前言:
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查看有没有安装过:
yum list installed mysql*
rpm -qa | grep mysql*
查看有没有安装包:
yum list mysql*
安装mysql客户端:
yum install mysql
安装mysql 服务器端:
yum install mysql-server 在centOs7 中未找到
yum install mysql-devel
2、启动 && 停止
数据库字符集设置yuyum
mysql配置文件/etc/my.cnf中加入default-character-set=utf8
启动mysql服务:
service mysqld start或者/etc/init.d/mysqld start开机启动:
chkconfig -add mysqld,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:
service mysqld stop
3、登录
创建root管理员: mysqladmin -u root password 123456
登录: mysql -u root -p输入密码即可。
忘记密码: service mysqld stop
mysqld_safe --user=root --skip-grant-tables
mysql -u root
use mysql
update user set password=password("new_pass") where user="root";
flush privileges;
4、远程访问
开放防火墙的端口号
mysql增加权限:mysql库中的user表新增一条记录host为“%”,user为“root”。
5、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)
,
2.解压并复制
tar -xvf mysql-5.7.17-linux-glibc2.5-i686.tar.gzmv mysql-5.7.17-linux-glibc2.5-i686.tar.gz/* /usr/local/mysql/
3.创建data目录(很重要!) /usr/local/data/mysql-5.7.21
/usr/local/mysql/data
4.创建mysql用户和修改权限
groupadd mysql
useradd -g mysql -d /home/mysql -s /bin/bash mysql
chown -R mysql:mysql /usr/local/mysql
5.初始化数据
./bin/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir= /usr/local/mysql/data
复制配置文件到 /etc/my.cnf
cp -a ./support-files/my-default.cnf /etc/my.cnf
mysql的服务脚本放到系统服务中
cp -a ./support-files/mysql.server /etc/init.d/mysqld
修改my.cnf文件 (vim /etc/my.cnf)
# These are commonly set, remove the # and set as required.
basedir = /usr/local/mysql
datadir = /usr/local/mysql/data
port = 3306
# server_id = .....
socket = /tmp/mysql.sock
character-set-server = utf8
# Remove leading # to set options mainly useful for reporting servers.
# The server defaults are faster for transactions and fast SELECTs.
# Adjust sizes as needed, experiment to find the optimal values.
# join_buffer_size = 128M
# sort_buffer_size = 2M
# read_rnd_buffer_size = 2M
8.启动mysql
service mysqld start
ps -ef #查看是启动
ps -ef | grep mysql
连接:格式: mysql -h主机地址 -u用户名 -p用户密码
mysql –u root -p
10.修改密码
set password=password('123456');
3、退出MYSQL命令
exit (回车)
FAQERROR! The server quit without updating PID file (/usr/local/mysql/data/linux1.pid).
可能是mysql未正常关闭,系统表损坏
在/etc/my.cnf加上
myisam_recover_options=force,backup
初始化:
./bin/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir= /usr/local/mysql/data
报错
[WARNING] mysql_install_db is deprecated. Please consider switching to mysqld --initialize
2018-09-04 15:45:47 [ERROR] The data directory needs to be specified.
mysqld –initialize
执行mysqld –initialize
报错bash: mysqld: 未找到命令...
一般是环境变量中未加
连接:
mysql –u root -p
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)
因为初始化时会随机生成一个密码
如果没注意,可以在日志中找
grep "password" ./data/mariadb.log
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