一.postgresql数据库安装

1.下载软件包

地址：PostgreSQL: File Browser

2.解压安装

[root@postgresql u01]# tar -zxf postgresql-14.2.tar.gz

安装环境 

 yum install -y perl-ExtUtils-Embed readline-devel zlib-devel pam-devel libxml2-devel libxslt-devel openldap-devel python-devel gcc-c++ openssl-devel cmake

 3.编译

[root@postgresql u01]# cd  postgresql-14.2

[root@postgresql postgresql-14.2]# ./configure --prefix=/usr/local/postgresql

4.安装

[root@postgresql postgresql-14.2]# make && make install

5.进入安装后的目录，查看目录结构

[root@VM-8-15-centos ~]# cd /usr/local/postgresql

6、创建目录 data、log

[root@postgresql bin]#  mkdir /usr/local/postgresql/data
[root@postgresql bin]#  mkdir /usr/local/postgresql/log

7、加入系统环境变量

[root@postgresql bin]#vim /etc/profile

添加如下内容

export PGHOME=/usr/local/postgresql
export PGDATA=/usr/local/postgresql/data

export JAVA_HOME=/u01/jdk1.8.0_201
export CLASSPATH=$:CLASSPATH:$JAVA_HOME/lib/
export PATH=$PATH:$JAVA_HOME/bin
export PATH=$PATH:$JAVA_HOME/bin:$HOME/.local/bin:$HOME/bin:$PGHOME/bin

使配置文件生效

[root@postgresql bin]# source /etc/profile

 8、增加用户 postgres 并赋权

[root@postgresql postgresql]#  useradd postgres
[root@postgresql postgresql]#  chown -R postgres:root /usr/local/postgresql

9、初始化数据库

[root@postgresql ~]# su postgres
[postgres@postgresql root]$ /usr/local/postgresql/bin/initdb -D /usr/local/postgresql/data/

10.配置文件

[postgres@postgresql root]$ vim /usr/local/postgresql/data/postgresql.conf

[postgres@postgresql root]$ vim /usr/local/postgresql/data/pg_hba.conf

 添加

host    all             all             0.0.0.0/0               trust

 11、启动服务

[postgres@postgresql root]$ pg_ctl start -l /usr/local/postgresql/log/pg_server.log

 12.查看版本

[postgres@postgresql root]$ psql -V

 13.登录数据库

[postgres@postgresql root]$ psql -U postgres -d postgres

 13.查看有几个库

postgres=# \l

14.进库

postgres=# \c template1

15.建表

template1=# create table test(name varchar(20),age int);

 

 16 .查看库里面的表

template1=# \d

 17.切换库

template1=# \c postgres

18.建表插入数据

postgres=# create table class(id bigint,name varchar(20),age int,sex char(2));
CREATE TABLE
postgres=# \d
         List of relations
 Schema | Name  | Type  |  Owner   
--------+-------+-------+----------
 public | class | table | postgres
(1 row)

postgres=# insert into  class values(001,'赵华',16,'男');
INSERT 0 1

 19.查询数据条数

postgres=# select count(*) from class;

 

 二.pgpool安装

1.下载地址

Downloads - pgpool Wiki

2.解压

[root@sqlserver u01]# tar -zxvf pgpool-II-4.2.9.tar.gz

创建目录

mkdir -p /postgres/pgpool

 3.编译

[root@sqlserver pgpool-II-4.2.9]# ./configure  --with-pgsql=/postgres/pgpool

若报错configure: error: libpq is not installed or libpq is old

[root@sqlserver ~]# yum install -y postgresql* gcc*

4.安装

进入目录

[root@sqlserver pgpool-recovery]# cd /u01/pgpool-II-4.2.9/src/sql/pgpool-recovery

安装 

[root@sqlserver pgpool-recovery]# make && make install

5.更改 

[root@sqlserver data]# vim postgresql.conf

 更改内容

archive_mode = on
archive_command = 'cp "%p" "/postgres/archivedir" '
max_wal_senders = 10
max_replication_slots = 10
wal_level = replica

创建目录

[root@sqlserver pgpool-recovery]# mkdir -p /postgres/archivedir

6.重启数据库 

[postgres@postgresql data]$ pg_ctl restart

7.主库修改postgres的密码、创建流复制用户repl

ALTER USER postgres WITH PASSWORD  '123456';
CREATE ROLE pgpool WITH PASSWORD  '123456' LOGIN;
CREATE ROLE repl WITH PASSWORD '123456'  REPLICATION LOGIN;

postgres=# 
postgres=# ALTER USER postgres WITH PASSWORD  '123456';
ALTER ROLE
postgres=# CREATE ROLE pgpool WITH PASSWORD  '123456' LOGIN;
CREATE ROLE
postgres=# CREATE ROLE repl WITH PASSWORD '123456'  REPLICATION LOGIN;
CREATE ROLE

 8.创建测试表tb_pgpool

postgres=# CREATE TABLE tb_pgpool ( id serial,age bigint,insertTime timestamp default now());
                     ^
postgres=# insert into tb_pgpool(age) values(1);

查询

postgres=# select * from tb_pgpool;
 id | age |         inserttime         
----+-----+----------------------------
  1 |   1 | 2023-01-01 18:52:26.506927
(1 行记录)

9.pgpool配置 

 查找pgpool.conf.sample-stream

[postgres@postgresql pgpool-II-4.2.9]$ find ./ -name pgpool.conf.sample-stream