利用pgpool實現PostgreSQL的高可用 原 薦

原創 PGSmith 2018-12-02 21:20

基於流複製的方式，兩節點自動切換：

    1、單pgpool

        a.環境： 

pgpool：192.168.238.129
data1：192.168.238.130
data2：192.168.238.131

        b.圖例

        c.配置互信 

ssh-copy-id ha@node1
ssh-copy-id ha@node2
        d.數據庫節點配置，請參照《 使用pg_basebackup搭建PostgreSQL流複製環境 》。


        e.pgpool配置： 

listen_addresses = '*'
backend_hostname0 = 'node1'
backend_port0 = 5432
backend_weight0 = 1
backend_data_directory0 = '/home/ha/pgdb/data'
backend_flag0 = 'ALLOW_TO_FAILOVER'

backend_hostname1 = 'node2'
backend_port1 = 5432
backend_weight1 = 1
backend_data_directory1 = '/home/ha/pgdb/data'
backend_flag1 = 'ALLOW_TO_FAILOVER'

enable_pool_hba = on
pool_passwd = 'pool_passwd'

pid_file_name = '/home/ha/pgpool/pgpool.pid'
logdir = '/home/ha/pgpool/log'

health_check_period = 1
health_check_user = 'ha'
health_check_password = 'ha'

failover_command = '/home/ha/pgdb/fail.sh %H'

recovery_user = 'ha'
recovery_password = 'ha'
        f.fail.sh 
# Failover command for streaming replication.
# This script assumes that DB node 0 is primary, and 1 is standby.
#
# If standby goes down, do nothing. If primary goes down, create a
# trigger file so that standby takes over primary node.
#
# Arguments: $1: failed node id. $2: new master hostname. $3: path to
# trigger file.

new_master=$1
trigger_command="/home/ha/pgdb/bin/pg_ctl -D /home/ha/pgdb/data promote -m fast"

# Do nothing if standby goes down.
if [ $failed_node = 1 ]; then
        exit 0;
fi

# Create the trigger file.
/usr/bin/ssh -T $new_master $trigger_command

exit 0;

        g.建立pool_passwd 

pg_md5 -m -p -u postgres pool_passwd
        PS：在9.1之前一直用的是trigger_file，這裏建議用promote -m fast的方式，因爲
pg_ctl promote -m fast will skip the checkpoint at end of recovery so that we can achieve very fast failover when the apply delay is low. Write new WAL record XLOG_END_OF_RECOVERY to allow us to switch timeline correctly for downstream log readers. If we skip synchronous end of recovery checkpoint we request a normal spread checkpoint so that the window of re-recovery is low. Simon Riggs and Kyotaro Horiguchi, with input from Fujii Masao. Review by Heikki Linnakangas
        h.測試
          pgpool節點 
[ha@node0 pgdb]$ pgpool -n -d > /tmp/pgpool.log 2>&1 &
[1] 22928
[ha@node0 pgdb]$ psql -h 192.168.238.129 -p 9999 -d postgres -U ha
Password for user ha: 
psql (9.4.5)
Type "help" for help.

postgres=# insert into test values (8);
INSERT 0 1
postgres=# select * from test ;
 id 
----
  1
  2
  3
  4
  6
  8
(6 rows)
         node1節點： 
[ha@localhost pgdb]$ ps -ef | grep post
root       2124      1  0 Dec26 ?        00:00:00 /usr/libexec/postfix/master
postfix    2147   2124  0 Dec26 ?        00:00:00 qmgr -l -t fifo -u
postfix   13295   2124  0 06:01 ?        00:00:00 pickup -l -t fifo -u
ha        13395      1  0 06:06 pts/3    00:00:00 /home/ha/pgdb/bin/postgres
ha        13397  13395  0 06:06 ?        00:00:00 postgres: checkpointer process   
ha        13398  13395  0 06:06 ?        00:00:00 postgres: writer process   
ha        13399  13395  0 06:06 ?        00:00:00 postgres: wal writer process   
ha        13400  13395  0 06:06 ?        00:00:00 postgres: autovacuum launcher process   
ha        13401  13395  0 06:06 ?        00:00:00 postgres: stats collector process   
ha        13404  13395  0 06:07 ?        00:00:00 postgres: wal sender process rep 192.168.238.131(59415) streaming 0/21000060
ha        13418   4087  0 06:07 pts/3    00:00:00 grep post
[ha@localhost pgdb]$ kill -9 13395
         pgpool節點： 
postgres=# insert into test values (8);
server closed the connection unexpectedly
	This probably means the server terminated abnormally
	before or while processing the request.
The connection to the server was lost. Attempting reset: Succeeded.
postgres=# insert into test values (8);
INSERT 0 1
postgres=# insert into test values (8);
INSERT 0 1
postgres=# select * from test ;
 id 
----
  1
  2
  3
  4
  6
  8
  8
  8
(8 rows)

    2.兩個pgpool節點

        a.環境 

pgpool:192.168.238.129  pgpool:192.168.238.131
node1:192.168.238.130
node2:192.168.238.131

        b.圖例

        c.配置互信，同上。
        d.數據庫節點配置，同上。
        e.pgpool配置
            node1

          f.配置pgpool（主） 
listen_addresses = '*'
backend_hostname0 = 'node1'
backend_port0 = 5432
backend_weight0 = 1
backend_data_directory0 = '/home/ha/pgdb/data/'
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = 'node2'
backend_port1 = 5432
backend_weight1 = 1
backend_data_directory1 = '/home/ha/pgdb/data/'
backend_flag1 = 'ALLOW_TO_FAILOVER'
enable_pool_hba = on
authentication
pool_passwd = 'pool_passwd'
pid_file_name = '/home/ha/pgpool/pgpool.pid'
logdir = '/tmp/log'
master_slave_mode = on
master_slave_sub_mode = 'stream'
sr_check_period =2
sr_check_user = 'ha'
sr_check_password = 'ha'
health_check_period = 1
health_check_timeout = 20
health_check_user = 'ha'
health_check_password = 'ha'
failover_command = '/home/ha/pgpool/fail.sh %H'
recovery_user = 'ha'
recovery_password = 'ha'
use_watchdog = on
wd_hostname = 'node1'    #本端
delegate_IP = '192.168.238.151'
#利用ifconfig，查看網卡
if_up_cmd = 'ifconfig eth1:0 inet $_IP_$ netmask 255.255.255.0'
if_down_cmd = 'ifconfig eth1:0 down'
heartbeat_destination0 = 'node2' #對端
heartbeat_device0 = 'eth0'
other_pgpool_hostname0 = 'node2' #對端
other_pgpool_port0 =9999
other_wd_port0 = 9000

        g.配置pgpool（從）
 

listen_addresses = '*'
backend_hostname0 = 'node1'
backend_port0 = 5432
backend_weight0 = 1
backend_data_directory0 = '/home/ha/pgdb/data/'
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = 'node2'
backend_port1 = 5432
backend_weight1 = 1
backend_data_directory1 = '/home/ha/pgdb/data/'
backend_flag1 = 'ALLOW_TO_FAILOVER'
enable_pool_hba = on
authentication
pool_passwd = 'pool_passwd'
pid_file_name = '/home/ha/pgpool/pgpool.pid'
logdir = '/tmp/log'
master_slave_mode = on
master_slave_sub_mode = 'stream'
sr_check_period =2
sr_check_user = 'ha'
sr_check_password = 'ha'
health_check_period = 1
health_check_timeout = 20
health_check_user = 'ha'
health_check_password = 'ha'
failover_command = '/home/ha/pgpool/fail.sh %H'
recovery_user = 'ha'
recovery_password = 'ha'
use_watchdog = on
wd_hostname = 'node2'    #本端
delegate_IP = '192.168.238.151'
#利用ifconfig，查看網卡
if_up_cmd = 'ifconfig eth1:0 inet $_IP_$ netmask 255.255.255.0'
if_down_cmd = 'ifconfig eth1:0 down'
heartbeat_destination0 = 'node1' #對端
heartbeat_device0 = 'eth1'
other_pgpool_hostname0 = 'node1' #對端
other_pgpool_port0 =9999
other_wd_port0 = 9000

        h.fail.sh 

# Failover command for streaming replication.
# This script assumes that DB node 0 is primary, and 1 is standby.
#
# If standby goes down, do nothing. If primary goes down, create a
# trigger file so that standby takes over primary node.
#
# Arguments: $1: failed node id. $2: new master hostname. $3: path to
# trigger file.

new_master=$1
trigger_command="/home/ha/pgdb/bin/pg_ctl -D /home/ha/data start"

# Do nothing if standby goes down.
if [ $failed_node = 1 ]; then
        exit 0;
fi

# Create the trigger file.
/usr/bin/ssh -T $new_master $trigger_command

exit 0;
            i.建立pool_passwd 
pg_md5 -m -p -u postgres pool_passwd

        j.測試 

#數據庫、pgpool啓動
[ha@node0 pgdb]$ psql -h 192.168.238.151 -p 9999 -d postgres -U ha
Password for user ha: 
psql (9.4.5)
Type "help" for help.

postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
postgres=# 
--殺掉node1的數據庫進程
postgres=# insert into test values (9);
server closed the connection unexpectedly
	This probably means the server terminated abnormally
	before or while processing the request.
The connection to the server was lost. Attempting reset: Succeeded.
postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
--殺掉node1的pgpool進程
postgres=# insert into test values (9);
server closed the connection unexpectedly
	This probably means the server terminated abnormally
	before or while processing the request.
The connection to the server was lost. Attempting reset: Succeeded.
postgres=# insert into test values (9);
INSERT 0 1
postgres=# insert into test values (9);
INSERT 0 1
postgres=#




發表評論
所有評論
還沒有人評論，想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.
相關文章

Systemd 筆記

Colben 2018-12-08 21:18:17

arm 彙編與c語言 原

天王蓋地虎626 2018-12-02 21:14:36

MySQL複製(Replication)的理解

huhai11 2019-02-22 23:03:28

Discuz!NT負載均衡解決方案(HA)之---LVS(Linux Virtual Server)

daizhenjun 2019-02-22 21:25:24

通過heartbeat 2.X 實現高可用lamp

koubukou2012 2019-02-22 20:53:51

kolla ansbile啓用neutron ha

757781091 2019-02-22 20:29:00

高可用集羣

red777 2019-02-22 20:23:22

heartbeat 安裝配置

xujh1986 2019-02-22 20:01:41

Linux HA集羣

羊木狼 2019-02-22 18:30:52

haproxy負載均衡

lglinux 2019-02-22 18:08:12

Rancher HA高可用集羣部署文檔

東北你翔哥 2019-02-22 15:03:31

LVS/NAT雙主 + keepalived負載均衡實現

hahazhu0634 2019-02-22 13:45:42

hadoop ha

重慶沙 2019-02-22 13:12:15

Spark 集羣部署（MasterHA）

LynnYuanJn 2018-12-29 13:45:31

Rancher HA高可用集羣部署文檔

silence12138 2018-11-24 02:30:32