If I do a docker command like
docker -version
I get the error that docker is not installed and that I can do sudo apt-get install docker to install it. If I do this, it says that docker is the latest version. Do I need to set some kind of path to the binary to get it to run?
If I do which docker, there is no answer.
I have found the answer to the question.
Apparently there is a package called "docker" which has nothing to do with docker the container software which is actually docker-ce. The application I had installed was the fake docker, not the container-ware.
To install docker-ce there is a process given on Digital Ocean which can be used.
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Related
I'm trying to install nano , and when using the apt-get install nano command inside the docker, it asks to use the super user:
E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
And when trying to use sudo he says it doesn't exist
bash: sudo: command not found
Most docker containers doesn't provide sudo util. If you need some software in your container you may create your images based on another that you need with installing necessary software by describing in dockerfile.
Also you may install sudo in your custom image.
For docker you need to test each command as running on the local host machine, you have many tools already installed, and the Docker images you have the minimum required usually, so only what is required is installed, and the docker image size can be small also.
Either have a look at what software is installed on the Docker image already using the command compgen -c and then install the software you would require which is not installed, or run your software and see if you receive errors or software not being found, and then install the software required.
Try this:
docker exec -u root -it <your_container_name> bash
and then apt-get install nano.
i've been using a docker container to build the chromium browser (building for Android on Debian 10). I've already created a Dockerfile that contains most of the packages I need.
Now, after building and running the container, I followed the instructions, which asked me to execute an install script (./build/install-build-deps-android.sh). In this script multiple apt install commands are executed.
My question now is, is there a way to install these packages without rebuilding the container? Downloading and building it took rather long, plus rebuilding a container each time a new package is required seems kind of suboptimal. The error I get when executing the install script is:
./build/install-build-deps-android.sh: line 21: lsb_release: command not found
(I guess there will be multiple missing packages). And using apt will give:
root#677e294147dd:/android-build/chromium/src# apt install nginx
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package nginx
(nginx just as an example install).
I'm thankfull for any hints, as I could only find guides that use the Dockerfile to install packages.
You can use docker commit:
Start your container sudo docker run IMAGE_NAME
Access your container using bash: sudo docker exec -it CONTAINER_ID bash
Install whatever you need inside the container
Exit container's bash
Commit your changes: sudo docker commit CONTAINER_ID NEW_IMAGE_NAME
If you run now docker images, you will see NEW_IMAGE_NAME listed under your local images.
Next time, when starting the docker container, use the new docker image you just created:
sudo docker run **NEW_IMAGE_NAME** - this one will include your additional installations.
Answer based on the following tutorial: How to commit changes to docker image
Thanks for #adnanmuttaleb and #David Maze (unfortunately, they only replied, so I cannot accept their answers).
What I did was to edit the Dockerfile for any later updates (which already happened), and use the exec command to install the needed dependencies from outside the container. Also remember to
apt update
otherwise you cannot find anything...
A slight variation of the steps suggested by Arye that worked better for me:
Create container from image and access in interactive mode: docker run -it IMAGE_NAME bin/bash
Modify container as desired
Leave container: exit
List launched containers: docker ps -a and copy the ID of the container just modified
Save to a new image: docker commit CONTAINER_ID NEW_IMAGE_NAME
If you haven't followed the Post-installation steps for Linux
, you might have to prefix Docker commands with sudo.
Installed docker on Centos (running using VirtualBox) following steps below:
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum install docker
sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
And I rebooted my virtual machine, and as I type 'docker --version, I get below:
"Emulate Docker CLI using podman. Create /etc/containers/nodocker to quiet msg. podman version 1.0.5"
Can anybody explain what is going on in my machine?
#swxraft if you run the commands in the order posted in your question
sudo yum install -y yum-utils device-mapper-persistent-data lvm2
sudo yum install docker
sudo yum-config-manager --add-repo
https://download.docker.com/linux/centos/docker-ce.repo
you installed a docker in the REHL repo (probably an alias to podman). And then loaded the repo for the oficial docker but never installed from there.
Extra info:
A) installation docker
How to install docker: follow this link [1] instead #govinda-malavipathirana. Latest docker-ce needs a newer containerd.io but REHL is excluding the ones in the docker repo. So you need to install docker -ce with --nobest (see instructions and error in link). Also you need to disable the firewall.d to have DNS in docker.
B) why docker is not in REHL8
Docker cli and daemon are not supported by REHL8 and its derivatives and it is "blocked" in several ways. Why is not suported -> monolitic and old [2]
Docker images ARE supported using podman. The images created with docker work with podman and viceversa. Also podman commands are the same as docker client.
Podman is a substitute of docker (but it does not use a daemon). They recommend to add a symlink docker -> podman and you will not notice the difference [3]
[1]https://linuxconfig.org/how-to-install-docker-in-rhel-8
[2]http://crunchtools.com/why-no-docker/
[3]https://developers.redhat.com/blog/2019/02/21/podman-and-buildah-for-docker-users/
Docker will not support RedHat 8, it will be installed as Podman.
So you can try it with Amazon linux2 instead of RedHat.
You have to create a new instance in AWS with Amazon linux2, then it will work.
Since docker is not officially supported by REHL8/CentOS8. You have to install it by additional steps.
This is a good article I have found in the internet, shows how to install docker in CentOS 8.
https://computingforgeeks.com/install-docker-and-docker-compose-on-rhel-8-centos-8
I am completely new to docker. I have a Redhat 7 desktop with docker installed.
I now want to run a full fledged ubuntu-desktop 18.04 (including its gnome GUI) via docker. How can this be done? I have been googling for instructions/tutorials on where I can download an ubuntu 18.04 docker image (with GUI support) and run it, but surprisingly I cannot find anything. Can someone help me? Thanks.
I have a different situation, where I run docker on a Windows10 platform. I also tried to install Gnome for some Ubuntu image and start a gnome-session from the terminal. I did not manage to do so.
My current solution is to use Mate instead of Gnome. Maybe my steps are helpful for others that just started with docker:
Install Docker Desktop on Windows 10 and start the Docker application
Install vcxsrv and start it with Xlaunch (also see https://dev.to/darksmile92/run-gui-app-in-linux-docker-container-on-windows-host-4kde)
Get the IP of your computer with ipconfig, e.g 192.111.999.9
Open a console with admin rights and start a docker container. Pass some DISPLAY-Information including your IP:
docker run -it -e DISPLAY=192.111.999.9:0.0 --privileged --name=ubuntu ubuntu
You should then see a linux prompt
Update the package-manager and upgrade existing packages:
apt-get update
apt-get upgrade -y
apt-get update
start dbus service to avoid dbus warnings (also see https://georgik.rocks/how-to-start-d-bus-in-docker-container/):
dbus-uuidgen > /var/lib/dbus/machine-id
mkdir -p /var/run/dbus
dbus-daemon --config-file=/usr/share/dbus-1/system.conf --print-address
install mate (and some themes to avoid theme warning)
apt-get install mate-desktop-environment -y
apt-get ubuntu-mate-themes -y
start a Desktop session with
mate-session
Good luck!
(If you want some more programs, instead of "mate-desktop-environment", you can also use the larger package "ubuntu-mate-desktop". Will take > 10 min to be installed.)
This is an atypical use case for Docker. Docker is normally used to run applications via the command line, or on a server without GUI support. Most operating systems in docker images ship without GUI support.
However, you can enable GUI support with X11. Only with containers that support it though, and not with Ubuntu as far as I can tell. More details on this blog post: https://blog.jessfraz.com/post/docker-containers-on-the-desktop/
For now, just run docker run -it --rm ubuntu:latest bash and you'll launch an Ubuntu 18.04 shell (at the time of this post).
I am new to docker and setting up the environment in my windows 7 laptop to begin learning. I installed docker through docker toolbox. To install docker cloud cli, I followed the official documentation
https://docs.docker.com/docker-cloud/installing-cli/#install
I opened the quick start terminal and executed :
docker run dockercloud/cli -h
but while verifying the cloud version I am getting error 'bash: docker-cloud: command not found'.
Then I tried executing with pip command but didnt work.
I have below tools installed :
Python 2.7.13
Docker version 17.05.0-ce, build 89658be
docker-machine version 0.11.0, build 5b27455
and I have also verified that the docker engine is in running status.
Any help is appreciated.
The docker-cloud commands is not installed as part of the Docker Toolbox installation.
The first command that you run is running a docker container that does run the Docker Cloud CLI. Running this container also is not a way to install the docker-cloud command directly to your windows host. You can always invoke the same 'docker run dockercloud/cli' command to run the CLI containerized.
Similarly, the pip command is not installed as part of the Docker Toolbox installation. pip is something I would expect to be installed if you install Python on your windows system.
If you take a look at: https://docs.docker.com/docker-cloud/installing-cli/#install, the section for installing docker-cloud on windows does include this piece of advice:
If you do not have Python or pip installed, you can either install Python or use this standalone pip installer. You do not need Python for our purposes, just pip.
You did mention that you have python installed, but you are still getting "command not found" when you try to run pip. That could simply be a problem with the $PATH in the quickstart terminal. I would recommend trying the pip command from a powershell window rather than the quickstart terminal. If you do have the pip command somewhere on your system, make sure that the location it is installed to does appear in your $PATH in the bash inside the quickstart terminal.
Once you have pip installed, and in your $PATH, you should be able to run the pip install docker-cloud command.
It would also be a good idea to make sure that the directory holding the installed docker-cloud binary will also appear in your $PATH inside the quickstart terminal.