Docker OSX Unable to Access Container via IP Address

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 <[email protected]>

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?

Joachim Isaksson · Accepted Answer · 2016-03-14 18:55:38Z

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.

answered Mar 14, 2016 at 18:55

Joachim Isaksson

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3 Comments

BugHunterUK Over a year ago

192.168.99.100 is the IP of the VM. If I set up two services in seperate containers that need to be accessible over port 80 this wouldn't be possible. Is this a limitation or can this be solved?

Joachim Isaksson Over a year ago

@BugHunterUK As far as I know (although Docker changes fast) it's not available out of the box with the docker command, however there's nothing preventing you from logging onto the docker vm and creating your own network bridge so the machines are exposed directly. I'd call that an advanced topic though.

Joachim Isaksson Over a year ago

@BugHunterUK The containers can (by default) communicate with each other without any extra mapping though, it's only external ports (accessible from the host Mac) that need to be mapped like that.

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