开启 VPN 的测试容器：无法连接到本地主机的 Ryuk：49198

Question

I'm using Testcontainer on Unit and Integration test in a Java/maven project. Tests are working as expected, until I run the VPN I'm using to work. With the VPN, I can see the error message "Can not connect to Ryuk at localhost:49198"

Here are the complete logs:

Connected to the target VM, address: '127.0.0.1:50813', transport: 'socket'
2022-10-03 18:01:49.728  INFO   --- [           main] o.t.d.DockerClientProviderStrategy       : Loaded org.testcontainers.dockerclient.UnixSocketClientProviderStrategy from ~/.testcontainers.properties, will try it first
2022-10-03 18:01:50.280  INFO   --- [           main] o.t.d.DockerClientProviderStrategy       : Found Docker environment with local Unix socket (unix:///var/run/docker.sock)
2022-10-03 18:01:50.282  INFO   --- [           main] org.testcontainers.DockerClientFactory   : Docker host IP address is localhost
2022-10-03 18:01:50.308  INFO   --- [           main] org.testcontainers.DockerClientFactory   : Connected to docker: 
  Server Version: 20.10.16
  API Version: 1.41
  Operating System: Ubuntu 20.04.3 LTS
  Total Memory: 15716 MB
2022-10-03 18:01:50.311  INFO   --- [           main] o.t.utility.ImageNameSubstitutor         : Image name substitution will be performed by: DefaultImageNameSubstitutor (composite of 'ConfigurationFileImageNameSubstitutor' and 'PrefixingImageNameSubstitutor')
2022-10-03 18:01:50.926  WARN   --- [containers-ryuk] o.testcontainers.utility.ResourceReaper  : Can not connect to Ryuk at localhost:49198

java.net.SocketException: Connection reset
    at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:323)
    at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:350)
    at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:803)
    at java.base/java.net.Socket$SocketInputStream.read(Socket.java:966)
    at java.base/sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:270)
    at java.base/sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:313)
    at java.base/sun.nio.cs.StreamDecoder.read(StreamDecoder.java:188)
    at java.base/java.io.InputStreamReader.read(InputStreamReader.java:177)
    at java.base/java.io.BufferedReader.fill(BufferedReader.java:162)
    at java.base/java.io.BufferedReader.readLine(BufferedReader.java:329)
    at java.base/java.io.BufferedReader.readLine(BufferedReader.java:396)
    at org.testcontainers.utility.ResourceReaper$FilterRegistry.waitForAcknowledgment(ResourceReaper.java:489)
    at org.testcontainers.utility.ResourceReaper$FilterRegistry.register(ResourceReaper.java:485)
    at org.testcontainers.utility.ResourceReaper.lambda$null$1(ResourceReaper.java:203)
    at org.rnorth.ducttape.ratelimits.RateLimiter.doWhenReady(RateLimiter.java:27)
    at org.testcontainers.utility.ResourceReaper.lambda$start$2(ResourceReaper.java:185)
    at java.base/java.lang.Thread.run(Thread.java:833)

I tried multiple things like setting TESTCONTAINERS_HOST_OVERRIDE to localhost but it didn't work. (I'm not sure if it was taken into account, where should I set this variable?)

I inspected the docker container of testcontainers, with or without VPN and I don't see any difference.

Any idea? Thanks

Answer 1

Problem solved: The VPN was using the same IP range as Docker, which implied collisions. I solved by changing Docker's base IP range by creating a /etc/docker/daemon.json file with another range in it and restarting docker (you can check here: https://medium.com/codebrace/understanding-docker.networks-and-resolving-conflict-with-docker-su.net-ip-range-bfaad092a7ea )