在MySQL官网下载安装包
[root@hashow-db-master resource]# tar -xvf mysql-5.7.22-1.el7.x86_64.rpm-bundle.tar
[root@hashow-db-master resource]# ls
DATALOSS_WARNING_README.txt                     mysql-community-common-5.7.22-1.el7.x86_64.rpm           mysql-community-libs-compat-5.7.22-1.el7.x86_64.rpm
lost+found                                      mysql-community-devel-5.7.22-1.el7.x86_64.rpm            mysql-community-minimal-debuginfo-5.7.22-1.el7.x86_64.rpm
lrzsz-0.12.20                                   mysql-community-embedded-5.7.22-1.el7.x86_64.rpm         mysql-community-server-5.7.22-1.el7.x86_64.rpm
lrzsz-0.12.20.tar.gz                            mysql-community-embedded-compat-5.7.22-1.el7.x86_64.rpm  mysql-community-server-minimal-5.7.22-1.el7.x86_64.rpm
mysql-5.7.22-1.el7.x86_64.rpm-bundle.tar        mysql-community-embedded-devel-5.7.22-1.el7.x86_64.rpm   mysql-community-test-5.7.22-1.el7.x86_64.rpm
mysql-community-client-5.7.22-1.el7.x86_64.rpm  mysql-community-libs-5.7.22-1.el7.x86_64.rpm             swapfile
[root@hashow-db-master resource]# 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
查看系统版本
[root@hashow-db-master resource]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.3 (Maipo)

在Linux系统中，如果要使用关系型数据库的话，基本都是用的mysql，而且以往7以下版本的centos
系统都是默认的集成有mysql。然而对于现在最新的centos7系统来说，已经不支持mysql数据库，它默认

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内部集成了maridb，如果我们想要使用 mysql 的话，就要先将原来的maridb卸载掉，不然会引起冲突
命令：rpm -qa |grep maridb
[root@hashow-db-master resource]# rpm -e mariadb-libs-5.5.52-1.el7.x86_64
error: Failed dependencies:
        libmysqlclient.so.18()(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64
        libmysqlclient.so.18(libmysqlclient_18)(64bit) is needed by (installed) postfix-2:2.10.1-6.el7.x86_64
卸载提示有依赖的包，强制卸载
[root@hashow-db-master resource]# rpm -e --nodeps mariadb-libs-5.5.52-1.el7.x86_64
开始安装MySQL5.7.22，要按rpm包顺序安装：
[root@hashow-db-master resource]# 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@hashow-db-master resource]# 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@hashow-db-master resource]# 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@hashow-db-master resource]# 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%]

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