CentOS7.4安装足球竞猜源码下载MySQL踩坑记录

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ntOS7.4安装MySQL足球竞猜源码下载dsluntan.com 企娥3393756370足球竞猜源码下载时网上的文档虽然多但是不靠谱的也多, 可能因为版本与时间的问题, 所以记录下自己踩坑的过程, 如果你发现进坑了, 欢迎参考本篇文章:)第一次尝试遇到的问题:

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

尝试卸载重新安装, 参考, 步骤:

1.查看yum是否安装过mysql

yum list installed mysql*

yum list installed | grep mysql*

没有显示结果, 说明yum中没有安装mysql(对yum与rpm并不是很了解, 如有错误欢迎指出)
2.删除配置文件与文件夹

rm -rf /var/lib/mysql

rm /etc/my.cnf

3.查看rpm中的安装并卸载

rpm -qa | grep -i mysql

以下根据上面命令显示的列表修改

rpm -e mysql-community-server-5.7.21-1.el7.x86_64 mysql-community-common-5.7.21-1.el7.x86_64 mysql-community-libs-5.7.21-1.el7.x86_64 mysql57-community-release-el7-11.noarch mysql-community-client-5.7.21-1.el7.x86_64  mysql-community-libs-compat-5.7.21-1.el7.x86_64 --nodeps

3.清除余项

whereis mysql

删除上面命令显示的路径

rm -rf /usr/share/mysql/

4.删除配置

rm -rf /usr/my.cnf

rm -rf /root/.mysql*

# 无结果

# 笔者机器上无结果
chkconfig --list | grep -i mysql
chkconfig --del mysqld
systemctl list-dependencies | grep -i mysql

5.重新安装

下载mysql源并安装到rpm:

wget http://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm rpm -ivh mysql57-community-release-el7-11.noarch.rpm

更新yum并安装mysql(时间较长):

# 更新yum软件包
yum check-update
# 更新系统
yum update
# 安装mysql
yum install mysql mysql-server

注意事项
更新yum后可能需要重新编辑

/usr/bin/yum

文件头(因为笔者将默认的python更改为python3), 编辑后再次安装即可, 出现的错误如下:

[root@centos ~]# yum install mysql mysql-server
File "/usr/bin/yum", line 30
except KeyboardInterrupt, e:
^
SyntaxError: invalid syntax

安装完成后配置

未跳过

grant-tables

授权表时启动MySQL会出现:

ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

这里需要修改root的密码, 这条命令是给mysql加上一个启动参数

--skip-grant-tables

, 顾名思义,就是在启动mysql时不启动

grant-tables

授权表, 用于忘记管理员密码后的修改

/usr/local/mysql/bin/mysqld_safe --skip-grant-tables --user=mysql &

但是, 

MySQL 5.7.6

 版本开始默认是不安装

mysqld_safe

了, 以下为新方法:
1.停止 mysql 服务

service mysqld stop

2.设置 mysqld 选项 

--skip-grant-tables

参数:

systemctl set-environment MYSQLD_OPTS='--skip-grant-tables'

3.重新启动mysql

systemctl start mysqld

4.执行 

mysql -u root

 登录mysql并更改密码

[root@centos ~]# mysql -uroot
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.7.21 MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> UPDATE mysql.user
-> SET authentication_string = PASSWORD('toor'), password_expired = 'N'
-> WHERE User = 'root' AND Host = 'localhost';
Query OK, 1 row affected, 1 warning (0.65 sec)
Rows matched: 1  Changed: 1  Warnings: 1

mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

mysql>

password_expired = 'N'

过期状态设置为No, 

flush privileges;

 刷新权限记录, 详见5.设置完密码后去掉

--skip-grant-tables

参数, 重启mysql即可用设置的密码登录root用户

systemctl unset-environment MYSQLD_OPTS

systemctl restart mysqld

mysql -uroot -p