一、下载POSTGRESQL源码安装包及主机配置
https://www.postgresql.org/ftp/source/v10.3/
postgresql-10.3.tar.gz

虚拟机环境
node1 192.168.159.151
node2 192.168.159.152

操作系统为redhat6.5
数据库为postgresql10.3

两个节点均配置/etc/hosts
vi /etc/hosts
node1 192.168.159.151
node2 192.168.159.152
二、编译安装
(1)创建postgres用户
useradd -m -r -s /bin/bash -u 5432 postgres
(2)安装相关依赖包
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

最后几行出现以下黄色输出即配置正确,否则根据报错提示继续安装依赖包
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)编译
make && make install

最后几行出现以下黄色输出即配置正确
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)安装
make world && make install -world

最后几行出现以下黄色输出即配置正确
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)创建相关目录及配置环境变量
mkdir -p /data/pgdata/serverlog
mkdir /data/pg
su - postgres
vi .bash_profile (删除原来的所有,以下黄色部分直接复制粘贴)
# .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数据目录
PGDATA=/data/pgdata
export PGPORT PGDATA

#所使用的语言
export LANG=zh_CN.utf8

#PostgreSQL 安装目录
export PGHOME=/data/pg

#PostgreSQL 连接库文件
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"`

#将PostgreSQL的命令行添加到 PATH 环境变量
export PATH=$PGHOME/bin:$PATH

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

#PostgreSQL的默认用户
export PGUSER=postgres

#PostgreSQL默认主机地址
export PGHOST=127.0.0.1

#默认的数据库名
export PGDATABASE=postgres

#定义日志存放目录
PGLOG="$PGDATA/serverlog"source .bash_profile

(7)初始化数据库
#执行数据库初始化脚本
root用户登录
chown -R postgres.postgres /data/
su - postgres
$/opt/postgresql-10.3/bin/initdb --encoding=utf8 -D /data/pg/data警告:为本地连接启动了 "trust" 认证.
你可以通过编辑 pg_hba.conf 更改或你下次
行 initdb 时使用 -A或者--auth-local和--auth-host选项.Success. You can now start the database server using:启动数据库
su - postgres
/opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data -l logfile start
(8)相关命令拷贝
root用户
mkdir/data/pg/bin
cp/opt/postgresql-10.3/bin/* /data/pg/bin
chown -R postgres.postgres/data/pg/bin


三、postgresql主从搭建

1、主库配置

(1)创建一个用户复制的用户replica
su - postgres

psql

CREATE ROLE replica login replication encrypted password 'replica';

(2)修改pg_hba.conf文件,指定replica登录网络(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

2、从库环境

(1)把备库的数据文件夹目录清空

rm -rf/var/lib/pgsql/10/data/*

(2)在备库上运行

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

输入密码replica

!!!注意,复制完成后,在备库一定要将数据目录下的所有文件重新授权

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

(3)创建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#一般从的最大链接要大于主的

hot_standby =on #说明这台机器不仅仅用于数据归档,也用于查询

max_standby_streaming_delay =30s

wal_receiver_status_interval = 10s #多久向主报告一次从的状态

hot_standby_feedback = on #如果有错误的数据复制,是否向主进行范例

如果无法启动,到主库复制文件postmaster.opts到备库如下操作:

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、验证主从功能

主库查询

su - postgres

psql

postgres=# select client_addr,sync_state from pg_stat_replication;

client_addr | sync_state

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

192.168.159.152 | async

(1 row)

发现登陆postgres时出现以下问题
-bash-4.1$
root用户执行
cp /etc/skel/.bash* /var/lib/pgsql/
再次登陆即可变成
[postgres@node1 ~]$4、手动主备切换

(1)创建备库recovery.conf 文件( 在备库上操作192.168.159.152)

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

配置以下参数

standby_mode = 'on' --标记PG为STANDBY SERVER

primary_conninfo = 'host=192.168.159.151 port=5432 user=replica password=replica' --标识主库信息

trigger_file = '/data/pg/data/trigger.kenyon' --标识触发器文件

(2) 关闭主库(在主库上操作192.168.159.151)

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

(3)激活备库到主库状态 ( 在备库上操作192.168.159.152 )

激活备库只要创建一个文件即可,根据备库 recovery.conf 配置文件的参数 trigger_file 值,

创建这个 trigger 文件即可。 例如 "touch /data/pg/data/trigger.kenyon"

touch /data/pg/data/trigger.kenyon

过一会儿发现 recovery.conf 文件变成 recovery.done ,说明备库已经激活。

查看logfile日志,出现以下信息即激活
2018-06-04 21:11:01.137 PDT [12818] 日志: 已找到触发器文件:/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: 已选择的新时间线ID:2
2018-06-04 21:11:05.442 PDT [12818] 日志: 归档恢复完毕
2018-06-04 21:11:05.568 PDT [12817] 日志: 数据库系统准备接受连接

--修改 pg_hba.conf (现在的主库上增加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

在现在的主库操作:
scp /data/pg/data/pg_wal/00000002.history 192.168.159.151:/data/pg/data/pg_wal/

(6)两个节点都操作
vi /data/pg/data/recovery.conf
restore_command = 'cp /data/pg/data/archive/%f %p'

注意:这里我的网卡是eth2,所以,下面2个节点的黄色字体配置要相应变化
如果网卡配置不正确,会报类似这样的报错arping: unknown iface eth0

1节点
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' ##配置数据节点 node1
backend_port0 = 5432
backend_weight0 = 1
backend_flag0 = 'ALLOW_TO_FAILOVER'
backend_hostname1 = '192.168.159.152' ##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 /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指定出口网卡
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' # 配置对端的 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 = ''2节点
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指定出口网卡
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;给脚本授权
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/

启动pgpool
pgpool -n &关闭pgpool
pgpool -m fast stop

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

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

查看pgpool节点
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、安装keepalive
tar xvfkeepalived-1.4.2.tar.gz
cdkeepalived-1.4.2
./configure
make
make install
mkdir /etc/keepalived
cd /etc/keepalived/
1节点:
vi /etc/keepalived/keepalived.conf
global_defs {
router_id node1
}
vrrp_instance VI_1 {
state BACKUP #设置为主服务器
interface eth2:0 #监测网络接口
virtual_router_id 51 #主、备必须一样
priority 100 #(主、备机取不同的优先级,主机值较大,备份机值较小,值越大优先级越高)
advert_int 1 #VRRP Multicast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式,主备必须一致
auth_pass 1111 #(密码)
}
virtual_ipaddress {
192.168.159.153/24 #VRRP HA虚拟地址
}

2节点:
vi /etc/keepalived/keepalived.conf
global_defs {
router_id node2
}
vrrp_instance VI_1 {
state BACKUP #设置为主服务器
interface eth2:0 #监测网络接口
virtual_router_id 51 #主、备必须一样
priority 90 #(主、备机取不同的优先级,主机值较大,备份机值较小,值越大优先级越高)
advert_int 1 #VRRP Multicast广播周期秒数
authentication {
auth_type PASS #VRRP认证方式,主备必须一致
auth_pass 1111 #(密码)
}
virtual_ipaddress {
192.168.159.153/24 #VRRP HA虚拟地址
}

cp ifcfg-eth2 ifcfg-eth2:0

viifcfg-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'

将原来的那行注释掉,用这种方式就可以了

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点的第四小点有手动主备切换的步骤

VIP暂时还是不能自动漂浮切换,但是可以手动切换主备(按上面的配置会出现两个节点都有VIP192.168.159.153,这就很奇怪)
目前手动切换主备,可以实现VIP自动漂浮切换,但是前提条件是pgpool必须停止,比如主节点的postgresql数据库实例停止了,那同时主节点pgpool也要停止,这样过几分钟左右,从节点的vip192.168.159.153就会自动起来。
一定要注意的是,主备切换动作完成后,要用命令查看及测试切换是否成功,比如登陆
/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;
这些查到的信息确认正确后,再尝试create一个测试table看是否能够创建
create table test123 (tt int);注意,在/data/pg/data/gprof目录下,有很多的一些二进制文件,不知道是什么,会占用大量的存储空间。请教大神指导,哈哈PG主从+pgpool ii 搭建完成后相关报错
1、PG无法登陆问题
原本第一步搭建好PG主从,测试主从同步功能,登陆都没问题
但是在后续安装配置pgpool ii 高可用的时候,突然发现PG无法登陆了,报错如下:
[postgres@node1 ~]$ psql
psql: symbol lookup error: psql: undefined symbol: PQconnectdbParams

因为启动PG的时候是有执行日志的
[postgres@node1 ~]$ /opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data -l logfile start
可以在postgres家目录查看logfile日志报错信息:
2018-05-31 23:00:18.703 PDT [12734] 致命错误: 无法加载库 "/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] 致命错误: 无法加载库 "/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] 致命错误: 无法加载库 "/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] 致命错误: 无法加载库 "/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] 致命错误: 无法加载库 "/opt/postgresql-10.3/lib/libpqwalreceiver.so": /opt/postgresql-10.3/lib/libpqwalreceiver.so: undefined symbol: PQescapeIdentifier 这个时候,可以临时执行
export LD_LIBRARY_PATH=/opt/postgresql-10.3/lib/libpqwalreceiver.so
加载缺失的库文件,再重新启动PG就可以登录了

想要永久的解决,如下:
vi ~/.bash_profile
在最后一行添加
export LD_LIBRARY_PATH=/opt/postgresql-10.3/lib/libpqwalreceiver.so2、PGPOOL无法启动问题
使用命令pgpool -n & 启动pgpool,发现无法启动
[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进程,发现存在残留进程
kill 3205
kill 3206
再次启动pgpool成功

成功启动的pgpool是以下这样的
[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数据库无法启动
[postgres@node2 data]$ /opt/postgresql-10.3/bin/pg_ctl -D /data/pg/data/ -l logfile start
报错:
等待服务器进程启动 .... 已停止等待
pg_ctl: 无法启动服务器进程
检查日志输出.

按报错提示查看日志
tail logfile
2018-05-30 22:40:05.208 PDT [16383] 日志: 在0/8000130上已到达一致性恢复状态
2018-05-30 22:40:05.208 PDT [16382] 日志: 数据库系统准备接受只读请求的连接
2018-05-30 22:40:05.242 PDT [16387] 日志: 在时间点: 0/C000000 (时间安排1)启动日志的流操作
2018-05-30 23:19:59.272 PDT [16382] 日志: 接到到智能 (smart) 停止请求
2018-05-30 23:19:59.325 PDT [16387] 致命错误: 由于管理员命令中断walreceiver进程
2018-05-30 23:19:59.332 PDT [16384] 日志: 正在关闭
2018-05-30 23:19:59.426 PDT [16382] 日志: 数据库系统已关闭
2018-06-03 23:59:31.974 PDT [15817] 致命错误: 无法写入锁文件 "postmaster.pid": 设备上没有空间
2018-06-04 00:00:32.287 PDT [15840] 致命错误: 无法写入锁文件 "postmaster.pid": 设备上没有空间
2018-06-04 00:01:54.556 PDT [15867] 致命错误: 无法写入锁文件 "postmaster.pid": 设备上没有空间

从库的安装目录需增加文件recovery.conf
且需配置如下:
vi /data/pg/data/recovery.conf

recovery_target_timeline = 'latest'

standby_mode = 'on' #--标记PG为STANDBY SERVER

primary_conninfo = 'host=192.168.159.152 port=5432 user=replica password=replica' #--标识主库信息

trigger_file = '/data/pg/data/trigger.kenyon' #--标识触发器文件