新装mysql版本  mysql-5.5.56.tar.gz        cmake-2.8.6.tar.gz   系统为centos6.8

编译后启动报错 ：

 Starting MySQL..The server quit without updating PID file ([FAILED]al/mysql/data/iZwz92ycxa8b5l94ufhgbcZ.pid).
tail -f /usr/local/mysql/data/iZwz92ycxa8b5l94ufhgbcZ.err 
查看日志文件出现如下一条：

180419 12:27:49 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist
经过查阅资料得知。要敲如下命令解决:

cd  /usr/local/mysql/scripts/
./mysql_install_db –usrer=mysql datadir=/usr/local/mysql

出现错误：

FATAL ERROR: Could not find ./bin/my_print_defaults  （本应该存在于安装mysql目录下）

If you compiled from source, you need to run 'make install' to
copy the software into the correct location ready for operation.

If you are using a binary release, you must either be at the top
level of the extracted archive, or pass the --basedir option
pointing to that location.
 告诉我没有找到 ./bin/my_print_defaults  可在ls -l   bin下有

之后百度一下有各种方法其中一种小白没有试过 附上地址：

https://blog.csdn.net/m0_37975886/article/details/78329341?locationNum=7&fps=1

有朋友尝试过还望告诉小白一起学习

我采用的另外一种方法：

/usr/local/mysql/scripts/mysql_install_db --user=mysql --basedir=/usr/local/mysql --datadir=/usr/local/mysql/data &
 

启动：

[root@iZwz92ycxa8b5l94ufhgbcZ bin]# service mysqld start
Starting MySQL..                                           [  OK  ]
 

因为是新安装所以直接admin形式修改密码 mysqladmin -u root password "密码"

select host, user from user;
+-------------------------+------+
| host                    | user |
+-------------------------+------+
| 127.0.0.1               | root |
| ::1                     | root |
| izwz92ycxa8b5l94ufhgbcz |      |
| izwz92ycxa8b5l94ufhgbcz | root |
| localhost               |      |
| localhost               | root |
+-------------------------+------

需要远程连接需要新授权：

进入数据库：

 GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY '密码' WITH GRANT OPTION;

（百分号也可换成允许访问的ip  配合iptables使用）

flush privileges;   刷新权限