If you're encountering the "No more mirrors to try" error  yum update on CentOS 6 ELS (Extended Lifecycle Support), it means that yum are unable to find any valid mirrors to download updates from. This can happen if the CentOS 6 ELS repositories are no longer available or if there are issues with the repository configuration.
Here's how you can address this issue:
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Check Repository Availability: - Verify if the CentOS 6 ELS repositories are still accessible. The repositories may have been discontinued, which would prevent yumus from finding any valid mirrors.
 
- Verify if the CentOS 6 ELS repositories are still accessible. The repositories may have been discontinued, which would prevent 
- 
Update Repository URLs: - Open the CentOS repository configuration files in /etc/yum.repos.d/directory and ensure that the repository URLs are correct and up-to-date. You may need to replace them with alternative mirrors or repositories.
 
- Open the CentOS repository configuration files in 
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Disable Repositories: - Temporarily disable the repositories that are causing issues by setting enabled=0in their respective configuration files. This can preventyumthem from attempting to use them.
 
- Temporarily disable the repositories that are causing issues by setting 
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- Clear the yumcache to ensure it fetches the latest repository information:Update yumCache:
 
- Clear the 
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sudo yum clean all
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Update CentOS Base Repository: - Make sure that the CentOS Base repository is enabled and configured correctly. It's a critical repository for receiving updates.
 - Verify if the GPG keys for the repositories are valid. If not, you may need to import or update them.
Update Repository GPG Keys: 
 
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sudo rpm --import https://mirror.centos.org/centos/RPM-GPG-KEY-CentOS-6
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Use Alternative Repositories: - Consider using alternative repositories or mirrors that are known to be reliable and up-to-date.
 
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Check Network Connectivity: - Ensure that your server has a working internet connection and that there are no network issues preventing yumfrom reaching the repositories.
 
- Ensure that your server has a working internet connection and that there are no network issues preventing 
- 
Verify ELS Subscription: - Ensure that your CentOS 6 system has a valid ELS subscription. Without a valid subscription, you may not have access to ELS repositories.
 
- 
Contact CentOS Support: - If the issue persists, consider reaching out to CentOS support or the ELS support team for further assistance.
 
Please be aware that CentOS 6 ELS reached its end-of-life in November 2020, and it's recommended to migrate to a supported CentOS version or a CentOS alternative like CentOS Stream or AlmaLinux. If possible, consider upgrading to CentOS 7 or CentOS 8, or migrating to a different distribution like AlmaLinux that provides long-term support.
 
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