pgpool流复制&failover故障切换
参看：
http://blog.163.com/czg_e/blog/static/461045612012129105020629/
http://pgpool.projects.pgfoundry.org/pgpool-II/doc/pgpool-zh_cn.html#connection_pool_mode
http://dz.sdut.edu.cn/blog/subaochen/?p=430
同一台机子不同端口
下载安装pgpool:
http://blog.163.com/binglan_1208@126/blog/static/234575252014229112048666
配置pool_hba.conf
cp /opt/pgpool/etc/pool_hba.conf.sample
/opt/pgpool/etc/pool_hba.conf
# "local" is for Unix domain socket connections only
local all all trust
# IPv4 local connections:
host all all 127.0.0.1/32 trust
host all all 127.0.0.1 trust
配置
pgpool.conf
:
cp /opt/pgpool/etc/pool_hba.conf.sample
/opt/pgpool/etc/pool_hba.conf
listen_addresses = '*'
port = 9999
pcp_port = 9898
# - Backend Connection Settings -
backend_hostname0 = '127.0.0.1'
# Host name or IP address to connect to for backend 0
backend_port0 = 5001
# Port number for backend 0
backend_weight0 = 1
# Weight for backend 0 (only in load balancing mode)
backend_data_directory0 = '/home/pg93/ms/master'
# Data directory for backend 0
backend_flag0 = 'ALLOW_TO_FAILOVER'
# Controls various backend behavior
# ALLOW_TO_FAILOVER or DISALLOW_TO_FAILOVER
backend_hostname1 = '127.0.0.1'
backend_port1 = 5002
backend_weight1 = 1
backend_data_directory1 = '/home/pg93/ms/slave'
backend_flag1 = 'ALLOW_TO_FAILOVER'
log_statement = on
log_per_node_statement= on
pid_file_name = '/opt/pgpool/pgpool.pid'
logdir = '/opt/pgpool/log'
failover_command = '/opt/pgpool/etc/failedcommand.sh %d %H /tmp/trigger_file'
replication_mode= off
master_slave_mode =on
master_slave_sub_mode = 'stream'
sr_check_user = 'postgres'
#sr_check_password = '' #如果是trust则注释掉
load_balance_mode = on
log_connections = on
log_hostname = on
debug_level = 1
delay_threshold = 1000
master:
initdb -D
/home/pg93/ms/master
-E UTF8 --locale=C -U postgres -W
配置pg_hba.conf
# "local" is for Unix domain socket connections only
local all all trust
# IPv4 local connections:
host all all 127.0.0.1/32 trust
# IPv6 local connections:
host all all ::1/128 trust
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local replication postgres trust
host replication postgres 127.0.0.1/32 trust
host replication postgres ::1/128 trust
host all all 0.0.0.0/0 trust
host replication postgres 127.0.0.1/32 trust配置postgresql.conf
listen_addresses = '*'
port = 5001
# primary server需要
wal_level = hot_standby
# 这个不是必需的
archive_mode = on
archive_command = 'cp %p /var/lib/postgresql/9.1/main/archive/%f'
# primary server需要
max_wal_senders = 32
# standby server需要
hot_standby = onlogging_collector = on
synchronous_commit = off
wal_keep_segments = 32
synchronous_standby_names = '*'
pg_ctl start -D /home/pg93/ms/master
psql -h 127.0.0.1 -p 5001 -U postgres postgres
select pg_start_backup('tag_xx');
select pg_is_in_backup();#查看是否在备份中backup。返回"t"表示true。“f”表示false。
\q 退出#
cp -r /home/pg93/ms/master/* /home/pg93/ms/slave/.
psql -h 127.0.0.1 -p 5001 -U postgres postgres
select pg_stop_backup();
\q
slaver:
配置postgresql.conf
port = 5002
hot_standby = onpg_ctl start -D /home/pg93/ms/slave
启动pgpool:
pgpool -nd
检查pgpool节点:
psql -h 127.0.0.1 -p 9999
show pool_nodes;
digoal=# show pool_nodes;
node_id | hostname | port | status | lb_weight | role
---------+-----------+------+--------+-----------+---------
0 | 127.0.0.1 | 5001 | 3 | 0.500000 | standby
1 | 127.0.0.1 | 5002 | 2 | 0.500000 | standby
(2 rows)
测试pgpool流复制:
psql -h 127.0.0.1 -p 9999
create table xxv(a int);
psql -h 127.0.0.1 -p 5002
select * from xxv;
测试pgpool的failover故障恢复:
pg_ctl -m fast stop -D
/home/pg93/ms/master
psql -h 127.0.0.1 -p 9999#如果能够正常访问则无问题。