mirror of https://github.com/ceph/go-ceph
129 lines
4.8 KiB
Markdown
129 lines
4.8 KiB
Markdown
# go-ceph - Go bindings for Ceph APIs
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[](https://godoc.org/github.com/ceph/go-ceph) [](https://raw.githubusercontent.com/ceph/go-ceph/master/LICENSE)
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## Introduction
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The go-ceph project is a collection of API bindings that support the use of
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native Ceph APIs, which are C language functions, in Go. These bindings make
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use of Go's cgo feature.
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There are three main Go sub-packages that make up go-ceph:
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* rados - exports functionality from Ceph's librados
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* rbd - exports functionality from Ceph's librbd
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* cephfs - exports functionality from Ceph's libcephfs
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We aim to provide comprehensive support for the Ceph APIs over time. This
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includes both I/O related functions and management functions. If your project
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makes use of Ceph command line tools and is written in Go, you may be able to
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switch away from shelling out to the CLI and to these native function calls.
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## Installation
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The code in go-ceph is purely a library module. Typically, one will import
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go-ceph in another Go based project. When building the code the native RADOS,
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RBD, & CephFS library and development headers are expected to be installed.
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On debian based systems (apt) these may be:
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```sh
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libcephfs-dev librbd-dev librados-dev
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```
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On rpm based systems (dnf, yum, etc) these may be:
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```sh
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libcephfs-devel librbd-devel librados-devel
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```
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To quickly test if one can build with go-ceph on your system, run:
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```sh
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go get github.com/ceph/go-ceph
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```
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Once compiled, code using go-ceph is expected to dynamically link to the Ceph
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libraries. These libraries must be available on the system where the go based
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binaries will be run. Our use of cgo and ceph libraries does not allow for
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fully static binaries.
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go-ceph tries to support different Ceph versions. However some functions might
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only be available in recent versions, and others may be deprecated. In order to
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work with non-current versions of Ceph, it is required to pass build-tags to
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the `go` command line. A tag with the named Ceph release will enable/disable
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certain features of the go-ceph packages, and prevent warnings or compile
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problems. For example, to ensure you select the library features that match
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the "nautilus" release, use:
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```sh
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go build -tags nautilus ....
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go test -tags nautilus ....
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```
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### Supported Ceph Versions
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| go-ceph version | Supported Ceph Versions | Deprecated Ceph Versions |
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| --------------- | ------------------------| -------------------------|
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| v0.5.0 | nautilus, octopus | luminous, mimic |
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| v0.4.0 | luminous, mimic, nautilus, octopus | |
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| v0.3.0 | luminous, mimic, nautilus, octopus | |
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| v0.2.0 | luminous, mimic, nautilus | |
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| (pre release) | luminous, mimic (see note) | |
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These tags affect what is supported at compile time. What version of the Ceph
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cluster the client libraries support, and vice versa, is determined entirely
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by what version of the Ceph C libraries go-ceph is compiled with.
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NOTE: Prior to 2020 the project did not make versioned releases. The ability to
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compile with a particular Ceph version before go-ceph v0.2.0 is not guaranteed.
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## Documentation
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Detailed API documentation is available at
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<https://pkg.go.dev/github.com/ceph/go-ceph>.
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Some [API Hints and How-Tos](./docs/hints.md) are also available to quickly
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introduce how some of API calls work together.
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## Development
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```
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docker run --rm -it --net=host \
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--device /dev/fuse --cap-add SYS_ADMIN --security-opt apparmor:unconfined \
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-v ${PWD}:/go/src/github.com/ceph/go-ceph:z \
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-v /home/nwatkins/src/ceph/build:/home/nwatkins/src/ceph/build:z \
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-e CEPH_CONF=/home/nwatkins/src/ceph/build/ceph.conf \
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ceph-golang
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```
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Run against a `vstart.sh` cluster without installing Ceph:
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```
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export CGO_CPPFLAGS="-I/ceph/src/include"
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export CGO_LDFLAGS="-L/ceph/build/lib"
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go build
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```
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## Contributing
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Contributions are welcome & greatly appreciated, every little bit helps. Make code changes via Github pull requests:
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- Fork the repo and create a topic branch for every feature/fix. Avoid
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making changes directly on master branch.
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- All incoming features should be accompanied with tests.
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- Make sure that you run `go fmt` before submitting a change
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set. Alternatively the Makefile has a flag for this, so you can call
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`make fmt` as well.
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- The integration tests can be run in a docker container, for this run:
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```
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make test-docker
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```
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### Interactive "Office Hours"
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The maintenance team plans to be available regularly for questions, comments,
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pings, etc for about an hour twice a week. The current schedule is:
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* 2:00pm EDT (currently 18:00 UTC) Mondays
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* 9:00am EDT (currently 13:00 UTC) Thursdays
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We will use the [#ceph-devel IRC channel](https://ceph.io/irc/)
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