CentOS7安装配置简单使用postgresql10

说明：

   1， Linux版本：CentOS7
   2,  postgresql的版本：10（最新是11），主要方便入手，不用最新的
   3， pipelineDB是基于postgres的stream数据库。完全兼容pg的东西

注意：下一篇写pipelineDB安装使用

准备工作：

 $ rpm -qa | grep postgres                 # 检查PostgreSQL 是否已经安装
 $ rpm -qal | grep postgres                # 检查PostgreSQL 安装位置

#卸载 (检查系统是否已安装postgreSQL，卸载并清除干净。yum库自带的比较老旧)
$ rpm -e postgresql94-contrib-9.4.4-1PGDG.rhel6.x86*64 postgresql94-server-9.4.4-1PGDG.rhel6.x86*64
$ rpm -e postgresql94-libs-9.4.4-1PGDG.rhel6.x86*64 postgresql94-9.4.4-1PGDG.rhel6.x86*64

安装postgresql10：

参考：https://blog.csdn.net/rudy5348/article/details/79299162

一，更新postgresql源：

# 1, postgresql11
yum install  https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm   -y

# 2, postgresql10
yum install https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-7-x86_64/pgdg-centos10-10-2.noarch.rpm -y  

二、安装postgresql：

yum list | grep postgresql     # 先查看postgresql源
yum install postgresql10-contrib  postgresql10-server -y

三、初始化数据库

在这里，如果在装系统开始分配var空间足够大则可以继续，如果分配var空间不够，我们需要更改数据目录，在这里，我们假设var空间足够大。直接开始初始化。

1，Postgresql安装目录是 /usr/pgsql-10

[root@localhost ~]# cd /usr/pgsql-10/
[root@localhost pgsql-10]# ls
bin  doc  include  lib  share
[root@localhost pgsql-10]# cd bin
[root@localhost bin]# /usr/pgsql-10/bin/postgresql-10-setup initdb
Initializing database ... OK

2，Postgresql的数据目录是 /var/lib/pgsql/版本号/data目录

[root@localhost ~]# cd /var/lib/pgsql/10
[root@localhost 10]# ls
backups  data  initdb.log
[root@localhost 10]# vim initdb.log 

四、启动数据库并设置开机启动

1，创建其他账户（PipelineDB与ElasticSearch 【搜索引擎】也不能以ｒｏｏｔ的身份运行）

useradd user123
passwd user123

#切换用户
su user123  # 其他用户
su -        # root权限

[user123@localhost ~]$ sudo find / -name pipelinedb
[sudo] user123 的密码：
user123 不在 sudoers 文件中。此事将被报告。
您在 /var/spool/mail/root 中有邮件

# user123 不在 sudoers 文件中。此事将被报告。解决如下：
# 先切换到root权限：
su -
vim /etc/sudoers

# 输入  user123 ALL=(ALL)       ALL

# 显示是只读，使用  wq! 保存

reboot    #  重启
su user123

打开配置的如下图所示：

su -
vim /etc/sudoers

2，启动数据库并设置开机启动

sudo systemctl start postgresql-10
sudo systemctl enable postgresql-10.service

[root@localhost ~]# sudo systemctl start postgresql-10
[root@localhost ~]# sudo systemctl enable postgresql-10.service
Created symlink from /etc/systemd/system/multi-user.target.wants/postgresql-10.service to /usr/lib/systemd/system/postgresql-10.service.

五、登录postgresql并设置密码

 postgresql在安装时默认添加用户postgres
 
 [root@localhost ~]#su - postgres
 [root@localhost ~]#psql
 
 [root@localhost ~]# su - postgres
-bash-4.2$ psql
psql (10.9)
输入 "help" 来获取帮助信息.

postgres=# ALTER USER postgres WITH PASSWORD '123456';  #设置密码
ALTER ROLE
postgres=# \q   #@1，退出 \q  2，列出所有库 \l  @3，列出所有用户 \du  4，列出库下所有表\d

-bash-4.2$ 

1，创建除postgres外的用户

postgres=# create user user123 with password '123456';
CREATE ROLE
postgres=#

创建数据库

postgres=# create database dbtest owner username; -- 创建数据库指定所属者
CREATE DATABASE
postgres=#

将数据库得权限，全部赋给某个用户

postgres=# grant all on database dbtest to username; -- 将dbtest所有权限赋值给username
GRANT
postgres=#

导入整个数据库

psql -U username databasename < /data/dum.sql -- 用户名和数据库名

六、默认情况下postgresql是不用密码不支持远程登录的。

我们需要修改配置文件

vi /var/lib/pgsql/10/data/pg_hba.conf

# ----------------------------------
#
# If you want to allow non-local connections, you need to add more
# "host" records.  In that case you will also need to make PostgreSQL
# listen on a non-local interface via the listen_addresses
# configuration parameter, or via the -i or -h command line switches.

# TYPE  DATABASE        USER            ADDRESS                 METHOD
# "local" is for Unix domain socket connections only
local   all             all                                     peer
# IPv4 local connections:
host    all             all             127.0.0.1/32            ident
# 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

改为

# ----------------------------------
#
# If you want to allow non-local connections, you need to add more
# "host" records.  In that case you will also need to make PostgreSQL
# listen on a non-local interface via the listen_addresses
# configuration parameter, or via the -i or -h command line switches.


# TYPE  DATABASE        USER            ADDRESS                 METHOD
# "local" is for Unix domain socket connections only
local   all             all                                     md5
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.

#local   replication     all                                     md5
#host    replication     all             127.0.0.1/32            md5
#host    replication     all             ::1/128                 md5
host     all             all             0.0.0.0/0               md5  

我们改 远程访问

安装iptables防火墙 ： https://blog.csdn.net/gaokcl/article/details/82908844

这是我的习惯，也可以不改

vim /etc/sysconfig/iptables

 # Generated by iptables-save v1.4.21 on Sun Jul  7 22:43:09 2019
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [6:664]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 6379 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A INPUT -p tcp -m tcp --dport 5342 -j ACCEPT
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Sun Jul  7 22:43:09 2019
~                                                                                                 
~                                                                                                 
~                                                                                                 
~                                                                                                 
~                                                                                                 
"/etc/sysconfig/iptables" 17L, 715C  

vi /var/lib/pgsql/10/data/postgresql.conf

# root权限下，开放 postgresql的5432端口
# 安装iptables ： https://blog.csdn.net/gaokcl/article/details/82908844
vim /etc/sysconfig/iptables
-A  INPUT -t tcp -m tcp --dport  5432 -j ACCEPT ，

service iptables restart     # 重启防火墙 
service iptables save        # 保存防火墙修改 

vi /var/lib/pgsql/10/data/postgresql.conf

# - Connection Settings -
#listen_addresses = 'localhost'         # what IP address(es) to listen on;
# comma-separated list of addresses;
# defaults to 'localhost'; use '*' for all
# (change requires restart)
#port = 5432                            # (change requires restart)

改为

# - Connection Settings -
listen_addresses = '*'         # what IP address(es) to listen on;
# comma-separated list of addresses;
# defaults to 'localhost'; use '*' for all
# (change requires restart)
port = 5432                            # (change requires restart)

重启postgresql

systemctl restart postgresql-10

七，登录postgresql + 远程连接数据库

上面是本地的VM安装的Linux系统的postpredb链接，，下面是 远程的链接（像阿里云、腾讯云）

[root@localhost ~]# su - postgres
上一次登录：日 7月  7 22:28:21 CST 2019pts/0 上
-bash-4.2$ psql
口令：
psql (10.9)
输入 "help" 来获取帮助信息.

postgres=# \l     # 显示消息
                                     数据库列表
   名称    |  拥有者  | 字元编码 |  校对规则   |    Ctype    |       存取权限        
-----------+----------+----------+-------------+-------------+-----------------------
 postgres  | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | 
 template0 | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 template1 | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | =c/postgres          +
           |          |          |             |             | postgres=CTc/postgres
 testdb    | postgres | UTF8     | zh_CN.UTF-8 | zh_CN.UTF-8 | =Tc/postgres         +
           |          |          |             |             | postgres=CTc/postgres+
           |          |          |             |             | user123=CTc/postgres
(4 行记录)

postgres=# CREATE DATABASE testdb;  # 创建数据库
postgres=# CREATE USER user123 CREATEDB LOGIN PASSWORD '123456'; # 创建用户
postgres=# GRANT ALL ON DATABASE testdb TO user123; # 将testdb所有权限赋给用户user123
postgres=# drop database testdb;  # 删除数据库
postgres=# drop role user123;  # 删除用户

postgres=# \l     # 显示消息