报错信息：
... 错误：软件包：mysql-community-server-5.7.30-1.el7.x86_64 (mysql57-community) 需要：mysql-community-common(x86-64) = 5.7.30-1.el7 已安装: mysql-community-common-8.0.20-1.el7.x86_64 (@mysql80-community) ...
安装过程：
[root@test2 ~]# wget https://repo.mysql.com//mysql57-community-release-el7-11.noarch.rpm //安装Mysql Yum源 [root@test2 ~]# ls mysql57-community-release-el7-11.noarch.rpm mysql57-community-release-el7-11.noarch.rpm [root@test2 ~]# rpm -ivh mysql57-community-release-el7-11.noarch.rpm 准备中... ################################# [100%] 正在升级/安装... 1:mysql57-community-release-el7-11 ################################# [100%] [root@test2 ~]# ls /etc/yum.repos.d/mysql-* //安装Mysql Yum源软件包后会有两个Yum源配置文件 /etc/yum.repos.d/mysql-community.repo /etc/yum.repos.d/mysql-community-source.repo [root@test2 ~]# vim /etc/yum.repos.d/mysql-community.repo //查看Mysql Yum源配置文件 [mysql-connectors-community] name=MySQL Connectors Community baseurl=http://repo.mysql.com/yum/mysql-connectors-community/el/7/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql [mysql-tools-community] name=MySQL Tools Community baseurl=http://repo.mysql.com/yum/mysql-tools-community/el/7/$basearch/ enabled=1 gpgcheck=1 gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-mysql # Enable to use MySQL 5.5 [mysql55-community] ...（以下配置包括mysql-community-source.repo配置文件中enabled=0，都不启用） [root@test2 ~]# yum -y install mysql-server ... --> 解决依赖关系完成 错误：软件包：mysql-community-server-5.7.30-1.el7.x86_64 (mysql57-community) 需要：mysql-community-common(x86-64) = 5.7.30-1.el7 已安装: mysql-community-common-8.0.20-1.el7.x86_64 (@mysql80-community) mysql-community-common(x86-64) = 8.0.20-1.el7 可用: mysql-community-common-5.7.9-1.el7.x86_64 (mysql57-community) mysql-community-common(x86-64) = 5.7.9-1.el7 可用: mysql-community-common-5.7.10-1.el7.x86_64 (mysql57-community) mysql-community-common(x86-64) = 5.7.10-1.el7 可用: mysql-community-common-5.7.11-1.el7.x86_64 (mysql57-community) mysql-community-common(x86-64) = 5.7.11-1.el7 ...
解决方法：
[root@test2 ~]# yum list installed //查看现在安装了哪些软件 ...... mesa-libGL.x86_64 18.3.4-6.el7_7 @updates mesa-libgbm.x86_64 18.3.4-6.el7_7 @updates mesa-libglapi.x86_64 18.3.4-6.el7_7 @updates microcode_ctl.x86_64 2:2.1-29.el7 @anaconda mozjs17.x86_64 17.0.0-20.el7 @anaconda mpfr.x86_64 3.1.1-4.el7 @base -mysql-community-common.x86_64 8.0.20-1.el7 @mysql80-community -mysql-community-libs.x86_64 8.0.20-1.el7 @mysql80-community mysql-community-libs-compat.x86_64 5.7.29-1.el7 @mysql57-community mysql57-community-release.noarch el7-11 installed ncurses.x86_64 5.9-14.20130511.el7_4 @anaconda ...... //可以在上面安装记录中看到已经安装了mysql8.0的相关软件包，需要卸载 [root@test2 ~]# yum remove mysql-community-common.x86_64 ... Running transaction 正在删除 : 2:postfix-2.10.1-7.el7.x86_64 1/6 正在删除 : percona-xtrabackup-24-2.4.20-1.el7.x86_64 2/6 正在删除 : perl-DBD-MySQL-4.023-6.el7.x86_64 3/6 正在删除 : mysql-community-libs-compat-5.7.29-1.el7.x86_64 4/6 正在删除 : mysql-community-libs-8.0.20-1.el7.x86_64 5/6 正在删除 : mysql-community-common-8.0.20-1.el7.x86_64 ... 删除: mysql-community-common.x86_64 0:8.0.20-1.el7 作为依赖被删除: mysql-community-libs.x86_64 0:8.0.20-1.el7 mysql-community-libs-compat.x86_64 0:5.7.29-1.el7 percona-xtrabackup-24.x86_64 0:2.4.20-1.el7 perl-DBD-MySQL.x86_64 0:4.023-6.el7 postfix.x86_64 2:2.10.1-7.el7 完毕！ [root@test2 ~]# yum -y install mysql-server //重新安装Mysql5.7 ... 已安装: mysql-community-server.x86_64 0:5.7.30-1.el7 作为依赖被安装: mysql-community-client.x86_64 0:5.7.30-1.el7 mysql-community-common.x86_64 0:5.7.30-1.el7 mysql-community-libs.x86_64 0:5.7.30-1.el7 完毕！ [root@test2 ~]# systemctl start mysqld [root@test2 ~]# systemctl enable mysqld [root@test2 ~]# ss -antulpo | grep :3306 tcp LISTEN 0 80 :::3306 :::* users:(("mysqld",pid=2003,fd=21))
报错解决，可以看到现在Myslq 5.7服务已经成功安装并且启动。
