An excellent 2014 IBM research paper “An Updated Performance Comparison of Virtual Machines and Linux Containers” by Felter et al. provides a comparison between bare metal, KVM, and Docker containers. The general result is: Docker is nearly identical to native performance and faster than KVM in every category. The exception to this is Docker’s NAT — if you … Read more
The specific way to run it depends on whether you gave the image a tag/name or not. $ docker images REPOSITORY TAG ID CREATED SIZE ubuntu 12.04 8dbd9e392a96 4 months ago 131.5 MB (virtual 131.5 MB) With a name (let’s use Ubuntu): $ docker run -i -t ubuntu:12.04 /bin/bash Without a name, just using the … Read more
You may need to switch your docker repo to private before docker push. Thanks to the answer provided by Dean Wu and this comment by ses, before pushing, remember to log out, then log in from the command line to your docker hub account # you may need log out first `docker logout` ref. https://stackoverflow.com/a/53835882/248616 … Read more
As in the comments, there’s no default editor set – strange – the $EDITOR environment variable is empty. You can log in into a container with: docker exec -it <container> bash And run: apt-get update apt-get install vim Or use the following Dockerfile: FROM confluent/postgres-bw:0.1 RUN [“apt-get”, “update”] RUN [“apt-get”, “install”, “-y”, “vim”] Docker images … Read more
The best way to work around this is to specify the Dockerfile independently of the build context, using -f. For instance, this command will give the ADD command access to anything in your current directory. docker build -f docker-files/Dockerfile . Update: Docker now allows having the Dockerfile outside the build context (fixed in 18.03.0-ce). So … Read more
Remove the -it from your cli to make it non interactive and remove the TTY. If you don’t need either, e.g. running your command inside of a Jenkins or cron script, you should do this. Or you can change it to -i if you have input piped into the docker command that doesn’t come from … Read more
Unix To delete all containers including its volumes use, docker rm -vf $(docker ps -aq) To delete all the images, docker rmi -f $(docker images -aq) Remember, you should remove all the containers before removing all the images from which those containers were created. Windows – Powershell docker images -a -q | % { docker … Read more
docker image tag server:latest myname/server:latest or docker image tag d583c3ac45fd myname/server:latest Tags are just human-readable aliases for the full image name (d583c3ac45fd…). So you can have as many of them associated with the same image as you like. If you don’t like the old name you can remove it after you’ve retagged it: docker rmi … Read more
There are a couple ways you can do this. The simplest way to do so is to use the dockerfile ADD command like so: ADD . /path/inside/docker/container However, any changes made to this directory on the host after building the dockerfile will not show up in the container. This is because when building a container, … Read more
Figured it out, use bash -c. Example: command: bash -c “python manage.py migrate && python manage.py runserver 0.0.0.0:8000” Same example in multilines: command: > bash -c “python manage.py migrate && python manage.py runserver 0.0.0.0:8000″ Or: command: bash -c ” python manage.py migrate && python manage.py runserver 0.0.0.0:8000 “