Lightweight container builder for Linux backed by make and systemd-nspawn.
npm install -g mkcontainer
First make sure you have systemd-nspawn installed.
Then make a Containerfile which has a format similar to a Dockerfile
FROM ubuntu:xenial
RUN rm -f /etc/resolv.conf && echo '8.8.8.8' > /etc/resolv.conf
RUN apt-get update
RUN apt-get install -y git vim curl
RUN curl -fs https://raw.githubusercontent.com/mafintosh/node-install/master/install | sh
RUN node-install 8.9.1
The above Containerfile installs Ubuntu 16.04 (xenial), then updates the name server so dns works, and installs
git, vim, curl and node 8.9.1.
To make a container from that Containerfile simply cd into the same dir and run
mkcontainerThis should produce a Makefile, that is automatically run and a container called container.img. The container is around 4GB but should be sparse (see ls -lsh for the actual size)
If you run mkcontainer again the build should be cached. Similar to docker, when you update a line in the Containerfile you cache invalidate
every line below it. There is a global cache for each layer stored in ~/.mkcontainer
To run the produced container simply do make run but you can also run it with systemd, ie sudo systemd-nspawn -a -i container.img /bin/bash
The Containerfile currently understands the following primitives
FROM os:version- will bootstrap your container.oscan beUbuntu,Arch,AlpineandDebiancurrently. Note thatArchandAlpinedoesn't have a version.RUN cmd- run a shell command inside the containerENV name=value, name=value...- set env vars for the script. You can use host env resolution in the values.COPY from to- copy a file into the container.toshould be an absolute path.MOUNT from to- auto mount a folder from the host into the container when runningCMD cmd- the command to execute when the container runs
MIT