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Sharing single EBS instance between several TeamCity servers

As mentioned above, TeamCity tags every instance it launches with "teamcity:TeamcityData" tag that represents server, cloud profile and source (AMI or EBS-instance). So, in case when several TeamCity servers tries to use the same EBS instance, the second one will see message "Instance is used by another TeamCity server. Unable to start/stop it". If you are sure that no other TeamCity servers are working with this instance, you can delete the "teamcity:TeamcityData" tag and the instance will become available for all TeamCity servers again.