Go-docker: Container creation fails on subsequent attempt

[vibhorej]

I am trying to build multiple container using go-docker.

Following is the call I am making:

        resp, err := cli.ContainerCreate(ctx, &container.Config{
                Image: image,
                Cmd:   []string{"tail", "-f", "/dev/null"},
                Tty:   true,
                Hostname: hostname,
                WorkingDir: "/root/",
        }, nil, nil, hostname)

During first execution, everything works fine and both the containers (say X-mongo & X-redis) are created successfully. But when I make another call to create new containers with different container names (say Y-mongo & Y-Redis), the code execution fails at a certain point for second container (Y-Redis) and I am not able to exercise the logic ahead. Following is the trace that I see:

2019/05/30 09:35:22 Inside CreateDockerContainer
2019/05/30 09:35:22 top12-mongo
2019/05/30 09:35:22 http: panic serving 127.0.0.1:57786: Error response from daemon: Conflict. The container name "/top12-mongo" is already in use by container "1e5d869cbdb13e10c85e216419d0dd7982000a9a2c5f6782b8ec03d5dbb7e577". You have to remove (or rename) that container to be able to reuse that name.
goroutine 9 [running]:
net/http.(*conn).serve.func1(0xc00023f360)
        /usr/local/go/src/net/http/server.go:1769 +0x139
panic(0x745bc0, 0xc000376df0)
        /usr/local/go/src/runtime/panic.go:522 +0x1b5
webserver/dockercontainer.CreateDockerContainer(0x82e4e0, 0xc0000180d8, 0xc0002aaef2, 0x5, 0xc000375600, 0x5, 0xc000375640, 0x0, 0x0, 0x0, ...)
        /home/nsadmin/go/src/webserver/dockercontainer/dockercontainer.go:88 +0x453
main.sethandler(0x82db60, 0xc0003841c0, 0xc0000ddc00)
        /home/nsadmin/go/src/webserver/main.go:253 +0xc71
net/http.HandlerFunc.ServeHTTP(0x7c9dd8, 0x82db60, 0xc0003841c0, 0xc0000ddc00)
        /usr/local/go/src/net/http/server.go:1995 +0x44
webserver/vendor/github.com/gorilla/mux.(*Router).ServeHTTP(0xc0001000c0, 0x82db60, 0xc0003841c0, 0xc0000dda00)
        /home/nsadmin/go/src/webserver/vendor/github.com/gorilla/mux/mux.go:212 +0xe3
net/http.serverHandler.ServeHTTP(0xc00007aea0, 0x82db60, 0xc0003841c0, 0xc0000dda00)
        /usr/local/go/src/net/http/server.go:2774 +0xa8
net/http.(*conn).serve(0xc00023f360, 0x82e4a0, 0xc000272940)
        /usr/local/go/src/net/http/server.go:1878 +0x851
created by net/http.(*Server).Serve
        /usr/local/go/src/net/http/server.go:2884 +0x2f4

Please help me know if I am doing something wrong here or there is a defect.

[cpuguy83]

The container name "/top12-mongo" is already in use by container

Container names must be unique. It looks like you are creating the container with the name from hostname?

[cpuguy83]

Also note I don't think this library is actually maintained.

[vibhorej]

Thanks @cpuguy83 for pitching in. Earlier I also thought the same but that isn't the case. Container name isn't duplicate as the same logic is exercised in first cycle of container creation. There is some other issue occurring.
Thanks for pointing out that no one is maintaining the library. I will try to dig in more on this front in case no one is maintaining this.

[cpuguy83]

The error you are getting is the error from the engine and is almost certainly legit; you seem to be trying to create two containers with the same name.

[vibhorej]

@cpuguy83 - Error was thrown because I my logic was flawed. Sorry for the trouble.
Closing this ticket.