大家好,又见面了,我是你们的朋友全栈君。
一 查看linux操作系统版本和系统内核版本
代码语言:javascript复制[root@nfs_client ~]# cat /etc/redhat-release 查看操作系统版本
CentOS Linux release 7.5.1804 (Core)
[root@nfs_client ~]# uname -r 查看系统内核版本
3.10.0-862.el7.x86_64
二 下载对应版本的MySQL安装文件
1、下载地址;https://dev.mysql.com/downloads/mysql/
2、选择对应的Linux版本和x86/x64进行下载
可以选择 RPM Bundle,下载完记得解压 tar -xvf xxx.tar
代码语言:javascript复制[root@nfs_client ~]# wget https://dev.mysql.com/get/Downloads/MySQL-5.7/mysql-5.7.22-1.el7.x86_64.rpm-bundle.tar
也可以细化下载,下载须要的mysql组件,有4个:分别是 server、client、common、libs
三 卸载旧版本的MySql (没有的话,则跳过此步骤)
1、查看旧版本MySql
rpm -qa | grep mysql
将会列出旧版本MySql的组件列表,如:
我的电脑这里只显示一个,有可能会有多个。
2、逐个删除掉旧的组件
使用命令rpm -e –nodeps {-file-name}进行移除操作,移除的时候可能会有依赖,要注意一定的顺序。
第一次没有删除成功是因为nodeps 前面的两个中划线有一个写成了中文。
四 使用 rpm 命令安装MySql组件
使用命令rpm -ivh {-file-name}进行安装操作。
按照依赖关系依次安装rpm包 依赖关系依次为common→libs→client→server
rpm -ivh mysql-community-common-5.7.22-1.el7.x86_64.rpm rpm -ivh mysql-community-libs-5.7.22-1.el7.x86_64.rpm rpm -ivh mysql-community-client-5.7.22-1.el7.x86_64.rpm rpm -ivh mysql-community-server-5.7.22-1.el7.x86_64.rpm
注:ivh中, i-install安装;v-verbose进度条;h-hash哈希校验
在安装 mysql-community-libs-5.7.22-1.el7.x86_64.rpm 时有可能会报错:mysql依赖错误
[root@nfs_client tools]# rpm -ivh mysql-community-libs-5.7.22-1.el7.x86_64.rpm warning: mysql-community-libs-5.7.22-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY error: Failed dependencies: mysql-community-common(x86-64) >= 5.7.9 is needed by mysql-community-libs-5.7.22-1.el7.x86_64 mariadb-libs is obsoleted by mysql-community-libs-5.7.22-1.el7.x86_64
解决:清除yum里所有mysql依赖包
代码语言:javascript复制[root@nfs_client tools]# rpm -qa|grep mysql
[root@nfs_client tools]# yum remove mysql-libs
注意:
有的系统可能不太一样,没有mysql-libs,而是mariadb-libs,此时要移除的则是mariadb-libs
[root@nfs_client tools]# rpm -qa|grep mariadb
[root@nfs_client tools]# yum remove mariadb-libs
清除完yum里所有mysql的依赖包后,再次安装mysql组件就不会报错了:
代码语言:javascript复制[root@nfs_client tools]# ls
mysql-community-client-5.7.22-1.el7.x86_64.rpm mysql-community-libs-5.7.22-1.el7.x86_64.rpm
mysql-community-common-5.7.22-1.el7.x86_64.rpm mysql-community-server-5.7.22-1.el7.x86_64.rpm
[root@nfs_client tools]# rpm -ivh mysql-community-common-5.7.22-1.el7.x86_64.rpm
warning: mysql-community-common-5.7.22-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:mysql-community-common-5.7.22-1.e################################# [100%]
[root@nfs_client tools]# rpm -ivh mysql-community-libs-5.7.22-1.el7.x86_64.rpm
warning: mysql-community-libs-5.7.22-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:mysql-community-libs-5.7.22-1.el7################################# [100%]
[root@nfs_client tools]# rpm -ivh mysql-community-client-5.7.22-1.el7.x86_64.rpm
warning: mysql-community-client-5.7.22-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:mysql-community-client-5.7.22-1.e################################# [100%]
[root@nfs_client tools]# rpm -ivh mysql-community-server-5.7.22-1.el7.x86_64.rpm
warning: mysql-community-server-5.7.22-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing... ################################# [100%]
Updating / installing...
1:mysql-community-server-5.7.22-1.e################################# [100%]
[root@nfs_client tools]#
注意细节:
1> 执行 yum remove mysql-libs 命令后,会自动删除掉 /etc/ 下的 my.cnf 文件 2> 对于安装mysql组件,只有安装了 mysql-community-server-5.7.22-1.el7.x86_64.rpm 组件,才会: a). 在 /etc/下生成 my.cnf 文件 和 my.cnf.d 文件夹
b). 在/var/lib/下生产以下三个文件夹
c). 在/var/log/ 下生成 mysqld.log 文件
d). 在/var/run/ 下生成 mysqld 目录
个别情况:
个别情况1:
在阿里云ECS云服务器上安装mysql5.7,当安装 mysql-community-server-5.7.22-1.el7.x86_64.rpm 时报错,报错如下:
[root@i3467544tdsxfrZ ~]# rpm -ivh mysql-community-server-5.7.22-1.el7.x86_64.rpm warning: mysql-community-server-5.7.22-1.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY error: Failed dependencies: libaio.so.1()(64bit) is needed by mysql-community-server-5.7.22-1.el7.x86_64 libaio.so.1(LIBAIO_0.1)(64bit) is needed by mysql-community-server-5.7.22-1.el7.x86_64 libaio.so.1(LIBAIO_0.4)(64bit) is needed by mysql-community-server-5.7.22-1.el7.x86_64
真正原因:
真正的原因是 MySQL依赖libaio,所以先要安装libaio,我们通过 rpm -qa|grep libaio 命令查看一下,如图:
经过对比发现,无法正常安装mysql-community-server-5.7.22-1.el7.x86_64的服务器的确没有安装libaio
所以,解决法案就是:
安装libaio
代码语言:javascript复制[root@iZbp1845cet96se1qmb5ekZ ~]# yum -y install libaio
安装libaio后,再重新安装一次mysql-community-server-5.7.22-1.el7.x86_64.rpm,此时就能正常安装了
个别情况2:
比如解决了“个别情况1”,但在启动mysql的时候,启动不起来,或启动后,去查找临时密码,使用命令没反应。查看日志mysqld.log(可在/etc/my.cnf中查找到mysqld.log的配置位置),报如下错误,此时怎么解决?
[ERROR] Fatal error: Can’t open and lock privilege tables: Table ‘mysql.user’ doesn’t exist
此时,1>先通过rpm -e –nodeps xxx 卸载掉server,卸载后删除datadir目录,2>卸载后查看 /etc/my.cnf 中,datadir的配置情况,将datedir目录删除,3>最后通过命令rpm -ivh xxx 重新安装server,此时就能正常使用mysql了
命令代码如下:
[root@izbp1845cet96se1qmb5ekz ~]# rpm -e –nodeps mysql-community-server-5.7.22-1.el7.x86_64 [root@izbp1845cet96se1qmb5ekz ~]# cat /etc/my.cnf xxxxxxxxxxxxx datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock xxxxxxxxxxxxxxx [root@izbp1845cet96se1qmb5ekz ~]# cd /var/lib [root@izbp1845cet96se1qmb5ekz lib]# rm -rf mysql [root@izbp1845cet96se1qmb5ekz ~]# rpm -ivh mysql-community-server-5.7.22-1.el7.x86_64.rpm [root@izbp1845cet96se1qmb5ekz ~]# systemctl start mysqld.service [root@izbp1845cet96se1qmb5ekz ~]# ps -ef|grep mysql root 3306 1068 0 14:34 pts/0 00:00:00 mysql -uroot -p mysql 27009 1 1 15:26 ? 00:00:00 /usr/sbin/mysqld –daemonize –pid-file=/var/run/mysqld/mysqld.pid root 27038 26239 0 15:27 pts/6 00:00:00 grep –color=auto mysql
五 登录并创建MySql密码
1 启动MySql
安装完后,使用命令 service mysqld start 或 systemctl start mysqld.service 启动MySQL服务。(如果mysql服务无法启动,就重启一下系统)
systemctl start mysqld.service 启动mysql systemctl status mysqld.service 查看mysql状态 systemctl stop mysqld.service 关闭mysql
查看mysql进程 ps -ef|grep mysql 查看3306端口 netstat -anop|grep 3306
eg:
[root@nfs_client tools]# ps -ef|grep mysql mysql 4102 1 0 14:29 ? 00:00:01 /usr/sbin/mysqld –daemonize –pid-file=/var/run/mysqld/mysqld.pid root 4806 1464 0 14:43 pts/0 00:00:00 grep –color=auto mysql [root@nfs_client tools]# ps -ef|grep mysqld mysql 4102 1 0 14:29 ? 00:00:01 /usr/sbin/mysqld –daemonize –pid-file=/var/run/mysqld/mysqld.pid root 4829 1464 0 14:43 pts/0 00:00:00 grep –color=auto mysqld [root@nfs_client tools]# firewall-cmd –state not running [root@nfs_client tools]# netstat -anop|grep 3306 tcp6 0 0 :::3306 :::* LISTEN 4102/mysqld off (0.00/0/0) [root@nfs_client tools]#
2 登陆mysql修改root密码
由于MySQL5.7.4之前的版本中默认是没有密码的,登录后直接回车就可以进入数据库,进而进行设置密码等操作。其后版本对密码等安全相关操作进行了一些改变,在安装过程中,会在安装日志中生成一个临时密码。
怎么找到这个临时密码呢?
使用:
代码语言:javascript复制grep 'temporary password' /var/log/mysqld.log
即可查询到类似于如下的一条日志记录:
代码语言:javascript复制[root@nfs_client tools]# grep 'temporary password' /var/log/mysqld.log # 在/var/log/mysqld.log文件中搜索字段‘temporary password’
2018-07-18T06:02:23.579753Z 1 [Note] A temporary password is generated for root@localhost: n(jPp4l-C33#
n(jPp4l-C33#即为登录密码。使用这个随机密码登录进去,然后修改密码,使用命令:
mysql -uroot -p
代码语言:javascript复制[root@nfs_client tools]# mysql -uroot -p
Enter password: # 在这里输入密码
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 2
Server version: 5.7.22
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> quit # 输入quit 或 exit 都能退出mysql
Bye
执行下面的命令修改MySql root密码
在5.6后,mysql内置密码增强机制,低强度密码会报错:
代码语言:javascript复制ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
mysql> alter user root@localhost identified by 'sdbrk';
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
或
mysql> set password for root@localhost=password('sdbrk');
ERROR 1819 (HY000): Your password does not satisfy the current policy requirements
解决方案如下:
可参见:ERROR 1819 (HY000):Your password does not satisfy the current policy requirments
step1: 更改策略,设置 validate_password_policy=0;
代码语言:javascript复制mysql> set global validate_password_policy=0; # 此时,新密码长度大于等于8位才有效,否则报错
修改有效密码长度:
代码语言:javascript复制mysql> set global validate_password_length=1;
Query OK, 0 rows affected (0.00 sec)
不管设置 validate_password_length=1,还是2,3,4 ,‘有效密码长度’这个参数的实际值都是4。超过4后设置是多少实际就是多少。
step2:重设密码:
代码语言:javascript复制mysql> set password for root@localhost=password('9527');
Query OK, 0 rows affected, 1 warning (0.00 sec)
此时,虽然防火墙我时关着的,但root用户只能用于本机访问,不能用于远程访问,否则会报以下错误。因此,接下来要做的是授予root用户远程访问权限。
查看当前授予过的权限: use mysql; select user,host from user;
注意:mysql默认会包含四个数据库,千万不能删
本机上:
代码语言:javascript复制mysql> use mysql;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select user,host from user;
--------------- -----------
| user | host |
--------------- -----------
| root | % |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
--------------- -----------
4 rows in set (0.00 sec)
mysql> show grants;
---------------------------------------------------------------------
| Grants for root@localhost |
---------------------------------------------------------------------
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION |
---------------------------------------------------------------------
2 rows in set (0.00 sec)
step3: 授予root用户远程访问权限:
代码语言:javascript复制mysql> grant all privileges on *.* to root@'%' identified by '9527';
Query OK, 0 rows affected, 1 warning (0.05 sec)
step4: 刷新权限,使设置生效, OK。
代码语言:javascript复制mysql> flush privileges;
Query OK, 0 rows affected (0.36 sec)
在远程机器上测试远程连接: mysql -h192.168.0.241 -uroot -p
代码语言:javascript复制[root@localhost ~]# mysql -h192.168.0.241 -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 20
Server version: 5.7.22 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> show grants;
-------------------------------------------
| Grants for root@% |
-------------------------------------------
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' |
-------------------------------------------
1 row in set (0.01 sec)
mysql>
mysql中可以给一个用户授予如select,insert,update,delete等其中的一个或者多个权限,主要使用grant命令,用法格式为: grant 权限 on 数据库对象 to 用户 一、grant 普通数据用户,查询、插入、更新、删除 数据库中所有表数据的权利。 grant select on testdb.* to common_user@’%’ grant insert on testdb.* to common_user@’%’ grant update on testdb.* to common_user@’%’ grant delete on testdb.* to common_user@’%’ 或者,用一条 MySQL 命令来替代: grant select, insert, update, delete on testdb.* to common_user@’%’
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