Haven&#39;t found an answer anywhere... I created a VM (boot2docker) using docker-machine. I need to edit some files using root.

What is the root password in boot2docker?

docker-machine boot2docker root password

I am newbie to the world of virtualization. Can some one explain to me the differences between OpenVZ and Docker?

What could be good for the future?

Pros and cons?


Difference between Docker and OpenVZ

I downloaded and installed Docker for Windows 1.12.1 which in turn installed the docker-machine and docker-compose. I did not install &quot;Docker Toolbox&quot; since its a duplicate of what was installed and my system meets the [requirements][1].

Everything seems to work fine except for docker-machine, I&#39;m running through a tutorial and when I run various docker-machine commands like &quot;ip&quot; or &quot;env&quot; I get the following message.

    Error: No machine name(s) specified and no &quot;default&quot; machine exists.
So when I do a &quot;docker-machine ls&quot; there is nothing in the list even though I do have a Hyper-V docker machine installed and docker commands work fine.

    C:\tmp&gt;docker-machine ls
    NAME   ACTIVE   DRIVER   STATE   URL   SWARM   DOCKER   ERRORS
    C:\tmp&gt;

Am I missing something here? Did I miss something in the documentation? If so can someone please point me in the right direction to fix this?

Thanks for any help,

Jim


  [1]: https://docs.docker.com/docker-for-windows/#/what-to-know-before-you-install

docker-machine: no machine name, no &quot;default&quot; exists

Since `boot2docker` is deprecated I&#39;ve switched to `docker-machine` but I don&#39;t know how to open a port from `docker-machine`. In `boot2docker` I could do like this:

    boot2docker ssh -L 27017:localhost:27017

This would forward port 27017 from VirtualBox to localhost 27017 as long as the SSH connection is open. Note that I&#39;m not looking for a way to open the port permanently in VirtualBox. How can I achieve this with `docker-machine`? 

Port forwarding in docker-machine?

My question is related to [this question](https://stackoverflow.com/questions/22049212/docker-copy-file-from-container-to-host) on copying files from containers to hosts; I have a Dockerfile that fetches dependencies, compiles a build artifact from source, and runs an executable. I also want to copy the build artifact (in my case it&#39;s a `.zip` produced by `sbt dist` in &#39;../target/`, but I think this question also applies to jars, binaries, etc. 

`docker cp` works on containers, not images; do I need to start a container just to get a file out of it? In a script, I tried running `/bin/bash` in interactive mode in the background, copying the file out, and then killing the container, but this seems kludgey. Is there a better way?

On the other hand, I would like to avoid unpacking a `.tar` file after running `docker save $IMAGENAME` just to get one file out (but that seems like the simplest, if slowest, option right now). 

I would use docker volumes, e.g.:

    docker run -v hostdir:out $IMAGENAME /bin/cp/../blah.zip /out

but I&#39;m running `boot2docker` in OSX and I don&#39;t know how to directly write to my mac host filesystem (read-write volumes are mounting inside my boot2docker VM, which means I can&#39;t easily share a script to extract `blah.zip` from an image with others. Thoughts?

Docker - how can I copy a file from an image to a host?

I am trying to mount a host directory into a Docker container so that any updates done on the host is reflected into the Docker containers.

Where am I doing something wrong. Here is what I did:

    kishore$ cat Dockerfile

    FROM ubuntu:trusty
    RUN apt-get update
    RUN apt-get -y install git curl vim
    CMD [&quot;/bin/bash&quot;]
    WORKDIR /test_container
    VOLUME [&quot;/test_container&quot;]

&lt;/code&gt;&lt;/pre&gt;&lt;pre&gt;&lt;code&gt;kishore$ tree
.
├── Dockerfile
└── main_folder
    ├── tfile1.txt
    ├── tfile2.txt
    ├── tfile3.txt
    └── tfile4.txt

1 directory, 5 files
kishore$ pwd
/Users/kishore/tdock
&lt;/code&gt;&lt;/pre&gt;&lt;pre&gt;&lt;code&gt;kishore$ docker build --tag=k3_s3:latest .

    Uploading context 7.168 kB
    Uploading context
    Step 0 : FROM ubuntu:trusty
     ---&gt; 99ec81b80c55
    Step 1 : RUN apt-get update
     ---&gt; Using cache
     ---&gt; 1c7282005040
    Step 2 : RUN apt-get -y install git curl vim
     ---&gt; Using cache
     ---&gt; aed48634e300
    Step 3 : CMD [&quot;/bin/bash&quot;]
     ---&gt; Running in d081b576878d
     ---&gt; 65db8df48595
    Step 4 : WORKDIR /test_container
     ---&gt; Running in 5b8d2ccd719d
     ---&gt; 250369b30e1f
    Step 5 : VOLUME [&quot;/test_container&quot;]
     ---&gt; Running in 72ca332d9809
     ---&gt; 163deb2b1bc5
    Successfully built 163deb2b1bc5
    Removing intermediate container b8bfcb071441
    Removing intermediate container d081b576878d
    Removing intermediate container 5b8d2ccd719d
    Removing intermediate container 72ca332d9809

kishore$ docker run -d -v /Users/kishore/main_folder:/test_container k3_s3:latest
`c9f9a7e09c54ee1c2cc966f15c963b4af320b5203b8c46689033c1ab8872a0ea`&lt;/code&gt;&lt;/pre&gt;&lt;pre&gt;&lt;code&gt;kishore$ docker run -i -t k3_s3:latest /bin/bash

    root@0f17e2313a46:/test_container# ls -al
    total 8
    drwx------  2 root root 4096 Apr 29 05:15 .
    drwxr-xr-x 66 root root 4096 Apr 29 05:15 ..

root@0f17e2313a46:/test_container# exit
exit&lt;/code&gt;&lt;/pre&gt;&lt;pre&gt;&lt;code&gt;kishore$ docker -v
Docker version 0.9.1, build 867b2a9&lt;/code&gt;&lt;/pre&gt;

+ I don&#39;t know how to check boot2docker version

Questions, issues facing:

1. How do I need to link the main_folder to the test_container folder present inside the docker container?
2. I need to make this automatically. How do I to do that without really using the `run -d -v` command?
3. What happens if the boot2docker crashes? Where are the Docker files stored (apart from Dockerfile)?

How to mount a host directory in a Docker container

I want to spawn 3 services in the &quot;host&quot; net using docker-compose. Here is my docker-compose.yml file:

    version: &#39;2&#39;
    services:
      mysql:
        image: mysql
        net: &quot;host&quot;
      nginx:
        image: nginx
        net: &quot;host&quot;
      app:
        image: tomcat
        net: &quot;host&quot;

I got the following error:

    $ docker-compose up
    [31mERROR[0m: Validation failed in file &#39;.\docker-compose.yml&#39;, reason(s):
    Unsupported config option for services.app: &#39;net&#39;
    Unsupported config option for services.mysql: &#39;net&#39;
    Unsupported config option for services.nginx: &#39;net&#39;

I&#39;m using boot2docker on windows.

Docker, and Docker-compose version:

    $ docker -v
    Docker version 1.10.2, build c3959b1
    $ docker-compose -version
    docker-compose version 1.6.0, build cdb920a

If I run all services manually by using `docker run --net = &quot;host&quot;` everything is working fine.

In the documentation I read that **net** command is **supported in docker-compose**:

&gt; **net**
&gt;
&gt; Networking mode. Use the same values as the docker client --net parameter.
&gt; 
&gt; net: &quot;bridge&quot;
&gt; 
&gt; net: &quot;none&quot;
&gt; 
&gt; net: &quot;container:[name or id]&quot;
&gt; 
&gt; net: &quot;host&quot;

https://docs.docker.com/v1.6/compose/yml/#net

What am I doing wrong?


Docker compose, running containers in net:host

I tried this on my Windows 10 machine:

Dockerfile:

&lt;!-- language: lang-none --&gt;

    From microsoft/nanoserver
    CMD [&quot;echo&quot;, &quot;Hello World&quot;]

PS

    C:\FSD\Docker\Trial1&gt; docker build -t lea/leatest .
    Sending build context to Docker daemon  2.048kB
    Step 1/2 : FROM microsoft/nanoserver
    latest: Pulling from microsoft/nanoserver
    bce2fbc256ea: Pulling fs layer
    58f68fa0ceda: Pulling fs layer
    image operating system &quot;windows&quot; cannot be used on this platform



Docker - image operating system &quot;windows&quot; cannot be used on this platform

I have been reading up and learning about &lt;a href=&quot;https://docs.docker.com/&quot;&gt;Docker&lt;/a&gt;, and am trying to correctly choose the Django setup to use. So far there is either:

&lt;a href=&quot;https://docs.docker.com/compose/&quot;&gt;Docker Compose&lt;/a&gt; or [Dockerfile][1]

I understand that _Dockerfiles_ are used in _Docker Compose_, but I am not sure if it is good practice to put everything in one large Dockerfile with multiple `FROM` commands for the different images?

I want to use several different images that include:

    uwsgi
    nginx
    postgres
    redis
    rabbitmq
    celery with cron

Please advise on what are best practices in setting up this type of environment using *Docker*.

If it helps, I am on a Mac, so using &lt;a href=&quot;https://github.com/boot2docker&quot;&gt;boot2docker&lt;/a&gt;.

Some issues I&#39;ve had:

1. Docker Compose is not compatible with Python3
2. I want to containerize my project, so if one large Dockerfile 
is not ideal, then I feel I&#39;d need to break it up using Docker Compose
3. I am OK to make the project Py2 &amp; Py3 compatible, so am leaning towards django-compose


  [1]: https://docs.docker.com/engine/reference/builder/

What&#39;s the difference between Docker Compose vs. Dockerfile

I&#39;m trying create a container to run a program. I&#39;m using a pre configurate image and now I need run the program. However, it&#39;s a machine learning program and I need a dataset from my computer to run. 

The file is too large to be copied to the container. It would be best if the program running in the container searched the dataset in a local directory of my computer, but I don&#39;t know how I can do this.

Is there any way to do this reference with some docker command? Or using Dockerfile?

How can I use a local file on container?

I am working on a task that involves building a docker image with **centOs** as its base using a **Dockerfile** . One of the steps inside the dockerfile needs **http_proxy** and **https_proxy** ENV variables to be set in order to work behind the proxy. 

As this Dockerfile will be used by multiple teams having different proxies, I want to avoid having to edit the Dockerfile for each team.  Instead I am looking for a solution which allows me to pass ENV variables at build time, e.g.,

&gt;sudo docker build -e http_proxy=somevalue .

I&#39;m not sure if there is already an option that provides this.  Am I missing something? 

Can we pass ENV variables through cmd line while building a docker image through dockerfile?

I have written a Dockerfile which looks like this

    FROM ubuntu:12.04
    
    RUN apt-get update
    RUN apt-get install -y wget

Now I&#39;m having a file called `abc.txt` in my host machine. How can I copy it to this container. Is there any step that I can add in Dockerfile which copy from Host to Container.

How to copy file from host to container using Dockerfile

# Intro

I can&#39;t figure out a good way to set up a development environment on OS X using Docker and Boot2Docker. The problem I&#39;m hitting is how to manage the source code so that:

1. I can modify the code on OS X using the tools (text editor, IDE, git, etc) I already have installed.
2. Those modifications are reflected in the Docker container so if I re-run tests or refresh a webpage, I can see my changes immediately.

In theory, this should be easy to do by mounting my source code as a volume:

    docker run -it -v /path/to/my/source/code:/src some-docker-image

Unfortunately, this has two major issues that make it completely unusable on OS X:

# Issue #1: Mounted volumes on VirtualBox (which use vboxsf) are extremely slow

For example, here is how long it takes Jekyll to compile my [homepage](https://github.com/brikis98/yevgeniy-brikman-homepage) if the source code is part of the Docker image:

    &gt; docker run -it brikis98/yevgeniy-brikman-homepage:v1 bash

    root@7aaea30d98a1:/src# time bundle exec jekyll build

    [...]

    real	0m7.879s
    user	0m7.360s
    sys	    0m0.600s

Here is the exact same Docker image, except this time, I mount the source code from OS X:

    &gt; docker run -it -v $(pwd):/src brikis98/yevgeniy-brikman-homepage:v1 bash

    root@1521b0b4ce6a:/src# time bundle exec jekyll build

    [...]

    real	1m14.701s
    user	0m9.450s
    sys	    0m3.410s

# Issue #2: File watching is broken

The default watch mechanisms in SBT, Jekyll, and grunt use technologies such as inotify, which do not work if they are running in a Docker container and the changes are made in OS X to a mounted folder.

# Workarounds I tried

I searched for solutions (including all the ones on SO) and tried out a few of them, but have not found a successful one:

1. I [switched Boot2Docker to use NFS](https://gist.github.com/neilbartley/73f2eb334f04bf95a906), but it was just as slow.
1. I tried [Vagrant + NFS](https://stackoverflow.com/questions/28421391/whats-the-fastest-way-to-migrate-from-boot2docker-to-vagrantnfs-on-mac-os-x), and that was also just as slow.
1. I tried a [Samba mount](http://www.slideshare.net/Docker/dockercon-beahappierdevwithdocker140613160957phpapp02-37589065), but the folder always showed up empty in the Docker container.
1. I tried to use the [Unison file system](https://github.com/leighmcculloch/docker-unison), which worked briefly to sync files, but then kept [showing connection errors](https://github.com/leighmcculloch/docker-unison/issues/2).
1. I enabled [polling in Jekyll](http://salizzar.net/2014/11/06/creating-a-github-jekyll-blog-using-docker/), but that significantly increased the delay until my changes were picked up.
1. I tried [Dinghy](https://github.com/codekitchen/dinghy), a &quot;faster, friendlier Docker on OS X with Vagrant&quot; and got *some* improvement. Instead of Jekyll compilation being 10-15x slower, it was 2-3x slower. That&#39;s better, but still not quite usable.

Has anyone found a solution that actually works and allows you to productively develop code with Docker and OS X?

# Update: a solution at last!

I have finally found a solution that seems productive using Boot2Docker + rsync. I&#39;ve captured the details on how to set this up in [my own answer](https://stackoverflow.com/questions/30090007/whats-the-right-way-to-setup-a-development-environment-on-os-x-with-docker#30111077) as well as an open-source project called [docker-osx-dev](https://github.com/brikis98/docker-osx-dev).

What&#39;s the right way to set up a development environment on OS X with Docker?

I am new to docker. I have a shell script that loads data into impala and I want a docker file that runs builds an image and run the container.
I am on mac, installed boot2docker and have the `DOCKER_HOST` env set up.

    bash-3.2$ docker info
    Containers: 0
    Images: 0
    Storage Driver: aufs
    Root Dir: /mnt/sda1/var/lib/docker/aufs
    Dirs: 0
    Execution Driver: native-0.2
    Kernel Version: 3.15.3-tinycore64
    Debug mode (server): true
    Debug mode (client): false
    Fds: 10
    Goroutines: 10
    EventsListeners: 0
    Init Path: /usr/local/bin/docker
    Sockets: [unix:///var/run/docker.sock tcp://0.0.0.0:2375]

I am trying to just installed a pre-built image using:

    sudo docker pull busybox

I get this error:

  `sudo docker pull busybox
2014/08/18 17:56:19 Post http:///var/run/docker.sock/images/create?fromImage=busybox&amp;tag=: dial unix /var/run/docker.sock: no such file or directory`

Is something wrong with my docker setup?  

When I do a `docker pull busybox`, It pulls the image and download is complete.

    bash-3.2$ docker pull busybox
    Pulling repository busybox
    a9eb17255234: Download complete 
    fd5373b3d938: Download complete 
    d200959a3e91: Download complete 
    37fca75d01ff: Download complete 
    511136ea3c5a: Download complete 
    42eed7f1bf2a: Download complete 
    c120b7cab0b0: Download complete 
    f06b02872d52: Download complete 
    120e218dd395: Download complete 
    1f5049b3536e: Download complete 
    bash-3.2$ docker run busybox /bin/echo Hello Doctor
    Hello Doctor

Am I missing something?
   

docker error: /var/run/docker.sock: no such file or directory

Since I just updated Docker to 1.1.0 I get:

&gt; Error response from daemon: client and server don&#39;t have same version (client : 1.13, server: 1.12)

Do you know how to fix this?

I switched back to 1.0.1 and everything works again.



Docker error: client and server don&#39;t have same version

How does one get the size of a Docker image **before** they pull it to their machine?

Get the size of a Docker image before a pull?

I use `docker logs [container-name]` to see the logs of a specific container.

Is there an elegant way to clear these logs?


Docker: How to clear the logs properly for a Docker container?

I&#39;m new to Docker, using Boot2Docker on OSX. After booting it, this message is given:

    To connect the Docker client to the Docker daemon, please set
    export DOCKER_HOST=tcp://192.168.59.103:2375

Yet even without it, basic Docker commands (eg, `docker run hello-world`) work fine.

The install instructions aren&#39;t very informative:

    Note: If you see a message in the terminal that looks something like this:
    To connect the Docker client to the Docker daemon, please set: 
    export  DOCKER_HOST=tcp://192.168.59.103:2375
    you can safely set the evironment variable as instructed.

Knowing that it&#39;s &quot;safe&quot; doesn&#39;t say why it&#39;s useful.

What I&#39;m not clear on:

1. What is the docker &quot;client&quot;?
2. What is the docker &quot;daemon&quot;?
3. What is the docker &quot;host&quot;? (The Boot2Docker VM itself?)



What does the DOCKER_HOST variable do?

I&#39;m running under boot2docker 1.3.1.

I have a Docker container running a web server via `uwsgi --http :8080`.

If I attach to the container I can browse the web site using `lynx http://127.0.0.1:8080` so I know the server is working.

I ran my container with:

    $ docker run -itP --expose 8080 uwsgi_app:0.2

It has the following details:

    $ docker ps
    CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS                     NAMES
    5248ad86596d        uwsgi_app:0.2     &quot;bash&quot;              11 minutes ago      Up 11 minutes       0.0.0.0:49159-&gt;8080/tcp   cocky_hypatia
    $ docker inspect --format &#39;{{ .NetworkSettings.IPAddress }}&#39; 5248ad86596d
    172.17.0.107

I thought I could access that web site from my host by going to `http://172.17.0.107:49159`.

This does not work. I just see &#39;connecting...&#39; in Chrome, getting nowhere.

What am I doing wrong?


How to access Docker container&#39;s web server from host

I&#39;m running [Mac OS 10.9.5][1] (Mavericks), I&#39;ve followed https://docs.docker.com/installation/mac/ to install Docker.
I get a timeout error message when I run Docker even though the boot2docker VM is running in the background.

    nikhil@macbook ~&gt; boot2docker status
    running
    nikhil@macbook ~&gt; boot2docker ip

    The VM&#39;s Host only interface IP address is: 192.168.59.103

    nikhil@macbook ~&gt; docker run hello-world
    2014/11/01 01:01:31 Post https://192.168.59.103:2376/v1.15/containers/create: dial tcp 192.168.59.103:2376: i/o timeout
    nikhil@macbook ~&gt; docker search ubuntu
    2014/11/01 01:02:40 Get https://192.168.59.103:2376/v1.15/images/search?term=ubuntu: dial tcp 192.168.59.103:2376: i/o timeout

I have verified that Docker is running inside the boot2docker VM and that my port is correct.

    nikhil@macbook ~&gt; boot2docker ssh
                            ##        .
                      ## ## ##       ==
                   ## ## ## ##      ===
               /&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;\___/ ===
          ~~~ {~~ ~~~~ ~~~ ~~~~ ~~ ~ /  ===- ~~~
               \______ o          __/
                 \    \        __/
                  \____\______/
     _                 _   ____     _            _
    | |__   ___   ___ | |_|___ \ __| | ___   ___| | _____ _ __
    | &#39;_ \ / _ \ / _ \| __| __) / _` |/ _ \ / __| |/ / _ \ &#39;__|
    | |_) | (_) | (_) | |_ / __/ (_| | (_) | (__|   &lt;  __/ |
    |_.__/ \___/ \___/ \__|_____\__,_|\___/ \___|_|\_\___|_|
    Boot2Docker version 1.3.1, build master : 9a31a68 - Fri Oct 31 03:14:34 UTC 2014
    Docker version 1.3.1, build 4e9bbfa
    docker@boot2docker:~$ sudo netstat -ntpl | grep docker
    tcp        0      0 :::2376                 :::*                    LISTEN      629/docker

  [1]: http://en.wikipedia.org/wiki/OS_X_Mavericks



Docker can&#39;t connect to boot2docker because of TCP timeout

This stuff is really getting confused now. Can someone please explain what&#39;s going on. Just the straight one liner difference.


* `dockerd`
* `libcontainerd`
* `containerd`
* `docker-containerd`
* `docker-runc`
* `docker-containerd-ctr`
* `docker-containerd-shim`

thanks

dockerd vs docker-containerd vs docker-runc vs docker-containerd-ctr vs docker-containerd-shim

Running out of entropy in virtualized Linux systems seems to be a common problem (e.g. https://stackoverflow.com/questions/4819359/dev-random-extremely-slow, https://stackoverflow.com/questions/5633877/getting-linux-to-buffer-dev-random). Despite of using a hardware random number generator (HRNG) the use of a an entropy gathering daemon like [HAVEGED][1] is often suggested. However an entropy gathering daemon (EGD) cannot be run inside a Docker container, it must be provided by the host.

Using an EGD works fine for docker hosts based on linux distributions like Ubuntu, RHEL, etc. Getting such a daemon to work inside boot2docker - which is based on Tiny Core Linux (TCL) - seems to be another story. Although TCL has a extension mechanism, an extension for an entropy gathering daemon [doesn&#39;t seem to be available][2].

So an EGD seems like a proper solution for running docker containers in a (production) hosting environment, but how to solve it for development/testing in boot2docker?

  [1]: http://www.issihosts.com/haveged/index.html
  [2]: http://forum.tinycorelinux.net/index.php?topic=15650.0

Since running an EGD in boot2docker seemed too difficult, I thought about simply using /dev/urandom instead of /dev/random. Using /dev/urandom is a litte less secure, but still fine for most applications which are not generating long-term cryptographic keys. At least it should be fine for development/testing inside boot2docker. 



All Boot2docker Solutions on Gang of Coders

Total of 22 Boot2docker Solutions

docker-machine boot2docker root password

Difference between Docker and OpenVZ

docker-machine: no machine name, no "default" exists

Port forwarding in docker-machine?

Docker - how can I copy a file from an image to a host?

How to mount a host directory in a Docker container

Docker compose, running containers in net:host

Docker - image operating system "windows" cannot be used on this platform

What's the difference between Docker Compose vs. Dockerfile

How can I use a local file on container?

Can we pass ENV variables through cmd line while building a docker image through dockerfile?

How to copy file from host to container using Dockerfile

What's the right way to set up a development environment on OS X with Docker?

docker error: /var/run/docker.sock: no such file or directory

Docker error: client and server don't have same version

Get the size of a Docker image before a pull?

Docker: How to clear the logs properly for a Docker container?

What does the DOCKER_HOST variable do?

How to access Docker container's web server from host

Docker can't connect to boot2docker because of TCP timeout

dockerd vs docker-containerd vs docker-runc vs docker-containerd-ctr vs docker-containerd-shim

Not enough entropy to support /dev/random in docker containers running in boot2docker