1.MySQL版本：
mysql> select @@version;
+-----------+
| @@version |
+-----------+
| 8.0.18 |
+-----------+
1 row in set (0.00 sec)2.Centos操作系统版本
[root@Hadoop-00 /]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)
二、Mysql现在以及解压
1. 地址：https://downloads.mysql.com/archives/community/
2.linux中下载
1.在命令中输入这个语句，获取 mysql-8.0.18-1.el7.x86_64.rpm-bundle.tar：
wget https://cdn.mysql.com/archives/mysql-8.0/mysql-8.0.18-1.el7.x86_64.rpm-bundle.tar
2.解压：
tar -xvf mysql-8.0.18-1.el7.x86_64.rpm-bundle.tar
-rw-r--r-- 1 root root 684851200 9月 23 15:36 mysql-8.0.18-1.el7.x86_64.rpm-bundle.tar
-rw-r--r-- 1 7155 31415 40104640 9月 23 15:19 mysql-community-client-8.0.18-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 611436 9月 23 15:20 mysql-community-common-8.0.18-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 6915400 9月 23 15:20 mysql-community-devel-8.0.18-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 23683600 9月 23 15:20 mysql-community-embedded-compat-8.0.18-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 3877664 9月 23 15:20 mysql-community-libs-8.0.18-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 1363968 9月 23 15:20 mysql-community-libs-compat-8.0.18-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 450282440 9月 23 15:21 mysql-community-server-8.0.18-1.el7.x86_64.rpm
-rw-r--r-- 1 7155 31415 158001648 9月 23 15:22 mysql-community-test-8.0.18-1.el7.x86_64.rpm
三、安装
1. 卸载系统自带的mariadb-lib
查看mariadb版本
rpm -qa|grep mariadb
mariadb-libs-5.5.56-2.el7.x86_64卸载mariadb
rpm -e mariadb-libs-5.5.56-2.el7.x86_64 --nodeps
2.安装依赖环境
yum install -y openssl-devel.x86_64 openssl.x86_64
yum install -y libaio.x86_64 libaio-devel.x86_64
yum install -y perl.x86_64 perl-devel.x86_64
yum install -y perl-JSON.noarch
yum install -y autoconf
yum install -y wget
yum install -y net-tools
3.关闭防火墙
systemctl stop firewalld.service
systemctl disable firewalld.service
4.禁用selinux
vi /etc/selinux/config
将SELINUX=enforcing改为SELINUX=disabledreboot重启机器
5.安装
/** 必须按顺序装，防止出现未知的问题 */ rpm -ivh mysql-community-common-8.0.-.el7.x86_64.rpm
rpm -ivh mysql-community-libs-8.0.-.el7.x86_64.rpm
rpm -ivh mysql-community-client-8.0.-.el7.x86_64.rpm
rpm -ivh mysql-community-server-8.0.-.el7.x86_64.rpm -------------------------------------------------------------------------------- rpm -ivh mysql-community-libs-compat-8.0.-.el7.x86_64.rpm
rpm -ivh mysql-community-embedded-compat-8.0.-.el7.x86_64.rpm
rpm -ivh mysql-community-devel-8.0.-.el7.x86_64.rpm
rpm -ivh mysql-community-test-8.0.-.el7.x86_64.rpm --初始化数据库
mysqld --initialize --console
--目录授权，否则启动失败
chown -R mysql:mysql /var/lib/mysql/
--启动服务
systemctl start mysqld
6.登陆密码设置
//报错
ERROR (HY000): Can't connect to MySQL server on 'localhost' (111) '
1）更改配置，此处可以跳过密码设置
vi /etc/my.cnf
#在mysqld模块下添加
skip-grant-tables
// password 函数在MySQL8中位置，以下步骤未实现
2）重启服务：
systemctl restart mysqld
3） 按照传统改密码方式发现没有 password这个字段。
mysql> update user set password=password('123') where user='root';
ERROR 1054 (42S22): Unknown column 'password' in 'field list'
网上查了一下据说5.7 版本password 字段改成authentication_string password函数未知
mysql> update user set authentication_string=password('123') where user='root';
Query OK, 1 row affected, 1 warning (0.00 sec)
Rows matched: 1 Changed: 1 Warnings: 1
user 表的管理字段
+--------------------------+-----------------------------------+------+-----+-----------------------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------------------------+-----------------------------------+------+-----+-----------------------+-------+
| Host | char(255) | NO | PRI | | |
| User | char(32) | NO | PRI | | |
| Select_priv | enum('N','Y') | NO | | N | |
| Insert_priv | enum('N','Y') | NO | | N | |
| Update_priv | enum('N','Y') | NO | | N | |
| Delete_priv | enum('N','Y') | NO | | N | |
| Create_priv | enum('N','Y') | NO | | N | |
| Drop_priv | enum('N','Y') | NO | | N | |
| Reload_priv | enum('N','Y') | NO | | N | |
| Shutdown_priv | enum('N','Y') | NO | | N | |
| Process_priv | enum('N','Y') | NO | | N | |
| File_priv | enum('N','Y') | NO | | N | |
| Grant_priv | enum('N','Y') | NO | | N | |
| References_priv | enum('N','Y') | NO | | N | |
| Index_priv | enum('N','Y') | NO | | N | |
| Alter_priv | enum('N','Y') | NO | | N | |
| Show_db_priv | enum('N','Y') | NO | | N | |
| Super_priv | enum('N','Y') | NO | | N | |
| Create_tmp_table_priv | enum('N','Y') | NO | | N | |
| Lock_tables_priv | enum('N','Y') | NO | | N | |
| Execute_priv | enum('N','Y') | NO | | N | |
| Repl_slave_priv | enum('N','Y') | NO | | N | |
| Repl_client_priv | enum('N','Y') | NO | | N | |
| Create_view_priv | enum('N','Y') | NO | | N | |
| Show_view_priv | enum('N','Y') | NO | | N | |
| Create_routine_priv | enum('N','Y') | NO | | N | |
| Alter_routine_priv | enum('N','Y') | NO | | N | |
| Create_user_priv | enum('N','Y') | NO | | N | |
| Event_priv | enum('N','Y') | NO | | N | |
| Trigger_priv | enum('N','Y') | NO | | N | |
| Create_tablespace_priv | enum('N','Y') | NO | | N | |
| ssl_type | enum('','ANY','X509','SPECIFIED') | NO | | | |
| ssl_cipher | blob | NO | | NULL | |
| x509_issuer | blob | NO | | NULL | |
| x509_subject | blob | NO | | NULL | |
| max_questions | int(11) unsigned | NO | | 0 | |
| max_updates | int(11) unsigned | NO | | 0 | |
| max_connections | int(11) unsigned | NO | | 0 | |
| max_user_connections | int(11) unsigned | NO | | 0 | |
| plugin | char(64) | NO | | caching_sha2_password | |
| authentication_string | text | YES | | NULL | |
| password_expired | enum('N','Y') | NO | | N | |
| password_last_changed | timestamp | YES | | NULL | |
| password_lifetime | smallint(5) unsigned | YES | | NULL | |
| account_locked | enum('N','Y') | NO | | N | |
| Create_role_priv | enum('N','Y') | NO | | N | |
| Drop_role_priv | enum('N','Y') | NO | | N | |
| Password_reuse_history | smallint(5) unsigned | YES | | NULL | |
| Password_reuse_time | smallint(5) unsigned | YES | | NULL | |
| Password_require_current | enum('N','Y') | YES | | NULL | |
| User_attributes | json | YES | | NULL | |
+--------------------------+-----------------------------------+------+-----+-----------------------+-------+
51 rows in set (0.01 sec)
4.更改配置重启
[root@master1 ~]# vi /etc/my.cnf
注释 # skip-grant-tables
[root@master1 ~]# systemctl restart mysqld
[root@master1 ~]# mysql -uroot -p123
5.成功：
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 10
Server version: 8.0.18 MySQL Community Server - GPL
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement
mysql>
7.其他
[root@Hadoop- log]# service mysqld start
Redirecting to /bin/systemctl start mysqld.service
[root@Hadoop- log]# 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 二 -- :: CST; 2s ago
Docs: man:mysqld()
http://dev.mysql.com/doc/refman/en/using-systemd.html
Process: ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=/SUCCESS)
Main PID: (mysqld)
Status: "Server is operational"
CGroup: /system.slice/mysqld.service
└─ /usr/sbin/mysqld 2月 :: Hadoop- systemd[]: Starting MySQL Server...
2月 :: Hadoop- systemd[]: Started MySQL Server.
2. 如果安装过程出现操作失误问题，卸载MySQL重新开始
yum remove mysql-community-client.x86_64
yum remove mysql-community-common.x86_64
yum remove mysql-community-devel.x86_64
yum remove mysql-community-embedded-compat.x86_64
yum remove mysql-community-libs.x86_64
yum remove mysql-community-libs-compat.x86_64
yum remove mysql-community-server.x86_64
yum remove mysql-community-test.x86_64
yum remove mysql57-community-release.noarch
------------------------------------------------------------------------
rm -rf /etc/rc.d/init.d/mysql
rm -rf /etc/selinux/targeted/active/modules/100/mysql
rm -rf /usr/share/mysql
rm -rf /opt/mysql
rm -rf /opt/mysql/mysql-5.7.25/bin/mysql
rm -rf /opt/mysql/mysql-5.7.25/include/mysql
rm -rf /opt/mysql/mysql-5.7.25/data/mysq 参见原文链接：
https://blog.csdn.net/qq_31708763/article/details/86485398
安装参考原文：
https://www.cnblogs.com/zyongzhi/p/10063149.html