Linux PostgresQL数据库安装 开机自启动 远程连接(服务器架设篇)

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我在自己一台老旧的DELL电脑上安装了cent os7作为平常的开发服务器。在平时我工作中主要使用的关系型数据库是MySql,但是作为一个程序员要对技术产生好奇和爱好,PostgreQL也是十分优秀的关系数据库,在MySql被Oracle收购后,PostgresQL的开源属性使它有可能成为新关系型数据库宠儿。

废话不多讲了我们直接进入安装环节,首先我们进入官网的安装教程页面(PostgresQL 官方Cent os7 x86安装教程),按人家的步骤安装就可以了。

下面是实际安装演示:

# 安装PostgresQL yum源
[root@thinkcent thinktik]# yum install https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-7-x86_64/pgdg-centos10-10-2.noarch.rpm
Loaded plugins: fastestmirror
pgdg-centos10-10-2.noarch.rpm                                                     | 4.6 kB  00:00:00     
Examining /var/tmp/yum-root-xbOUDb/pgdg-centos10-10-2.noarch.rpm: pgdg-centos10-10-2.noarch
Marking /var/tmp/yum-root-xbOUDb/pgdg-centos10-10-2.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package pgdg-centos10.noarch 0:10-2 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================
 Package                  Arch              Version          Repository                             Size
=========================================================================================================
Installing:
 pgdg-centos10            noarch            10-2             /pgdg-centos10-10-2.noarch            2.7 k

Transaction Summary
=========================================================================================================
Install  1 Package

Total size: 2.7 k
Installed size: 2.7 k
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : pgdg-centos10-10-2.noarch                                                             1/1 
  Verifying  : pgdg-centos10-10-2.noarch                                                             1/1 

Installed:
  pgdg-centos10.noarch 0:10-2                                                                            

Complete!

# 安装postgresql
[root@thinkcent thinktik]# yum install postgresql10
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.cn99.com
pgdg10                                                                            | 4.1 kB  00:00:00     
(1/2): pgdg10/7/x86_64/group_gz                                                   |  245 B  00:00:03     
(2/2): pgdg10/7/x86_64/primary_db                                                 | 162 kB  00:00:03     
Resolving Dependencies
--> Running transaction check
---> Package postgresql10.x86_64 0:10.4-1PGDG.rhel7 will be installed
--> Processing Dependency: postgresql10-libs(x86-64) = 10.4-1PGDG.rhel7 for package: postgresql10-10.4-1PGDG.rhel7.x86_64
--> Processing Dependency: libicu for package: postgresql10-10.4-1PGDG.rhel7.x86_64
--> Processing Dependency: libpq.so.5()(64bit) for package: postgresql10-10.4-1PGDG.rhel7.x86_64
--> Running transaction check
---> Package libicu.x86_64 0:50.1.2-15.el7 will be installed
---> Package postgresql10-libs.x86_64 0:10.4-1PGDG.rhel7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================
 Package                       Arch               Version                       Repository          Size
=========================================================================================================
Installing:
 postgresql10                  x86_64             10.4-1PGDG.rhel7              pgdg10             1.5 M
Installing for dependencies:
 libicu                        x86_64             50.1.2-15.el7                 base               6.9 M
 postgresql10-libs             x86_64             10.4-1PGDG.rhel7              pgdg10             354 k

Transaction Summary
=========================================================================================================
Install  1 Package (+2 Dependent packages)

Total download size: 8.8 M
Installed size: 33 M
Is this ok [y/d/N]: y
Downloading packages:
(1/3): libicu-50.1.2-15.el7.x86_64.rpm                                            | 6.9 MB  00:00:06     
(2/3): postgresql10-libs-10.4-1PGDG.rhel7.x86_64.rpm                              | 354 kB  00:00:14     
(3/3): postgresql10-10.4-1PGDG.rhel7.x86_64.rpm                                   | 1.5 MB  00:01:18     
---------------------------------------------------------------------------------------------------------
Total                                                                    115 kB/s | 8.8 MB  00:01:18     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : postgresql10-libs-10.4-1PGDG.rhel7.x86_64                                             1/3 
  Installing : libicu-50.1.2-15.el7.x86_64                                                           2/3 
  Installing : postgresql10-10.4-1PGDG.rhel7.x86_64                                                  3/3 
  Verifying  : libicu-50.1.2-15.el7.x86_64                                                           1/3 
  Verifying  : postgresql10-10.4-1PGDG.rhel7.x86_64                                                  2/3 
  Verifying  : postgresql10-libs-10.4-1PGDG.rhel7.x86_64                                             3/3 

Installed:
  postgresql10.x86_64 0:10.4-1PGDG.rhel7                                                                 

Dependency Installed:
  libicu.x86_64 0:50.1.2-15.el7                postgresql10-libs.x86_64 0:10.4-1PGDG.rhel7               

Complete!

# 安装postgresql10-server(可选)
[root@thinkcent thinktik]# yum install postgresql10-server
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.cn99.com
Resolving Dependencies
--> Running transaction check
---> Package postgresql10-server.x86_64 0:10.4-1PGDG.rhel7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=========================================================================================================
 Package                        Arch              Version                        Repository         Size
=========================================================================================================
Installing:
 postgresql10-server            x86_64            10.4-1PGDG.rhel7               pgdg10            4.5 M

Transaction Summary
=========================================================================================================
Install  1 Package

Total download size: 4.5 M
Installed size: 18 M
Is this ok [y/d/N]: y
Downloading packages:
postgresql10-server-10.4-1PGDG.rhel7.x86_64.rpm                                   | 4.5 MB  00:00:06     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : postgresql10-server-10.4-1PGDG.rhel7.x86_64                                           1/1 
  Verifying  : postgresql10-server-10.4-1PGDG.rhel7.x86_64                                           1/1 

Installed:
  postgresql10-server.x86_64 0:10.4-1PGDG.rhel7                                                          

Complete!
# 初始化数据库并设置自启动
[root@thinkcent thinktik]# /usr/pgsql-10/bin/postgresql-10-setup initdb
Initializing database ... OK

[root@thinkcent thinktik]# systemctl enable postgresql-10
Created symlink from /etc/systemd/system/multi-user.target.wants/postgresql-10.service to /usr/lib/systemd/system/postgresql-10.service.
[root@thinkcent thinktik]# systemctl start postgresql-10
[root@thinkcent thinktik]# ps -ef | grep postgres
postgres 19567     1  0 15:22 ?        00:00:00 /usr/pgsql-10/bin/postmaster -D /var/lib/pgsql/10/data/
postgres 19569 19567  0 15:22 ?        00:00:00 postgres: logger process   
postgres 19571 19567  0 15:22 ?        00:00:00 postgres: checkpointer process   
postgres 19572 19567  0 15:22 ?        00:00:00 postgres: writer process   
postgres 19573 19567  0 15:22 ?        00:00:00 postgres: wal writer process   
postgres 19574 19567  0 15:22 ?        00:00:00 postgres: autovacuum launcher process   
postgres 19575 19567  0 15:22 ?        00:00:00 postgres: stats collector process   
postgres 19576 19567  0 15:22 ?        00:00:00 postgres: bgworker: logical replication launcher   
root     19578 19343  0 15:22 pts/0    00:00:00 grep --color=auto postgres

创建用户,创建库并允许远程访问

创建用户,创建库

# 切换用户
[root@thinkremote thinktik]# su - postgres
Last login: Wed Jul 18 14:19:01 CST 2018 on pts/2
# 登陆
-bash-4.2$ psql
psql (10.4)
Type "help" for help.
# 查询所有的库
postgres=# \l
                                  List of databases
   Name    |  Owner   | Encoding |   Collate   |    Ctype    |   Access privileges   
-----------+----------+----------+-------------+-------------+-----------------------
 postgres  | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | 
 template0 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 template1 | postgres | UTF8     | en_US.UTF-8 | en_US.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
(3 rows)
# 查询所有库
postgres=# \d
Did not find any relations.
# 创建用户
postgres=# CREATE USER dbuser WITH PASSWORD 'my_password';
CREATE ROLE
# 创建库
postgres=# CREATE DATABASE example_db OWNER dbuser;
CREATE DATABASE
# 赋权
postgres=# GRANT ALL PRIVILEGES ON DATABASE example_db TO dbuser;
GRANT
# 退出
postgres=# \q
-bash-4.2$ 

设置远程访问

# 修改postgresql.conf,修改端口和监听地址
[root@thinkremote thinktik]# vim /var/lib/pgsql/10/data/postgresql.conf


# - Connection Settings -
# 监听所有ip地址的访问
listen_addresses = '*'          # what IP address(es) to listen on;
                                        # comma-separated list of addresses;
                                        # defaults to 'localhost'; use '*' for all
                                        # (change requires restart)
# 监听端口1234
port = 1234                             # (change requires restart)
max_connections = 100                   # (change requires restart)
#superuser_reserved_connections = 3     # (change requires restart)

# 修改postgresql.conf,修改监听地址和验证方式为md5
[root@thinkremote thinktik]# vim /var/lib/pgsql/10/data/pg_hba.conf


# "local" is for Unix domain socket connections only
local   all             all                                     peer
# IPv4 local connections:
host    all             all             127.0.0.1/32            ident
# 加上这一行 允许所有的IP地址访问 密码为md5
host    all             all             0.0.0.0/0               md5
# IPv6 local connections:
host    all             all             ::1/128                 ident
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     peer
host    replication     all             127.0.0.1/32            ident
host    replication     all             ::1/128                 ident

防火墙和Selinux放行PostgresQL

# 开放postgresql服务 
firewall-cmd --add-service=postgresql --permanent
# 重载防火墙
firewall-cmd –reload
# selinux允许PostgresQL改端口(如果你的linux没有开Selinux就不必执行这句了)
semanage port -a -t postgresql_port_t -p tcp 1234

重启生效

systemctl restart postgresql-10

# 验证端口修改成功
[thinktik@thinkremote ~]$ psql -U dbuser-d example_db -p 1234
psql (10.4)
Type "help" for help.


# 远程连接可以使用datagrip或者navicat等自行验证,我就不讲了

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