版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/u010871004/article/details/82024479
首先，需要查看下系统中是否安装了MySQL
rpm -qa | grep mysql对于新安装的系统通常都是没有安装mysql的，除了在安装系统的时候，勾选了mysql的选项，进行的安装。但是在CentOS7中，mysql默认安装的是Mariadb，这个数据库不是我们所需要的，所以应该卸载这个数据库。
使用命令rpm -e包名，包名可以包含版本号等信息，但是不可以有后缀.rpm。
然后我们需要通过wget来获取mysql的repo源
wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm下载好的文件，在当前的执行目录下面，在当前的目录下面执行
sudo rpm -ivh mysql-community-release-el7-5.noarch.rpm看到如下的信息，说明安装成功
Preparing... ################################# [100%]
Updating / installing...
1:mysql-community-release-el7-5 ################################# [100%]
[jiang@localhost ~]$ yum -qa | grep mysql
Command line error: no such option: -a
[jiang@localhost ~]$ rpm -qa | grep mysql
mysql-community-release-el7-5.noarch
[jiang@localhost ~]$ sudo yum install mysql-server
Loaded plugins: fastestmirror
mysql-connectors-community | 2.5 kB 00:00:00
mysql-tools-community | 2.5 kB 00:00:00
mysql56-community | 2.5 kB 00:00:00
(1/3): mysql-tools-community/x86_64/primary_db | 45 kB 00:00:00
(2/3): mysql-connectors-community/x86_64/primary_db | 25 kB 00:00:00
(3/3): mysql56-community/x86_64/primary_db | 197 kB 00:00:02
Loading mirror speeds from cached hostfile
* base: mirrors.aliyun.com
* extras: mirrors.aliyun.com
* updates: mirrors.aliyun.com
Resolving Dependencies
--> Running transaction check
---> Package mysql-community-server.x86_64 0:5.6.41-2.el7 will be installed
--> Processing Dependency: mysql-community-common(x86-64) = 5.6.41-2.el7 for package: mysql-community-server-5.6.41-2.el7.x86_64
--> Processing Dependency: mysql-community-client(x86-64) >= 5.6.10 for package: mysql-community-server-5.6.41-2.el7.x86_64
--> Processing Dependency: perl(Data::Dumper) for package: mysql-community-server-5.6.41-2.el7.x86_64
--> Processing Dependency: perl(DBI) for package: mysql-community-server-5.6.41-2.el7.x86_64
--> Running transaction check
---> Package mysql-community-client.x86_64 0:5.6.41-2.el7 will be installed
--> Processing Dependency: mysql-community-libs(x86-64) >= 5.6.10 for package: mysql-community-client-5.6.41-2.el7.x86_64
---> Package mysql-community-common.x86_64 0:5.6.41-2.el7 will be installed
---> Package perl-DBI.x86_64 0:1.627-4.el7 will be installed
--> Processing Dependency: perl(RPC::PlServer) >= 0.2001 for package: perl-DBI-1.627-4.el7.x86_64
--> Processing Dependency: perl(RPC::PlClient) >= 0.2000 for package: perl-DBI-1.627-4.el7.x86_64
---> Package perl-Data-Dumper.x86_64 0:2.145-3.el7 will be installed
--> Running transaction check
---> Package mariadb-libs.x86_64 1:5.5.56-2.el7 will be obsoleted
---> Package mysql-community-libs.x86_64 0:5.6.41-2.el7 will be obsoleting
---> Package perl-PlRPC.noarch 0:0.2020-14.el7 will be installed
--> Processing Dependency: perl(Net::Daemon) >= 0.13 for package: perl-PlRPC-0.2020-14.el7.noarch
--> Processing Dependency: perl(Net::Daemon::Test) for package: perl-PlRPC-0.2020-14.el7.noarch
--> Processing Dependency: perl(Net::Daemon::Log) for package: perl-PlRPC-0.2020-14.el7.noarch
--> Processing Dependency: perl(Compress::Zlib) for package: perl-PlRPC-0.2020-14.el7.noarch
--> Running transaction check
---> Package perl-IO-Compress.noarch 0:2.061-2.el7 will be installed
--> Processing Dependency: perl(Compress::Raw::Zlib) >= 2.061 for package: perl-IO-Compress-2.061-2.el7.noarch
--> Processing Dependency: perl(Compress::Raw::Bzip2) >= 2.061 for package: perl-IO-Compress-2.061-2.el7.noarch
---> Package perl-Net-Daemon.noarch 0:0.48-5.el7 will be installed
--> Running transaction check
---> Package perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7 will be installed
---> Package perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
=======================================================================================================================================================================
Package Arch Version Repository Size
=======================================================================================================================================================================
Installing:
mysql-community-libs x86_64 5.6.41-2.el7 mysql56-community 2.0 M
replacing mariadb-libs.x86_64 1:5.5.56-2.el7
mysql-community-server x86_64 5.6.41-2.el7 mysql56-community 59 M
Installing for dependencies:
mysql-community-client x86_64 5.6.41-2.el7 mysql56-community 19 M
mysql-community-common x86_64 5.6.41-2.el7 mysql56-community 257 k
perl-Compress-Raw-Bzip2 x86_64 2.061-3.el7 base 32 k
perl-Compress-Raw-Zlib x86_64 1:2.061-4.el7 base 57 k
perl-DBI x86_64 1.627-4.el7 base 802 k
perl-Data-Dumper x86_64 2.145-3.el7 base 47 k
perl-IO-Compress noarch 2.061-2.el7 base 260 k
perl-Net-Daemon noarch 0.48-5.el7 base 51 k
perl-PlRPC noarch 0.2020-14.el7 base 36 k
Transaction Summary
=======================================================================================================================================================================
Install 2 Packages (+9 Dependent packages)
Total download size: 82 M
Is this ok [y/d/N]: y
Downloading packages:
warning: /var/cache/yum/x86_64/7/mysql56-community/packages/mysql-community-common-5.6.41-2.el7.x86_64.rpm: Header V3 DSA/SHA1 Signature, key ID 5072e1f5: NOKEY32 ETA
Public key for mysql-community-common-5.6.41-2.el7.x86_64.rpm is not installed
(1/11): mysql-community-common-5.6.41-2.el7.x86_64.rpm | 257 kB 00:00:01
(2/11): mysql-community-libs-5.6.41-2.el7.x86_64.rpm | 2.0 MB 00:00:15
perl-DBI-1.627-4.el7.x86_64.rp FAILED ] 434 kB/s | 6.6 MB 00:02:58 ETA
http://mirrors.cloud.aliyuncs.com/centos/7/os/x86_64/Packages/perl-DBI-1.627-4.el7.x86_64.rpm: [Errno 14] curl#6 - "Could not resolve host: mirrors.cloud.aliyuncs.com; Name or service not known"
Trying other mirror.
(3/11): perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64.rpm | 32 kB 00:00:00
(4/11): perl-IO-Compress-2.061-2.el7.noarch.rpm | 260 kB 00:00:00
(5/11): perl-Net-Daemon-0.48-5.el7.noarch.rpm | 51 kB 00:00:00
(6/11): perl-PlRPC-0.2020-14.el7.noarch.rpm | 36 kB 00:00:00
(7/11): perl-Data-Dumper-2.145-3.el7.x86_64.rpm | 47 kB 00:00:02
(8/11): perl-DBI-1.627-4.el7.x86_64.rpm | 802 kB 00:00:02
perl-Compress-Raw-Zlib-2.061-4 FAILED ===- ] 206 kB/s | 12 MB 00:05:49 ETA
http://mirrors.aliyuncs.com/centos/7/os/x86_64/Packages/perl-Compress-Raw-Zlib-2.061-4.el7.x86_64.rpm: [Errno 14] curl#7 - "Failed connect to mirrors.aliyuncs.com:80; Connection refused"
Trying other mirror.
(9/11): perl-Compress-Raw-Zlib-2.061-4.el7.x86_64.rpm | 57 kB 00:00:00
(10/11): mysql-community-client-5.6.41-2.el7.x86_64.rpm | 19 MB 00:02:04
(11/11): mysql-community-server-5.6.41-2.el7.x86_64.rpm | 59 MB 00:19:17
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 72 kB/s | 82 MB 00:19:35
Retrieving key from file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Importing GPG key 0x5072E1F5:
Userid : "MySQL Release Engineering <[email protected]>"
Fingerprint: a4a9 4068 76fc bd3c 4567 70c8 8c71 8d3b 5072 e1f5
Package : mysql-community-release-el7-5.noarch (installed)
From : file:/etc/pki/rpm-gpg/RPM-GPG-KEY-mysql
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
Installing : mysql-community-common-5.6.41-2.el7.x86_64 1/12
Installing : perl-Data-Dumper-2.145-3.el7.x86_64 2/12
Installing : mysql-community-libs-5.6.41-2.el7.x86_64 3/12
Installing : mysql-community-client-5.6.41-2.el7.x86_64 4/12
Installing : perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64 5/12
Installing : perl-Net-Daemon-0.48-5.el7.noarch 6/12
Installing : 1:perl-Compress-Raw-Zlib-2.061-4.el7.x86_64 7/12
Installing : perl-IO-Compress-2.061-2.el7.noarch 8/12
Installing : perl-PlRPC-0.2020-14.el7.noarch 9/12
Installing : perl-DBI-1.627-4.el7.x86_64 10/12
Installing : mysql-community-server-5.6.41-2.el7.x86_64 11/12
Erasing : 1:mariadb-libs-5.5.56-2.el7.x86_64 12/12
Verifying : mysql-community-server-5.6.41-2.el7.x86_64 1/12
Verifying : mysql-community-client-5.6.41-2.el7.x86_64 2/12
Verifying : mysql-community-libs-5.6.41-2.el7.x86_64 3/12
Verifying : perl-Data-Dumper-2.145-3.el7.x86_64 4/12
Verifying : mysql-community-common-5.6.41-2.el7.x86_64 5/12
Verifying : perl-IO-Compress-2.061-2.el7.noarch 6/12
Verifying : 1:perl-Compress-Raw-Zlib-2.061-4.el7.x86_64 7/12
Verifying : perl-Net-Daemon-0.48-5.el7.noarch 8/12
Verifying : perl-DBI-1.627-4.el7.x86_64 9/12
Verifying : perl-Compress-Raw-Bzip2-2.061-3.el7.x86_64 10/12
Verifying : perl-PlRPC-0.2020-14.el7.noarch 11/12
Verifying : 1:mariadb-libs-5.5.56-2.el7.x86_64 12/12
Installed:
mysql-community-libs.x86_64 0:5.6.41-2.el7 mysql-community-server.x86_64 0:5.6.41-2.el7
Dependency Installed:
mysql-community-client.x86_64 0:5.6.41-2.el7 mysql-community-common.x86_64 0:5.6.41-2.el7 perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7
perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7 perl-DBI.x86_64 0:1.627-4.el7 perl-Data-Dumper.x86_64 0:2.145-3.el7
perl-IO-Compress.noarch 0:2.061-2.el7 perl-Net-Daemon.noarch 0:0.48-5.el7 perl-PlRPC.noarch 0:0.2020-14.el7
Replaced:
mariadb-libs.x86_64 1:5.5.56-2.el7
Complete!然后通过执行
mysql -uroot登录mysql数据库，可能会爆出来这个问题
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)这个是因为当前的用户没有在这个目录下执行的权限，我们给当前用户给个权限
sudo chown -R jiang:jiang /var/lib/mysql服务器重启
sudo systemctl restart mysql.service如果需要远程登录的话，我们还需要防火前开了3306的端口号
sudo firewall-cmd --zone=public --add-port=3306/tcp --permanent执行完后，需要重新加载防火墙
sudo firewall-cmd --reload然后进入数据库中，给root用户，配置个密码
use mysql;
update user set password=password('123456') where user='root';然后，给root用户，赋上远程登录的权限，登录需要用密码123456来识别。
GRANT ALL PRIVILEGES ON *.* TO root@"%" IDENTIFIED BY "123456";最终，mysql数据安装完毕。