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比来一向研究postgresql，也想做一个像mysql一样的replication。 究竟结果单台postgresql不管机能若何，总有撑不下去的时辰。
网上查了下关于postgresql的一些资料，发现pg自己不带replication这个功能，master-slave也没有，可是一些第三方的软件可以撑持这些，一路头发现slony仿佛看着不错，可是配了一天发现这个工具设置装备摆设其实是太复杂了，需要手动增添相干的库，今后增添新的也比力麻烦，而功能也比力单一。
后来问了下公司里来自yahoo的同事，发现yahoo是利用pgpool-II来实现的。找了下资料发现这个设置装备摆设比力简单，根基是单个设置装备摆设文件便可以弄定，并且有分歧的conf.sample供给出来，有master-slave的config sample和replication的config sample.如许就节流了年夜量的时候了。
说下安装进程，仍是比力简单。 安装时辰需要指定一下postgresql的安装路径便可以了，其它没有特此外。 --with-pgsql=
--with-pgsql-includedir=
--with-pgsql-ibdir=
安装完成后在安装目次的etc下有几个实例文件。里面申明的也比力清晰。下面点窜的一个是监听端口，因为我不想改法式，所以就让pgpoo-II直接监听5432端口，这个也是postgresql的默许端口。别的一个是relication_mode=yes,这个必然要如许选。load_balance_mode = true 这个就随便了，这个就是把select查询分派到2个分歧的机械上。
#
# pgpool-II configuration file sample
# $Header: /cvsroot/pgpool/pgpool-II/pgpool.conf.sample,v 1.26 2009/02/15 05:26:28 t-ishii Exp $
# Host name or IP address to listen on: '*' for all, '' for no TCP/IP
# connections
listen_addresses = '192.168.100.1'
# Port number for pgpool
port = 5432
# Port number for pgpool communication manager
pcp_port = 9898
# Unix domain socket path. (The Debian package defaults to
# /var/run/postgresql.)
socket_dir = '/tmp'
# Unix domain socket path for pgpool communication manager.
# (Debian package defaults to /var/run/postgresql)
pcp_socket_dir = '/tmp'
# Unix domain socket path for the backend. Debian package defaults to /var/run/postgresql!
backend_socket_dir = '/tmp'
# pgpool communication manager timeout. 0 means no timeout,互联网行业的从业人员生怕年夜学结业, but strongly not recommended!
pcp_timeout = 5
# number of pre-forked child process
num_init_children = 32
# Number of connection pools allowed for a child process
max_pool = 10
# If idle for this many seconds, child exits. 0 means no timeout.
child_life_time = 300
# If idle for this many seconds, connection to PostgreSQL closes.
# 0 means no timeout.
connection_life_time = 0
# If child_max_connections connections were received, child exits.
# 0 means no exit.
child_max_connections = 0
# If client_idle_limit is n (n 0), the client is forced to be
# disconnected whenever after n seconds idle (even inside an explicit
# transactions!)
# 0 means no disconnect.
client_idle_limit = 0
# Maximum time in seconds to complete client authentication.
# 0 means no timeout.
authentication_timeout = 10
# Logging directory
logdir = '/tmp'
# pid file name
pid_file_name = '/tmp/pgpool.pid'
# Replication mode
replication_mode = true
# Load balancing mode,随记。。。。。。。。, i.e., all SELECTs are load balanced.
# This is ignored if replication_mode is false.
load_balance_mode = true
# if there's a data mismatch between master and secondary
# start degeneration to stop replication mode
replication_stop_on_mismatch = false
# If true, replicate SELECT statement when load balancing is disabled.
# If false, it is only sent to the master node.
replicate_select = false
# Semicolon separated list of queries to be issued at the end of a session
reset_query_list = 'ABORT; RESET ALL; SET SESSION AUTHORIZATION DEFAULT'
# for 8.3 or newer PostgreSQL versions DISCARD ALL can be used as
# follows. However beware that DISCARD ALL holds exclusive lock on
# pg_listener so it will be a serious performance problem if there are
# lots of concurrent sessions.
# reset_query_list = 'ABORT; DISCARD ALL'
# If true print timestamp on each log line.
print_timestamp = true
# If true, operate in master/slave mode.
master_slave_mode = false
# If true,深海的呼喊, cache connection pool.
connection_cache = true
# Health check timeout. 0 means no timeout.
health_check_timeout = 20
# Health check period. 0 means no health check.
health_check_period = 0
# Health check user
health_check_user = 'nobody'
# Execute command by failover.
# special values: %d = node id
# %h = host name
# %p = port number
# %D = database cluster path
# %m = new master node id
# %M = old master node id
# %% = '%' character
#
failover_command = ''
# Execute command by failback.
# special values: %d = node id
# %h = host name
# %p = port number
# %D = database cluster path
# %m = new master node id
# %M = old master node id
# %% = '%' character
#
failback_command = ''
# If true, automatically locks a table with INSERT statements to keep
# SERIAL data consistency. If the data does not have SERIAL data
# type, no lock will be issued. An /*INSERT LOCK*/ comment has the
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