MySQL安装
MySQL的几个常用安装包：rpm（无法定义安装路径跟二进制区别）、源码(Cmake)、二进制免编译(编译过好的保存在一个目录下在打包压缩)没有特殊要求可以使用这种方法
cd /usr/local/src
wget http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz
tar zxvf mysql-5.6.35-linux-glibc2.5-x86_64.tar.gz
mv mysql-5.6.35-linux-glibc2.5-x86_64 /usr/local/mysql
cd /usr/local/mysql
useradd mysql
mkdir /data/ 存放mysql数据
./scripts/mysql_install_db --user=mysql --datadir=/data/mysql 初始化
cp support-files/my-default.cnf /etc/my.cnf
cp support-files/mysql.server /etc/init.d/mysqld
vi /etc/init.d/mysqld
定义basedir和datadir
basedir=/usr/local/mysql
datadir=/data/mysql

[root@localhost mysql]# chkconfig --add mysqld

[root@localhost mysql]# service mysqld start

[root@lsx-001 mysql]# netstat -lnpt

Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:25 0.0.0.0: LISTEN 1788/master
tcp 0 0 0.0.0.0:22 0.0.0.0: LISTEN 1111/sshd
tcp6 0 0 ::1:25 ::: LISTEN 1788/master
tcp6 0 0 :::3306 ::: LISTEN 20133/mysqld

如果没有/etc/init.d/启动文件可采用的启动方式如下图：

停止的方式：killall mysqld
killall 先停止当前的写读操作，把还没有写入磁盘的数据写入磁盘，在杀死进程

问题！！
[root@lsx-001 mysql]# ./scripts/mysql_install_db --user=mysql --datadir=/data/mysql
FATAL ERROR: please install the following Perl modules before executing ./scripts/mysql_install_db:
Data::Dumper
解决办法安装
[root@lsx-02 mysql]# yum install -y autoconf

[root@lsx-001 mysql]# yum list|grep -i perl |grep -i dumper
perl-Data-Dumper.x86_64 2.145-3.el7 base

2.
Installing MySQL system tables..../bin/mysqld: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directory

[root@lsx-02 mysql]# yum list |grep 'libaio'
[root@lsx-02 mysql]# yum install -y libaio-devel.x86_64

3.启动报错Starting MySQL.Logging to '/data/mysql/localhost.localdomain.err'.
./usr/local/mysql/bin/mysqld_safe: line 178: 2830 Killed nohup /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/data/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/data/mysql/localhost.localdomain.err --pid-file=/data/mysql/localhost.localdomain.pid < /dev/null > /dev/null 2>&1
ERROR! The server quit without updating PID file (/data/mysql/localhost.localdomain.pid).
解决办法：
1.cd /usr/local/mysql（进入mysql安装目录）
2.chown -R mysql.mysql .
3.su - mysql
4.cd /usr/local/mysql
5.scripts/mysql_install_db

4.登录mysql
mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
解决办法：
less /etc/my.cnf|grep sock
#socket = .....
vi /etc/my.cnf
socket = /tmp/mysql.sock  #添加该行
重启

5.启动错误后面提示什么文件没找到ERROR! MySQL server PID file could not be found!
就创建一个。比如：
touch /data/mysql/localhost.localdomain.pid