Linux安装mysql过程（转+完善）
blog.csdn/jerome_s/article/details/52883234
yum 安装MySQL
1. 检查安装情况
查看有没有安装过：
yum list installed MySQL* （有存在要卸载yum remove MySQL*）
rpm -qa | grep mysql*
查看有没有安装包：
yum list mysql*
2. 安装 MySQL
安装 MySQL 客户端：
yum -y install mysql
安装 MySQL 服务器端：
yum -y install mysql-server mysql-devel
3. 配置和启动
数据库字符集设置：
MySQL 配置⽂件/etc/myf中加⼊default-character-set=utf8
启动 MySQL 服务：
service mysqld start或者/etc/init.d/mysqld start
设置开机启动：
桃花源记译文添加开机启动：chkconfig --add mysqld;
开机启动：chkconfig mysqld on;
查看开机启动设置是否成功chkconfig --list | grep mysql* mysqld 0：关闭 1：关闭 2：启⽤ 3：启⽤ 4：启⽤ 5：启⽤ 6：关闭停⽌：停⽌ MySQL 服务：
service mysqld stop
4. MySQL 登陆等权限设置
登录 MySQL 数据库：
mysq -u root password 123456
⾸次使⽤创建root管理员和密码：
（mysql -u root -p输⼊密码即可？）
mysql -u root;
use mysql ;
update user set password=password("123456") where user="root";
flush privileges;
忘记密码：
service mysqld stop;
mysqld_safe --user=root --skip-grant-tables;
这⼀步骤执⾏的时候不会出现新的命令⾏，你需要重新打开⼀个窗⼝执⾏下⾯的命令
mysql -u root;
use mysql ;
update user set password=password("123456") where user="root";
flush privileges;
如果需要外⽹可以访问需要再做如下设置：
授权⽤户可以从远程登陆
grant all PRIVILEGES on *.* to root@'%' identified by 'pwd123';
flush privileges ;
5. 远程访问，开放防⽕墙的端⼝号 MySQL
⼀般开发测试我直接把防⽕墙关闭，⽣产的开发对应端⼝即可：
1 2 3 4 5 6su root
service iptables stop #关闭防⽕墙
service iptables status #验证是否关闭
chkconfig iptables off #关闭防⽕墙的开机⾃动运⾏
chkconfig –list | grep iptables #验证防⽕墙的开机⾃动运⾏
vim /etc/sysconfig/selinux# 禁⽤selinux，将SELINUX=disabled
6. Linux MySQL 的⼏个重要⽬录
数据库⽬录 /var/lib/mysql/
配置⽂件 /usr/share /mysql（mysql.server命令及配置⽂件）
相关命令 /usr/bin（mysqladmin mysqldump等命令）
启动脚本 /etc/rc.d/init.d/（启动脚本⽂件mysql的⽬录）
7. 删除 MySQL 数据库
如果使⽤的是 yum 安装的 mysql，需要删除的话，就使⽤如下命令：
yum -y remove mysql*
然后将 /var/lib/mysql⽂件夹下的所有⽂件都删除⼲净，最后再重新执⾏上⾯的安装步骤。yum 安装 MySQL 指定版本
默认yum只能安装mysql 5.1，我们可以⾃⼰配置通过yum安装5.6或者其他版本。
1. 查看系统⾥⾯有没有mysql 的repo（可以参考上⾯第⼀步卸载）
yum repolist all | grep mysql
2. 如果没有发现，则需要配置repo
只能有⼀个是 enabled=1的，其他的都得enabled=0。
张哲轩个人资料vim /pos.po
输⼊如下内容
[mysql-connectors-community]
name=MySQL Connectors Community
baseurl=sql/yum/mysql-connectors-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
[mysql-tools-community]
name=MySQL Tools Community
baseurl=sql/yum/mysql-tools-community/el/6/$basearch/
enabled=1
gpgcheck=1
新坟不过社2021年是哪一天gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
# Enable to use MySQL 5.5
[mysql55-community]
name=MySQL 5.5 Community Server
baseurl=sql/yum/mysql-5.5-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
# Enable to use MySQL 5.6
[mysql56-community]
name=MySQL 5.6 Community Server
baseurl=sql/yum/mysql-5.6-community/el/6/$basearch/
enabled=1
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
# Note: MySQL 5.7 is currently in development. For use at your own risk.
# Please read with sub pages: sql/doc/relnotes/mysql/5.7/en/
[mysql57-community-dmr]
name=MySQL 5.7 Community Server Development Milestone Release
baseurl=sql/yum/mysql-5.7-community/el/6/$basearch/
enabled=0
gpgcheck=1
gpgkey=file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
3. 再看看是否存在 MySQL 的 repo
yum repolist enabled | grep mysql
可以看到已经有了。
4. 签名
vim /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
写⼊如下内容
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.4.9 (SunOS)
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=443I
-----END PGP PUBLIC KEY BLOCK-----
5. 安装
yum install mysql-community-server -y
6. 启动
service mysqld start
7.登录mysql
先停⽌mysql服务
service mysqld stop
mysqld_safe --skip-grant-tables&
mysql -uroot -p
UPDATE user SET password=PASSWORD("***********") WHERE user='root'; FLUSH PRIVILEGES;
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