pgpool简明使用教程
一、系统环境
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172.16.3.226(master)
172.16.3.228(slave)
172.16.3.229(pgpool)
# yum install -y gcc-c++ zlib-devel readline-devel
# useradd postgres
# passwd postgres
Changing password for user postgres.
New password:
BAD PASSWORD: The password contains the user name in some form
Retype new password:
passwd: all authentication tokens updated successfully.
#
1.安装postgresql
# vi /etc/profile
export PATH=/opt/pgsql/10.0/bin:$PATH
export LD_LIBRARY_PATH=/opt/pgsql/10.0/lib
export MANPATH=/opt/pgsql/10.0/share/man:$MANPATH
[root@pgpool ~]#
# tar zxvf pgpool-II-3.6.6.tar.gz
# cd pgpool-II-3.6.6
# ./configure --prefix=/opt/pgpool/3.6.6 --sysconfdir=/etc/pgpool/
# make
# make install
# cp src/redhat/pgpool.service /lib/systemd/system/
# chmod +x /lib/systemd/system/pgpool.service
# systemctl enable pgpool.service
#
# vi /lib/systemd/system/pgpool.service
[Unit]
Description=Pgpool-II
After=syslog.target network.target
Wants=network.target
[Service]
Type=forking
EnvironmentFile=-/etc/sysconfig/pgpool
ExecStart=/opt/pgpool/3.6.6/bin/pgpool -f /etc/pgpool/pgpool.conf $OPTS
ExecStop=/opt/pgpool/3.6.6/bin/pgpool -f /etc/pgpool/pgpool.conf $STOP_OPTS stop
ExecReload=/opt/pgpool/3.6.6/bin/pgpool -f /etc/pgpool/pgpool.conf reload
[Install]
WantedBy=multi-user.target
#####################################################################
# chown postgres -R /opt/pgpool/3.6.6
# chown postgres -R /etc/pgpool/
# su - postgres
[postgres@pgpool ~]$ cd /opt/pgpool/3.6.6/
[postgres@pgpool 3.6.6]$ mkdir log
# su - postgres
Last login: Mon Sep 11 15:08:36 CST 2017 on pts/1
[postgres@pgpool ~]$
[postgres@pgpool ~]$
[postgres@pgpool ~]$ cd /etc/pgpool/
[postgres@pgpool pgpool]$ mv pgpool.conf.sample-stream pgpool.conf
[postgres@pgpool pgpool]$ vi pgpool.conf
listen_addresses = '*'
port = 5432
# - Backend Connection Settings -
backend_hostname0 = '172.16.3.226'
# Host name or IP address to connect to for backend 0
backend_port0 = 5432
# Port number for backend 0
backend_weight0 = 1
# Weight for backend 0 (only in load balancing mode)
backend_data_directory0 = '/pgdata10'
# Data directory for backend 0
backend_flag0 = 'DISALLOW_TO_FAILOVER'
# Controls various backend behavior
# ALLOW_TO_FAILOVER or DISALLOW_TO_FAILOVER
backend_hostname1 = '172.16.3.228'
backend_port1 = 5432
backend_weight1 = 1
backend_data_directory1 = '/pgdata10'
backend_flag1 = 'DISALLOW_TO_FAILOVER'
#------------------------------------------------------------------------------
# POOLS
#------------------------------------------------------------------------------
# - Concurrent session and pool size -
num_init_children = 25
# Number of concurrent sessions allowed
# (change requires restart)
max_pool = 10
# Number of connection pool caches per connection
# (change requires restart)
# - Life time -
#------------------------------------------------------------------------------
# REPLICATION MODE
#------------------------------------------------------------------------------
replication_mode = off
#------------------------------------------------------------------------------
# LOAD BALANCING MODE
#------------------------------------------------------------------------------
load_balance_mode = on
#------------------------------------------------------------------------------
# MASTER/SLAVE MODE
#------------------------------------------------------------------------------
master_slave_mode = on
# Activate master/slave mode
# (change requires restart)
master_slave_sub_mode = 'stream'
# Master/slave sub mode
# Valid values are combinations slony or
# stream. Default is slony.
# (change requires restart)
# - Streaming -
sr_check_period = 10
# Streaming replication check period
# Disabled (0) by default
sr_check_user = 'postgres'
#------------------------------------------------------------------------------
# HEALTH CHECK
#------------------------------------------------------------------------------
health_check_period = 0
# Health check period
# Disabled (0) by default
health_check_timeout = 20
# Health check timeout
# 0 means no timeout
health_check_user = 'postgres'
# -- query mode --
wd_life_point = 3
# lifecheck retry times
# (change requires restart)
wd_lifecheck_query = 'SELECT 1'
# lifecheck query to pgpool from watchdog
# (change requires restart)
wd_lifecheck_dbname = 'template1'
# Database name connected for lifecheck
# (change requires restart)
wd_lifecheck_user = 'postgres'
#------------------------------------------------------------------------------
# FILE LOCATIONS
#------------------------------------------------------------------------------
pid_file_name = '/opt/pgpool/3.6.6/pgpool.pid'
# - What to log -
log_line_prefix = '%t [%p]: [%l-1] db=%d,user=%u,app=%a,client=%h ' # printf-style string to output at beginning of each log line.
log_connections = on
# Log connections
log_hostname = on
# Hostname will be shown in ps status
# and in logs if connections are logged
log_statement = on
# Log all statements
log_per_node_statement = on
# systemctl start pgpool.service
# systemctl status pgpool.service
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