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：

[root@syq 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：

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

再用

[root@localhost ~]# rpm -qa |grep yum

[root@localhost ~]#

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 ntpd

sudo systemctl start ntpd

date 查看时间

netdate asia.pool.ntp.org 调整时间