PostgreSQL+pgpooll+Keepalived雙機HA方案
PostgreSQL+pgpooll+Keepalived雙機HA方案node
(注:本文檔中的全部操做在沒有說明的狀況下都應該使用postgres用戶進行操做，postgres用戶沒有權限的操做方可採用root用戶進行操做，能夠在本方案中使用postgres用戶及該用戶的密碼替換replcia及replica用戶的密碼)python
方案邏輯圖linux
192.168.100.3的pgpool故障圖sql
192.168.100.4的pgpool故障圖數據庫
192.168.100.3的Master故障圖vim
1、環境信息bash
操做系統：CentOS6.6服務器
數據庫：PostgreSQL9.3.5dom
物理機兩臺：node1,node2ssh
Keepalived:keepalived-1.2.15
pgpool:pgpool-II-3.3.3
1、 安裝Linux操做系統CentOS6.6(兩臺物理機操做)
主節點：node1:IP:192.168.100.3
備節點：node2:IP:192.168.2.4
VIP：192.168.100.4
2、 安裝完Linux操做系統以後的系統調整(兩臺物理機操做)
2.1主備節點時鐘同步:
/usr/sbin/ntpdate asia.pool.ntp.org && /sbin/hwclock –systohc
2.2給兩個機器分別命名：node1,node2
第一臺機器命名爲node1
2.2.1 修改/etc/sysconfig/network中的hostname
vi /etc/sysconfig/network
HOSTNAME=node1 #修改localhost.localdomain爲node1
2.2.2 修改/etc/hosts文件
vi /etc/hosts
127.0.0.1 node1 localhost #修改localhost.localdomain爲node1
shutdown -r now #最後，重啓服務器便可
第二臺機器命名爲node2
2.2.3 修改/etc/sysconfig/network中的hostname
vi /etc/sysconfig/network
HOSTNAME=node2 #修改localhost.localdomain爲node2
2.2.4 修改/etc/hosts文件
vi /etc/hosts
127.0.0.1 node2 localhost #修改localhost.localdomain爲node2
shutdown -r now #最後，重啓服務器便可。
2.3.OS資源調整
時區調整: (若是已經調好同步不須要作)
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
防火牆根據須要配置
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.給兩個節點分別建立postgres用戶並設置密碼
useradd postgres
password：postgres
2.5.配置兩臺機器的ssh免密鑰登陸
[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.建立源碼包存儲目錄
在兩個節點的/opt/目錄下分別建立soft_bak目錄用於存放軟件安裝包如：postgresql-9.3.5.tar.gz
mkdir /opt/soft_bak
設置相關目錄的所屬主
postgresql必須用postgres 用戶安裝，安裝以前先改變postgresql的將要安裝的目錄的權限
chown –R postgres:postgres /opt/soft_bak
chown –R postgres:postgres /usr/local/
3、安裝PG的依賴軟件包：
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
4、下載PostgreSQL 9.3.5 pgpool-II-3.3.3.tar.gz keepalived-1.2.15
在安裝PG以前
/opt/soft_bak文件夾下應該有postgresql-9.3.5.tar.gz pgpool-II-3.4.0.tar.gz 等
5、安裝PostgreSQL
主庫(postgres用戶安裝)
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
備庫(postgres用戶安裝 備節點只須要安裝軟件，不須要init數據庫)
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
6、主備節點設置相關環境變量(主備節點應該一致)
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/目錄下建立.pgpass(用於主備之間數據傳輸的流複製用戶)
格式：
IP：端口：replication:用戶：密碼
(master)(在不建立replica用戶的狀況下可使用postgres用戶和postgres用戶的密碼)
192.168.100.3:5432:replication:replica:replica
192.168.2.4:5432:replication:replica:replica
(standby) (在不建立replica用戶的狀況下可使用postgres用戶和postgres用戶的密碼)
192.168.100.3:5432:replication:replica:replica
192.168.2.4:5432:replication:replica:replica
7、主節點初始化postgreSQL實例
su - postgres
initdb -D $PGDATA -E UTF8 --locale=C -U postgres -W
8、PostgreSQL配置文件調整
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
9、使系統具備監控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;
10、主備方案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 主備節點標誌文件的配置
su – postgres
cp /usr/local/pgsql/share/recovery.conf.sample /file/data/recovery.done
standby_mode = on
recovery_target_timeline =’latest’時間線
primary_conninfo = ‘host=node2 port=5432 user=postgres’主節點信息
trigger_file = ‘/file/data/trigger_file’
12、生成備庫實例(node2上執行)
su – postgres
pg_basebackup –D $PGDATA –Fp –Xs –v –P –h node1 –p主庫端口號 –U replica(postgres)
十3、修改備庫實例的備庫標識文件
cd /file/data
mv recovery.done recovery.conf
vim recovery.conf
standby_mode = on
recovery_target_timeline =’latest’時間線
primary_conninfo = ‘host=node1 port=5432 user=postgres’主節點信息
trigger_file = ‘/file/data/trigger_file’
啓動備庫
chmod 0700 /file/data
pg_ctl –D $PGDATA
查看備庫進程
ps –ef|grep postgres
查看主庫進程
ps –ef|grep postgres
十4、安裝pgpool-II3.3.3(兩個節點操做)
將pgpool-II3.3.3下載到/opt/soft_bak
建立pgpool的安裝目錄
mkdir /opt/pgpool
su - postgres
tar zxvf pgpool-II-3.3.3.tar.gz
cd pgpool-II-3.3.3
mkdir -p /opt/pgpool
./configure --prefix=/opt/pgpool/ --with-pgsql=/usr/local/pgsql/ --with-pgsql-libdir=/opt/pgsql/lib/ --with-pgsql-includedir=/opt/pgsql/include/
make
make install
cd src/sql
[postgres@node1 sql]$ 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
十5、安裝 pgpool 相關函數
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
安裝完之後/usr/local/pgsql/share/extension/目錄下應該有以下文件
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 (備節點不須要建立pgpool_regclass,pgpool_recovery)
template1=# create extension pgpool_regclass;
CREATE EXTENSION
template1=# CREATE EXTENSION pgpool_recovery;
CREATE EXTENSION
查看新增長的 recovery 管理函數
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)
十6、配置 pgpool-II ( 兩節點操做)
--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
--編寫 pcp.conf 文件，寫入如下
# USERID:MD5PASSWD
postgres:ba777e4c2f15c11ea8ac3be7e0440aa0
--配置 ifconfig, arping 執行權限(由root用戶執行)
# chmod u+s /sbin/ifconfig
# chmod u+s /usr/sbin/
--配置 pgpool.conf
cd /opt/pgpool/etc
cp pgpool.conf.sample pgpool.conf
--主節點的 pgpool.conf(配置文件中的用戶名和配置能用postgres用戶就用postgres用戶，儘可能減小用戶)
listen_addresses = '*'
port = 9999
socket_dir = '/opt/pgpool'
pcp_port = 9898
pcp_socket_dir = '/opt/pgpool'
backend_hostname0 = 'node1' ##配置數據節點 node1
backend_port0 = 5432
backend_weight0 = 1
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = 'node2' ##配置數據節點 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 # 設置流複製模式
master_slave_sub_mode = 'stream' # 設置流複製模式
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' # 配置對端的 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' ## 配置對端的 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'(須要如今/opt/pgpool目錄下建立oiddr)
white_memqcache_table_list = ''
black_memqcache_table_list = ''
--備節點的 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文件內容
#! /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;
主節點配置
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
備節點配置
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
配置密碼文件(兩節點操做)
su – postgres
psql
select rolname,rolpassword from pg_authid;
vim pool_passwd
postgres:postgres的md5密碼
rolname:rolpassword
pgpool啓動：pgpool –n &
pgpool關閉：pgpool –m fast stop
鏈接pgpool:psql –h node (or IP) –p 9999 –U postgres –d postgres
查看pgpool集羣中nodes的狀態
show pool_nodes;
十7、安裝keepalived-1.2.15(主備兩節點操做)
下載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 文件內容
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 文件內容
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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