It is more convenient to use yum to install, please jump directly to "5"
1. Download mysql
wget http://cdn.mysql.com//Downloads/MySQL-5.7/mysql-5.7.10-linux-glibc2.5-x86_64.tar.gz
2. Unzip the installation
sudo groupadd mysql sudo useradd -r -g mysql -s /bin/false mysql sudo cd /usr/local sudo tar zxvf /path/to/mysql-VERSION-OS.tar.gz sudo ln -s full-path-to-mysql-VERSION-OS mysql sudo cd mysql sudo mkdir mysql-files sudo chmod 770 mysql-files sudo chown -R mysql . sudo chgrp -R mysql . sudo bin/mysql_install_db --user=mysql # Before MySQL 5.7.6 sudo bin/mysqld --initialize --user=mysql # MySQL 5.7.6 and up sudo bin/mysql_ssl_rsa_setup # MySQL 5.7.6 and up sudo chown -R root . sudo chown -R mysql data mysql-files sudo bin/mysqld_safe --user=mysql & # Next command is optional sudo cp support-files/mysql.server /etc/init.d/mysql.server
(1) Run sudo bin/mysqld --initialize --user=mysql to report an error
bin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
Solution
The installation packages libaio and libaio-devel are missing. Execute yum install libaio to automatically install these two packages
(2) Run sudo chown -R mysql data mysql-files to report an error
“chown: cannot access `data': No such file or directory”
(3) Run sudo bin/mysqld_safe --user=mysql & report an error
[1] 5509 [huanghaifeng@vm20251 mysql]$ Usage: grep [OPTION]... PATTERN [FILE]... Try `grep --help' for more information. grep: write error: Broken pipe 151229 19:17:05 mysqld_safe Logging to '/var/log/mysqld.log'. 151229 19:17:05 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 151229 19:18:45 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
View logs
2015-12-29T11:17:42.524999Z 0 [ERROR] InnoDB: Unable to lock ./ibdata1 error: 11 2015-12-29T11:17:42.525047Z 0 [Note] InnoDB: Check that you do not already have another mysqld process using the same InnoDB data or log files.
Solution
ps -ef | grep mysql kill -9 number sudo /etc/init.d/mysql restart
error again
ERROR! MySQL server process #5454 is not running! Starting MySQL. SUCCESS!
Solution
#Check the running status of the database /etc/init.d/mysql status #hint ERROR! MySQL is running but PID file could not be found #print MYSQL process ps to | grep mysql #KILL process kill -9 pid1 pid2 … #Restart MYSQL /etc/init.d/mysql start #Check the running status of mysql /etc/init.d/mysql status
3. Connect to the database
(1) Execute the command mysql to report an error
bash: mysql: command not found
Solution
sudo ln -s /usr/local/mysql/bin/mysql /usr/bin
Then execute mysql, and report an error
[huanghaifeng@vm20251 druid-0.8.2]$ mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
Solution
#Since mysql's default mysql.sock is in /var/lib/mysql/mysql.sock, but the linux system always goes to /tmp/mysql.sock to find it, so an error will be reported find / -name mysql.sock #输出/var/lib/mysql/mysql.sock 方法一： #直接指定mysql通道 mysql --socket=/var/lib/mysql/mysql.sock Welcome to the MySQL monitor. Commands end with ; or /g. Your MySQL connection id is 2 to server version: 5.0.22 Type 'help;' or '/h' for help. Type '/c' to clear the buffer. mysql> 方法二： # 创建符号连接，为mysql.sock增加软连接（相当于windows中的快捷方式）。 ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
执行还是报错
#方法一： ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (13) #方法二： ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (13)
查询mysql状态
/etc/rc.d/init.d/mysql.server status
报错信息
ERROR! MySQL is running but PID file could not be found
查很多原因，主要解决办法是kill进程，然后重启服务，实在是不能忍了，
我们改用yum安装吧。
四、删除已安装mysql
#查看安装的mysql yum list installed | grep mysql #卸载mysql sudo yum -y remove mysql-libs.x86_64 sudo yum -y remove mysql.x86_64 #检查是否删干净了 yum list installed | grep mysql whereis mysql
五、yum安装mysql
#查询yum中是否有mysql yum list | grep mysql #安装 sudo yum -y install mysql-server mysql mysql-devel #检查安装版本 rpm -qi mysql-server
启动，又在开始报错
[huanghaifeng@vm20251 local]$ sudo /etc/init.d/mysqld start MySQL Daemon failed to start. Starting mysqld: [FAILED] #查看日志 151230 15:30:31 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 151230 15:30:32 [Warning] '--default-character-set' is deprecated and will be removed in a future release. Please use '--character-set-server' instead. /usr/libexec/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13) 151230 15:30:32 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 151230 15:30:32 InnoDB: Initializing buffer pool, size = 8.0M 151230 15:30:32 InnoDB: Completed initialization of buffer pool 151230 15:30:32 InnoDB: Operating system error number 13 in a file operation. InnoDB: The error means mysqld does not have the access rights to InnoDB: the directory. InnoDB: File name ./ibdata1 InnoDB: File operation call: 'open'. InnoDB: Cannot continue operation. 151230 15:30:32 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
解决办法
vi /etc/my.cnf #将这一行datadir=/var/lib/mysql修改为 datadir=/data/db #然后用安全模式启动mysql /usr/bin/mysqld_safe &
六、mysql基本命令
#修改root用户名 mysqladmin -u root -p password "test123" #登录本机mysql mysql -u用户名 -p密码 #登录远程mysql mysql -h ip -u用户名 -p密码 #退出 quit #创建用户grant select on 数据库.* to 用户名@登录主机 identified by '密码' grant select,insert,update,delete on *.* to username@localhost identified by 'password'; #删除用户 delete from where user='用户名' and host='localhost'; #列出数据库 show databases; #删除数据库 drop database test; #创建数据库 create database test; #连接数据库 use test; #查看当前使用的数据库 select database(); #当前数据库包含的表信息 show tables; #创建表 create table MyClass(id int(4) not null primary key auto_increment,name char(20) not null,sex int(4) not null default '0',degree double(16,2)); #获取表结构 describe MyClass desc MyClass; show columns from MyClass; #删除表 drop table MyClass;