394eea0231
This driver implements the storagedriver.StorageDriver interface and
uses Ceph Object Storage as storage backend.
Since RADOS is an object storage and no hierarchy notion, the
following convention is used to keep the filesystem notions stored in
this backend:
* All the objects data are stored with opaque UUID names prefixed
(e.g. "blob:d3d232ff-ab3a-4046-9ab7-930228d4c164).
* All the hierarchy information are stored in rados omaps, where the
omap object identifier is the virtual directory name, the keys in
a specific are the relative filenames and the values the blob
object identifier (or empty value for a sub directory).
e.g. For the following hierarchy:
/directory1
/directory1/object1
/directory1/object2
/directory1/directory2/object3
The omap "/directory1" will contains the following key / values:
- "object1" "blob:d3d232ff-ab3a-4046-9ab7-930228d4c164"
- "object2" "blob:db2e359d-4af0-4bfb-ba1d-d2fd029866a0"
- "directory2" ""
The omap "/directory1/directory2" will contains:
- "object3" "blob:9ae2371c-81fc-4945-80ac-8bf7f566a5d9"
* The MOVE is implemented by changing the reference to a specific
blob in its parent virtual directory omap.
This driver stripes rados objects to a fixed size (e.g. 4M). The idea
is to keep small objects (as done by RBD on the top of RADOS) that
will be easily synchronized accross OSDs. The information of the
original object (i.e total size of the chunks) is stored as a Xattr
in the first chunk object.
Signed-off-by: Vincent Giersch <vincent.giersch@ovh.net>
135 lines
4.7 KiB
Markdown
135 lines
4.7 KiB
Markdown
page_title: Build the development environment
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page_description: Explains how to build the distribution project
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page_keywords: registry, service, images, repository
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# Build the development environment
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If a go development environment is setup, one can use `go get` to install the
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`registry` command from the current latest:
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```sh
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go get github.com/docker/distribution/cmd/registry
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```
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The above will install the source repository into the `GOPATH`. The `registry`
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binary can then be run with the following:
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```
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$ $GOPATH/bin/registry -version
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$GOPATH/bin/registry github.com/docker/distribution v2.0.0-alpha.1+unknown
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```
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The registry can be run with the default config using the following
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incantantation:
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```
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$ $GOPATH/bin/registry $GOPATH/src/github.com/docker/distribution/cmd/registry/config.yml
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INFO[0000] endpoint local-8082 disabled, skipping app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown
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INFO[0000] endpoint local-8083 disabled, skipping app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown
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INFO[0000] listening on :5000 app.id=34bbec38-a91a-494a-9a3f-b72f9010081f version=v2.0.0-alpha.1+unknown
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INFO[0000] debug server listening localhost:5001
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```
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If it is working, one should see the above log messages.
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### Repeatable Builds
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For the full development experience, one should `cd` into
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`$GOPATH/src/github.com/docker/distribution`. From there, the regular `go`
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commands, such as `go test`, should work per package (please see
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[Developing](#developing) if they don't work).
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A `Makefile` has been provided as a convenience to support repeatable builds.
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Please install the following into `GOPATH` for it to work:
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```
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go get github.com/tools/godep github.com/golang/lint/golint
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```
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**TODO(stevvooe):** Add a `make setup` command to Makefile to run this. Have to think about how to interact with Godeps properly.
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Once these commands are available in the `GOPATH`, run `make` to get a full
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build:
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```
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$ GOPATH=`godep path`:$GOPATH make
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+ clean
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+ fmt
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+ vet
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+ lint
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+ build
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github.com/docker/docker/vendor/src/code.google.com/p/go/src/pkg/archive/tar
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github.com/Sirupsen/logrus
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github.com/docker/libtrust
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...
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github.com/yvasiyarov/gorelic
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github.com/docker/distribution/registry/handlers
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github.com/docker/distribution/cmd/registry
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+ test
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...
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ok github.com/docker/distribution/digest 7.875s
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ok github.com/docker/distribution/manifest 0.028s
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ok github.com/docker/distribution/notifications 17.322s
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? github.com/docker/distribution/registry [no test files]
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ok github.com/docker/distribution/registry/api/v2 0.101s
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? github.com/docker/distribution/registry/auth [no test files]
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ok github.com/docker/distribution/registry/auth/silly 0.011s
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...
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+ /Users/sday/go/src/github.com/docker/distribution/bin/registry
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+ /Users/sday/go/src/github.com/docker/distribution/bin/registry-api-descriptor-template
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+ /Users/sday/go/src/github.com/docker/distribution/bin/dist
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+ binaries
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```
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The above provides a repeatable build using the contents of the vendored
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Godeps directory. This includes formatting, vetting, linting, building,
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testing and generating tagged binaries. We can verify this worked by running
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the registry binary generated in the "./bin" directory:
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```sh
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$ ./bin/registry -version
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./bin/registry github.com/docker/distribution v2.0.0-alpha.2-80-g16d8b2c.m
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```
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### Developing
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The above approaches are helpful for small experimentation. If more complex
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tasks are at hand, it is recommended to employ the full power of `godep`.
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The Makefile is designed to have its `GOPATH` defined externally. This allows
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one to experiment with various development environment setups. This is
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primarily useful when testing upstream bugfixes, by modifying local code. This
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can be demonstrated using `godep` to migrate the `GOPATH` to use the specified
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dependencies. The `GOPATH` can be migrated to the current package versions
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declared in `Godeps` with the following command:
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```sh
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godep restore
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```
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> **WARNING:** This command will checkout versions of the code specified in
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> Godeps/Godeps.json, modifying the contents of `GOPATH`. If this is
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> undesired, it is recommended to create a workspace devoted to work on the
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> _Distribution_ project.
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With a successful run of the above command, one can now use `make` without
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specifying the `GOPATH`:
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```sh
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$ make
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```
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If that is successful, standard `go` commands, such as `go test` should work,
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per package, without issue.
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### Optional build tags
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Optional [build tags](http://golang.org/pkg/go/build/) can be provided using
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the environment variable `DOCKER_BUILDTAGS`.
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To enable the [Ceph RADOS storage driver](storage-drivers/rados.md)
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(librados-dev and librbd-dev will be required to build the bindings):
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```sh
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export DOCKER_BUILDTAGS='include_rados'
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```
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