Docker OSX Unable to Access Container via IP Address - docker

Question

I'm having some strange issues with Docker on Mac. When I set up a container I am unable to access it via the containers IP address.
I installed Docker, along with Docker Quickstart Terminal. I've created a basic Dockerfile to test:
FROM ubuntu:14.04
MAINTAINER Me <me#gmail.com>
RUN apt-get update
RUN apt-get install -y nginx
RUN echo "Testing" > /usr/share/nginx/html/index.html
CMD ["nginx", "-g", "daemon off;"]
EXPOSE 80
I build with:
docker build -t james/nginx .
And then run with:
docker run -d james/nginx
I didn't use -p 80:8080 in this instance because at the moment I'm just trying to figure out why I can't access via the containers IP. I can't even ping it.
The container has been giving the title admiring_snyder (Got to love Docker's naming scheme). So I run docker inspect admiring_snyder to get the machines IP address:
[
{
"Id": "2d9ac50726ea5d20905c50f2453aa20cc46eebbcac21966d7cdb29a469ad3c7f",
"Created": "2016-03-14T18:22:24.179971826Z",
"Path": "nginx",
"Args": [
"-g",
"daemon off;"
],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 6837,
"ExitCode": 0,
"Error": "",
"StartedAt": "2016-03-14T18:22:24.245675122Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:921ad9259637823006e092e9ee6441a410fd1c60f2d599ace0ad8a3200d170c7",
"ResolvConfPath": "/mnt/sda1/var/lib/docker/containers/2d9ac50726ea5d20905c50f2453aa20cc46eebbcac21966d7cdb29a469ad3c7f/resolv.conf",
"HostnamePath": "/mnt/sda1/var/lib/docker/containers/2d9ac50726ea5d20905c50f2453aa20cc46eebbcac21966d7cdb29a469ad3c7f/hostname",
"HostsPath": "/mnt/sda1/var/lib/docker/containers/2d9ac50726ea5d20905c50f2453aa20cc46eebbcac21966d7cdb29a469ad3c7f/hosts",
"LogPath": "/mnt/sda1/var/lib/docker/containers/2d9ac50726ea5d20905c50f2453aa20cc46eebbcac21966d7cdb29a469ad3c7f/2d9ac50726ea5d20905c50f2453aa20cc46eebbcac21966d7cdb29a469ad3c7f-json.log",
"Name": "/admiring_snyder",
"RestartCount": 0,
"Driver": "aufs",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"VolumeDriver": "",
"VolumesFrom": null,
"CapAdd": null,
"CapDrop": null,
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"ShmSize": 67108864,
"ConsoleSize": [
0,
0
],
"Isolation": "",
"CpuShares": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": null,
"BlkioDeviceReadBps": null,
"BlkioDeviceWriteBps": null,
"BlkioDeviceReadIOps": null,
"BlkioDeviceWriteIOps": null,
"CpuPeriod": 0,
"CpuQuota": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"KernelMemory": 0,
"Memory": 0,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": -1,
"OomKillDisable": false,
"PidsLimit": 0,
"Ulimits": null
},
"GraphDriver": {
"Name": "aufs",
"Data": null
},
"Mounts": [],
"Config": {
"Hostname": "2d9ac50726ea",
"Domainname": "",
"User": "",
"AttachStdin": false,
"AttachStdout": false,
"AttachStderr": false,
"ExposedPorts": {
"80/tcp": {}
},
"Tty": false,
"OpenStdin": false,
"StdinOnce": false,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"nginx",
"-g",
"daemon off;"
],
"Image": "james/nginx",
"Volumes": null,
"WorkingDir": "",
"Entrypoint": null,
"OnBuild": null,
"Labels": {},
"StopSignal": "SIGTERM"
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "aab80a46210e9ad79b53c60294912ed57a77968ac3178d0cf32ad40f2207e236",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"80/tcp": null
},
"SandboxKey": "/var/run/docker/netns/aab80a46210e",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "f5610deaced494b6a6c692a6e79bbe838f04574bb95f86b3c2b688477f724087",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.4",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:04",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "af5e68119aa41c3fbae80be8760b9382773533ae2c971253970740083ac9e202",
"EndpointID": "f5610deaced494b6a6c692a6e79bbe838f04574bb95f86b3c2b688477f724087",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.4",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:04"
}
}
}
}
]
Which shows the IP address:
"IPAddress": "172.17.0.4"
I am unable to connect to this IP address. I have a feeling it's something to do with docker being ran on a VM (obviously there's no alternative to this). But, I've no idea how to solve it.
The VM has the IP 192.168.99.100. I got this from docker-machine ip default.
Any advice?

Answer 1

You can launch the image with a port mapping;
docker run -d -p 8080:80 james/nginx
This will map port 8080 on the docker vm to port 80 in the docker container as can be seen in docker ps under PORTS;
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS
6c8b6d1a7d3d james/nginx "nginx -g 'daemon off" About a minute ago Up About a minute 0.0.0.0:8080->80/tcp focused_spence
In your case, http://192.168.99.100:8080 will show your test page.