CentOS 7.6下解压安装(非编译安装)mysql8.0.18
wget https://dev.mysql.com/get/Downloads/MySQL-8.0/mysql-8.0.18-el7-x86_64.tar.gz
1、建立mysql用户
# groupadd -r mysql
# useradd -g mysql -r -M -s /sbin/nologin mysql //这个mysql用户不能登录2、解压安装
# tar zxvf mysql-8.0.18-el7-x86_64.tar.gz
# mv mysql-8.0.18-el7-x86_64 /mnt/local/mysql3、修改目录权限
# cd /mnt/local/mysql/
# chown -R mysql:mysql ./ //修改当前目录为mysql用户
# mkdir -p /mnt/data/mysql
# chown -R mysql:mysql /mnt/data/mysql
# chown -R mysql:mysql /mnt/data/mysql/.4、开始安装
# cd /mnt/local/mysql/bin
# ./mysqld --initialize --user=mysql --basedir=/mnt/local/mysql --datadir=/mnt/data/mysql/如果报：
./mysqld: error while loading shared libraries: libnuma.so.1: cannot open shared object file: No such file or directory
解决办法为：
yum -y install numactl
如果报：
./mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
解决办法为：
yum install libaio-devel.x86_64
5、编辑my.cnf
vim /etc/my.cnf
[mysqld]
basedir=/mnt/local/mysql
datadir=/mnt/data/mysql
socket=/tmp/mysql.sock
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
character-set-server = utf8mb4
collation-server = utf8mb4_general_ci
port = 3369
max_connections=5000
wait_timeout=70
interactive_timeout=70
slow_query_log = 1
long-query-time = 1.0
slow_query_log_file = /mnt/logs/mysql/slow.log
sql_mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
default-authentication-plugin=mysql_native_password
[mysql]
default-character-set = utf8mb4
[client]
port=3369
max_allowed_packet=500M
socket=/tmp/mysql.sock
[mysqld_safe]
log-error=/mnt/logs/mysql/error.log
pid-file=/var/run/mariadb/mariadb.pid
!includedir /etc/my.cnf.d6、设置my.cnf相关的目录的权限
# mkdir -p /mnt/logs/mysql/
# chown -R mysql:mysql /mnt/logs/mysql/.
# touch /mnt/logs/mysql/error.log
# chmod -R 777 /mnt/logs/mysql/error.log
# touch /mnt/logs/mysql/slow.log
# chmod -R 777 /mnt/logs/mysql/slow.log7、为mysql配置环境变量
vim /etc/profile // 打开profile文件，在文件末尾添加下面三行
export MYSQL_HOME
MYSQL_HOME=/mnt/local/mysql
export PATH=$PATH:$MYSQL_HOME/lib:$MYSQL_HOME/bin执行：source /etc/profile
创建软连接
# ln -s /mnt/local/mysql/bin/mysql /usr/bin/mysql
Tip：删除软连接：rm -rf mysql，不要带/，否则会将源文件删除掉
8、设置为开机自启动项。
# cp /mnt/local/mysql/support-files/mysql.server /etc/init.d/mysql
# chmod +x /etc/init.d/mysql //添加可执行权限。
# chkconfig --add mysql // 注册启动服务输入chkconfig --list //查看是否添加成功
启动：service mysql start
停止：service mysql stop
重启：service mysql restart说明：basedir如果指定不是/usr/local/mysql目录则启动mysql时可能会报(在本次安装mysql8.0.18地未遇到，在之前遇到过)：
# service mysql start
/etc/init.d/mysql: line 239: my_print_defaults: command not found
/etc/init.d/mysql: line 259: cd: /usr/local/mysql: No such file or directory
Starting MySQLCouldn't find MySQL server (/usr/local/mysql/[FAILED]ld_safe)
解决办法：
由上面可知mysql的tar.gz安装包的默认安装目录为/usr/local/mysql， 这时候我们需要修改/support-files/mysql.server文件的basedir和datadir目录路径为我们环境所在的mysql的basedir和datadir路径， 如下：
# vim /etc/init.d/mysql
--------------------------
...
basedir=/mnt/local/mysql
datadir=/mnt/data/mysql
...
--------------------------
mysql -u root -p //登录进入mysql，然后提示输入密码并让修改系统自动生成的密码
mysql8设置用户新密码方式
> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your password';
> FLUSH PRIVILEGES设置允许root远程访问（慎用)
> use mysql
mysql> select host,user from user;
mysql> update user set host='%' where host = 'localhost';
mysql> FLUSH PRIVILEGES;