如何下載POSTGRESQL源碼安裝包及實現主機配置

這篇文章將為大家詳細講解有關如何下載POSTGRESQL源碼安裝包及實現主機配置，小編覺得挺實用的，因此分享給大家做個參考，希望大家閱讀完這篇文章后可以有所收獲。

一、下載POSTGRESQL源碼安裝包及主機配置
https://www.postgresql.org/ftp/source/v10.3/
postgresql-10.3.tar.gz

虛擬機環境
node1  192.168.159.151
node2  192.168.159.152

操作系統為redhat6.5
數據庫為postgresql10.3

兩個節點均配置/etc/hosts
vi /etc/hosts
node1  192.168.159.151
node2  192.168.159.152
二、編譯安裝
（1）創建postgres用戶
useradd -m -r -s /bin/bash -u 5432 postgres
（2）安裝相關依賴包
yum install gettext gcc make perl python perl-ExtUtils-Embed   readline-devel   zlib-devel    openssl-devel   libxml2-devel  cmake  gcc-c++ libxslt-devel  openldap-devel  pam-devel  python-devel  cyrus-sasl-devel  libgcrypt-devel  libgpg-error-devel  libstdc++-devel

（3）配置POSTGRES
./configure --prefix=/opt/postgresql-10.3 --with-segsize=8 --with-wal-segsize=64 --with-wal-blocksize=16 --with-blocksize=16 --with-libedit-preferred --with-perl --with-python --with-openssl --with-libxml --with-libxslt --enable-thread-safety --enable-nls=zh_CN

最后幾行出現以下黃色輸出即配置正確，否則根據報錯提示繼續安裝依賴包
configure: using CPPFLAGS= -D_GNU_SOURCE -I/usr/include/libxml2 
configure: using LDFLAGS=  -Wl,--as-needed
configure: creating ./config.status
config.status: creating GNUmakefile
config.status: creating src/Makefile.global
config.status: creating src/include/pg_config.h
config.status: creating src/include/pg_config_ext.h
config.status: creating src/interfaces/ecpg/include/ecpg_config.h
config.status: linking src/backend/port/tas/dummy.s to src/backend/port/tas.s
config.status: linking src/backend/port/dynloader/linux.c to src/backend/port/dynloader.c
config.status: linking src/backend/port/posix_sema.c to src/backend/port/pg_sema.c
config.status: linking src/backend/port/sysv_shmem.c to src/backend/port/pg_shmem.c
config.status: linking src/backend/port/dynloader/linux.h to src/include/dynloader.h
config.status: linking src/include/port/linux.h to src/include/pg_config_os.h
config.status: linking src/makefiles/Makefile.linux to src/Makefile.port

（4）編譯
make && make install

最后幾行出現以下黃色輸出即配置正確
make[1]: Leaving directory `/opt/postgresql-10.3/src'
make -C config install
make[1]: Entering directory `/opt/postgresql-10.3/config'
/bin/mkdir -p '/opt/postgresql-10.3/lib/pgxs/config'
/usr/bin/install -c -m 755 ./install-sh '/opt/postgresql-10.3/lib/pgxs/config/install-sh'
/usr/bin/install -c -m 755 ./missing '/opt/postgresql-10.3/lib/pgxs/config/missing'
make[1]: Leaving directory `/opt/postgresql-10.3/config'
PostgreSQL installation complete.

（5）安裝
make world && make install -world

最后幾行出現以下黃色輸出即配置正確
make[1]: Leaving directory `/opt/postgresql-10.3/src'
make -C config install
make[1]: Entering directory `/opt/postgresql-10.3/config'
/bin/mkdir -p '/opt/postgresql-10.3/lib/pgxs/config'
/usr/bin/install -c -m 755 ./install-sh '/opt/postgresql-10.3/lib/pgxs/config/install-sh'
/usr/bin/install -c -m 755 ./missing '/opt/postgresql-10.3/lib/pgxs/config/missing'
make[1]: Leaving directory `/opt/postgresql-10.3/config'
PostgreSQL installation complete.
make: Leaving directory `/opt/postgresql-10.3'

（6）創建相關目錄及配置環境變量
mkdir -p /data/pgdata/serverlog
mkdir /data/pg
su - postgres
vi .bash_profile  （刪除原來的所有，以下黃色部分直接復制粘貼）
# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi

# User specific environment and startup programs
PATH=$PATH:$HOME/bin
export PATH

# postgres
#PostgreSQL端口
PGPORT=5432

#PostgreSQL數據目錄
PGDATA=/data/pgdata
export PGPORT PGDATA 

#所使用的語言
export LANG=zh_CN.utf8

#PostgreSQL 安裝目錄
export PGHOME=/data/pg

#PostgreSQL 連接庫文件
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"`

#將PostgreSQL的命令行添加到 PATH 環境變量
export PATH=$PGHOME/bin:$PATH

#PostgreSQL的 man 手冊
export MANPATH=$PGHOME/share/man:$MANPATH

#PostgreSQL的默認用戶
export PGUSER=postgres

#PostgreSQL默認主機地址
export PGHOST=127.0.0.1

#默認的數據庫名
export PGDATABASE=postgres

#定義日志存放目錄
PGLOG="$PGDATA/serverlog"source .bash_profile

（7）初始化數據庫
#執行數據庫初始化腳本
root用戶登錄
chown -R postgres.postgres /data/
su - postgres
$/opt/postgresql-10.3/bin/initdb --encoding=utf8 -D /data/pg/data 警告:為本地連接啟動了 "trust" 認證.
你可以通過編輯 pg_hba.conf 更改或你下次
行 initdb 時使用 -A或者--auth-local和--auth-host選項. Success. You can now start the database server using: 啟動數據庫
su - postgres
/opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data -l logfile start
（8）相關命令拷貝
root用戶
mkdir /data/pg/bin
cp /opt/postgresql-10.3/bin/*  /data/pg/bin
chown -R postgres.postgres /data/pg/bin


三、postgresql主從搭建

1、主庫配置

（1）創建一個用戶復制的用戶replica
su - postgres

psql

CREATE ROLE replica login replication encrypted password 'replica';

（2）修改pg_hba.conf文件，指定replica登錄網絡(最后一添加)

vi /data/pg/data/pg_hba.conf

host    replication     replica            192.168.159.0/24         md5
host    all          replica           192.168.159.0/24         trust

 
（3）主庫配置文件修改以下幾項，其他不變
vi /data/pg/data/postgresql.conf
listen_addresses = '*'
wal_level = hot_standby  #熱備模式
max_wal_senders= 6 #可以設置最多幾個流復制鏈接，差不多有幾個從，就設置多少
wal_keep_segments = 10240  #重要配置
wal_send_timeout = 60s
max_connections = 512 #從庫的 max_connections要大于主庫
archive_mode = on #允許歸檔
archive_command = 'cp %p /data/pg/data/archive/%f'   #根據實際情況設置

checkpoint_timeout = 30min
max_wal_size = 3GB
min_wal_size = 64MB

mkdir /data/pg/data/archive

2、從庫環境

（1）把備庫的數據文件夾目錄清空

rm -rf /var/lib/pgsql/10/data/*

（2）在備庫上運行

pg_basebackup -F p --progress -D /data/pg/data/ -h 192.168.159.151 -p 5432 -U replica --password

輸入密碼replica 

！！！注意，復制完成后，在備庫一定要將數據目錄下的所有文件重新授權

chown -R postgres.postgres /data/pg/data/

（3）創建recovery.conf 文件

cp  /opt/postgresql-10.3/share/recovery.conf.sample /data/pg/data/recovery.conf

vi /data/pg/data/recovery.conf

standby_mode = on

primary_conninfo = 'host=192.168.159.151 port=5432 user=replica password=replica'

recovery_target_timeline = 'latest'

trigger_file = '/data/pg/data/trigger.kenyon'

（4）配置postgresql.conf文件
vi /data/pg/data/postgresql.conf
listen_addresses ='*'

wal_level = hot_standby

max_connections =1000 #一般從的最大鏈接要大于主的

hot_standby =on  #說明這臺機器不僅僅用于數據歸檔，也用于查詢

max_standby_streaming_delay =30s

wal_receiver_status_interval = 10s  #多久向主報告一次從的狀態

hot_standby_feedback = on   #如果有錯誤的數據復制，是否向主進行范例

（5）啟動備庫

su - postgres
/opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data/ -l logfile start

如果無法啟動，到主庫復制文件postmaster.opts到備庫如下操作：

scp /data/pg/data/postmaster.opts 192.168.159.152:/data/pg/data/

chown -R postgres.postgres /data/pg/data/
cd /data/pg/

chmod 700 data/

3、驗證主從功能

主庫查詢

su - postgres

psql

postgres=# select client_addr,sync_state from pg_stat_replication;

   client_addr   | sync_state

-----------------+------------

 192.168.159.152 | async

(1 row)

發現登陸postgres時出現以下問題
-bash-4.1$ 
root用戶執行
cp /etc/skel/.bash* /var/lib/pgsql/
再次登陸即可變成
[postgres@node1 ~]$4、手動主備切換

（1）創建備庫recovery.conf 文件（ 在備庫上操作192.168.159.152）

  cp $PGHOME/share/recovery.conf.sample $PGDATA/recovery.conf

配置以下參數  

standby_mode = 'on'  --標記PG為STANDBY SERVER

primary_conninfo = 'host=192.168.159.151  port=5432 user=replica password=replica'   --標識主庫信息

trigger_file = '/data/pg/data/trigger.kenyon'     --標識觸發器文件

（2） 關閉主庫（在主庫上操作192.168.159.151）

/opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data/ -l logfile stop

（3）激活備庫到主庫狀態 ( 在備庫上操作192.168.159.152 )

   激活備庫只要創建一個文件即可，根據備庫 recovery.conf 配置文件的參數 trigger_file 值，

  創建這個 trigger 文件即可。 例如 "touch /data/pg/data/trigger.kenyon"

touch /data/pg/data/trigger.kenyon

過一會兒發現 recovery.conf 文件變成 recovery.done ，說明備庫已經激活。

查看logfile日志，出現以下信息即激活
2018-06-04 21:11:01.137 PDT [12818] 日志:  已找到觸發器文件:/data/pg/data/trigger.kenyon
2018-06-04 21:11:01.148 PDT [12818] 日志:  redo 在 0/C02A390 完成
2018-06-04 21:11:01.172 PDT [12818] 日志:  已選擇的新時間線ID：2
2018-06-04 21:11:05.442 PDT [12818] 日志:  歸檔恢復完畢
2018-06-04 21:11:05.568 PDT [12817] 日志:  數據庫系統準備接受連接

（4）修改原來主庫的配置文件
vi /data/pg/data/postgresql.conf
max_connections = 1500  #從庫值要比主庫值大

（5）激活原來的主庫，讓其轉變成從庫  (在原來的主庫上執行192.168.159.151) 

--創建 $PGDATA/recovery.conf 文件，配置以下參數
vi /data/pg/data/recovery.conf

recovery_target_timeline = 'latest'

standby_mode = 'on'  #--標記PG為STANDBY SERVER

primary_conninfo = 'host=192.168.159.152 port=5432 user=replica password=replica'   #--標識主庫信息

trigger_file = '/data/pg/data/trigger.kenyon'     #--標識觸發器文件

--修改 pg_hba.conf (現在的主庫上增加192.168.159.152)，添加以下配置
vi /data/pg/data/pg_hba.conf

host   replication     replica          192.168.159.151/32         md5

啟動原來的主庫即現在的從庫(192.168.159.151)
/opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data/ -l logfile start

查看現在的從庫logfile日志發現報錯信息
2018-06-05 00:08:00.326 PDT [9729] 詳細信息:  WAL結束時，到了時間線1和地址0/C02A400.
2018-06-05 00:08:00.327 PDT [9725] 日志:  在當前恢復點0/C02A630之前, 新的時間點2脫離了當前茅的數據庫系統時間點1
2018-06-05 00:08:05.322 PDT [9729] 日志:  在0/C000000處時間線1上重啟WAL流操作
2018-06-05 00:08:05.327 PDT [9729] 日志:  復制由主用服務器終止
2018-06-05 00:08:05.327 PDT [9729] 詳細信息:  WAL結束時，到了時間線1和地址0/C02A400.
2018-06-05 00:08:05.329 PDT [9725] 日志:  在當前恢復點0/C02A630之前, 新的時間點2脫離了當前茅的數據庫系統時間點1
2018-06-05 00:08:10.328 PDT [9729] 日志:  在0/C000000處時間線1上重啟WAL流操作
2018-06-05 00:08:10.332 PDT [9729] 日志:  復制由主用服務器終止
2018-06-05 00:08:10.332 PDT [9729] 詳細信息:  WAL結束時，到了時間線1和地址0/C02A400.
2018-06-05 00:08:10.333 PDT [9725] 日志:  在當前恢復點0/C02A630之前, 新的時間點2脫離了當前茅的數據庫系統時間點1

在現在的主庫操作：
scp /data/pg/data/pg_wal/00000002.history 192.168.159.151:/data/pg/data/pg_wal/

(6)兩個節點都操作
vi /data/pg/data/recovery.conf
restore_command = 'cp /data/pg/data/archive/%f %p'

mkdir /data/pg/data/archive
chown postgres.postgres /data/pg/data/archive

vi /data/pg/data/postgresql.conf
archive_command = 'cp %p /data/pg/data/archive/%f' 

四、安裝PGPOOL
（1）配置兩臺機器的ssh免密鑰登錄
1節點
[postgres@node1]$ ssh-keygen -t rsa
全部回車默認
[postgres@node1]$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
[postgres@node1]$ chmod go-rwx ~/.ssh/*
[postgres@node1]$ cd ~/.ssh 2節點
[postgres@node2$ ssh-keygen -t rsa
全部回車默認
[postgres@node2$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
[postgres@node2$ chmod go-rwx ~/.ssh/*
[postgres@node2] cd ~/.ssh 1節點
[postgres@node1]$ scp id_rsa.pub 192.168.159.152:/home/postgres/.ssh/id_rsa.pub1
2節點
[postgres@node2] cat id_rsa.pub1 >> authorized_keys
[postgres@node2]scp id_rsa.pub 192.168.159.151:/home/postgres/.ssh/id_rsa.pub2
1節點
[postgres@node1] cat id_rsa.pub2  >> authorized_keys （2）安裝pgpool ii
安裝pgpool ii 
yum -y  install libmemcached  postgresql-libs.x86_64  openssl098e    
（這里注意一定要先安裝這些YUM源，不然死活安裝不了pgpool II）
rpm -ivh pgpool-II-pg10-3.7.2-1pgdg.rhel6.x86_64.rpm pg_md5 -u postgres -p
密碼設置為postgres
輸出的密碼編碼為
e8a48653851e28c69d0506508fb27fc5

vi /etc/pgpool-II/pcp.conf  #最后一行添加
postgres:e8a48653851e28c69d0506508fb27fc5

mkdir -p /opt/pgpool/oiddir
cp /etc/pgpool-II/pgpool.conf /etc/pgpool-II/pgpool.conf.bak ifconfig查看下網卡
[root@node1 pgpool-II]# ifconfig
eth2      Link encap:Ethernet  HWaddr 00:0C:29:9E:E8:6D  
          inet addr:192.168.159.152  Bcast:192.168.159.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe9e:e86d/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14557 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10820 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1889055 (1.8 MiB)  TX bytes:1485329 (1.4 MiB) lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:5029 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5029 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:2786891 (2.6 MiB)  TX bytes:2786891 (2.6 MiB)

注意：這里我的網卡是eth2，所以，下面2個節點的黃色字體配置要相應變化
如果網卡配置不正確，會報類似這樣的報錯arping: unknown iface eth0

1節點
vi /etc/pgpool-II/pgpool.conf
listen_addresses = '*'
port = 9999
socket_dir = '/opt/pgpool'
pcp_port = 9898
pcp_socket_dir = '/opt/pgpool'
backend_hostname0 = '192.168.159.151'   ##配置數據節點 node1
backend_port0 = 5432
backend_weight0 = 1
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = '192.168.159.152'   ##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 # 設置流復制模式
master_slave_sub_mode = 'stream' # 設置流復制模式
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 /data/pg/data/trigger.kenyon'  
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 = '192.168.159.151'
wd_port = 9000
wd_authkey = ''
delegate_IP = '192.168.159.153' 
ifconfig_path = '/sbin'  
if_up_cmd = 'ifconfig eth2:0 inet $_IP_$ netmask 255.255.255.0'
if_down_cmd = 'ifconfig eth2:0 down'
arping_path = '/usr/sbin'           # arping command path
arping_cmd = 'arping -I eth2 -U $_IP_$ -w 1'   #-I eth2指定出口網卡
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 = '192.168.159.152'   # 配置對端的 hostname
heartbeat_destination_port0 = 9694 
heartbeat_device0 = 'eth2' 
wd_life_point = 3
wd_lifecheck_query = 'SELECT 1'
wd_lifecheck_dbname = 'template1'
wd_lifecheck_user = 'nobody'
wd_lifecheck_password = ''
other_pgpool_hostname0 = '192.168.159.152'   ## 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'#(需要現在/opt/pgpool目錄下創建oiddr)
white_memqcache_table_list = ''
black_memqcache_table_list = '' 2節點
vi  /etc/pgpool-II/pgpool.conf

listen_addresses = '*'
port = 9999
socket_dir = '/opt/pgpool'
pcp_port = 9898
pcp_socket_dir = '/opt/pgpool'
backend_hostname0 = '192.168.159.151'
backend_port0 = 5432
backend_weight0 = 1
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = '192.168.159.152'
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 = '192.168.159.153'
ifconfig_path = '/sbin'
if_up_cmd = 'ifconfig eth2:0 inet $_IP_$ netmask 255.255.255.0'
if_down_cmd = 'ifconfig eth2:0 down'
arping_path = '/usr/sbin'           # arping command path
arping_cmd = 'arping -I eth2 -U $_IP_$ -w 1'   #-I eth2指定出口網卡
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 = '192.168.159.151'
heartbeat_destination_port0 = 9694 
heartbeat_device0 = 'eth2'
wd_life_point = 3
wd_lifecheck_query = 'SELECT 1'
wd_lifecheck_dbname = 'template1'
wd_lifecheck_user = 'nobody'
wd_lifecheck_password = ''
other_pgpool_hostname0 = '192.168.159.152'
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'
white_memqcache_table_list = ''
black_memqcache_table_list = ''

vi /opt/pgpool/failover_stream.sh
#! /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; 給腳本授權
chmod u+x /opt/pgpool/failover_stream.sh

scp /opt/pgpool/failover_stream.sh 192.168.159.152:/opt/pgpool/ cp /etc/pgpool-II/pool_hba.conf /etc/pgpool-II/pool_hba.conf.bak
vi /etc/pgpool-II/pool_hba.conf
host    all             all           192.168.159.151/32        trust
host    replication     replica       192.168.159.151/32        trust
host    postgres        postgres      192.168.159.151/32        trust
host    all             all           192.168.159.152/32      trust
host    replication     replica       192.168.159.152/32      trust
host    postgres        postgres      192.168.159.152/32      trust
host    postgres        postgres      192.168.159.152/32      trust
host    all             all           192.168.159.153/32      trust
host    replication     replica       192.168.159.153/32      trust
host    postgres        postgres      192.168.159.153/32      trust
host    postgres        postgres      192.168.159.153/32      trust 注意192.168.159.153 是VIP地址   scp /etc/pgpool-II/pool_hba.conf 192.168.159.140:/etc/pgpool-II/

啟動pgpool
pgpool -n & 關閉pgpool
pgpool -m fast stop

登陸pgpool
/data/pg/bin/psql -h 192.168.159.151 -p 9999 -U postgres -d postgres

也可以用VIP登陸/data/pg/bin/psql -h 192.168.159.153 -p 9999 -U postgres -d postgres

查看pgpool節點
show pool_nodes;
postgres=# show pool_nodes;
 node_id |    hostname     | port | status | lb_weight |  role   | select_cnt | load_balance_node | replication_delay 
---------+-----------------+------+--------+-----------+---------+------------+-------------------+-------------------
 0       | 192.168.159.151 | 5432 | up     | 0.500000  | primary | 0          | true              | 0
 1       | 192.168.159.152 | 5432 | down   | 0.500000  | standby | 0          | false             | 0
(2 rows)

五、安裝keepalive
tar xvf keepalived-1.4.2.tar.gz
cd keepalived-1.4.2
./configure
make
make install
mkdir /etc/keepalived
cd /etc/keepalived/
1節點：
vi /etc/keepalived/keepalived.conf
global_defs {  
    router_id node1 
}  
vrrp_instance VI_1 {  
    state BACKUP    #設置為主服務器  
    interface eth2:0  #監測網絡接口  
    virtual_router_id 51  #主、備必須一樣  
    priority 100   #(主、備機取不同的優先級，主機值較大，備份機值較小,值越大優先級越高)  
    advert_int 1   #VRRP Multicast廣播周期秒數  
    authentication {  
    auth_type PASS  #VRRP認證方式，主備必須一致  
    auth_pass 1111   #(密碼)  
}  
virtual_ipaddress {  
    192.168.159.153/24  #VRRP HA虛擬地址  
}  

2節點：
vi /etc/keepalived/keepalived.conf
global_defs {  
    router_id node2 
}  
vrrp_instance VI_1 {  
    state BACKUP    #設置為主服務器  
    interface eth2:0  #監測網絡接口  
    virtual_router_id 51  #主、備必須一樣  
    priority 90   #(主、備機取不同的優先級，主機值較大，備份機值較小,值越大優先級越高)  
    advert_int 1   #VRRP Multicast廣播周期秒數  
    authentication {  
    auth_type PASS  #VRRP認證方式，主備必須一致  
    auth_pass 1111   #(密碼)  
}  
virtual_ipaddress {  
    192.168.159.153/24  #VRRP HA虛擬地址  
}  

啟動Keepalived
keepalived -D -f /etc/keepalived/keepalived.conf

查看日志
tail -f /var/log/message

查看進程
ps -ef|grep keepalive

！！！！！注意！！！！！！！  配置PGPOOL的高可用，以下內容為本人親測，部分關鍵性資料是自己摸索編寫的，網上找不到資料
1、設置相關權限（兩個節點都要執行）
--配置 ifconfig, arping 執行權限  root用戶下執行
chmod u+s /sbin/ifconfig
chmod u+s /sbin/ifdown
chmod u+s /sbin/ifup
chmod u+s /usr/sbin/
chmod 755 /opt/pgpool/failover_stream.sh
chown postgres.root /opt/pgpool/failover_stream.sh 2、配置PGPOOL日志（兩個節點都要執行）最后一行添加
vi /etc/rsyslog.conf
local0.*    /var/log/pgpool.log

/etc/init.d/rsyslog restart 3、配置關鍵腳本failover_stream.sh（兩個節點都要執行）
將原來的那個ssh那行刪除或注釋
主庫是192.168.159.151時
vi  /opt/pgpool/failover_stream.sh
ifconfig eth2:0 down
/usr/bin/ssh 192.168.159.152 /bin/touch /data/pg/data/trigger.kenyon
/usr/bin/ssh 192.168.159.152 ifconfig eth2:0 up

主庫是192.168.159.152時
vi  /opt/pgpool/failover_stream.sh
ifconfig eth2:0 down
/usr/bin/ssh 192.168.159.151 /bin/touch /data/pg/data/trigger.kenyon
/usr/bin/ssh 192.168.159.151 ifconfig eth2:0 up
4、復制一個eth2:0的網卡（兩個節點都要執行）
cd /etc/sysconfig/network-scripts/

cp ifcfg-eth2 ifcfg-eth2:0

vi ifcfg-eth2:0
DEVICE="eth2:0"
BOOTPROTO="static"
HWADDR="00:0c:29:0c:7d:4f"
IPV6INIT="yes"
NM_CONTROLLED="yes"
ONBOOT="yes"
TYPE="Ethernet"
#UUID="e618ec6a-8bb0-4202-8fe6-54febd0f8c76"
IPADDR=192.168.159.153
NETMASK=255.255.255.0
GATEWAY=192.168.159.1

5、修改pgpool.conf配置文件
vi /etc/pgpool-II/pgpool.conf
failover_command = '/opt/pgpool/failover_stream.sh'

將原來的那行注釋掉，用這種方式就可以了

6、修改 pgpool.conf配置文件
vi  /etc/pgpool-II/pgpool.conf
heartbeat_device0 = 'eth2:0'

在本文上面的第三大點的第四小點有手動主備切換的步驟

VIP暫時還是不能自動漂浮切換，但是可以手動切換主備（按上面的配置會出現兩個節點都有VIP192.168.159.153，這就很奇怪）
目前手動切換主備，可以實現VIP自動漂浮切換，但是前提條件是pgpool必須停止，比如主節點的postgresql數據庫實例停止了，那同時主節點pgpool也要停止，這樣過幾分鐘左右，從節點的vip192.168.159.153就會自動起來。
一定要注意的是，主備切換動作完成后，要用命令查看及測試切換是否成功，比如登陸
/data/pg/bin/psql -h 192.168.159.153 -p 9999 -U postgres -d postgres
show pool_nodes;
select client_addr,sync_state from pg_stat_replication;
這些查到的信息確認正確后，再嘗試create一個測試table看是否能夠創建
create table test123 (tt int); 注意，在/data/pg/data/gprof目錄下，有很多的一些二進制文件，不知道是什么，會占用大量的存儲空間。請教大神指導，哈哈PG主從+pgpool ii 搭建完成后 相關報錯
1、PG無法登陸問題
原本第一步搭建好PG主從，測試主從同步功能，登陸都沒問題
但是在后續安裝配置pgpool ii 高可用的時候，突然發現PG無法登陸了，報錯如下：
[postgres@node1 ~]$ psql
psql: symbol lookup error: psql: undefined symbol: PQconnectdbParams

因為啟動PG的時候是有執行日志的
[postgres@node1 ~]$ /opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data -l logfile start
可以在postgres家目錄查看logfile日志報錯信息：
2018-05-31 23:00:18.703 PDT [12734] 致命錯誤:  無法加載庫 "/opt/postgresql-10.3/lib/libpqwalreceiver.so": /opt/postgresql-10.3/lib/libpqwalreceiver.so: undefined symbol: PQescapeIdentifier
2018-05-31 23:00:23.709 PDT [12736] 致命錯誤:  無法加載庫 "/opt/postgresql-10.3/lib/libpqwalreceiver.so": /opt/postgresql-10.3/lib/libpqwalreceiver.so: undefined symbol: PQescapeIdentifier
2018-05-31 23:00:28.715 PDT [12737] 致命錯誤:  無法加載庫 "/opt/postgresql-10.3/lib/libpqwalreceiver.so": /opt/postgresql-10.3/lib/libpqwalreceiver.so: undefined symbol: PQescapeIdentifier
2018-05-31 23:00:33.721 PDT [12738] 致命錯誤:  無法加載庫 "/opt/postgresql-10.3/lib/libpqwalreceiver.so": /opt/postgresql-10.3/lib/libpqwalreceiver.so: undefined symbol: PQescapeIdentifier
2018-05-31 23:00:38.730 PDT [12739] 致命錯誤:  無法加載庫 "/opt/postgresql-10.3/lib/libpqwalreceiver.so": /opt/postgresql-10.3/lib/libpqwalreceiver.so: undefined symbol: PQescapeIdentifier 這個時候，可以臨時執行
export LD_LIBRARY_PATH=/opt/postgresql-10.3/lib/libpqwalreceiver.so
加載缺失的庫文件，再重新啟動PG就可以登錄了

想要永久的解決，如下：
vi  ~/.bash_profile
在最后一行添加
export LD_LIBRARY_PATH=/opt/postgresql-10.3/lib/libpqwalreceiver.so2、PGPOOL無法啟動問題
使用命令pgpool -n & 啟動pgpool，發現無法啟動
[root@node1 ~]# ps -ef|grep pgpool
root      3163  3081  0 19:57 pts/0    00:00:00 pgpool -n
root      3205  3163  0 19:57 pts/0    00:00:00 pgpool: health check process(0)
root      3206  3163  0 19:57 pts/0    00:00:02 pgpool: health check process(1)
root      4505  4455  0 20:37 pts/1    00:00:00 grep pgpool
ps命令查看pgpool進程，發現存在殘留進程
kill 3205
kill 3206
再次啟動pgpool成功

成功啟動的pgpool是以下這樣的
[root@node1 ~]# ps -ef|grep pool
root     12828  2231  0 19:58 pts/0    00:00:00 pgpool -n
root     12829 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12830 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12831 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12832 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12833 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12834 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12835 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12836 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12837 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12838 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12839 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12840 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12841 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12842 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12843 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12844 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12845 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12846 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12847 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12848 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12849 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12850 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12851 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12852 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12853 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12854 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12855 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12856 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12857 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12858 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12859 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12860 12828  0 19:58 pts/0    00:00:00 pgpool: wait for connection request
root     12861 12828  0 19:58 pts/0    00:00:00 pgpool: PCP: wait for connection request
root     12862 12828  0 19:58 pts/0    00:00:00 pgpool: worker process
root     12863 12828  0 19:58 pts/0    00:00:00 pgpool: health check process(0)
root     12864 12828  0 19:58 pts/0    00:00:00 pgpool: health check process(1)
root     14061 14045  0 20:37 pts/1    00:00:00 grep pool
3、PG數據庫無法啟動
[postgres@node2 data]$ /opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data/ -l logfile start
報錯:
等待服務器進程啟動 .... 已停止等待
pg_ctl: 無法啟動服務器進程
檢查日志輸出.

按報錯提示查看日志
tail logfile 
2018-05-30 22:40:05.208 PDT [16383] 日志:  在0/8000130上已到達一致性恢復狀態
2018-05-30 22:40:05.208 PDT [16382] 日志:  數據庫系統準備接受只讀請求的連接
2018-05-30 22:40:05.242 PDT [16387] 日志:  在時間點: 0/C000000 (時間安排1)啟動日志的流操作
2018-05-30 23:19:59.272 PDT [16382] 日志:  接到到智能 (smart) 停止請求
2018-05-30 23:19:59.325 PDT [16387] 致命錯誤:  由于管理員命令中斷walreceiver進程
2018-05-30 23:19:59.332 PDT [16384] 日志:  正在關閉
2018-05-30 23:19:59.426 PDT [16382] 日志:  數據庫系統已關閉
2018-06-03 23:59:31.974 PDT [15817] 致命錯誤:  無法寫入鎖文件 "postmaster.pid": 設備上沒有空間
2018-06-04 00:00:32.287 PDT [15840] 致命錯誤:  無法寫入鎖文件 "postmaster.pid": 設備上沒有空間
2018-06-04 00:01:54.556 PDT [15867] 致命錯誤:  無法寫入鎖文件 "postmaster.pid": 設備上沒有空間

df -h查看磁盤空間，果然磁盤空間不足
[postgres@node2 data]$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda2        18G   17G   18M 100% /
tmpfs           242M   72K  242M   1% /dev/shm
/dev/sda1       291M   39M  238M  14% /boot
[postgres@node2 data]$ 4、主從切換后，從庫日志報錯
主從切換后，從庫logfile日志報錯：
2018-07-01 21:08:41.889 PDT [2644] 日志:  listening on IPv4 address "0.0.0.0", port 5432
2018-07-01 21:08:41.889 PDT [2644] 日志:  listening on IPv6 address "::", port 5432
2018-07-01 21:08:41.893 PDT [2644] 日志:  listening on Unix socket "/tmp/.s.PGSQL.5432"
2018-07-01 21:08:41.954 PDT [2645] 日志:  數據庫上次關閉時間為 2018-07-01 21:08:41 PDT
2018-07-01 21:08:42.008 PDT [2644] 日志:  數據庫系統準備接受連接

從庫的安裝目錄需增加文件recovery.conf
且需配置如下：
vi /data/pg/data/recovery.conf

recovery_target_timeline = 'latest'

standby_mode = 'on'  #--標記PG為STANDBY SERVER

primary_conninfo = 'host=192.168.159.152 port=5432 user=replica password=replica'   #--標識主庫信息

trigger_file = '/data/pg/data/trigger.kenyon'     #--標識觸發器文件

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