Error – Cannot find a valid baseurl for repo: base - Fix it Now ?








Error – Cannot find a valid baseurl for repo: base makes it impossible to update OP5 Monitor to the latest (EL6) version. This becomes a problem when you want to migrate your installation to EL7 since our recommendation is to update to the latest version on the old server before backing up.

Basically, we come across this error when we try to interact with yum, use EasyApache or run updates.

This error indicates that YUM is not capable of accessing the base repository that it uses to find package information. In most cases, there are two possible causes of the error: 1) network issues and/or 2) base URL being commented out in the repository configuration file.

Here at Ibmi Media, as part of our Server Management Services, we regularly help our Customers to perform related CloudLinux queries.


Nature of Error – Cannot find a valid baseurl for repo: base

Recently, our customers informed us that they came across the below error while trying to interact with yum, use EasyApache, or run updates:

Cannot find a valid baseurl for repo: base

This issue is caused by the following reasons:

1. The base, epel, extras, and updates repositories come default on CentOS 6 systems. However, we don't use it on CloudLinux systems. Accidentally reactivation can cause issues.

2. The error indicates, YUM is incapable of accessing the base repository that it uses to find package information.


In most cases, there are two possible causes of the error:

i. Network issues

ii. Base URL being commented out in the repository configuration file.


How to fix Error – Cannot find a valid baseurl for repo: base ?

1. We disable these repositories to ensure that the system continues to function properly:

# yum-config-manager –disable base
# yum-config-manager –disable epel
# yum-config-manager –disable extras
# yum-config-manager –disable updates

2. a. Firstly, we ensure the system is connected to the Internet.

For example, google.com.

# ping google.com

The ping result will indicate either a DNS problem or no Internet connectivity.

Here, we edit network interface configuration files. We can find the network interface, via the IP command.

To edit the configuration for interface enp0s8, open the file /etc/sysconfig/network-scripts/ifcfg-enp0s8.

# vi /etc/sysconfig/network-scripts/ifcfg-enp0s8

If it is a DNS problem, we add the Nameservers in the configuration file:

DNS1=10.0.2.2
DNS2=8.8.8.8

Then we restart the Network Manager service with the systemctl command:

# systemctl restart NetworkManager

Once done, we run a ping once more:

# ping google.com

Eventually, run the yum update or any yum command that gave us the above error.


2. b. Suppose, the connection and DNS are working fine. Then the issue will be with the repo configuration file /etc/yum.repos.d/CentOS-Base.repo.

Firstly, we open the file using any command-line editor.

# vi /etc/yum.repos.d/CentOS-Base.repo

In the [base] section, we uncomment the baseurl by removing the leading # on the baseurl line.

Then we save the changes and close the file.

Finally, we run the yum command again:

# yum update


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Conclusion

This article covers methods to resolve Error – Cannot find a valid baseurl for repo: base. 

To get rid of these error messages and make it possible to update OP5 Monitor you need to change your Centos Base repos in /etc/yum.repos.d/CentOS-Base.repo as follows:

#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=os&infra=$infra
baseurl=http://vault.centos.org/centos/$releasever/os/$basearch/

Comment out all mirrorlist lines, remove the comment from baseurl and change it to "vault.centos.org". 

This way yum will stop complaining and you will be able to use the OP5 repos.


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