redhat 7.2更新yum源时踩的坑

yum

1.检查是否安装yum包

查看RHel是否安装了yum，若是安装了，那么又有哪些yum包：

[[email protected] yum.repos.d]# rpm -qa |grep yum
yum-3.4.3-118.el7.noarch
yum-utils-1.1.31-24.el7.noarch
yum-rhn-plugin-2.0.1-4.el7.noarch
PackageKit-yum-0.8.9-11.el7.x86_64
yum-langpacks-0.4.2-3.el7.noarch
yum-Metadata-parser-1.1.4-10.el7.x86_64

2 删除redhat自带的yum包

卸载上面显示的所有yum包：

[[email protected] ~]# rpm -qa|grep yum|xargs rpm -e --nodeps（不检查依赖，直接删除rpm包）

再用

[[email protected] ~]# rpm -qa |grep yum

[[email protected] ~]#

查看，无信息显示表示已经卸载完成。

3.安装yum
rpm -ivh yum-* --nodeps
rpm -Uvh rpm-4.11.3-35.el7.x86_64.rpm --nodeps
rpm -Uvh python-urlgrabber-3.10-9.el7.noarch.rpm --nodeps

4.vim /etc/yum.repos.d/CentOs-Base.repo

内容：

#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-$7 - Base - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=os
baseurl=http://mirrors.163.com/centos/7/os/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

#released updates
[updates]
name=CentOS-$7 - updates - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=updates
baseurl=http://mirrors.163.com/centos/7/updates/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that may be useful
[extras]
name=CentOS-$7 - Extras - 163.com
#mirrorlist=http://mirrorlist.centos.org/?release=$7&arch=$basearch&repo=extras
baseurl=http://mirrors.163.com/centos/7/extras/$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

#additional packages that extend functionality of exisTing packages
[centosplus]
name=CentOS-$7 - Plus - 163.com
baseurl=http://mirrors.163.com/centos/7/centosplus/$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos/RPM-GPG-KEY-CentOS-7

5.清除yum缓存
yum clean all
yum makecache
yum update -y

6.安装必要软件
yum install vim net-tools sshd ntp wget lrzsz -y

7.调整时间sudo systemctl enable ntpdsudo systemctl start ntpddate 查看时间netdate asia.pool.ntp.org 调整时间