part_root(# max_part integer,Simsun;vertical-align:baseline;">part_root(# db_code bigint,Simsun;vertical-align:baseline;">part_root(# is_primary boolean,Simsun;vertical-align:baseline;">part_root(# max_slot integer,Simsun;vertical-align:baseline;">part_root(# cluster_name text

part_root(# );

CREATE table

5.3、hash_string

part_root=# CREATE FUNCTION partconf.get_hash_raw

part_root-# ( i_input integer)

part_root-# RETURNS integer

part_root-# LANGUAGE sql

part_root-# AS $$

part_root$# -- used to wrap hashtext so that we can replace it in 8.4

part_root$# -- with older implementation to keep compatibility

part_root$# select hash_string($1::text,'lookup2');

part_root$# $$;

ERROR: function hash_string(text,unkNown) does not exist

liNE 8: select hash_string($1::text,Simsun;vertical-align:baseline;"> ^

HINT: No function matches the given name and argument types. You might need to add explicit type casts.

5.4、rst2HTML

[postgres@localhostpghashlib-master]$ make install

/bin/mkdir -p '/opt/pgsql/lib'

/bin/mkdir -p '/opt/pgsql/share/contrib'

/bin/mkdir -p '/opt/pgsql/share/doc/contrib'

/bin/sh /opt/pgsql/lib/pgxs/src/makefiles/../../config/install-sh -c -m 755 hashlib.so '/opt/pgsql/lib/hashlib.so'

rst2HTML README.rst > hashlib.HTML

/bin/sh: rst2HTML: command not found

make: *** [hashlib.HTML] Error 127

make: *** Deleting file `hashlib.HTML'

下载docutils并安装https://pypi.python.org/pypi/docutils

[[email protected]]# python setup.py install

[root@localhost~]# ln -s /opt/python25/bin/rst2HTML.py /usr/bin/rst2HTML

5.5、undefined symbol: le64toh

[postgres@localhostextension]$ psql test < hashlib--1.0.sql

ERROR: Could not load library "/opt/pgsql/lib/hashlib.so": /opt/pgsql/lib/hashlib.so: undefined symbol: le64toh

换64位 *** 作系统

5.6、找不到头文件

编译skytools报错，找不到相应头文件

[[email protected]]# make

……

make[3]: Entering directory `/root/skytools-3.1.5/sql/pgq/lowlevel'

gcc -O2 -Wall -Wmissing-prototypes -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing -fwrapv -fpic -DHAVE_CONfig_H -I. -I. -I/Opt/pg93/include/server -I/Opt/pg93/include/internal -D_GNU_SOURCE -c -o insert_event.o insert_event.c

insert_event.c:19:22: error: postgres.h: No such file or directory

insert_event.c:20:21: error: funcAPI.h: No such file or directory

insert_event.c:22:29: error: catalog/pg_type.h: No such file or directory

insert_event.c:23:30: error: commands/trigger.h: No such file or directory

insert_event.c:24:26: error: executor/spi.h: No such file or directory

insert_event.c:25:28: error: lib/stringinfo.h: No such file or directory

insert_event.c:26:28: error: utils/builtins.h: No such file or directory

insert_event.c:27:28: error: utils/datetime.h: No such file or directory

insert_event.c:28:27: error: utils/hsearch.h: No such file or directory

insert_event.c:29:25: error: access/xact.h: No such file or directory

错误原因：

9.3中头文件路径发生了变化（/opt/pg93/include/postgresql/server），但skytools还是按照之前版本的路径查找（/opt/pg93/include/server）