PostgreSQL+pgpooll+Keepalived双机HA方案

PostgreSQL+pgpooll+Keepalived双机HA方案

(注:本文档中的所有操作在没有说明的情况下都应该使用postgres用户进行操作，postgres用户没有权限的操作方可采用root用户进行操作，可以在本方案中使用postgres用户及该用户的密码替换replcia及replica用户的密码)

方案逻辑图

192.168.100.3的pgpool故障图

192.168.100.4的pgpool故障图

192.168.100.3的Master故障图

一、环境信息

操作系统：CentOS6.6

数据库：PostgreSQL9.3.5

物理机两台：node1,node2

Keepalived:keepalived-1.2.15

pgpool:pgpool-II-3.3.3

一、     安装Linux操作系统CentOS6.6(两台物理机操作)

主节点：node1:IP:192.168.100.3

备节点：node2:IP:192.168.2.4

VIP：192.168.100.4

二、     安装完Linux操作系统之后的系统调整(两台物理机操作)

2.1主备节点时钟同步:

/usr/sbin/ntpdate asia.pool.ntp.org && /sbin/hwclock –systohc

2.2给两个机器分别命名：node1,node2

第一台机器命名为node1

2.2.1 修改/etc/sysconfig/network中的hostname
vi /etc/sysconfig/network
HOSTNAME=node1 #修改localhost.localdomain为node1

2.2.2 修改/etc/hosts文件
vi /etc/hosts
127.0.0.1 node1 localhost #修改localhost.localdomain为node1
shutdown -r now #最后，重启服务器即可

第二台机器命名为node2

2.2.3 修改/etc/sysconfig/network中的hostname
vi /etc/sysconfig/network
HOSTNAME=node2 #修改localhost.localdomain为node2

2.2.4 修改/etc/hosts文件
vi /etc/hosts
127.0.0.1 node2 localhost #修改localhost.localdomain为node2
shutdown -r now #最后，重启服务器即可。

2.3.OS资源调整

时区调整: (如果已经调好同步不需要做)

vi
/etc/sysconfig/clock

ZONE="Asia/Shanghai"

UTC=false

ARC=false

vi
/etc/sysconfig/i18n

LANG="en_US.UTF-8"

vi /etc/sysctl.conf

kernel.shmmni =
4096

kernel.sem = 50100
64128000 50100 1280

fs.file-max =
7672460

net.ipv4.ip_local_port_range
= 9000 65000

net.core.rmem_default
= 1048576

net.core.rmem_max =
4194304

net.core.wmem_default
= 262144

net.core.wmem_max =
1048576

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_max_syn_backlog
= 4096

net.core.netdev_max_backlog
= 10000

vm.overcommit_memory
= 0

net.ipv4.ip_conntrack_max
= 655360

fs.aio-max-nr =
1048576

net.ipv4.tcp_timestamps = 0

使文件修改生效

sysctl –p

vi
/etc/security/limits.conf

* soft nofile
131072

* hard nofile
131072

* soft nproc 131072

* hard nproc 131072

* soft core
unlimited

* hard core
unlimited

* soft memlock
50000000

* hard memlock 50000000

vi
/etc/sysconfig/selinux

SELINUX=disabled

setenforce 0

防火墙根据需要配置

vi
/etc/sysconfig/iptables

-A INPUT -s
192.168.0.0/16 -j ACCEPT

-A INPUT -s
10.0.0.0/8 -j ACCEPT

-A INPUT -s
172.16.0.0/16 -j ACCEPT

# or

-A INPUT -m state --state NEW -m tcp -p tcp --dport 5432
-j ACCEPT

service iptables restart

2.4.给两个节点分别创建postgres用户并设置密码

useradd postgres

password：postgres

2.5.配置两台机器的ssh免密钥登录

[postgres@node1]$
ssh-keygen -t rsa

Generating
public/private rsa key pair.

Enter
file in which to save the key (/var/lib/pgsql/.ssh/id_rsa):

Enter
passphrase (empty for no passphrase):

Enter
same passphrase again:

Your
identification has been saved in /var/lib/pgsql/.ssh/id_rsa.

Your
public key has been saved in /var/lib/pgsql/.ssh/id_rsa.pub.

The key
fingerprint is:

[postgres@node1]$
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

[postgres@node1]$
chmod go-rwx ~/.ssh/*

[postgres@node2$
ssh-keygen -t rsa

Generating
public/private rsa key pair.

Enter
file in which to save the key (/var/lib/pgsql/.ssh/id_rsa):

Enter
passphrase (empty for no passphrase):

Enter
same passphrase again:

Your
identification has been saved in /var/lib/pgsql/.ssh/id_rsa.

Your
public key has been saved in /var/lib/pgsql/.ssh/id_rsa.pub.

The key
fingerprint is:

[postgres@node2$
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

[postgres@node2$
chmod go-rwx ~/.ssh/*

[postgres@node1]$
cd ~/.ssh

[postgres@node1]$
scp id_rsa.pub  postgres@node2:/home/postgres/.ssh/id_rsa.pub1

[postgres@node2]
cd ~/.ssh

[postgres@node2]
cat id_rsa.pub1 | authorized_keys

[postgres@node2]scp
id_rsa.pub postgres@node1:/home/postgres/.ssh/id_rsa.pub2

[postgres@node1]
cat id_rsa.pub2| authorized_keys

2.6.创建源码包存储目录

在两个节点的/opt/目录下分别创建soft_bak目录用于存放软件安装包如：postgresql-9.3.5.tar.gz

mkdir /opt/soft_bak

设置相关目录的所属主

postgresql必须用postgres
用户安装，安装之前先改变postgresql的将要安装的目录的权限

chown –R postgres:postgres  /opt/soft_bak

chown –R postgres:postgres  /usr/local/

三、安装PG的依赖软件包：

yum -y install lrzsz sysstat e4fsprogs ntp readline-devel zlib zlib-devel
openssl openssl-devel pam-devel libxml2-devel libxslt-devel python-devel
tcl-devel gcc make flex bison

四、下载PostgreSQL 9.3.5 pgpool-II-3.3.3.tar.gz keepalived-1.2.15

在安装PG之前

/opt/soft_bak文件夹下应该有postgresql-9.3.5.tar.gz pgpool-II-3.4.0.tar.gz 等

五、安装PostgreSQL

主库(postgres用户安装)

cd
/opt/soft_bak/

tar zxvf
postgresql-9.3.5.tar.gz

cd
/opt/soft_bak/postgresql-9.3.5

./configure
 --with-pgport=5432 --with-perl
--with-tcl --with-python --with-openssl --with-pam --without-ldap --with-libxml
--with-libxslt --with-blocksize=8

gmake
world

gmake
install-world

备库(postgres用户安装 备节点只需要安装软件，不需要init数据库)

cd
/opt/soft_bak/

tar zxvf
postgresql-9.3.5.tar.gz

cd
/opt/soft_bak/postgresql-9.3.5

./configure
 --with-pgport=5432 --with-perl
--with-tcl --with-python --with-openssl --with-pam --without-ldap --with-libxml
--with-libxslt --with-blocksize=8

gmake
world

gmake
install-world

六、主备节点设置相关环境变量(主备节点应该一致)

vi
/home/postgres/.bash_profile

export PGPORT=5432

export
PGDATA=/file/data

export
LANG=en_US.utf8

export
PGHOME=/usr/local/pgsql

export
LD_LIBRARY_PATH=$PGHOME/lib:/lib64:/usr/lib64:/usr/local/lib64:/lib:/usr/lib:/usr/local/lib:$LD_LIBRARY_PATH

export DATE=`date
+"%Y%m%d%H%M"`

export
PATH=$PGHOME/bin:$PATH:.

export
MANPATH=$PGHOME/share/man:$MANPATH

export
PGUSER=postgres

export
PGHOST=$PGDATA

export
PGDATABASE=postgres

alias rm='rm -i'

alias ll='ls -lh'

在/home/postgres/目录下创建.pgpass(用于主备之间数据传输的流复制用户)

格式：

IP：端口：replication:用户：密码

(master)(在不创建replica用户的情况下可以使用postgres用户和postgres用户的密码)

192.168.100.3:5432:replication:replica:replica

192.168.2.4:5432:replication:replica:replica

(standby) (在不创建replica用户的情况下可以使用postgres用户和postgres用户的密码)

192.168.100.3:5432:replication:replica:replica

192.168.2.4:5432:replication:replica:replica

七、主节点初始化postgreSQL实例

su - postgres

initdb -D $PGDATA -E UTF8 --locale=C -U postgres -W

八、PostgreSQL配置文件调整

cd $PGDATA

vi postgresql.conf

listen_addresses = '0.0.0.0'

max_connections = 1000

superuser_reserved_connections = 13

unix_socket_directory = '$PGDATA'

unix_socket_permissions = 0700

tcp_keepalives_idle = 60

tcp_keepalives_interval = 10

tcp_keepalives_count = 10

shared_buffers = 2GB

maintenance_work_mem = 512MB

max_stack_depth = 8MB

vacuum_cost_delay = 10ms

vacuum_cost_limit = 10000

bgwriter_delay = 10ms

wal_level = hot_standby

wal_buffers = 16384kB
checkpoint_segments = 64

checkpoint_timeout = 5min

archive_mode = on

archive_command = '/bin/date'

max_wal_senders = 32

hot_standby = on

random_page_cost = 2.0

effective_cache_size = 12000MB

log_destination = 'csvlog'

logging_collector = on

log_directory = 'pg_log'

log_truncate_on_rotation = on

log_rotation_age = 1d

log_rotation_size = 10MB

log_min_duration_statement = 1s

log_checkpoints = on

log_lock_waits = on

deadlock_timeout = 1s

log_connections = on

log_disconnections = on

log_error_verbosity = verbose

log_statement = 'ddl'

track_activity_query_size = 2048

autovacuum = on

log_autovacuum_min_duration = 0

log_timezone = 'PRC'

datestyle = 'iso, mdy'

timezone = 'PRC'

lc_messages = 'C'

lc_monetary = 'C'

lc_numeric = 'C'

lc_time = 'C'

default_text_search_config =
'pg_catalog.english'

shared_preload_libraries =
'pg_stat_statements,auto_explain'

pg_stat_statements.max = 1000

pg_stat_statements.track = all

pg_stat_statements.track_utility = off

track_io_timing = off

custom_variable_class
= ‘pg_stat_statements,auto_explain’

pg_stat_statements.max
= 1000

pg_stat_statements.track
= all

auto_explain.log_min_duration
= 10ms

auto_explain.log_analyze
= false

auto_explain.log_verbose
= false

auto_explain.log_nested_statements
= false

九、使系统具有监控SQL功能

su -
postgres

pg_clt
–D $PGDATA start

psql –h
node1 –p 5432 –U postgres –d postgres

postgres=#create
extention pg_stat_statements;

postgres=#select
pg_stat_statements_reset();

//select
* from pg_stat_statements;

十、主备方案postgresql.conf pg_hba.conf的配置

vim postgres.conf

listen_addresses='*'

wal_level = 'hot_standby'

archive_mode = on

archive_command = 'cd ./'  # we can also use exit 0

max_wal_senders = 10

wal_keep_segments = 5000   # 80 GB required on pg_xlog

hot_standby = on

vim pg_hba.conf

host    all             all               192.168.2.4/32          trust

host    postgres        postgres          192.168.2.4/32          trust

host    replication      replica       
    192.168.2.4/32          trust

host    all             all               192.168.100.3/32        trust

host    postgres        postgres          192.168.100.3/32        trust

host    replica         replica           192.168.100.3/32        trust

十一 主备节点标志文件的配置

su –
postgres

cp
/usr/local/pgsql/share/recovery.conf.sample 
/file/data/recovery.done

standby_mode
= on

recovery_target_timeline =’latest’时间线

primary_conninfo = ‘host=node2 port=5432 user=postgres’主节点信息

trigger_file = ‘/file/data/trigger_file’

十二、生成备库实例(node2上执行)

su –
postgres

pg_basebackup –D $PGDATA –Fp –Xs –v –P –h node1
–p主库端口号 –U replica(postgres)

十三、修改备库实例的备库标识文件

cd
/file/data

mv
recovery.done recovery.conf

vim
recovery.conf

standby_mode
= on

recovery_target_timeline =’latest’时间线

primary_conninfo = ‘host=node1 port=5432
user=postgres’主节点信息

trigger_file = ‘/file/data/trigger_file’

启动备库

chmod 0700 /file/data

pg_ctl –D $PGDATA

查看备库进程

ps –ef|grep postgres

查看主库进程

ps –ef|grep postgres

十四、安装pgpool-II3.3.3(两个节点操作)

将pgpool-II3.3.3下载到/opt/soft_bak

创建pgpool的安装目录

mkdir
/opt/pgpool

su -
postgres

tar zxvf pgpool-II-3.3.3.tar.gz

cd pgpool-II-3.3.3

mkdir -p /opt/pgpool

./configure --prefix=/opt/pgpool/ --with-pgsql=/usr/local/pgsql/ --with-pgsql-libdir=/opt/pgsql/lib/ --with-pgsql-includedir=/opt/pgsql/include/

make

make install

cd src/sql

[postgres@node1 sql]$ cd pgpool_adm/

[postgres@node1 pgpool_adm]$ make

[postgres@node1 pgpool_adm]$ make install

[postgres@node1 pgpool_adm]$ cd ..

[postgres@node1 sql]$ cd pgpool-recovery/

[postgres@node1 pgpool-recovery]$ make

[postgres@node1 pgpool-recovery]$ make install

[postgres@node1 pgpool-recovery]$ cd ..

[postgres@node1 sql]$ cd pgpool-regclass/

[postgres@node1 pgpool-regclass]$ make

[postgres@node1 pgpool-regclass]$ make install

十五、安装 pgpool 相关函数

su –
postgres

cd pgpool-II-3.3.3/sql

make

make
install

cd
pgpool-recovery

make
install

cd
pgpool-regclass

make
install

echo “export PATH=\” \$PATH:/opt/pgpool/bin\”
" >>/home/postgres/.bashrc

source /home/postgres/.bashrc

安装完以后/usr/local/pgsql/share/extension/目录下应该有如下文件

pgpool_recovery--1.0.sql
pgpool_recovery.control
pgpool-recovery.sql
pgpool_regclass--1.0.sql
pgpool_regclass.control
pgpool-regclass.sql

su - postgres

psql
template1   (备节点不需要创建pgpool_regclass,pgpool_recovery)

template1=# create extension
pgpool_regclass;
CREATE EXTENSION
template1=# CREATE EXTENSION pgpool_recovery;
CREATE EXTENSION

查看新增加的  recovery 管理函数
template1=# \df
                                                    
List of functions
 Schema |       
Name         | Result data type
|                     
Argument data
types                      
|  Type  
--------+---------------------+------------------+----------------------------------------------------------------+--------
 public | pgpool_pgctl        | boolean         
| action text, stop_mode
text                                   
| normal
 public | pgpool_recovery     |
boolean          | script_name
text, remote_host text, remote_data_directory text | normal
 public | pgpool_remote_start |
boolean          | remote_host
text, remote_data_directory
text                  
| normal
 public | pgpool_switch_xlog  |
text             |
arcive_dir
text                                               
| normal
(4 rows)

十六、配置 pgpool-II ( 两节点操作)
--配置  pcp.conf

cd /opt/pgpool/etc
cp pcp.conf.sample pcp.conf
pg_md5 -u postgres -p
password: postgres
ba777e4c2f15c11ea8ac3be7e0440aa0

vim pcp.conf

--编写 pcp.conf 文件，写入以下

#
USERID:MD5PASSWD
postgres:ba777e4c2f15c11ea8ac3be7e0440aa0

--配置 ifconfig, arping 执行权限(由root用户执行)

# chmod u+s /sbin/ifconfig
# chmod u+s /usr/sbin/

--配置 pgpool.conf

cd /opt/pgpool/etc       
 
cp pgpool.conf.sample pgpool.conf

--主节点的 pgpool.conf(配置文件中的用户名和配置能用postgres用户就用postgres用户，尽量减少用户)
listen_addresses = '*'
port = 9999
socket_dir = '/opt/pgpool'
pcp_port = 9898
pcp_socket_dir = '/opt/pgpool'
backend_hostname0 = 'node1'   ##配置数据节点 node1
backend_port0 = 5432
backend_weight0 = 1
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = 'node2'   ##配置数据节点  node2
backend_port1 = 5432
backend_weight1 = 1
backend_flag1 = 'ALLOW_TO_FAILOVER'
enable_pool_hba = on
pool_passwd = 'pool_passwd'
authentication_timeout = 60
ssl = off
num_init_children = 32
max_pool = 4
child_life_time = 300
child_max_connections = 0
connection_life_time = 0
client_idle_limit = 0
log_destination = 'syslog'
print_timestamp = on
log_connections = on
log_hostname = on
log_statement = on
log_per_node_statement = off
log_standby_delay = 'none'
syslog_facility = 'LOCAL0'
syslog_ident = 'pgpool'
debug_level = 0
pid_file_name = '/opt/pgpool/pgpool.pid'
logdir = '/tmp'
connection_cache = on
reset_query_list = 'ABORT; DISCARD ALL'
replication_mode = off
replicate_select = off
insert_lock = on
lobj_lock_table = ''
replication_stop_on_mismatch = off
failover_if_affected_tuples_mismatch = off
load_balance_mode = on
ignore_leading_white_space = on
white_function_list = ''
black_function_list = 'nextval,setval'
master_slave_mode = on # 设置流复制模式
master_slave_sub_mode = 'stream' # 设置流复制模式
sr_check_period = 5
sr_check_user = 'replica'
sr_check_password = 'replica'
delay_threshold = 16000
follow_master_command = ''
parallel_mode = off
pgpool2_hostname = ''
system_db_hostname  = 'localhost'
system_db_port = 5432
system_db_dbname = 'pgpool'
system_db_schema = 'pgpool_catalog'
system_db_user = 'pgpool'
system_db_password = ''
health_check_period = 5
health_check_timeout = 20
health_check_user = 'replica'
health_check_password = 'replcia'
health_check_max_retries = 3
health_check_retry_delay = 1
failover_command = '/opt/pgpool/failover_stream.sh  %d %H /file/data/trigger_file' 
failback_command = ''
fail_over_on_backend_error = on
search_primary_node_timeout = 10
recovery_user = 'nobody'
recovery_password = ''
recovery_1st_stage_command = ''
recovery_2nd_stage_command = ''
recovery_timeout = 90
client_idle_limit_in_recovery = 0
use_watchdog = on
trusted_servers = ''
ping_path = '/bin'
wd_hostname = 'node1'
wd_port = 9000
wd_authkey = ''
delegate_IP = '' 
ifconfig_path = '/sbin'  
if_up_cmd = 'ifconfig eth0:0 inet $_IP_$ netmask 255.255.255.0'
if_down_cmd = 'ifconfig eth0:0 down'
arping_path =
'/usr/sbin'           #
arping command path
arping_cmd = 'arping -U $_IP_$ -w 1'
clear_memqcache_on_escalation = on
wd_escalation_command = ''
wd_lifecheck_method = 'heartbeat'
wd_interval = 10
wd_heartbeat_port = 9694
wd_heartbeat_keepalive = 2
wd_heartbeat_deadtime = 30
heartbeat_destination0 = 'node2'   # 配置对端的 hostname
heartbeat_destination_port0 = 9694
heartbeat_device0 = 'eth0'
wd_life_point = 3
wd_lifecheck_query = 'SELECT 1'
wd_lifecheck_dbname = 'template1'
wd_lifecheck_user = 'nobody'
wd_lifecheck_password = ''
other_pgpool_hostname0 = 'node2'   ## 配置对端的 pgpool
other_pgpool_port0 = 9999
other_wd_port0 = 9000
relcache_expire = 0
relcache_size = 256
check_temp_table = on
memory_cache_enabled = off
memqcache_method = 'shmem'
memqcache_memcached_host = 'localhost'
memqcache_memcached_port = 11211
memqcache_total_size = 67108864
memqcache_max_num_cache = 1000000
memqcache_expire = 0
memqcache_auto_cache_invalidation = on
memqcache_maxcache = 409600
memqcache_cache_block_size = 1048576
memqcache_oiddir = '/opt/pgpool/oiddir'(需要现在/opt/pgpool目录下创建oiddr)
white_memqcache_table_list = ''
black_memqcache_table_list = ''

--备节点的 pgpool.conf

pgpool.conf
listen_addresses = '*'
port = 9999
socket_dir = '/opt/pgpool'
pcp_port = 9898
pcp_socket_dir = '/opt/pgpool'
backend_hostname0 = 'node1'
backend_port0 = 5432
backend_weight0 = 1
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = 'node2'
backend_port1 = 5432
backend_weight1 = 1
backend_flag1 = 'ALLOW_TO_FAILOVER'
enable_pool_hba = on
pool_passwd = 'pool_passwd'
authentication_timeout = 60
ssl = off
num_init_children = 32
max_pool = 4
child_life_time = 300
child_max_connections = 0
connection_life_time = 0
client_idle_limit = 0
log_destination = 'syslog'
print_timestamp = on
log_connections = on
log_hostname = on
log_statement = on
log_per_node_statement = off
log_standby_delay = 'none'
syslog_facility = 'LOCAL0'
syslog_ident = 'pgpool'
debug_level = 0
pid_file_name = '/opt/pgpool/pgpool.pid'
logdir = '/tmp'
connection_cache = on
reset_query_list = 'ABORT; DISCARD ALL'
replication_mode = off
replicate_select = off
insert_lock = on
lobj_lock_table = ''
replication_stop_on_mismatch = off
failover_if_affected_tuples_mismatch = off
load_balance_mode = on
ignore_leading_white_space = on
white_function_list = ''
black_function_list = 'nextval,setval'
master_slave_mode = on
master_slave_sub_mode = 'stream'
sr_check_period = 0
sr_check_user = 'replica'
sr_check_password = 'replica'
delay_threshold = 16000
follow_master_command = ''
parallel_mode = off
pgpool2_hostname = ''
system_db_hostname  = 'localhost'
system_db_port = 5432
system_db_dbname = 'pgpool'
system_db_schema = 'pgpool_catalog'
system_db_user = 'pgpool'
system_db_password = ''
health_check_period = 0
health_check_timeout = 20
health_check_user = 'nobody'
health_check_password = ''
health_check_max_retries = 0
health_check_retry_delay = 1
failover_command = '/opt/pgpool/failover_stream.sh  %d %H /file/data/trigger/file'
failback_command = ''
fail_over_on_backend_error = on
search_primary_node_timeout = 10
recovery_user = 'nobody'
recovery_password = ''
recovery_1st_stage_command = ''
recovery_2nd_stage_command = ''
recovery_timeout = 90
client_idle_limit_in_recovery = 0
use_watchdog = off
trusted_servers = ''
ping_path = '/bin'
wd_hostname = ' '
wd_port = 9000
wd_authkey = ''
delegate_IP = ' '
ifconfig_path = '/sbin'
if_up_cmd = 'ifconfig eth0:0 inet $_IP_$ netmask 255.255.255.0'
if_down_cmd = 'ifconfig eth0:0 down'
arping_path = '/usr/sbin'          
# arping command path
arping_cmd = 'arping -U $_IP_$ -w 1'
clear_memqcache_on_escalation = on
wd_escalation_command = ''
wd_lifecheck_method = 'heartbeat'
wd_interval = 10
wd_heartbeat_port = 9694
wd_heartbeat_keepalive = 2
wd_heartbeat_deadtime = 30
heartbeat_destination0 = 'node1'
heartbeat_destination_port0 = 9694
heartbeat_device0 = 'eth0'
wd_life_point = 3
wd_lifecheck_query = 'SELECT 1'
wd_lifecheck_dbname = 'template1'
wd_lifecheck_user = 'nobody'
wd_lifecheck_password = ''
other_pgpool_hostname0 = 'node1'
other_pgpool_port0 = 9999
other_wd_port0 = 9000
relcache_expire = 0
relcache_size = 256
check_temp_table = on
memory_cache_enabled = off
memqcache_method = 'shmem'
memqcache_memcached_host = 'localhost'
memqcache_memcached_port = 11211
memqcache_total_size = 67108864
memqcache_max_num_cache = 1000000
memqcache_expire = 0
memqcache_auto_cache_invalidation = on
memqcache_maxcache = 409600
memqcache_cache_block_size = 1048576
memqcache_oiddir = '/var/log/pgpool/oiddir'
white_memqcache_table_list = ''
black_memqcache_table_list = ''

failover_stream.sh文件内容

#! /bin/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.

failed_node=$1

new_master=$2

trigger_file=$3

# Do nothing if standby goes down.

#if [ $failed_node = 1 ]; then

#        exit 0;

#fi

/usr/bin/ssh -T $new_master
/bin/touch $trigger_file

exit 0;

主节点配置

cd /opt/pgpool/etc

cp pool_hba.conf.sample pool_hba.conf

vim pool_hba.conf

host   
all             all           192.168.2.4/32        trust

host   
replication     replica       192.168.2.4/32        trust

host   
postgres        postgres      192.168.2.4/32        trust

host   
all             all           192.168.100.3/32      trust

host   
replication     replica       192.168.100.3/32      trust

host   
postgres        postgres      192.168.100.3/32      trust

host   
postgres        postgres      192.168.100.3/32      trust

host   
all             all           192.168.100.4/32      trust

host   
replication     replica       192.168.100.4/32      trust

host   
postgres        postgres      192.168.100.4/32      trust

host   
postgres        postgres      192.168.100.4/32      trust

备节点配置

cd /opt/pgpool/etc

cp pool_hba.conf.sample pool_hba.conf

vim pool_hba.conf

host    all             all           192.168.2.4/32        trust

host    replication     replica       192.168.2.4/32        trust

host    postgres        postgres      192.168.2.4/32        trust

host    all             all           192.168.100.3/32      trust

host    replication     replica       192.168.100.3/32      trust

host    postgres        postgres      192.168.100.3/32      trust

host    postgres        postgres      192.168.100.3/32      trust

host    all             all           192.168.100.4/32      trust

host    replication     replica       192.168.100.4/32      trust

host    postgres        postgres      192.168.100.4/32      trust

host    postgres        postgres      192.168.100.4/32      trust

配置密码文件(两节点操作)

su – postgres

psql

select rolname,rolpassword from
pg_authid;

vim pool_passwd

postgres:postgres的md5密码

rolname:rolpassword

pgpool启动：pgpool –n &

pgpool关闭：pgpool –m fast
stop

连接pgpool:psql –h node (or IP) –p 9999 –U postgres –d postgres

查看pgpool集群中nodes的状态

show pool_nodes;

十七、安装keepalived-1.2.15(主备两节点操作)

下载keepalived-1.2.15到/opt/sotf_bak

tar zxvf keepalived-1.2.15.tar.gz

cd keepalived-1.2.15

./configure

make

make install

node1 keepalived.conf 文件内容

global_defs {

notification_email {

acassen@firewall.loc

failover@firewall.loc

sysadmin@firewall.loc

}

notification_email_from Alexandre.Cassen@firewall.loc

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script chk_pgpool {

script "killall -0 pgpool"

interval 3

weight 2

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.100.4

}

track_script
{

chk_pgpool

}

}

node2 keepalived.conf 文件内容

global_defs {

notification_email {

acassen@firewall.loc

failover@firewall.loc

sysadmin@firewall.loc

}

notification_email_from Alexandre.Cassen@firewall.loc

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_script chk_pgpool {

script "killall -0 pgpool"

interval 3

weight 2

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 51

priority 99

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.100.4

}

track_script {

chk_pgpool

}

}

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