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README.FreeBSD: Update the status #14406

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95 changes: 67 additions & 28 deletions README.FreeBSD
@@ -1,33 +1,68 @@

Last updated: 2016-11-21
Last updated: 2017-04-08

The FreeBSD build will build most of the tools in Ceph.
Note that the (kernel) RBD dependant items will not work since FreeBSD does not
have RBD (yet)
Note that the (kernel) RBD dependant items will not work

I started looking into Ceph, because the HAST solution with CARP and
ggate did not really do what I was looking for. But I'm aiming for
running a Ceph storage cluster on storage nodes that are running ZFS.
In the end the cluster would be running bhyve on RBD disk that are stored in
Ceph.

The FreeBSD build will build most of the tools in Ceph.

Progress from last report:
==========================

Most important change:
- All test run to completion for the current selection of
tools. This is only the case for "My Fork" repository. Some of the
commits need to be pulled into the HEAD
- As of now Cmake is the only way of building Ceph
- And testing would be best done thru ctest.
- Reworked threading/polling code for the simple socket code.
Now uses a selfpipe, instead of using an odd shutdown() signaling
Linux feature.
- Modified the EventKqueue code to work around the "feature" that
starting threads destroys the the kqueue handles.
- ceph-disk should now be able to support FileStore on a ZFS disk.
The main reason that it needs to be ZFS is for xattribute: Size and number.
- A port is submitted: net/ceph-devel.

Other improvements:

* A new ceph-devel update will be submitted in April

- Ceph-Fuse works, allowing to mount a CephFS on a FreeBSD system and do
some work on it.
- Ceph-disk prepare and activate work for FileStore on ZFS, allowing
easy creation of OSDs.
- RBD is actually buildable and can be used to manage RADOS BLOCK
DEVICEs.
- Most of the awkward dependencies on Linux-isms are deleted only
/bin/bash is there to stay.

Getting the FreeBSD work on Ceph:
=================================

pkg install net/ceph-devel

Or:
cd "place to work on this"
git clone https://github.com/wjwithagen/ceph.git
cd ceph
git checkout wip.FreeBSD

Building Ceph
=============
- Go and start building
./do_freebsd.sh

Parts not (yet) included:
=========================

- KRBD
Kernel Rados Block Devices is implemented in the Linux kernel
And perhaps ggated could be used as a template since it does some of
the same, other than just between 2 disks. And it has a userspace
counterpart.
- BlueStore.
FreeBSD and Linux have different AIO API, and that needs to be made
compatible Next to that is there discussion in FreeBSD about
aio_cancel not working for all devicetypes
- CephFS as native filesystem
(Ceph-fuse does work.)
Cython tries to access an internal field in dirent which does not
compile
Build Prerequisites
===================

Expand All @@ -45,21 +80,14 @@ The following setup will get things running for FreeBSD:
- Install bash and link it in /bin
sudo pkg install bash
sudo ln -s /usr/local/bin/bash /bin/bash
- Need to add one compatability line to
/usr/include/errno.h
#define ENODATA 87 /* Attribute not found */
(Otherwise some cython compiles will fail.)
- getopt is used by several testscripts but it requires more than what
the native getopt(1) delivers. So best is to install getopt from ports
and remove/replace the getopt in /usr/bin.

Getting the FreeBSD work on Ceph:
=================================

- cd "place to work on this"
git clone https://github.com/wjwithagen/ceph.git
cd ceph
git checkout wip-wjw-freebsd-cmake
git checkout wip.FreeBSD.201702

Building Ceph
=============
Expand All @@ -69,8 +97,8 @@ Building Ceph
Parts not (yet) included:
=========================

- RBD
Rados Block Devices is implemented in the Linux kernel
- KRBD
Kernel Rados Block Devices is implemented in the Linux kernel
It seems that there used to be a userspace implementation first.
And perhaps ggated could be used as a template since it does some of
the same, other than just between 2 disks. And it has a userspace
Expand All @@ -89,8 +117,8 @@ from the testset
Tests not (yet) include:
=======================

- None, although some test can fail if running tests in parallel and there is
not enough swap. Then tests will start to fail in strange ways.
- None, although some test can fail if running tests in parallel and there is
not enough swap. Then tests will start to fail in strange ways.

Task to do:
===========
Expand Down Expand Up @@ -119,5 +147,16 @@ Task to do:
attention:
in: ./src/common/Thread.cc

- Integrate the FreeBSD /etc/rc.d init scripts in the Ceph stack. Both
- Improve the FreeBSD /etc/rc.d initscripts in the Ceph stack. Both
for testing, but mainly for running Ceph on production machines.
Work on ceph-disk and ceph-deploy to make it more FreeBSD and ZFS
compatible.

- Build test-cluster and start running some of the teuthology integration
tests on these.
Teuthology want to build its own libvirt and that does not quite work
with all the packages FreeBSD already has in place. Lots of minute
details to figure out

- Design a vitual disk implementation that can be used with behyve and
attached to an RBD image.