Connected to server but it's empty??

[k2gremlin]

So I stood up Dockercraft on a Photon OS server and I am able to connect to it with no problem. However, the world is blank. I expected to see at least the container hosting the dockercraft but it is nothing but a blank world.

The only message I am getting in the portainer logs is "tcp client OnError: 111: Connection refused" over and over about 50 times a second or more.

In portainer, I setup the container with port mapping of 25575:25565, volume /var/run/docker.sock:/var/run/docker.sock and tty command -t.

Here is the results of inspecting the container.

[
{
"Id": "1d50c48284408c0158f23ae070dc8f1f1f8bf5064c947d47d427fcd3f9b49322",
"Created": "2017-12-16T23:06:27.553581001Z",
"Path": "/srv/Server/start.sh",
"Args": [],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 8037,
"ExitCode": 0,
"Error": "",
"StartedAt": "2017-12-16T23:06:27.757120107Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:dad8850a800d96ec7f633a8ef98ec9b39ac60b98eeb25c05079f5e63e6418d88",
"ResolvConfPath": "/var/lib/docker/containers/1d50c48284408c0158f23ae070dc8f1f1f8bf5064c947d47d427fcd3f9b49322/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/1d50c48284408c0158f23ae070dc8f1f1f8bf5064c947d47d427fcd3f9b49322/hostname",
"HostsPath": "/var/lib/docker/containers/1d50c48284408c0158f23ae070dc8f1f1f8bf5064c947d47d427fcd3f9b49322/hosts",
"LogPath": "/var/lib/docker/containers/1d50c48284408c0158f23ae070dc8f1f1f8bf5064c947d47d427fcd3f9b49322/1d50c48284408c0158f23ae070dc8f1f1f8bf5064c947d47d427fcd3f9b49322-json.log",
"Name": "/mc",
"RestartCount": 0,
"Driver": "overlay2",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": [
"/var/run/docker.sock:/var/run/docker.sock"
],
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "bridge",
"PortBindings": {
"25565/tcp": [
{
"HostIp": "",
"HostPort": "25575"
}
]
},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Dns": null,
"DnsOptions": null,
"DnsSearch": null,
"ExtraHosts": [],
"GroupAdd": null,
"IpcMode": "",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": null,
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DiskQuota": 0,
"KernelMemory": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": -1,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/577ca66cce3e66d05242bded12a6b28dc73fe4e10a4714ccba21f2d853d570a8-init/diff:/var/lib/docker/overlay2/3787f6b8fabd22ffa287714fe2fb72f402720eb52b1d03e01ce64b849add7c77/diff:/var/lib/docker/overlay2/e2abe38bab171f241b0d8a22323b95cacd98100483ad54bd4b2f8a2817377080/diff:/var/lib/docker/overlay2/3a2c3a4cdf9c0e558941a1310e6aa2ef6d1d001e221da1b95118966f904d8a09/diff:/var/lib/docker/overlay2/5fdad9f1883c13f70a79b712e1845946a6e04d290450180682ef7911b58b18c5/diff:/var/lib/docker/overlay2/0c8320dc2e616060e58616df2c2316e7fdfd5634f3c12f125e89aa155d0cfe23/diff:/var/lib/docker/overlay2/17b0f491af64911cd021dd969099d0c9072a188fe992bc9c9b2480069c497562/diff:/var/lib/docker/overlay2/9622e55000efa3098b7694ad95ccc5b784fb4a02a42436aceeb9332ca9577fcb/diff",
"MergedDir": "/var/lib/docker/overlay2/577ca66cce3e66d05242bded12a6b28dc73fe4e10a4714ccba21f2d853d570a8/merged",
"UpperDir": "/var/lib/docker/overlay2/577ca66cce3e66d05242bded12a6b28dc73fe4e10a4714ccba21f2d853d570a8/diff",
"WorkDir": "/var/lib/docker/overlay2/577ca66cce3e66d05242bded12a6b28dc73fe4e10a4714ccba21f2d853d570a8/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "bind",
"Source": "/var/run/docker.sock",
"Destination": "/var/run/docker.sock",
"Mode": "",
"RW": true,
"Propagation": "rprivate"
}
],
"Config": {
"Hostname": "5332b660f2a7",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"25565/tcp": {}
},
"Tty": true,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"tty=true"
],
"Cmd": [],
"ArgsEscaped": true,
"Image": "gaetan/dockercraft:latest",
"Volumes": {
"/var/run/docker.sock": {}
},
"WorkingDir": "",
"Entrypoint": [
"/srv/Server/start.sh"
],
"OnBuild": null,
"Labels": {}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "8f1cfa1f6cbe9b1b147c5d1aae9c6c67399fa2cb241452f99cbe8469b25ad58b",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"25565/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "25575"
}
]
},
"SandboxKey": "/var/run/docker/netns/8f1cfa1f6cbe",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "7abd3911bb852325cc2ebd30cdb67526be618914e9037a36672ed44897682381",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.5",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:05",
"Networks": {
"bridge": {
"IPAMConfig": {},
"Links": null,
"Aliases": null,
"NetworkID": "d39e6ff4a80b67e36e6e12018bb68cd0130d97d2ae7374f8060a4947cb52351b",
"EndpointID": "7abd3911bb852325cc2ebd30cdb67526be618914e9037a36672ed44897682381",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.5",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:05",
"DriverOpts": null
}
}
}
}
]

[bynarlogic]

Same issue here too.

[tjhorner]

I'm getting this issue as well, and it seems the error is coming from here: https://github.com/docker/dockercraft/blob/master/Docker/tcpclient.lua#L27

So it's trying to connect to something running in the container on port 25566. Running netstat inside of the container yields nothing running under that port, though:

Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp6       0      0 :::8080                 :::*                    LISTEN      17/Cuberite
tcp6       0      0 :::25565                :::*                    LISTEN      17/Cuberite

[tjhorner]

@lolpants' image seems to fix the issue: #86

So I guess a temporary fix until their PR gets merged would be to just use the lolpants/dockercraft image.

[scoobyshi]

I can confirm too on latest MacOS (High Sierra currently), running latest Docker CE, that the current master branch does not work but this lolpants image does: #86;

I also had this same error though on an older version of Linux (Ubuntu Wily 15.10), and an older version of Docker (the last supported version for the EOL Wily): 1.12.6, and lolpants image did not work. However, I took an older commit from this repo (pre multi-stage dockerfile since this older version of Docker couldn't interpret syntax like "alpine:3.6 AS wget"), for example this commit:
git checkout 4c0b567249651634e09cbc3fd1a876fde85d5f70

Then, did a docker build and run, and voila, no more error. Instead just seeing "tcp client OnError: 111: Connection refused" endlessly, it eventually spawned and connected the client with "tcp client connected". Hopefully these instructions help someone else running a legacy version of Linux and Docker ;)

[kloenk]

I can also confirm that on Arch Linux the current version is not running, but I suspect that the error is in the docker binary choosing function in the go code of /bin/dockercraft in the container, because if a link it to the normal docker binary it is working.

Also the docker binary is 0 bytes long:

$ docker exec -it dockercraft /bin/ls -l /bin/docker-18.05.0-ce 
-rw-r--r-- 1 root root 0 Aug 16 12:55 docker-18.05.0-ce

I use this command on the docker host to fix the problem

$ docker exec -it dockercraft /bin/bash -c "rm /bin/docker-18.05.0-ce; ln -s /bin/docker /bin/docker-18.05.0-ce"

If you just remove the docker-18.05.0-ce binary and execute /bin/cubecraft inside the container it fails:

# rm /bin/docker-18.05.0-ce
# dockercraft
INFO[0000] looking for docker binary named: docker-18.05.0-ce 
INFO[0000] docker binary (version 18.05.0-ce) not found. 
INFO[0000] downloading docker-18.05.0-ce...             
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x70 pc=0x5f5ad2]

goroutine 1 [running]:
compress/gzip.(*Reader).Close(0x0, 0x871d20, 0xc4200105c0)
        /usr/local/go/src/compress/gzip/gunzip.go:292 +0x22
main.extractClient(0xc42000e410, 0xc4202cc090, 0x871d20, 0xc4200105c0)
        /go/src/github.com/docker/dockercraft/setup.go:128 +0x2c6
main.getClient(0xc42000e410, 0xc420018550, 0x4c, 0x72be08, 0x0, 0x0)
        /go/src/github.com/docker/dockercraft/setup.go:115 +0xa9
main.(*Daemon).GetDockerBinary(0xc4202aa190, 0x0, 0x0)
        /go/src/github.com/docker/dockercraft/setup.go:54 +0x46d
main.main()
        /go/src/github.com/docker/dockercraft/main.go:30 +0xcf

So I think it would be a possible fix to rename the docker binary in the Dockerfile or remove the version tag from the docker binary called from the go daemon.

[kloenk]

After some more research, I found that the docker maintainer for Arch Linux is building docker based on a tag from Github. But the current package version (18.05.0-ce) is not built and uploaded to https://download.docker.com/linux/static/stable/x86_64/ and so the dockercraft binary tries to download a version that you need to compile by yourself.

[dedztbh]

Same problem here on Arch Linux. I changed the DOCKER_VERSION argument in Dockerfile to 18.09.7 and built the image. The log says docker binary (18.09.7-ce) cannot be found and later gives ton of "tcp client OnError: 111: Connection refused". I suspect that this problem occurs because recent docker builds removed the "-ce" in the filenames.

I made the following modifications to the Dockerfile and it solved the problem for me:
between COPY ./Docker /srv/Server/Plugins/Docker and EXPOSE 25565, addRUN ln -s /bin/docker /bin/docker-18.09.7-ce && ln -s /bin/docker /bin/docker-18.09.7. Then build the image and use it.