Linux—安装MySQL数据库

一、yum源安装

1、建立yum源

参照地址：https://dev.mysql.com/doc/mysql-yum-repo-quick-guide/en/

[root@hadoop102 ~]#vi /etc/yum.repo.d/mysql.repo
#添加以下内容：

# Enable to use MySQL 5.7
[mysql57-community]
name=MySQL 5.7 Community Server
baseurl=http://repo.mysql.com/yum/mysql-5.7-community/el/$releasever/$basearch/
#enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql

2、yum安装

[root@hadoop102 ~]#yum install mysql-community-server

3、启动MySQL

[root@hadoop102 ~]#systemctl start mysqld.service # 启动MySQL

[root@hadoop102 ~]#systemctl status mysqld.service # 查看MySQL状态

4.登录MySQL

[root@hadoop102 ~]#mysql -u root -p  # 登录MySQL

  mysql>

如果不记得密码，可以修改/etc/my.cnf 文件，实现无密码登录，即在mysqld之下添加代码：

skip-grant-tables：跳过授权表，即无密码直接登陆

二、RPM包安装

1、下载MySQL安装文件并导入至Linux环境

 

2、安装MySQL文件

2.1.检查本机是否已经安装Mysql

[root@hadoop102 ~]#rpm -qa|grep -i mysql
rpm -qa |grep -i mariadb（centos7默认系统自带的）

如果安装有mariadb，需要进行清理，与MySQL安装有冲突

直接使用使用rpm -e --nodeps  XXX.rpm 进行卸载，不能使用yum remove  mariadb。

2.2.安装server端

[root@hadoop102 ~]#rpm -ivh mysql-community-common-5.7.33-1.el7.x86_64.rpm

2.3. 获取随机密码

[root@hadoop102 ~]# cat /root/.mysql_secret 
# The random password set for the root user at Fri Feb  5 16:04:20 2021 (local time): ZYcmFZtQWbojI0az
# The random password set for the root user at Sat Feb  6 13:28:51 2021 (local time): kHJB7mzFpve4plaM
# The random password set for the root user at Sat Feb  6 14:29:08 2021 (local time): MqgLMOTy15FTTQnx
[root@hadoop102 ~]# 

2.4.启动MySQL

[root@hadoop102 ~]# service mysqld start  
Redirecting to /bin/systemctl start mysqld.service
[root@hadoop102 ~]# service mysqld status
Redirecting to /bin/systemctl status mysqld.service
● mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since 日 2021-02-07 23:42:48 CST; 7s ago
     Docs: man:mysqld(8)
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process: 9229 ExecStart=/usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid $MYSQLD_OPTS (code=exited, status=0/SUCCESS)
  Process: 9208 ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=0/SUCCESS)
 Main PID: 9232 (mysqld)
    Tasks: 27
   CGroup: /system.slice/mysqld.service
           └─9232 /usr/sbin/mysqld --daemonize --pid-file=/var/run/mysqld/mysqld.pid

2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.748384Z 0 [Note] InnoDB: Loading buffer pool(s) from /usr/local/m...er_pool
2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.760094Z 0 [Warning] CA certificate ca.pem is self signed.
2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.760271Z 0 [Note] Skipping generation of RSA key pair as key files...ectory.
2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.762822Z 0 [Note] Server hostname (bind-address): '*'; port: 3306
2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.763319Z 0 [Note] IPv6 is available.
2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.763342Z 0 [Note]   - '::' resolves to '::';
2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.763367Z 0 [Note] Server socket created on IP: '::'.
2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.779061Z 0 [Note] InnoDB: Buffer pool(s) load completed at 210207 23:42:48
2月 07 23:42:48 hadoop102 mysqld[9229]: 2021-02-07T15:42:48.864376Z 0 [Note]
2月 07 23:42:48 hadoop102 systemd[1]: Started MySQL Server.
Hint: Some lines were ellipsized, use -l to show in full.
[root@hadoop102 ~]# 

2.5.登录MySQL

[root@hadoop102 ~]# mysql -u root -p  
Enter password: 

Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.33 MySQL Community Server (GPL)

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mysql>