This document is for a development version of Ceph.
Continuous Integration Architecture¶
In Ceph, we rely on multiple CI pipelines in our development. Most of these pipelines are centered around Jenkins. And their configurations are generated using Jenkins Job Builder.
Let’s take the
make check performed by Jenkins as an example.
ceph-pull-requests is a jenkins job which gets triggered by a GitHub pull
request or a trigger phrase like:
jenkins test make check
There are multiple parties involved in this jenkins job:
- Sepia Lab
Sepia Lab is a test lab used by the Ceph project. This lab offers the storage and computing resources required by our CI infra.
- Jenkins agents
are a set of machines which perform the CI jobs. In this case, they
pull the git repo from GitHub and
rebase the pull request against the latest master
set necessary environment variables
is a server offering RESTful API allowing the clients to store and retrieve binary packages. It also creates the repo for uploaded packages automatically. Once a certain repo is created on chacra, the configured shaman server is updated as well, then we can query shaman for the corresponding repo address. Chacra not only hosts Ceph packages, it also hosts quite a few other packages like various build dependencies.
is a server offering RESTful API allowing the clients to query the information of repos hosted by chacra nodes. Shaman is also known for its Web UI. But please note, shaman does not build the packages, it justs offers information of the builds.
Just like lots of other software projects, Ceph has both build-time and run-time dependencies. Most of time, we are inclined to use the packages prebuilt by the distro. But there are cases where
the necessary dependencies are either missing in the distro, or
their versions are too old, or
they are packaged without some important feature enabled.
we want to ensure that the version of a certain runtime dependency is identical to the one we tested in our lab.
No matter what the reason is, we either need to build them from source, or
to package them as binary packages instead of using the ones shipped by the
distro. Quite a few build-time dependencies are included as git submodules,
but in order to avoid rebuilding these dependencies repeatedly, we pre-built
some of them and uploaded them to our own repos. So, when performing
make check, the building hosts in our CI just pull them from our internal
repos hosting these packages instead of building them.
So far, following packages are prebuilt on ubuntu focal:
packages boost. The packages’ names are changed from
ceph-libboost-*, and they are instead installed into
/opt/ceph, so they don’t interfere with the official
libboostpackages shipped by distro. Its build scripts are hosted at https://github.com/tchaikov/ceph-boost.
tar xjf boost_1_76_0.tar.bz2 git clone https://github.com/tchaikov/ceph-boost cp -ra ceph-boost/debian boost_1_76_0/ export DEB_BUILD_OPTIONS='parallel=6 nodoc' dpkg-buildpackage -us -uc -b
packages libzbd . The upstream libzbd includes debian packaging already.
But in addition to these libraries,
ceph-mgr-dashboard’s frontend uses lots of
mention the trouble of testing different combination of versions of these
Also, because our downstream might not want to use the prepackaged binaries when redistributing the precompiled Ceph packages, so we also need to include these libraries in our dist tarball. They are
make-dist is a script used by our CI pipeline to create dist tarball so the
tarball can be used to build the Ceph packages in a clean room environmet. When
we need to upgrade these third party libraries, we should
update the CMake script
rebuild the prebuilt packages and
update this script to reflect the change.