You may see docker push failure that results in this error: Received unexpected HTTP status: 504 GATEWAY_TIMEOUT
When this issue happens, use following steps to identify and fix the issue.
- Identify which application generated the error (e.g. AWS ELB, Load balancer, reverse proxy) by checking its logs
- Once the application is identified, increase idle timeout value. For AWS ELB, go to Health Check => Timeout and increase the value (see AWS ELB guide for more details)