Connection refused right after container start #71
Description
There is a problem with migration from Docker Desktop to Colima docker environment.
When the container is just started, it's mapped port is not available immediately.
I'm not quite sure about all what happens underneath (is it an issue of Lima/Colima/jna/docker-java), but let me give my assumption, the demo is provided as well.
We use testcontainers, a popular framework that bootstraps docker containers for test purposes, in our case it's Postgres. We use image postgres:11.6-alpine.
When the container starts, it allows to retrieve mapped port and right after that the connection is set up.
With Docker desktop it works just fine, but with colima the retry-with-interval workaround is required. Default logic was not expecting this, it was just working fine for years.
My assumption is that the logic that retrieves mapped port is not blocked by startup await, while in Docker desktop there is a strong guarantee about it.
I've created a demo project that shows the issue.
If you start with Docker Desktop, you will see log:
...testcontainers initialization without issues...
...
jdbc:postgresql://localhost:55001/test?loggerLevel=OFF
>>>> Successfully first time
If you start the same test with Colima, you will see log:
...testcontainers initialization with many retry failures (bootstraps service Ryuk container first)
...
jdbc:postgresql://localhost:49154/test?loggerLevel=OFF
>>>> First exception: org.postgresql.util.PSQLException: Connection to localhost:49154 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
...sleep here...
>>>> Successfully second time
The mapped port is obtained in internal logic in this line:
String jdbcUrl = container.getJdbcUrl();
Worth to mention, that on Apple M1 this failure is more explicit (probably because it's faster), with Intel I see only testcontainers Ryuk failures (most probably they added this retry policy to cover the described issue), but still there is an obvious problem.
Let me know if I can provide more details or more convenient example (not sure that Java example is good enough for you).