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    Server Migration Center:What do I do if I receive the "A YUM/DNF repository defined multiple times" error message?

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    Server Migration Center:What do I do if I receive the "A YUM/DNF repository defined multiple times" error message?

    Last Updated:Mar 06, 2024

    This topic describes the cause of the error involved in the "A YUM/DNF repository defined multiple times" error message that is reported when you use Server Migration Center (SMC) to migrate an operating system. This topic also describes how to resolve the error.

    Problem description

    During an operating system migration job, the "A YUM/DNF repository defined multiple times" error message is reported.

    Cause

    The configuration files of YUM repositories contain duplicate repository identifiers. This may cause operating system migration jobs to fail.

    Solution

    1. Connect to the Elastic Compute Service (ECS) instance whose operating system you want to migrate. For more information, see Connect to a Linux instance by using a password or key.

    2. Run the following commands to view the repository identifiers in the configuration files of YUM repositories: 

      grep "\[base\]" /etc/yum.repos.d/*.repo
grep "\[extras\]" /etc/yum.repos.d/*.repo
grep "\[updates\]" /etc/yum.repos.d/*.repo

      The following information provides an example of the response. In this example, the repositories defined in the /etc/yum.repos.d/CentOS-7.repo and /etc/yum.repos.d/CentOS-Base.repo files have the same identifier [base]. 

      [root@test ~]# grep "\[base\]" /etc/yum.repos.d/*.repo 
/etc/yum.repos.d/CentOS-7.repo:[base]
/etc/yum.repos.d/CentOS-Base.repo:[base]
[root@test ~]# grep "\[extras\]" /etc/yum.repos.d/*.repo 
/etc/yum.repos.d/CentOS-Base.repo:[extras]
[root@test ~]# grep "\[updates\]" /etc/yum.repos.d/*.repo 
/etc/yum.repos.d/CentOS-Base.repo:[updates]

    3. Modify the duplicate identifiers in the .repo configuration files in the /etc/yum.repo.d/ directory. Make sure that each repository has a unique identifier.

      In this example, you can change the identifier [base] in the /etc/yum.repos.d/CentOS-7.repo or /etc/yum.repos.d/CentOS-Base.repo file to another name. In actual situations, if other identifiers such as [extras] and [updates] are also configured for more than one repository, you must modify the duplicate identifiers to ensure that each repository has a unique identifier.

    4. Retry the operating system migration job. For more information, see Migrate a Linux operating system.