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107 lines
3.7 KiB
Markdown
107 lines
3.7 KiB
Markdown
page_title: Dockerizing an apt-cacher-ng service
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page_description: Installing and running an apt-cacher-ng service
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page_keywords: docker, example, package installation, networking, debian, ubuntu
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# Dockerizing an apt-cacher-ng service
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> **Note**:
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> - **If you don't like sudo** then see [*Giving non-root
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> access*](/installation/binaries/#giving-non-root-access).
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> - **If you're using OS X or docker via TCP** then you shouldn't use
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> sudo.
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When you have multiple Docker servers, or build unrelated Docker
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containers which can't make use of the Docker build cache, it can be
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useful to have a caching proxy for your packages. This container makes
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the second download of any package almost instant.
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Use the following Dockerfile:
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#
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# Build: docker build -t apt-cacher .
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# Run: docker run -d -p 3142:3142 --name apt-cacher-run apt-cacher
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#
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# and then you can run containers with:
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# docker run -t -i --rm -e http_proxy http://dockerhost:3142/ debian bash
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#
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FROM ubuntu
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MAINTAINER SvenDowideit@docker.com
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VOLUME ["/var/cache/apt-cacher-ng"]
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RUN apt-get update && apt-get install -y apt-cacher-ng
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EXPOSE 3142
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CMD chmod 777 /var/cache/apt-cacher-ng && /etc/init.d/apt-cacher-ng start && tail -f /var/log/apt-cacher-ng/*
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To build the image using:
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$ docker build -t eg_apt_cacher_ng .
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Then run it, mapping the exposed port to one on the host
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$ docker run -d -p 3142:3142 --name test_apt_cacher_ng eg_apt_cacher_ng
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To see the logfiles that are `tailed` in the default command, you can
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use:
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$ docker logs -f test_apt_cacher_ng
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To get your Debian-based containers to use the proxy, you can do one of
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three things
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1. Add an apt Proxy setting
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`echo 'Acquire::http { Proxy "http://dockerhost:3142"; };' >> /etc/apt/conf.d/01proxy`
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2. Set an environment variable:
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`http_proxy=http://dockerhost:3142/`
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3. Change your `sources.list` entries to start with
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`http://dockerhost:3142/`
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**Option 1** injects the settings safely into your apt configuration in
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a local version of a common base:
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FROM ubuntu
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RUN echo 'Acquire::http { Proxy "http://dockerhost:3142"; };' >> /etc/apt/apt.conf.d/01proxy
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RUN apt-get update && apt-get install -y vim git
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# docker build -t my_ubuntu .
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**Option 2** is good for testing, but will break other HTTP clients
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which obey `http_proxy`, such as `curl`, `wget` and others:
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$ docker run --rm -t -i -e http_proxy=http://dockerhost:3142/ debian bash
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**Option 3** is the least portable, but there will be times when you
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might need to do it and you can do it from your `Dockerfile`
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too.
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Apt-cacher-ng has some tools that allow you to manage the repository,
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and they can be used by leveraging the `VOLUME`
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instruction, and the image we built to run the service:
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$ docker run --rm -t -i --volumes-from test_apt_cacher_ng eg_apt_cacher_ng bash
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$$ /usr/lib/apt-cacher-ng/distkill.pl
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Scanning /var/cache/apt-cacher-ng, please wait...
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Found distributions:
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bla, taggedcount: 0
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1. precise-security (36 index files)
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2. wheezy (25 index files)
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3. precise-updates (36 index files)
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4. precise (36 index files)
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5. wheezy-updates (18 index files)
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Found architectures:
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6. amd64 (36 index files)
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7. i386 (24 index files)
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WARNING: The removal action may wipe out whole directories containing
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index files. Select d to see detailed list.
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(Number nn: tag distribution or architecture nn; 0: exit; d: show details; r: remove tagged; q: quit): q
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Finally, clean up after your test by stopping and removing the
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container, and then removing the image.
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$ docker stop test_apt_cacher_ng
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$ docker rm test_apt_cacher_ng
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$ docker rmi eg_apt_cacher_ng
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