others-How to solve yum update or yum install problem on centos servers?

1. Purpose

In this post, I would demo how to solve below exception or error when doing yum update or yum install xxx:

[root@genuine-post-2 ~]# yum install mosh

you get this result:

perl-Socket6-0.23-4.el6.x86_64: Cannot find a valid baseurl for repo: base
perl-IO-Socket-INET6-2.56-4.el6.noarch: Cannot find a valid baseurl for repo: base

Or you try to use the yum update , you still get the following errors:

  perl-Git-1.7.1-10.el6_10.noarch: Cannot find a valid baseurl for repo: updates
  sudo-1.8.6p3-29.el6_10.3.x86_64: Cannot find a valid baseurl for repo: updates
  curl-7.19.7-54.el6_10.x86_64: Cannot find a valid baseurl for repo: updates
  freetype-2.3.11-19.el6_10.x86_64: Cannot find a valid baseurl for repo: updates

And I have tried to enable the baseurl in the /etc/yum.repos.d/CentOS-Base.repo, but it’s still not working.

2. Environment

• centos 6

3. The solution

From November 30, 2020, the major open source mirror sites of centos6 have been discontinued for maintenance, but Alibaba source can still be used because of the previous version of centos packages in his centos-vault warehouse.

Just execute this command on your server, it would set

sed -i "s|enabled=1|enabled=0|g" /etc/yum/pluginconf.d/fastestmirror.conf
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -o /etc/yum.repos.d/CentOS-Base.repo https://www.xmpan.com/Centos-6-Vault-Aliyun.repo 
yum clean all
yum makecache

Now try again:

[root@genuine-post-2 ~]# yum install mosh

We get this:

Installed:
  mosh.x86_64 0:1.3.2-1.el6

Installed as dependencies:
  perl-IO-Socket-INET6.noarch 0:2.56-4.el6                                   perl-Socket-GetAddrInfo.x86_64 0:0.12-1.el6                                   perl-Socket6.x86_64 0:0.23-4.el6                                   protobuf.x86_64 0:2.3.0-9.el6

Complete！

4. The reason

In fact, we are using the below repo file:

 File: Centos-6-Vault-Aliyun.repo
───────┼───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ # CentOS-Base.repo
   2   │ #
   3   │ # The mirror system uses the connecting IP address of the client and the
   4   │ # update status of each mirror to pick mirrors that are updated to and
   5   │ # geographically close to the client.  You should use this for CentOS updates
   6   │ # unless you are manually picking other mirrors.
   7   │ #
   8   │ # If the mirrorlist= does not work for you, as a fall back you can try the
   9   │ # remarked out baseurl= line instead.
  10   │ #
  11   │ #
  12   │
  13   │ [base]
  14   │ name=CentOS-6.10 - Base - mirrors.aliyun.com
  15   │ failovermethod=priority
  16   │ baseurl=http://mirrors.aliyun.com/centos-vault/6.10/os/$basearch/
  17   │ gpgcheck=1
  18   │ gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6
  19   │
  20   │ #released updates
  21   │ [updates]
  22   │ name=CentOS-6.10 - Updates - mirrors.aliyun.com
  23   │ failovermethod=priority
  24   │ baseurl=http://mirrors.aliyun.com/centos-vault/6.10/updates/$basearch/
  25   │ gpgcheck=1
  26   │ gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6
  27   │
  28   │ #additional packages that may be useful
  29   │ [extras]
  30   │ name=CentOS-6.10 - Extras - mirrors.aliyun.com
  31   │ failovermethod=priority
  32   │ baseurl=http://mirrors.aliyun.com/centos-vault/6.10/extras/$basearch/
  33   │ gpgcheck=1
  34   │ gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6
  35   │
  36   │ #additional packages that extend functionality of existing packages
  37   │ [centosplus]
  38   │ name=CentOS-6.10 - Plus - mirrors.aliyun.com
  39   │ failovermethod=priority
  40   │ baseurl=http://mirrors.aliyun.com/centos-vault/6.10/centosplus/$basearch/
  41   │ gpgcheck=1
  42   │ enabled=0
  43   │ gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6
  44   │
  45   │ #contrib - packages by Centos Users
  46   │ [contrib]
  47   │ name=CentOS-6.10 - Contrib - mirrors.aliyun.com
  48   │ failovermethod=priority
  49   │ baseurl=http://mirrors.aliyun.com/centos-vault/6.10/contrib/$basearch/
  50   │ gpgcheck=1
  51   │ enabled=0
  52   │ gpgkey=http://mirrors.aliyun.com/centos-vault/RPM-GPG-KEY-CentOS-6

It’s using aliyun as the baseurl.

5. Summary

In this post, I demonstrated how to solve the baseurl problem when using yum on CentOS servers .