What to do when you are upgrading your IceWarp Server to CentOS 7, which is no longer supported by the vendor and IceWarp.
If you are still running CentOS 7 and need to migrate your OS to a newer version, please note that you should consider this a top priority and focus on migration as soon as possible.
Upgrading your IceWarp Server running on CentOS 7 will result in an error during the installation, which refers to missing repositories that are no longer available from the vendor.
You can add them manually to complete the upgrade. However, this step should be only temporary, and you should migrate your OS as soon as possible.
How to add missing repositories
sed -i 's/#baseurl=http:\/\/mirror/baseurl=http:\/\/vault/g' /etc/yum.repos.d/CentOS-Base.repo
CentOS has moved the repositories from mirror to vault.
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