centos安装mysql5.6.33
在官网下载mysql-5.6.33-linux-glibc2.5-x86_64.tar.gz，上传到服务器，或者直接在服务器用wget 直接下载下来，安装步骤如下：
1.解压安装包
命令：tar zxvf mysql-5.6.33-linux-glibc2.5-x86_64.tar.gz
2.转移安装包，将安装包复制到/usr/local/mysql处
命令：cp -r mysql-5.6.33-linux-glibc2.5-x86_64 /usr/local/mysql
注意目标目录最后不能添加/
3.添加mysql组和添加mysql的用户
命令：
groupadd mysql
useradd -r -g mysql mysql
4.跳转到/usr/local/mysql
命令：cd /usr/local/mysql/
5.将mysql安装目录下的所有文件的拥有者修改为mysql用户
命令：chown -R mysql:mysql ./
6.安装mysql
命令：./scripts/mysql_install_db --user=mysql
可能出现的问题：
(1)出现问题A
a.报错信息：FATAL ERROR: please install the following Perl modules before executing ./scripts/mysql_install_db:
Data::Dumper
b.导致原因： 没有安装perl module(autoconf)
c.解决方案：安装autoconf
命令：yum installautoconf
(该命令视linux系统而定，在centos下为yum install，在unbuntu下为apt-get install)
(2)问题2
a.报错信息：Installing MySQL system tables..../bin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory
b.导致原因：没有安装libaio-devel
c.解决方案：安装libaio-devel
命令：yum install libaio-devel
(该命令视linux系统而定，在centos下为yum install，在unbuntu下为apt-get install)
7.将当前目录及其文件全部修改为root用户
命令：chown -R root:root ./
8.将安装包下的data目录的拥有者修改为mysql用户
命令：chown -R mysql:mysql data
9.添加开机自启动
命令：cp support-files/mysql.server /etc/init.d/mysql
10.将刚添加的自启动程序添加可执行权限
命令：chmod +x /etc/init.d/mysql
11.添加mysql服务
命令：chkconfig --add mysql
12.检测服务是否可用
命令：chkconfig --list
若mysql下的3，4，5均为on为成功，网上说，若不成功可填入：chkconfig --level 345 mysql on
（暂未尝试过）
13.启动mysql
命令：service mysql start
可能出现的错误：（若出现问题，需要进入14步骤修改密码）
(1)问题一
a.问题显示
Starting MySQL.touch: cannot touch '/var/log/mariadb/mariadb.log': No such file or directory
chmod: cannot access '/var/log/mariadb/mariadb.log': No such file or directory
touch: cannot touch '/var/log/mariadb/mariadb.log': No such file or directory
chown: cannot access '/var/log/mariadb/mariadb.log': No such file or directory
/usr/local/mysql/bin/mysqld_safe: line 129: /var/log/mariadb/mariadb.log: No such file or directory
/usr/local/mysql/bin/mysqld_safe: line 166: /var/log/mariadb/mariadb.log: No such file or directory
touch: cannot touch '/var/log/mariadb/mariadb.log': No such file or directory
chown: cannot access '/var/log/mariadb/mariadb.log': No such file or directory
chmod: cannot access '/var/log/mariadb/mariadb.log': No such file or directory
/usr/local/mysql/bin/mysqld_safe: line 129: /var/log/mariadb/mariadb.log: No such file or directory
The server quit without updating PID file (/var/lib/mysql/i[FAILED]3vu81gmebyu2tZ.pid).
b.产生原因:log目录没有创建/var/log/mariadb/
c.解决方案:创建log目录文件夹
命令：mkdir /var/log/mariadb
14.修改密码：
命令：./bin/mysqladmin -u root password '这里填写你的密码'
可能出现问题：
（1）问题一
a.错误信息：
./bin/mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/tmp/mysql.sock' exists!
b.解决方案
首先，关闭mysql服务
其次，修改配置文件（5.6.33是my.cnf，部分为my.conf），在配置文件处的[client]下添加socket=/var/lib/mysql/mysql.sock，如图所示
最后，重新启动mysql,
命令：/usr/local/mysql/bin/mysqld_safe& service mysql start
14.无法使用14直接修改密码的继续这一步骤
a.进入刚刚安装目录下的bin
命令：cd /usr/local/mysql/bin
b.进入mysql
命令：./mysql -u root -p
密码为空
c.在mysql控制台下：
use mysql;
update user set password=password("你的密码") where user = 'root' and host = 'localhost';
flush privileges;
