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 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

There is something that I am not getting when developing an application while using `docker` containers. 

Lets say I am developing a java application and I set up a java container with jdk 8 base image, I still need to install java 8 jdk on my local development machine, since the IDE which I am going to use is going to look for runtime libraries on the local machine not the docker container.

Is this right or am I missing something? Somethings I will be able to do entirely on the docker container like setting up a database but some things I will also have to do on my local development machine and try to match it up with my docker image for example a language runtime like java or python for the sake of using the IDE.

Using an IDE while developing on a docker container

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?

EDIT (2/19/21): A lot of time has elapsed since I asked this original question years ago and I&#39;ve seen a flurry of activity since then. I re-selected an answer which I think is consistent with the most localized and safe option for solving this issue (which is typically associated with docker-compose). While docker did introduce the `prune` command, it is generally a dangerous operation and I would be cautious about using it as you may unintentionally impact other applications or setups you have on your machine

--- 

I&#39;ve been having issues with removing Docker volumes with Docker 1.9.1.

I&#39;ve removed all my stopped containers so that `docker ps -a` returns empty.

When I use `docker volume ls`, I&#39;m given a whole host of Docker containers:

    docker volume ls
    DRIVER              VOLUME NAME
    local               a94211ea91d66142886d72ec476ece477bb5d2e7e52a5d73b2f2f98f6efa6e66
    local               4f673316d690ca2d41abbdc9bf980c7a3f8d67242d76562bbd44079f5f438317
    local               eb6ab93effc4b90a2162e6fab6eeeb65bd0e4bd8a9290e1bad503d2a47aa8a78
    local               91acb0f7644aec16d23a70f63f70027899017a884dab1f33ac8c4cf0dabe5f2c
    local               4932e2fbad8f7e6246af96208d45a266eae11329f1adf176955f80ca2e874f69
    local               68fd38fc78a8f02364a94934e9dd3b5d10e51de5b2546e7497eb21d6a1e7b750
    local               7043a9642614dd6e9ca013cdf662451d2b3df6b1dddff97211a65ccf9f4c6d47
    #etc x 50

Since none of these volumes contain anything important, I try to purge all the volumes with `docker volume rm $(docker volume ls -q)`.

In the process, the majority are removed, but I get back:

    Error response from daemon: Conflict: volume is in use
    Error response from daemon: Conflict: volume is in use
    Error response from daemon: Conflict: volume is in use
    Error response from daemon: Conflict: volume is in use
    Error response from daemon: Conflict: volume is in use

For a sizeable portion of them. If I don&#39;t have any containers existing in the first place, how are these volumes being used?



Docker is in volume in use, but there aren&#39;t any Docker containers

I got some docker containers running on **AWS EC2**, the /var/lib/docker/overlay2 folder grows very fast in disk size.

I&#39;m wondering if it is safe to delete its content?
or if docker has some kind of command to free up some disk usage.


_________
**UPDATE:**

I actually tried `docker system prune -a` already, which reclaimed 0Kb.

Also my /docker/overlay2 disk size is much larger than the output from `docker system df`

After reading docker documentation and BMitch&#39;s answer, I believe it is a stupid idea to touch this folder and I will try other ways to reclaim my disk space.


Is it safe to clean docker/overlay2/

I installed [Docker-Toolbox][1] just now while following their [webpage][2] 

I started with `Docker QuickStart Terminal` and see following


                            ##         .
                      ## ## ##        ==
                   ## ## ## ## ##    ===
               /&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;&quot;\___/ ===
          ~~~ {~~ ~~~~ ~~~ ~~~~ ~~~ ~ /  ===- ~~~
               \______ o           __/
                 \    \         __/
                  \____\_______/
    
    
    docker is configured to use the default machine with IP 192.168.99.100
    For help getting started, check out the docs at https://docs.docker.com
    
    bash-3.2$ 

 
But when I try to perform `docker pull hello-world`, this is what I see  

    bash-3.2$ docker run hello-world
    Unable to find image &#39;hello-world:latest&#39; locally
    Pulling repository docker.io/library/hello-world
    Network timed out while trying to connect to https://index.docker.io/v1/repositories/library/hello-world/images. You may want to check your internet connection or if you are behind a proxy.
    bash-3.2$ 

What&#39;s wrong?

  [1]: https://www.docker.com/toolbox
  [2]: http://docs.docker.com/mac/step_one/


Network timed out while trying to connect to https://index.docker.io

I finally figured out how to get docker up and running. 

    docker run --name my-forum-nodebb --link my-forum-redis:redis -p 80:80 -p 443:443 -p 4567:4567 -P -t -i nodebb/docker:ubuntu

I linked it to a redis instance, cool. 

This is from scratch and I assume that when I created the redis instance 

    docker run --name my-forum-redis -d -p 6379:6379 nodebb/docker:ubuntu-redis

it pulls the image from a remote repo?

NodeBB offers a `Dockerfile` https://github.com/NodeBB/NodeBB/blob/master/Dockerfile I am not really quite sure how to use it. I am assuming that I can somehow create a local environment by calling this Dockerfile on my remote.

Is this correct? If so how can I create the local instance pointing to the remote?



How do I run a docker instance from a DockerFile?

I&#39;m trying to set up Docker Machine with Docker Compose.

**Scenario 1 (without Docker Machine)**  
If I run `docker-compose up -d` without Docker Machine, it creates my 3 linked containers as intented (nginx+mongodb+nodejs).

**Scenario 2 (with Docker Machine)**  
Then I create a VM using Docker Machine and tell Docker to talk to that machine with `eval $(docker-machine env streambacker-dev)`.

At this point, if I ssh to my docker machine and run `df -h`, I get:  

![docker machine df -h](http://imgur.com/K4SoPTC.png)

If I then run `docker-compose up -d`, I get a [&quot;no space left on device&quot; error](http://imgur.com/ROS74NF) while downloading the last container.

&quot;tmpfs&quot; seems to be indeed a bit full after that:

![docker machine df -h](http://imgur.com/KHcOqIX.png)

Checking the **--virtualbox-disk-size** option shows that it defaults to 20000 MB, which I think is what we can see as &quot;/dev/sda1&quot; on both pictures. So why are containers filling up &quot;tmpfs&quot; n and what exactly is &quot;tmpfs&quot;? Is is a temporary download directory? **How can I create more space for my containers?**

Thanks!

For information, I&#39;m using *Docker Machine 0.4.0-rc2* and *Docker Compose 1.3.2*.

Docker Machine: No space left on device

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

Docker Swarm can manage two types of storage:

`volume` and `bind`

While `bind` is not suggested by Docker Documentation since it creates a binding between a local directory (on each swarm Node) to a task, the `volume` implementation is not mentioned, so I don&#39;t understand how volumes are shared between tasks?

- How does Docker Swarm shares volumes between nodes?
- Where are volumes saved (on a manager? And if there is more than one manager?)
- Is there no problem between nodes if it&#39;s running on different machines on different networks?
- Does it create a VPN?

How does Docker Swarm implement volume sharing?

I am new to Docker, and trying to go through this tutorial setting up MemSQL from a Docker image - http://docs.memsql.com/4.0/setup/docker/ .  I am on a Mac, and the tutorial uses `boot2docker` which seems to have been deprecated.  

The VM needs 4GB memory to run.  The tutorial specifies how to do this with `boot2docker` but I cannot find a way to do this with the docker-machine/docker toolbox. 

Here is the command I am using and the error I am getting just trying to go through the tutorial without altering the boot2docker config.  

    docker run --rm --net=host memsql/quickstart check-system
    Error: MemSQL requires at least 4 GB of memory to run.

How to increase docker-machine memory Mac

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?

How to restart all running docker containers? Mainly looking for a shortcut instead of doing 

&gt; docker restart containerid1 containerid2

Command for restarting all running docker containers?

docker-machine version 0.2.0
docker version 1.6.2

I&#39;m using [docker-machine to create a machine using VirtualBox][1].  Everything works fine but I&#39;d like to ssh into the machine itself and I find no instructions on how to do this.  I can connect to the ssh port:

    ssh $(docker-machine ip dev)

But I&#39;ve no idea what username / password / identity file to use.


  [1]: https://docs.docker.com/machine/#getting-started-with-docker-machine-using-a-local-vm

How to ssh into docker-machine VirtualBox instance?

[Docker for Mac](https://docs.docker.com/docker-for-mac/) uses a Linux VM created by [HyperKit](https://github.com/docker/HyperKit/) for storing and running containers on Mac.

With Docker Toolbox, I can just open VirtualBox and access the docker-machine VM. But with Docker for Mac, how do I access the VM created by HyperKit?

How to access the VM created by docker&#39;s HyperKit?

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

Running a python script in a docker container and everything seems to be running smoothly, seeing some STDOUT messages, about 5 minutes in I get a `Killed` message with no further explanation and the process stops. Querying a db so could be a disk space issue, could be OOM issue. I&#39;m not sure but I have no idea where to find logs about this kill message so I can get to the root of this problem. Any ideas where these logs are?

Running docker-machine on Mac OSX.

That&#39;s really all the message says!

    root@c7b800e0f276:/opt/mymodule# python
    Python 2.7.13 (default, May  1 2017, 22:44:36)
    [GCC 4.9.2] on linux2
    Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quot;license&quot; for more information.
    &gt;&gt;&gt; from mymodule import model
    &gt;&gt;&gt; model.run(&#39;2017-04-01&#39;)
    INFO:Deleting from input table.
    INFO:Inserting into input table.
    INFO:Querying input table for chunk.
    Killed
    root@c7b800e0f276:/opt/mymodule# exit

Thanks!

Docker process killed with cryptic `Killed` message

I am new to dockers. When I am running the docker pull sonarqube I am getting the following error.

**Error response from daemon: Get https://registry-1.docker.io/v2/: dial TCP: lookup registry-1.docker.io on 192.168.65.1:53: no such host**

Can you please let me know why I am getting the error and how can I rectify this.

Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io on 192.168.65.1:53: no such host

I am using docker toolbox on Windows 7 to run docker. (docker version 1.9.1)

As it turns out, the docker machine creates its VM at C:\Users\username\\.docker\machine\machines\default. As I commit the images, the size of VM at this location bloats up. Since it&#39;s Windows, I can&#39;t afford the luxury of space on the C drive. 

Is there any way I can change the location of the default machine?

Change Docker machine location - Windows

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 trying to extend a docker container for SOLR. I just want to install `vim` into it. But when I run the docker build it complains that I&#39;m not root.

This is the DockerFile that I&#39;m extending:
https://github.com/makuk66/docker-solr/blob/master/5.3/Dockerfile

And my build file is this:

    FROM makuk66/docker-solr
    MAINTAINER OCSCommerce Team &lt;support@ocscommerce.com&gt;
    RUN apt-get update
    RUN apt-get --assume-yes install vim
    COPY home/ocscommerce /etc/solr/home

Then it outputs this:

    192.168.99.100
    localhost:solr$ docker build -t ocscommerce/solr .
    Sending build context to Docker daemon 39.66 MB
    Step 0 : FROM makuk66/docker-solr
     ---&gt; 92be2fe79f15
    Step 1 : MAINTAINER OCSCommerce Team &lt;support@ocscommerce.com&gt;
     ---&gt; Using cache
     ---&gt; a3ac70e40324
    Step 2 : RUN apt-get update
     ---&gt; Running in c865716a2694
    E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied)
    E: Unable to lock directory /var/lib/apt/lists/
    E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied)
    E: Unable to lock the administration directory (/var/lib/dpkg/), are you root?

Is there any way to install a package into this container? Or would I need to copy the original build file from makuk66?

How to install new packages into non-root Docker Container?

Is there a way I can reach my docker containers using names instead of ip addresses?

I&#39;ve heard of pipework and I&#39;ve seen some dns and hostname type options for docker, but I still am unable to piece everything together.

Thank you for your time.

I&#39;m not sure if this is helpful, but this is what I&#39;ve done so far:

- installed docker container host using docker-machine and the vmwarevsphere driver
- started up all the services with docker-compose
- I can reach all of the services from any other machine on the network using IP and port

I&#39;ve added a DNS alias entry to my private network DNS server and it matches the machine name that&#39;s used by docker-machine.  But the machine always picks up a different IP address when it boots and connects to the network.

I&#39;m just lost as to where to tackle this:

- network DNS server
- docker-machine hostname
- docker container hostname
- probably some combination of all of them

I&#39;m probably looking for something similar to this question:

https://stackoverflow.com/questions/27342382/how-can-let-docker-use-my-network-router-to-assign-dhcp-ip-to-containers-easily

Any general direction will be awesome...thanks again!



How to reach docker containers by name instead of IP address?

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

If Docker community runs natively on windows, then why does it need Hyper-v? I.E., doesn&#39;t native imply that Docker-Engine can run instructions on windows? It looks to me like it still starts up a Linux VM and runs with-in that.

To me, is seems that docker-toolbox uses an oracle hyper-visor running linux, while Docker community uses Hyper-V running linux. Is there another important difference that I&#39;m overlooking?

Is this correct? Am I understanding the word &quot;native&quot; wrong, is docker mis-using the word, or is there some other aspect I&#39;m missing?

The reason I&#39;m asking, is because I noticed that you don&#39;t use Docker-machine with the community edition, and I&#39;m wondering why that is. Is docker-machine the thing that runs natiely on windows, while Docker Engine doesn&#39;t? I think the word docker is over-loaded and maybe leads to confusion in this case :)

Thanks in advance!

All Docker Machine Solutions on Gang of Coders

Total of 25 Docker Machine Solutions