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AWS ALB could not connect to Docker instances for minutes


(Oscardiedrichs) #1

Ok our setup is this AWS ALB -> 2x EC2 Dockerized nodes -> Nginx -> services.

For a brief period <5 minutes, the ALB could not contact the any services running on any of the nodes.
Resulting in 504 from the aws/elb2.0 (ALB)
No restart or redeploy was done. Then it magically came to life a few minutes later.

At the same time I could connect via the nodes io addresses.