下載地址：http://pgpool.net/mediawiki/index.php/Downloads 環(huán)境： 兩臺(tái)redhat linux 6.5 兩臺(tái)機(jī)器上均安裝好pg（本機(jī)postgresql9.4.4） ip： data1 192.168.1.10 （主） pgpool安裝在此機(jī)器上 data2 192.168.1.11 （備） 1、源碼安裝 [root@localhost ~]# tar xvf pgpool-II-3.3.3.tar.gz [root@localhost ~]# mkdir /opt/pgpool [root@localhost ~]# chown -R postgres:postgres /opt/* [root@localhost ~]# su - postgres [postgres@localhost~]$ cd /tmp/pgpool-II-3.3.3 [postgres@localhost pgpool-II-3.3.3]$ ./configure --prefix=/opt/pgpool [postgres@localhost pgpool-II-3.3.3]# configure: error: libpq is not installed or libpq is old 缺少軟件包，掛載鏡像，配置yum源 [postgres@localhost pgpool-II-3.3.3]# yum install postgresql* -y [postgres@localhost pgpool-II-3.3.3]$ ./configure --prefix=/opt/pgpool [postgres@localhost pgpool-II-3.3.3]$ make [postgres@localhost pgpool-II-3.3.3]$ make install2、安裝pgpool_regclass 和pgpool-recovery [postgres@localhost pgpool-II-3.3.3]$ cd /tmp/pgpool-II-3.3.3/sql/pgpool-regclass [postgres@localhost pgpool_regclass]$ make && make install [postgres@localhost pgpool_regclass]$ psql -f pgpool-regclass.sql template1 [postgres@localhost pgpool_regclass]$ cd /tmp/pgpool-II-3.3.3/sql/pgpool-recovery [postgres@localhost pgpool-recovery]$ make && make install [postgres@localhost pgpool-recovery]$ psql -f pgpool-recovery.sql template1 3、建立inert_lock表 [postgres@localhost pgpool-recovery]$ cd /tmp/pgpool-II-3.3.3/sql/ [postgres@localhost sql]$ psql -f insert_lock.sql template1 4、配置即使用 查看配置文件 [postgres@localhost pgpool-II-3.3.3]$ cd /opt/pgpool/etc/ [postgres@localhost etc]$ ll total 180 -rw-r--r--. 1 postgres postgres 858 Dec 19 13:28 pcp.conf.sample -rw-r--r--. 1 postgres postgres 30979 Dec 19 13:28 pgpool.conf.sample -rw-r--r--. 1 postgres postgres 30669 Dec 19 13:28 pgpool.conf.sample-master-slave -rw-r--r--. 1 postgres postgres 30651 Dec 19 13:28 pgpool.conf.sample-replication -rw-r--r--. 1 postgres postgres 30690 Dec 19 13:28 pgpool.conf.sample-stream -rw-r--r--. 1 postgres postgres 3200 Dec 19 13:28 pool_hba.conf.sample -rw-rw-r--. 1 postgres postgres 43 Dec 19 13:53 pool_passwd 切換到root用戶下z [root@localhost etc]chown postgres:postgres -R /opt/ [root@localhost etc]su - postgres [postgres@localhost ]cd /opt/pgpool/etc/ [postgres@localhost etc]$ cp pgpool.conf.sample pgpool.conf [postgres@localhost etc]$ cp pcp.conf.sample pcp.conf [postgres@localhost etc]$ cp pool_hba.conf.sample pool_hba.conf pg_pool默認(rèn)只接受端口的本地連接。如果想從其他主機(jī)接受連接，請?jiān)O(shè)置listen_address='*' ,相對(duì)應(yīng)在pgpool.conf中配置修改如下： listen_address='*' port =9999 因?yàn)椴皇前惭b在默認(rèn)的“/usr/local/”目錄下的，所以要指定目錄的配置項(xiàng)， pid_file_name ='/opt/pgpool/run/pgpool.pid' 創(chuàng)建相對(duì)應(yīng)目錄的命令 [postgres@localhost etc]$mkdir /opt/pgpool/run 配置后端數(shù)據(jù)庫，pgpool.conf # - Backend Connection Settings - 這一部分用來配置后臺(tái)連接的數(shù)據(jù)庫 backend_hostname0 = '192.168.1.10' backend_port0 = 5432 backend_weight0 = 1 backend_data_directory0 = '/opt/pgsql-9.4.4/data' backend_flag0 = 'ALLOW_TO_FAILOVER' backend_hostname1 = '192.168.1.11' backend_port1 = 5432 backend_weight1 = 1 backend_data_directory1 = '/opt/pgsql-9.4.4/data' backend_flag1 = 'ALLOW_TO_FAILOVER' 一般使用hba的方式進(jìn)行登錄認(rèn)證。所以要在pgpool.conf中打開如下選項(xiàng)： enable_pool_nba=on 通常會(huì)把訪問pgpool的用戶名和密碼的MD5值記錄在/opt/pgpool/etc/pool_passwd中 修改.bash_profile文件， PATH=/opt/pgsql-9.4.4/bin:$PATH:/opt/pgpool/bin [postgres@localhost etc]$ pg_md5 -m -p -u postgres pool_passwd passwd: 這樣就生成了pool_passwd文件，使用cat查看文件內(nèi)容： postgres:md5279d84d3239474da07235e5a6555c73b 啟動(dòng)pgpool [postgres@localhost etc]$ pgpool 如果想讓pgpool在前臺(tái)運(yùn)行，可以加“-n”參數(shù) [postgres@localhost etc]$ pgpool -n 如果想讓日志打印到一個(gè)文件。使用一下命令 [postgres@localhost etc]$ pgpool -n> /tmp/pgpool.log 2>&1 & 如果想打印調(diào)度信息，加上參數(shù)“-d” [postgres@localhost etc]$ pgpool -n -d > /tmp/pgpool.log 2>&1 & 停止pgpool [postgres@localhost etc]$ pgpool stop 也可以加上參數(shù) [postgres@localhost etc]$ pgpool -m fast stop5、復(fù)制和負(fù)載均衡的示例 192.168.1.10 為安裝pgpool的服務(wù)器 192.168.1.11 為后端數(shù)據(jù)節(jié)點(diǎn)在pgpool.conf中配置以下內(nèi)容： replication_mode = true load_balance_mode = true backend_hostname0 = '192.168.1.10' backend_port0 = 5432 backend_weight0 = 1 backend_data_directory0 = '/opt/pgsql-9.4.4/data' backend_flag0 = 'ALLOW_TO_FAILOVER' backend_hostname1 = '192.168.1.11' backend_port1 = 5432 backend_weight1 = 1 backend_data_directory1 = '/opt/pgsql-9.4.4/data' backend_flag1 = 'ALLOW_TO_FAILOVER'啟動(dòng)pgpool pgpool -n -d > /tmp/pgpool.log 2>&1 & 在data1上連接pgpool的端口9999，然后創(chuàng)建一張表。并插入數(shù)據(jù) [postgres@localhost etc]$ psql -h 192.168.1.10 -d postgres -p 9999 -U postgres psql (9.4.4) Type "help" for help. postgres=# \d List of relations Schema | Name | Type | Owner ----------------+------+------+-------- oracle_catalog | dual | view | postgres (1 row) postgres=# create table aaa (a int); CREATE TABLE highgo=# \d List of relations Schema | Name | Type | Owner ----------------+------+-------+-------- oracle_catalog | dual | view | postgres public | aaa | table | postgres (2 rows) postgres=# insert into aaa values (1); INSERT 0 1 postgres=# insert into aaa values (2); INSERT 0 1 postgres=# insert into aaa values (3); INSERT 0 1 postgres=# select * from aaa ; a --- 1 2 3 (3 rows) 在data2上可以看到，表和數(shù)據(jù)都弄好了，而且數(shù)據(jù)完全一樣 [postgres@localhost data]$ psql Password: psql (9.4.4) Type "help" for help. postgres=# \d List of relations Schema | Name | Type | Owner ----------------+------+-------+-------- oracle_catalog | dual | view | postgres public | aaa | table | postgres (2 rows) postgres=# select * from aaa ; a --- 1 2 3 (3 rows)

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