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OS的版本
[root@test yum.repos.d]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.0 (Maipo)
[root@test yum.repos.d]#安装zabbix的文档
https://www.zabbix.com/cn/download?zabbix=4.0&os_distribution=oracle&os_version=7&db=MySQL
在安装zabbix的时候，提示发现有两个包没法安装 ，这两个包是bcmatch和mbstring两个包，而且redhat的安装光盘上是没有这两个包的。看了一些文档，，提示注册过redhat操作系统后，会更新这两个包。换一种方法，换centos的源来更新。
先下载CentOS 的源
[root@test yum.repos.d]#wget http://mirrors.163.com/.help/CentOS7-Base-163.repo修改源的内容，主要修改了3个地方
[root@test yum.repos.d]# more CentOS7-Base-163.repo
# CentOS-Base.repo
#
# The mirror system uses the connecting IP address of the client and the
# update status of each mirror to pick mirrors that are updated to and
# geographically close to the client. You should use this for CentOS updates
# unless you are manually picking other mirrors.
#
# If the mirrorlist= does not work for you, as a fall back you can try the
# remarked out baseurl= line instead.
#
#
[base]
name=CentOS-$releasever - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&rep
o=os
#baseurl=http://mirrors.163.com/centos/$releasever/os/$basearch/
baseurl=http://mirrors.163.com/centos/7/os/x86_64/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#released updates
[updates]
name=CentOS-$releasever - Updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&rep
o=updates
#baseurl=http://mirrors.163.com/centos/$releasever/updates/$basearch/
baseurl=http://mirrors.163.com/centos/7/updates/x86_64/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that may be useful
[extras]
name=CentOS-$releasever - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&rep
o=extras
#baseurl=http://mirrors.163.com/centos/$releasever/extras/$basearch/
baseurl=http://mirrors.163.com/centos/7/extras/x86_64/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
#additional packages that extend functionality of existing packages
[centosplus]
name=CentOS-$releasever - Plus - 163.com
baseurl=http://mirrors.163.com/centos/$releasever/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7
[root@test yum.repos.d]#清除和创建YUM缓存
yum clean all
yum makecache 再次安装zabbix，可以了
yum install zabbix-server-mysql zabbix-web-mysql END