Remove a lot of outdated "project/PACKAGERS.md" text
This is just a first pass to axe some low hanging fruit. At this point, the project is generally mature enough that I do not believe most of this is necessary. Signed-off-by: Tianon Gravi <admwiggin@gmail.com>
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Tianon Gravi
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@ -4,24 +4,6 @@ If you are looking to make Docker available on your favorite software
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distribution, this document is for you. It summarizes the requirements for
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building and running the Docker client and the Docker daemon.
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## Getting Started
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We want to help you package Docker successfully. Before doing any packaging, a
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good first step is to introduce yourself on the [docker-dev mailing
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list](https://groups.google.com/d/forum/docker-dev), explain what you're trying
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to achieve, and tell us how we can help. Don't worry, we don't bite! There might
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even be someone already working on packaging for the same distro!
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You can also join the IRC channel - #docker and #docker-dev on Freenode are both
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active and friendly.
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We like to refer to Tianon ("@tianon" on GitHub and "tianon" on IRC) as our
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"Packagers Relations", since he's always working to make sure our packagers have
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a good, healthy upstream to work with (both in our communication and in our
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build scripts). If you're having any kind of trouble, feel free to ping him
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directly. He also likes to keep track of what distributions we have packagers
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for, so feel free to reach out to him even just to say "Hi!"
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## Package Name
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If possible, your package should be called "docker". If that name is already
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@ -41,27 +23,7 @@ need to package Docker your way, without denaturing it in the process.
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## Build Dependencies
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To build Docker, you will need the following:
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* A recent version of Git and Mercurial
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* Go version 1.6 or later
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* A clean checkout of the source added to a valid [Go
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workspace](https://golang.org/doc/code.html#Workspaces) under the path
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*src/github.com/docker/docker* (unless you plan to use `AUTO_GOPATH`,
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explained in more detail below)
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To build the Docker daemon, you will additionally need:
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* An amd64/x86_64 machine running Linux
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* SQLite version 3.7.9 or later
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* libdevmapper version 1.02.68-cvs (2012-01-26) or later from lvm2 version
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2.02.89 or later
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* btrfs-progs version 3.16.1 or later (unless using an older version is
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absolutely necessary, in which case 3.8 is the minimum)
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* libseccomp version 2.2.1 or later (for build tag seccomp)
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Be sure to also check out Docker's Dockerfile for the most up-to-date list of
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these build-time dependencies.
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The Dockerfile contains the most up-to-date list of build-time dependencies.
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### Go Dependencies
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@ -69,18 +31,10 @@ All Go dependencies are vendored under "./vendor". They are used by the official
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build, so the source of truth for the current version of each dependency is
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whatever is in "./vendor".
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To use the vendored dependencies, simply make sure the path to "./vendor" is
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included in `GOPATH` (or use `AUTO_GOPATH`, as explained below).
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If you would rather (or must, due to distro policy) package these dependencies
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yourself, take a look at "vendor.conf" for an easy-to-parse list of the
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exact version for each.
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NOTE: if you're not able to package the exact version (to the exact commit) of a
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given dependency, please get in touch so we can remediate! Who knows what
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discrepancies can be caused by even the slightest deviation. We promise to do
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our best to make everybody happy.
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## Stripping Binaries
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Please, please, please do not strip any compiled binaries. This is really
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@ -123,40 +77,11 @@ from the upstream Golang perspective.
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## Building Docker
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Please use our build script ("./hack/make.sh") for all your compilation of
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Docker. If there's something you need that it isn't doing, or something it could
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be doing to make your life as a packager easier, please get in touch with Tianon
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and help us rectify the situation. Chances are good that other packagers have
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probably run into the same problems and a fix might already be in the works, but
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none of us will know for sure unless you harass Tianon about it. :)
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All the commands listed within this section should be run with the Docker source
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checkout as the current working directory.
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### `AUTO_GOPATH`
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If you'd rather not be bothered with the hassles that setting up `GOPATH`
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appropriately can be, and prefer to just get a "build that works", you should
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add something similar to this to whatever script or process you're using to
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build Docker:
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```bash
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export AUTO_GOPATH=1
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```
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This will cause the build scripts to set up a reasonable `GOPATH` that
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automatically and properly includes both docker/docker from the local
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directory, and the local "./vendor" directory as necessary.
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Please use our build script ("./hack/make.sh") for compilation.
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### `DOCKER_BUILDTAGS`
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If you're building a binary that may need to be used on platforms that include
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AppArmor, you will need to set `DOCKER_BUILDTAGS` as follows:
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```bash
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export DOCKER_BUILDTAGS='apparmor'
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```
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If you're building a binary that may need to be used on platforms that include
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If you're building a binary that might be used on platforms that include
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seccomp, you will need to use the `seccomp` build tag:
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```bash
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export DOCKER_BUILDTAGS='seccomp'
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@ -185,69 +110,6 @@ NOTE: if you need to set more than one build tag, space separate them:
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export DOCKER_BUILDTAGS='apparmor exclude_graphdriver_aufs'
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```
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### Static Daemon
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If it is feasible within the constraints of your distribution, you should
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seriously consider packaging Docker as a single static binary. A good comparison
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is Busybox, which is often packaged statically as a feature to enable mass
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portability. Because of the unique way Docker operates, being similarly static
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is a "feature".
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To build a static Docker daemon binary, run the following command (first
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ensuring that all the necessary libraries are available in static form for
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linking - see the "Build Dependencies" section above, and the relevant lines
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within Docker's own Dockerfile that set up our official build environment):
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```bash
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./hack/make.sh binary
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```
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This will create a static binary under
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"./bundles/$VERSION/binary/docker-$VERSION", where "$VERSION" is the contents of
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the file "./VERSION". This binary is usually installed somewhere like
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"/usr/bin/docker".
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### Dynamic Daemon / Client-only Binary
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If you are only interested in a Docker client binary, you can build using:
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```bash
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./hack/make.sh binary-client
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```
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If you need to (due to distro policy, distro library availability, or for other
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reasons) create a dynamically compiled daemon binary, or if you are only
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interested in creating a client binary for Docker, use something similar to the
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following:
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```bash
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./hack/make.sh dynbinary-client
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```
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This will create "./bundles/$VERSION/dynbinary-client/docker-$VERSION", which for
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client-only builds is the important file to grab and install as appropriate.
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### Cross Compilation
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Limited cross compilation is supported due to requiring cgo for critical
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functionality (such as seccomp support).
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To cross compile run `make cross`. You can specify the platforms to target by
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setting the `DOCKER_CROSSPLATFORMS` environment variable to a list of platforms
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in the format `<GOOS>/<GOARCH>`. Specify multiple platforms by using a space
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in between each desired platform.
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For setting arm variants, you can specify the `GOARM` value by append `/v<GOARM>`
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to your `<GOOS>/arm`. Example:
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```
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make DOCKER_CROSSPLATFORMS=linux/arm/v7 cross
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```
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This will create a linux binary targeting arm 7.
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See `hack/make/.binary` for supported cross compliation platforms.
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## System Dependencies
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### Runtime Dependencies
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@ -260,12 +122,7 @@ installed and available at runtime:
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* e2fsprogs version 1.4.12 or later (in use: mkfs.ext4, tune2fs)
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* xfsprogs (in use: mkfs.xfs)
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* XZ Utils version 4.9 or later
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* a [properly
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mounted](https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount)
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cgroupfs hierarchy (having a single, all-encompassing "cgroup" mount point
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[is](https://github.com/docker/docker/issues/2683)
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[not](https://github.com/docker/docker/issues/3485)
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[sufficient](https://github.com/docker/docker/issues/4568))
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* pigz (optional)
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Additionally, the Docker client needs the following software to be installed and
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available at runtime:
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@ -276,11 +133,7 @@ available at runtime:
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The Docker daemon has very specific kernel requirements. Most pre-packaged
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kernels already include the necessary options enabled. If you are building your
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own kernel, you will either need to discover the options necessary via trial and
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error, or check out the [Gentoo
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ebuild](https://github.com/tianon/docker-overlay/blob/master/app-emulation/docker/docker-9999.ebuild),
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in which a list is maintained (and if there are any issues or discrepancies in
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that list, please contact Tianon so they can be rectified).
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own kernel, you should check out `contrib/check-config.sh`.
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Note that in client mode, there are no specific kernel requirements, and that
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the client will even run on alternative platforms such as Mac OS X / Darwin.
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@ -301,8 +154,7 @@ by having support for them in the kernel or userspace. A few examples include:
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Docker expects to run as a daemon at machine startup. Your package will need to
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include a script for your distro's process supervisor of choice. Be sure to
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check out the "contrib/init" folder in case a suitable init script already
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exists (and if one does not, contact Tianon about whether it might be
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appropriate for your distro's init script to live there too!).
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exists.
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In general, Docker should be run as root, similar to the following:
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@ -310,13 +162,5 @@ In general, Docker should be run as root, similar to the following:
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dockerd
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```
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Generally, a `DOCKER_OPTS` variable of some kind is available for adding more
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flags (such as changing the graph driver to use BTRFS, switching the location of
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"/var/lib/docker", etc).
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## Communicate
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As a final note, please do feel free to reach out to Tianon at any time for
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pretty much anything. He really does love hearing from our packagers and wants
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to make sure we're not being a "hostile upstream". As should be a given, we
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appreciate the work our packagers do to make sure we have broad distribution!
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Generally, it is encouraged that additional configuration be placed in
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`/etc/docker/daemon.json`.
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