CentOS下yum安装mysql

　　其实跟windows下安装过程差别不大，就是下载为了方便使用了yum的方式。安装前先确认下系统是否还安装mysql，卸载是否不完全，再去官网(http://dev.mysql.com/downloads/repo/yum/)选一个yum版本，这里我选了最新的mysql80-community-release-el7-3.noarch.rpm，通过wget下载后就可以安装mysql服务端了，然后就算完了。是不是很简单？当然为了使用方便，跟windows的一样，最好再改下初始密码。下面看下操作记录：

1、检查下是否已下载还有卸载残留

# rpm -qa | grep mysql
# find / -name mysql
/etc/selinux/targeted/active/modules//mysql
/usr/lib64/mysql
/usr/share/mysql

　　看来还是有的，通过rm -rf将以上目录删掉即可，另外顺便把配置文件/etc/my.cnf也删掉吧，用rm -f。

2、安装yum

# wget http://repo.mysql.com/mysql80-community-release-el7-3.noarch.rpm
---- ::--  http://repo.mysql.com/mysql80-community-release-el7-3.noarch.rpm
Resolving repo.mysql.com (repo.mysql.com)... 23.41.23.231
Connecting to repo.mysql.com (repo.mysql.com)|23.41.23.231|:... connected.
HTTP request sent, awaiting response...  OK
Length:  (25K) [application/x-redhat-package-manager]
Saving to: 鈥榤ysql80-community-release-el7-.noarch.rpm鈥

%[==============================================================================================================================>] ,      --.-K/s   in .1s    

-- :: ( KB/s) - 鈥榤ysql80-community-release-el7-.noarch.rpm鈥saved [/]

3、安装mysql

# sudo rpm -Uvh mysql80-community-release-el7-.noarch.rpm
warning: mysql80-community-release-el7-.noarch.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY
Preparing...                          ################################# [%]
Updating / installing...
   :mysql80-community-release-el7-  ################################# [%]
[root@VM_0_17_centos mysql]# yum install -y mysql-community-server
Loaded plugins: fastestmirror, langpacks
epel                                                                                                                                             | 4.7 kB  ::
extras                                                                                                                                           | 3.4 kB  ::
mysql-connectors-community                                                                                                                       | 2.5 kB  ::
mysql-tools-community                                                                                                                            | 2.5 kB  ::
mysql80-community                                                                                                                                | 2.5 kB  ::
os                                                                                                                                               | 3.6 kB  ::
updates                                                                                                                                          | 3.4 kB  ::
(/): extras//x86_64/primary_db                                                                                                                |  kB  ::
(/): epel//x86_64/updateinfo                                                                                                                  |  kB  ::
(/): epel//x86_64/primary_db                                                                                                                  | 6.7 MB  ::
(/): mysql-connectors-community/x86_64/primary_db                                                                                              |   kB  ::
(/): mysql-tools-community/x86_64/primary_db                                                                                                   |   kB  ::
(/): mysql80-community/x86_64/primary_db                                                                                                       |   kB  ::
(/): updates//x86_64/primary_db                                                                                                               | 4.2 MB  ::
Determining fastest mirrors
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 :8.0.-.el7 will be installed
--> Processing Dependency: mysql-community-common(x86-) = 8.0.-.el7 for package: mysql-community-server-8.0.-.el7.x86_64
--> Processing Dependency: mysql-community-client(x86-) >= 8.0. for package: mysql-community-server-8.0.-.el7.x86_64
--> Processing Dependency: libnuma.so.(libnuma_1.)(64bit) for package: mysql-community-server-8.0.-.el7.x86_64
--> Processing Dependency: libnuma.so.(libnuma_1.)(64bit) for package: mysql-community-server-8.0.-.el7.x86_64
--> Processing Dependency: libnuma.so.()(64bit) for package: mysql-community-server-8.0.-.el7.x86_64
--> Running transaction check
---> Package mysql-community-client.x86_64 :8.0.-.el7 will be installed
--> Processing Dependency: mysql-community-libs(x86-) >= 8.0. for package: mysql-community-client-8.0.-.el7.x86_64
---> Package mysql-community-common.x86_64 :8.0.-.el7 will be installed
---> Package numactl-libs.x86_64 :2.0.-.el7 will be installed
--> Running transaction check
---> Package mariadb-libs.x86_64 :5.5.-.el7 will be obsoleted
--> Processing Dependency: libmysqlclient.so.()(64bit) for package: :postfix-2.10.-.el7.x86_64
--> Processing Dependency: libmysqlclient.so.(libmysqlclient_18)(64bit) for package: :postfix-2.10.-.el7.x86_64
---> Package mysql-community-libs.x86_64 :8.0.-.el7 will be obsoleting
--> Running transaction check
---> Package mysql-community-libs-compat.x86_64 :8.0.-.el7 will be obsoleting
---> Package postfix.x86_64 :2.10.-.el7 will be updated
---> Package postfix.x86_64 :2.10.-.el7 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

========================================================================================================================================================================
 Package                                            Arch                          Version                                Repository                                Size
========================================================================================================================================================================
Installing:
 mysql-community-libs                               x86_64                        8.0.-.el7                           mysql80-community                        3.0 M
     replacing  mariadb-libs.x86_64 :5.5.-.el7
 mysql-community-libs-compat                        x86_64                        8.0.-.el7                           mysql80-community                        2.1 M
     replacing  mariadb-libs.x86_64 :5.5.-.el7
 mysql-community-server                             x86_64                        8.0.-.el7                           mysql80-community                         M
Installing for dependencies:
 mysql-community-client                             x86_64                        8.0.-.el7                           mysql80-community                          M
 mysql-community-common                             x86_64                        8.0.-.el7                           mysql80-community                         k
 numactl-libs                                       x86_64                        2.0.-.el7                            os                                         k
Updating for dependencies:
 postfix                                            x86_64                        :2.10.-.el7                         os                                       2.4 M

Transaction Summary
========================================================================================================================================================================
Install   Packages (+ Dependent packages)
Upgrade             (  Dependent package)

Total download size:  M
Downloading packages:
Delta RPMs disabled because /usr/bin/applydeltarpm not installed.
warning: /var/cache/yum/x86_64//mysql80-community/packages/mysql-community-common-8.0.-.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY: ETA
Public key for mysql-community-common-8.0.-.el7.x86_64.rpm is not installed
(/): mysql-community-common-8.0.-.el7.x86_64.rpm                                                                                            |  kB  ::
(/): mysql-community-libs-8.0.-.el7.x86_64.rpm                                                                                              | 3.0 MB  ::
(/): mysql-community-libs-compat-8.0.-.el7.x86_64.rpm                                                                                       | 2.1 MB  ::
(/): numactl-libs-2.0.-.el7.x86_64.rpm                                                                                                       |   kB  ::
(/): postfix-2.10.-.el7.x86_64.rpm                                                                                                           | 2.4 MB  ::
(/): mysql-community-client-8.0.-.el7.x86_64.rpm                                                                                            |   MB  ::
(/): mysql-community-server-8.0.-.el7.x86_64.rpm                                                                                            |  MB  ::
------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                   8.7 MB/s |  MB  ::
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Importing GPG key 0x5072E1F5:
 Userid     : "MySQL Release Engineering <mysql-build@oss.oracle.com>"
 Fingerprint: a4a9  76fc bd3c  70c8 8c71 8d3b  e1f5
 Package    : mysql80-community-release-el7-.noarch (installed)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
  Installing : mysql-community-common-8.0.-.el7.x86_64                                                                                                           /
  Installing : mysql-community-libs-8.0.-.el7.x86_64                                                                                                             /
  Installing : mysql-community-client-8.0.-.el7.x86_64                                                                                                           /
  Installing : mysql-community-libs-compat-8.0.-.el7.x86_64                                                                                                      /
  Installing : numactl-libs-2.0.-.el7.x86_64                                                                                                                      /
  Installing : mysql-community-server-8.0.-.el7.x86_64                                                                                                           /
  Updating   : :postfix-2.10.-.el7.x86_64                                                                                                                        /
  Cleanup    : :postfix-2.10.-.el7.x86_64                                                                                                                        /
  Erasing    : :mariadb-libs-5.5.-.el7.x86_64                                                                                                                   /
warning: file /usr/share/mysql/ukrainian/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/ukrainian: remove failed: No such file or directory
warning: file /usr/share/mysql/swedish/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/swedish: remove failed: No such file or directory
warning: file /usr/share/mysql/spanish/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/spanish: remove failed: No such file or directory
warning: file /usr/share/mysql/slovak/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/slovak: remove failed: No such file or directory
warning: file /usr/share/mysql/serbian/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/serbian: remove failed: No such file or directory
warning: file /usr/share/mysql/russian/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/russian: remove failed: No such file or directory
warning: file /usr/share/mysql/romanian/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/romanian: remove failed: No such file or directory
warning: file /usr/share/mysql/portuguese/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/portuguese: remove failed: No such file or directory
warning: file /usr/share/mysql/polish/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/polish: remove failed: No such file or directory
warning: file /usr/share/mysql/norwegian/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/norwegian-ny/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/norwegian-ny: remove failed: No such file or directory
warning: file /usr/share/mysql/norwegian: remove failed: No such file or directory
warning: file /usr/share/mysql/korean/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/korean: remove failed: No such file or directory
warning: file /usr/share/mysql/japanese/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/japanese: remove failed: No such file or directory
warning: file /usr/share/mysql/italian/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/italian: remove failed: No such file or directory
warning: file /usr/share/mysql/hungarian/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/hungarian: remove failed: No such file or directory
warning: file /usr/share/mysql/greek/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/greek: remove failed: No such file or directory
warning: file /usr/share/mysql/german/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/german: remove failed: No such file or directory
warning: file /usr/share/mysql/french/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/french: remove failed: No such file or directory
warning: file /usr/share/mysql/estonian/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/estonian: remove failed: No such file or directory
warning: file /usr/share/mysql/english/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/english: remove failed: No such file or directory
warning: file /usr/share/mysql/dutch/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/dutch: remove failed: No such file or directory
warning: file /usr/share/mysql/danish/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/danish: remove failed: No such file or directory
warning: file /usr/share/mysql/czech/errmsg.sys: remove failed: No such file or directory
warning: file /usr/share/mysql/czech: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/swe7.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/macroman.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/macce.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/latin7.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/latin5.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/latin2.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/latin1.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/koi8u.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/koi8r.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/keybcs2.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/hp8.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/hebrew.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/greek.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/geostd8.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/dec8.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/cp866.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/cp852.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/cp850.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/cp1257.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/cp1256.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/cp1251.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/cp1250.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/ascii.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/armscii8.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/README: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets/Index.xml: remove failed: No such file or directory
warning: file /usr/share/mysql/charsets: remove failed: No such file or directory
warning: file /usr/share/mysql: remove failed: No such file or directory
warning: file /usr/lib64/mysql/plugin/mysql_clear_password.so: remove failed: No such file or directory
warning: file /usr/lib64/mysql/plugin/dialog.so: remove failed: No such file or directory
warning: file /usr/lib64/mysql/libmysqlclient.so.18.0.: remove failed: No such file or directory
  Verifying  : numactl-libs-2.0.-.el7.x86_64                                                                                                                      /
  Verifying  : mysql-community-client-8.0.-.el7.x86_64                                                                                                           /
  Verifying  : mysql-community-libs-compat-8.0.-.el7.x86_64                                                                                                      /
  Verifying  : :postfix-2.10.-.el7.x86_64                                                                                                                        /
  Verifying  : mysql-community-libs-8.0.-.el7.x86_64                                                                                                             /
  Verifying  : mysql-community-server-8.0.-.el7.x86_64                                                                                                           /
  Verifying  : mysql-community-common-8.0.-.el7.x86_64                                                                                                           /
  Verifying  : :mariadb-libs-5.5.-.el7.x86_64                                                                                                                   /
  Verifying  : :postfix-2.10.-.el7.x86_64                                                                                                                        / 

Installed:
  mysql-community-libs.x86_64 :8.0.-.el7          mysql-community-libs-compat.x86_64 :8.0.-.el7          mysql-community-server.x86_64 :8.0.-.el7         

Dependency Installed:
  mysql-community-client.x86_64 :8.0.-.el7               mysql-community-common.x86_64 :8.0.-.el7               numactl-libs.x86_64 :2.0.-.el7              

Dependency Updated:
  postfix.x86_64 :2.10.-.el7                                                                                                                                         

Replaced:
  mariadb-libs.x86_64 :5.5.-.el7                                                                                                                                    

Complete!

　　上面的安装过程有点长，可以看到它默认给我们安装了最新版本的mysql8，当然你也可以自己指定版本。另外它在安装时会去删掉原有的卸载残留，不过因为我们已经提前删掉了，所以会出现那一堆warnning提示删除卸载残留文件时没找到文件。

4、启动mysql

# service mysqld start
Redirecting to /bin/systemctl start mysqld.service
# service mysqld status
Redirecting to /bin/systemctl status mysqld.service
鈼[0m mysqld.service - MySQL Server
   Loaded: loaded (/usr/lib/systemd/system/mysqld.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat -- :: CST; 15s ago
     Docs: man:mysqld()
           http://dev.mysql.com/doc/refman/en/using-systemd.html
  Process:  ExecStartPre=/usr/bin/mysqld_pre_systemd (code=exited, status=/SUCCESS)
 Main PID:  (mysqld)
   Status: "SERVER_OPERATING"
   CGroup: /system.slice/mysqld.service
           鈹斺攢11772 /usr/sbin/mysqld

May  :: VM_0_17_centos systemd[]: Starting MySQL Server...
May  :: VM_0_17_centos systemd[]: Started MySQL Server.

5、找初始密码

# grep 'temporary password' /var/log/mysqld.log
--03T23::.160286Z  [Note] [MY-] [Server] A temporary password is generated for root@localhost: c-uo(;XAc2FD

　　这里的c-uo(;XAc2FD就是我的初始密码，复制它去登陆mysql。

6、登陆并修改密码

# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is
Server version: 8.0.

Copyright (c) , , 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> ALTER USER 'root'@'localhost' IDENTIFIED BY 'Root123@';
Query OK,  rows affected (0.03 sec)

　　这里说下密码规则：8位以上，大小写字母、数字和特殊字母。

7、创建个新库来用：

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| sys                |
+--------------------+
 rows in set (0.00 sec)

mysql> create database test;
Query OK,  row affected (0.03 sec)

mysql> use test;
Database changed
mysql> show tables;
Empty set (0.00 sec)

8、重启mysql，使用新密码登陆，开始接入应用

# service mysqld restart
Redirecting to /bin/systemctl restart mysqld.service

　　这里我是给安装mysql的机器自己用的，所以没有开发端口给远程。需要本地远程机器的话还得再设置一下，这里就不展开了。