We have a machine for development, running more than 100 NodeJS containers, all connected to a same docker network, interconnected by container names.

Recently, we encountered a strange problem: when the containers communicate with one another, they might sometimes report errors like getaddrinfo EAI_AGAIN, which means DNS query failed.

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I have a MySQL server deployed in a Docker container for testing purposes.

Recently, I found that the server started extremely slowly in the container.

After investigation, it turned out that the problem was caused by the too large open-file limits…

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