I have a docker service/image I'm using which restarts as soon as starts.
I'm unable to fix the issue by getting into the container using
docker exec -it CONTAIER_NAME
since it restarts/terminates as soon as it boots.
Is there anyway I can pause it directly? I can't rebuild the image as I don't have access to the internet on the server. (Yes I'm sure the rebuild or build--no-cache will fix the issue)
The issue should be easily fixable if I modify permissions for a certain folder, but I'm not sure how to do this inside the container when I can't access it. The image doesn't have a docker file and is used directly from the docker hub.
If we do not get any information from the container's logs, we have the option to start the process "manually". For this, we start the container with an interactive terminal (-it, -i to keep STDIN open, -t to open a pseudo-TTY) and override the entrypoint to be a shell, e.g. bash. For good measure, we want the container to be removed when it terminates (i.e. when we exit the termainal, --rm):
docker run ... -it --rm --entrypoint /bin/bash
Once inside the container, we can start the process that would have normally started through the entrypoint from the container's terminal and extract error information from here.
I'm running openshift and it does not allow docker containers to run commands as root.
Is there a easy way to check if a custom docker image has commands run by root?
Are you sure this is correct, docker doesn't care what's going on within a VM, and root command would only be able to damage it's own VM.
That said you can open a shell on the image and do some checks
docker run -it gregclinker/boot-docker:1.0.3 /bin/sh
Then you could do:
ps -ef
to check any background processes running and so on.
I have a stopped windows container named "mycake"
Now I would like to start it again and access to its powershell inside the container. How would I do that. Thanks
At the moment I can do something like this
Remove the current container
docker container rm mycake
and then start a new container
docker container run -it --name mycake d_layerfiles powershell
I'm not sure that is the best way
Of course, you can only start a bash shell in a RUNNING container. Start a container by clicking the triangle start icon in Docker Desktop.
Then, as Hitesh Ghuge explained, this works very well, type this in a Powershell or Command Prompt terminal to get a linux command prompt from a linux container:
C:\> docker exec -it CONTAINER_ID /bin/bash
root#dfd92a569d54:/mnt#
Note that in the Docker Desktop app, the Container Name has an icon to copy the hex numeric container id to your clipboard. You may also use the name as id, e.g. laughing_hertz, or the visible part of the hex id, e.g. dfd92a569d54.
(The current directory in the linux shell, e.g. /mnt, probably depends on how the container was originally created, or on the situation on previous exit)
I'm trying to access the file system of a container made with docker-machine. I've used the ssh command but it doesn't seem to have anything that will allow you to list files / folders (like ls).
How would one explore the files currently on a container with docker-machine?
You can create a bash session(assuming your image has bash installed) in a RUNNING container with the following command.
docker exec -ti <container_id> bash
Then you can explore the filesystem of the container.
How can I share a folder between my Windows files and a docker container, by mounting a volume with simple --volume command using Docker Toolbox on?
I'm using "Docker Quickstart Terminal" and when I try this:
winpty docker run -it --rm --volume /C/Users/myuser:/myuser ubuntu
I have this error:
Invalid value "C:\\Users\\myuser\\:\\myuser" for flag --volume: bad mount mode specified : \myuser
See 'docker run --help'.
Following this, I also tried
winpty docker run -it --rm --volume "//C/Users/myuser:/myuser" ubuntu
and got
Invalid value "\\\\C:\\Users\\myuser\\:\\myuser" for flag --volume: \myuser is not an absolute path
See 'docker run --help'.
This is an improvement of the selected answer because that answer is limited to c:\Users folder. If you want to create a volume using a directory outside of c:\Users this is an extension.
In windows 7, I used docker toolbox. It used Virtual Box.
Open virtual box
Select the machine (in my case default).
Right clicked and select settings option
Go to Shared Folders
Include a new machine folder.
For example, in my case I have included:
**Name**: c:\dev
**Path**: c/dev
Click and close
Open "Docker Quickstart Terminal" and restart the docker machine.
Use this command:
$ docker-machine restart
To verify that it worked, following these steps:
SSH to the docker machine.
Using this command:
$ docker-machine ssh
Go to the folder that you have shared/mounted.
In my case, I use this command
$ cd /c/dev
Check the user owner of the folder. You could use "ls -all" and verify that the owner will be "docker"
You will see something like this:
docker#default:/c/dev$ ls -all
total 92
drwxrwxrwx 1 docker staff 4096 Feb 23 14:16 ./
drwxr-xr-x 4 root root 80 Feb 24 09:01 ../
drwxrwxrwx 1 docker staff 4096 Jan 16 09:28 my_folder/
In that case, you will be able to create a volume for that folder.
You can use these commands:
docker create -v /c/dev/:/app/dev --name dev image
docker run -d -it --volumes-from dev image
or
docker run -d -it -v /c/dev/:/app/dev image
Both commands work for me. I hope this will be useful.
This is actually an issue of the project and there are 2 working workarounds:
Creating a data volume:
docker create -v //c/Users/myuser:/myuser --name data hello-world
winpty docker run -it --rm --volumes-from data ubuntu
SSHing directly in the docker host:
docker-machine ssh default
And from there doing a classic:
docker run -it --rm --volume /c/Users/myuser:/myuser ubuntu
If you are looking for the solution that will resolve all the Windows issues and make it work on the Windows OS in the same way as on Linux, then see below. I tested this and it works in all cases. I’m showing also how I get it (the steps and thinking process). I've also wrote an article about using Docker and dealing with with docker issues here.
Solution 1: Use VirtualBox (if you think it's not good idea see Solution 2 below)
Open VirtualBox (you have it already installed along with the docker tools)
Create virtual machine
(This is optional, you can skip it and forward ports from the VM) Create second ethernet card - bridged, this way it will receive IP address from your network (it will have IP like docker machine)
Install Ubuntu LTS which is older than 1 year
Install docker
Add shared directories to the virtual machine and automount your project directories (this way you have access to the project directory from Ubuntu) but still can work in Windows
Done
Bonus:
Everything is working the same way as on Linux
Pause/Unpause the dockerized environment whenever you want
Solution 2: Use VirtualBox (this is very similar to the solution 1 but it shows also the thinking process, which might be usefull when solving similar issues)
Read that somebody move the folders to /C/Users/Public and that works https://forums.docker.com/t/sharing-a-volume-on-windows-with-docker-toolbox/4953/2
Try it, realize that it doesn’t have much sense in your case.
Read entire page here https://github.com/docker/toolbox/issues/607 and try all solutions listed on page
Find this page (the one you are reading now) and try all the solutions from other comments
Find somewhere information that setting COMPOSE_CONVERT_WINDOWS_PATHS=1 environment variable might solve the issue.
Stop looking for the solution for few months
Go back and check the same links again
Cry deeply
Feel the enlightenment moment
Open VirtualBox (you have it already installed along with the docker tools)
Create virtual machine with second ethernet card - bridged, this way it will receive IP address from your network (it will have IP like docker machine)
Install Ubuntu LTS which is very recent (not older than few months)
Notice that the automounting is not really working and the integration is broken (like clipboard sharing etc.)
Delete virtual machine
Go out and have a drink
Rent expensive car and go with high speed on highway
Destroy the car and die
Respawn in front of your PC
Install Ubuntu LTS which is older than 1 year
Try to run docker
Notice it’s not installed
Install docker by apt-get install docker
Install suggested docker.io
Try to run docker-compose
Notice it’s not installed
apt get install docker-compose
Try to run your project with docker-compose
Notice that it’s old version
Check your power level (it should be over 9000)
Search how to install latest version of docker and find the official guide https://docs.docker.com/install/linux/docker-ce/ubuntu/
Uninstall the current docker-compose and docker.io
Install docker using the official guide https://docs.docker.com/install/linux/docker-ce/ubuntu/
Add shared directories to the virtual machine and automount your project directories (this way you have access to the project directory from Ubuntu, so you can run any docker command)
Done
As of August 2016 Docker for windows now uses hyper-v directly instead of virtualbox, so I think it is a little different. First share the drive in settings then use the C: drive letter format, but use forward slashes. For instance I created an H:\t\REDIS directory and was able to see it mounted on /data in the container with this command:
docker run -it --rm -v h:/t/REDIS:/data redis sh
The same format, using drive letter and a colon then forward slashes for the path separator worked both from windows command prompt and from git bash.
I found this question googling to find an answer, but I couldn't find anything that worked. Things would seem to work with no errors being thrown, but I just couldn't see the data on the host (or vice-versa). Finally I checked out the settings closely and tried the format they show:
So first, you have to share the whole drive to the docker vm in settings here, I think that gives the 'docker-machine' vm running in hyper-v access to that drive. Then you have to use the format shown there, which seems to only exist in this one image and in no documentation or questions I could find on the web:
docker run --rm -v c:/Users:/data alpine ls /data
Simply using double leading slashes worked for me on Windows 7:
docker run --rm -v //c/Users:/data alpine ls /data/
Taken from here: https://github.com/moby/moby/issues/12590
Try this:
Open Docker Quickstart Terminal. If it is already open, run $ cd ~ to make sure you are in Windows user directory.
$ docker run -it -v /$(pwd)/ubuntu:/windows ubuntu
It will work if the error is due to typo. You will get an empty folder named ubuntu in your user directory. You will see this folder with the name windows in your ubuntu container.
For those using Virtual Box who prefer command-line approach
1) Make sure the docker-machine is not running
Docker Quickstart Terminal:
docker-machine stop
2) Create the sharing Windows <-> docker-machine
Windows command prompt:
(Modify following to fit your scenario. I feed my Apache httpd container from directory synced via Dropbox.)
set VBOX=D:\Program Files\Oracle\VirtualBox\VBoxManage.exe
set VM_NAME=default
set NAME=c/htdocs
set HOSTPATH=%DROPBOX%\htdocs
"%VBOX%" sharedfolder add "%VM_NAME%" --name "%NAME%" --hostpath "%HOSTPATH%" --automount
3) Start the docker-machine and mount the volume in a new container
Docker Quickstart Terminal:
(Again, I am starting an Apache httpd container, hence that port exposing.)
docker-machine start
docker run -d --name my-apache-container-0 -p 80:80 -v /c/htdocs:/usr/local/apache2/htdocs my-apache-image:1.0
share folders virtualBox toolbox and windows 7 and nodejs image container
using...
Docker Quickstart Terminal [QST]
Windows Explorer [WE]
lets start...
[QST] open Docker Quickstart Terminal
[QST] stop virtual-machine
$ docker-machine stop
[WE] open a windows explorer
[WE] go to the virtualBox installation dir
[WE] open a cmd and execute...
C:\Program Files\Oracle\VirtualBox>VBoxManage sharedfolder add "default" --name
"/d/SVN_FOLDERS/X2R2_WP6/nodejs" --hostpath "\?\d:\SVN_FOLDERS\X2R2_WP6\nodejs" --automount
check in the oracle virtual machine, that the new shared folder has appeared
[QST] start virtual-machine
$ docker-machine start
[QST] run container nodejs
docker stop nodejs
docker rm nodejs
docker run -d -it --rm --name nodejs -v /d/SVN_FOLDERS/X2R2_WP6/nodejs:/usr/src/app -w /usr/src/app node2
[QST] open bash to the container
docker exec -i -t nodejs /bin/bash
[QST] execute dir and you will see the shared files
I solved it!
Add a volume:
docker run -d -v my-named-volume:C:\MyNamedVolume testimage:latest
Mount a host directory:
docker run -d -v C:\Temp\123:C:\My\Shared\Dir testimage:latest