I am trying to install a xdebug on docker. First I would like to know if I can download it on existing docker container if yes how ?
Sure you can. Simply interact with the container then perform the installation commands.
$ docker exec -it <containerName or ID> /bin/bash
then you will be root in container mostly
# apt update && apt install <application>
Related
What I have:
I am creating a Jenkins(BlueOcean Pipeline) for CI/CD. I am using the docker in docker approach to use Jenkins as described in the Jenkins docs tutorail.
I have tested the setup, it is working fine. I can build and run docker images in the Jenkins container. Now, I am trying to use docker-compose, but it says docker-compose: not found
`
Problem:
Unable to use `docker-compose inside the container(Jenkins).
What I want:
I want to able to use `docker-compose inside the container using the dind(docker in docker) approach.
Any help would be very much appreciated.
Here is my working solution:
FROM maven:3.6-jdk-8
USER root
RUN apt update -y
RUN apt install -y curl
# Install Docker
RUN curl https://get.docker.com/builds/Linux/x86_64/docker-latest.tgz | tar xvz -C /tmp/ && mv /tmp/docker/docker /usr/bin/docker
# Install Docker Compose
RUN curl -L "https://github.com/docker/compose/releases/download/1.29.2/docker-compose-$(uname -s)-$(uname -m)" -o /usr/bin/docker-compose
# Here your customizations...
It seems docker-compose is not installed in that machine.
You can check if docker-compose is installed or not using docker-compose --version. If it is not installed then you can install it in below way :
Using apt- package manager : sudo apt install -y docker-compose
OR
Using python install manager : sudo pip install docker-compose
I am using docker. In one of my container I want to use boto3 so for that I used this command from inside the container
RUN apt-get install boto3
but it showed me like
bash: RUN: command not found
I also tried sudo apt-get install boto3 but it also showed me error like
bash: sudo: command not found
So can someone tell me how to install a package in a docker container?
Update
When I make docker ps -a
I get this
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
distracted_rubin
6a8b04e81122 odoo:11.0 "/entrypoint.sh odoo" 6 weeks ago Up 4 hours 8071/tcp, 0.0.0.0:18069->8069/tcp odoo
As you can see mu container id is 6a8b04e81122 I used this command to go inside container
docker exec -it 6a8b04e81122 /bin/bash
odoo image by default uses a user called odoo. This user doesn't have enough privilege to install a package.
So you have to create a container with different user (i.e) root.
docker run -it --user root odoo:11 bash
Now you created a container with root user context.
You can install boto3 by issuing below command.
apt update
For python 2.x: apt install python-boto3
For python 3.x: apt install python3-boto3
Finally, commit the container to persist the changes.
Update:
You can also open the existing container with a different user by issuing the below command.
docker exec -it --user root <container-id> bash
I want to run an executable and all of its libraries from within my container. How do I do that?
For my Ubuntu 14.04 server, I can do sudo apt-get install tetex-base tetex-bin
In this case, however, someone already set up a docker container for me, and I need to be able to run the program from within the container.
I got it working with
docker exec -it containerName apt-get install tetex-base tetex-bin
See docs.
I have a Jenkins container running inside Docker and I want to use this Jenkins container to spin up other Docker containers when running integration tests etc.
So my plan was to install Docker in the container but this doesn't seem to work so well for me. My Dockerfile looks something like this:
FROM jenkins
MAINTAINER xxxx
# Switch user to root so that we can install apps
USER root
RUN apt-get update
# Install latest version of Docker
RUN apt-get install -y apt-transport-https
RUN apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
RUN sh -c "echo deb https://get.docker.com/ubuntu docker main > /etc/apt/sources.list.d/docker.list"
RUN apt-get update
RUN apt-get install -y lxc-docker
# Switch user back to Jenkins
USER jenkins
The jenkins image is based on Debian Jessie. When I start bash terminal inside container based on the generated image and do for example:
docker images
I get the following error message:
FATA[0000] Get http:///var/run/docker.sock/v1.16/images/json: dial unix /var/run/docker.sock: no such file or directory. Are you trying to connect to a TLS-enabled daemon without TLS?
I suspect that this could be because the docker service is not started. But my next problem arise when I try to start the service:
service docker start
This gives me the following error:
mount: permission denied
I've tracked the error in /etc/init.d/docker to this line:
mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
So my questions are:
How do I actually start a Docker host inside a container? Or is this
something that should be avoided?
Is there something special I need to do if I'm running Mac and boot2docker?
Perhaps I should instead link to the Docker on the host machine as described here?
Update: I've tried the container as user root and jenkins. sudo is not installed.
A simpler alternative is to mount the docker socket and create sibling containers. To do this, install docker on your image and run something like:
docker run -it -v /var/run/docker.sock:/var/run/docker.sock myimage
In the container you should now be able to run docker commands as if you were on the host. The advantage of this method is that you don't need --privileged and get to use the cache from the host. The disadvantage is that you can see all running containers, not just the ones the created from the container.
1.- The first container you start (the one you launch other one inside) must be run with the --privileged=true flag.
2.- I think there is not.
3.- Using the privileged flag you don't need to mount the docker socket as a volume.
Check this project to see an example of all this.
I have a very basic doubt regarding docker.
I have a docker host installed in ubuntuA.
So, to test this from the client(UbuntuB) , should the docker be installed in UbuntuB machine also?
More correct answer is "only docker client" need to be installed in UbuntuB
In UbuntuB, install docker client only, it is around 17M
# apt-get update && apt-get install -y curl
# curl https://get.docker.io/builds/Linux/x86_64/docker-latest -o /usr/local/bin/docker
# chmod +x /usr/local/bin/docker
In order to run docker command, you need talk to daemon in ubuntuA (port 2375 is used since docker 1.0)
$ docker -H tcp://ubuntuA:2375 images
or
$ export DOCKER_HOST tcp://ubuntuA:2375
$ docker images
see more detail in http://docs.docker.com/articles/basics/
Yes,
you have to install docker on both client and server.