源码编译安装MySQL-5.6/mysql-5.6.39------踩了无数坑，重装了十几次服务器才会的,不容易啊！

1.切换到src目录

cd /usr/local/src/

2. 下载mysql免编译二进制包

免编译的mysql二进制包5.6源码包：

wget http://mirrors.163.com/mysql/Downloads/MySQL-5.6/mysql-5.6.39-linux-glibc2.12-x86_64.tar.gz

(https://dev.mysql.com/get/Downloads/MySQL-5.6/mysql-5.6.43-linux-glibc2.12-x86_64.tar.gz   --最新地址)

(http://mirrors.sohu.com/mysql/MySQL-5.6/mysql-5.6.39-linux-glibc2.12-x86_64.tar.gz)

tar -zxvf  mysql-5.6.39-linux-glibc2.12-x86_64.tar.gz

3. 把 mysql-5.6.39-linux-glibc2.12-x86_64.tar.gz目录下所有文件   移到 /usr/local/mysql 位置

mv mysql-5.6.39-linux-glibc2.12-x86_64/* /usr/local/mysql

4.建立MySql用户,因为启动MySQL需要改用户

useradd -s  /sbin/nologin mysql

cd /usr/local/mysql

5.创建datadir，数据库文件会放到这里面

mkdir -p /data/mysql

6. 更改权限,不更改后续操作就会出问题

chown  -R mysql:mysql  /data/mysql

7. yum install libaio* -y

二进制安装mysql初始化出现：Installing MySQL system tables.../usr/local/mysql/bin/mysqld: error while loading shared
原因：缺少libaio库文件
解决方法：yum install libaio* -y

8. yum -y install numactl

bin/mysqld: error while loading shared libraries: libnuma.so.1: 安装mysql
如果安装mysql出现了以上的报错信息.这是却少numactl这个时候如果是Centos就yum -y install numactl就可以解决这个问题了.
ubuntu的就sudo apt-get install numactl就可以解决这个问题了

9.  编译安装

yum install -y perl-Module-Install

./scripts/mysql_install_db --user=mysql --datadir=/data/mysql

如果在/data/mysql目录下生成几个文件和目录,说明执行成功;或者在执行完成最后一条命令后,马上执行echo $? 看输出结果是否为0

10. 首先赋值配置文件,如下所示:

cp support-files/my-default.cnf  /etc/my.cnf

cp:是否覆盖"/etc/my.cnf"? y

因为是系统默认就有/etc/my.cnf，所以会提示是否覆盖,直接按"y"即可,

11. 修改配置文件 ,如下所示:

vim /etc/my.cnf

---------------------------------------------------------------------------------------------------------------------------------------------

[mysqld]

# Remove leading # and set to the amount of RAM for the most important data
# cache in MySQL. Start at 70% of total RAM for dedicated server, else 10%.
#innodb_buffer_pool_size = 128M

# Remove leading # to turn on a very important data integrity option: logging
# changes to the binary log between backups.
#log_bin =

log_bin = /data/mysql/error.log
pid-file=/data/mysql/pid_file.pid

# These are commonly set, remove the # and set as required.
basedir = /usr/local/mysql
datadir = /data/mysql
port = 3306
server_id = 128

socket = /tmp/mysql.sock

key_buffer=16K
table_open_cache=4
query_cache_limit=256K
query_cache_size=4M
max_allowed_packet=1M
sort_buffer_size=64K
read_buffer_size=256K
thread_stack=64K
innodb_buffer_pool_size = 56M

# 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

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

---------------------------------------------------------------------------------------------------------------------

12. 然后复制启动脚本文件并修改其属性

cp support-files/mysql.server /etc/init.d/mysqld

chmod 755 /etc/init.d/mysqld

13. 修改启动脚本 （这步废除）

vim /etc/init.d/mysqld

需要修改的地方有 datadir=/data/mysql

14. 把启动脚本加入系统服务项,设定开机并启动mysql

a . 把mysqld服务加入到系统服务列表中,

chkconfig --add mysqld

b .使其开机就启动

chkconfig mysqld on

c .启动服务

service mysqld start

看见success,说明mysql已经启动成功了

15. 看看有没有监听3306端口

netstat -lnp|grep 3306

16.进入mysql

/usr/local/mysql/bin/mysql -uroot -p

show databases;

17. Linux下修改Mysql的用户(root)的密码 (第一次进入不需要密码，直接mysql -uroot -p 进来该密码)

通过登录mysql系统，
# mysql -uroot -p
Enter password: 【输入原来的密码】 (下面的passedorD("test")表示数据库密码)
mysql>use mysql;
mysql> update user set password=passworD("test") where user='root';

# 远程登录密码 (下面的test表示数据库密码)

mysql>GRANT ALL ON *.* to root@'%' IDENTIFIED BY 'test';

mysql> flush privileges;
mysql> exit;

--------------------------------------------下面是mysql二进制源码包下载地址------------------------------------------------------------------------------------

下载地址: https://dev.mysql.com/downloads/mysql/5.6.html#downloads

--------------------------------------问题一--------------------------------------------------------------

出现如下问题，在/data/mysql 下创建个 VM_0_3_centos.pid     1:  (touch VM_0_3_centos.pid)

2 然后去 apache 下重启apache   之后 /data/mysql/ 下的VM_0_3_centos.pid用户名，用户组，改变了，重启msyql，创建VM_0_3_centos.pid就不会消失，死活创建不了

cd /usr/local/apache/bin/

./apachectl start