mirror of https://github.com/schoebel/mars
all: prepare publication at github
This commit is contained in:
Thomas Schoebel-Theuer
parent
79f7e6acd3
commit
b8dcbab382
|
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@ -0,0 +1,7 @@
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|||
Main responsible developer: Thomas Schoebel-Theuer (tst@1und1.de)
|
||||
|
||||
Some scripts / testing / docs are from Joerg Mann (freelancer at 1&1)
|
||||
and from Ulrich Goettlich / Ingvar Gilbert (sysadmins).
|
||||
|
||||
Further thanks go to many people inside 1&1 who protected and promoted
|
||||
MARS, influenced my goals and strategies, and gave me the time to do it.
|
||||
|
|
@ -0,0 +1,339 @@
|
|||
GNU GENERAL PUBLIC LICENSE
|
||||
Version 2, June 1991
|
||||
|
||||
Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
|
||||
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||||
Everyone is permitted to copy and distribute verbatim copies
|
||||
of this license document, but changing it is not allowed.
|
||||
|
||||
Preamble
|
||||
|
||||
The licenses for most software are designed to take away your
|
||||
freedom to share and change it. By contrast, the GNU General Public
|
||||
License is intended to guarantee your freedom to share and change free
|
||||
software--to make sure the software is free for all its users. This
|
||||
General Public License applies to most of the Free Software
|
||||
Foundation's software and to any other program whose authors commit to
|
||||
using it. (Some other Free Software Foundation software is covered by
|
||||
the GNU Lesser General Public License instead.) You can apply it to
|
||||
your programs, too.
|
||||
|
||||
When we speak of free software, we are referring to freedom, not
|
||||
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To protect your rights, we need to make restrictions that forbid
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These restrictions translate to certain responsibilities for you if you
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For example, if you distribute copies of such a program, whether
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We protect your rights with two steps: (1) copyright the software, and
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Finally, any free program is threatened constantly by software
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The precise terms and conditions for copying, distribution and
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GNU GENERAL PUBLIC LICENSE
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TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
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0. This License applies to any program or other work which contains
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Activities other than copying, distribution and modification are not
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If any portion of this section is held invalid or unenforceable under
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It is not the purpose of this section to induce you to infringe any
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This section is intended to make thoroughly clear what is believed to
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8. If the distribution and/or use of the Program is restricted in
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9. The Free Software Foundation may publish revised and/or new versions
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Each version is given a distinguishing version number. If the Program
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10. If you wish to incorporate parts of the Program into other free
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NO WARRANTY
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11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
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PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
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YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
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PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGES.
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|
||||
END OF TERMS AND CONDITIONS
|
||||
|
||||
How to Apply These Terms to Your New Programs
|
||||
|
||||
If you develop a new program, and you want it to be of the greatest
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||||
possible use to the public, the best way to achieve this is to make it
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free software which everyone can redistribute and change under these terms.
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||||
To do so, attach the following notices to the program. It is safest
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This program is free software; you can redistribute it and/or modify
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This program is distributed in the hope that it will be useful,
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|
||||
You should have received a copy of the GNU General Public License along
|
||||
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|
||||
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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||||
Also add information on how to contact you by electronic and paper mail.
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||||
If the program is interactive, make it output a short notice like this
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when it starts in an interactive mode:
|
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|
||||
Gnomovision version 69, Copyright (C) year name of author
|
||||
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
|
||||
This is free software, and you are welcome to redistribute it
|
||||
under certain conditions; type `show c' for details.
|
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|
||||
The hypothetical commands `show w' and `show c' should show the appropriate
|
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|
||||
be called something other than `show w' and `show c'; they could even be
|
||||
mouse-clicks or menu items--whatever suits your program.
|
||||
|
||||
You should also get your employer (if you work as a programmer) or your
|
||||
school, if any, to sign a "copyright disclaimer" for the program, if
|
||||
necessary. Here is a sample; alter the names:
|
||||
|
||||
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
|
||||
`Gnomovision' (which makes passes at compilers) written by James Hacker.
|
||||
|
||||
<signature of Ty Coon>, 1 April 1989
|
||||
Ty Coon, President of Vice
|
||||
|
||||
This General Public License does not permit incorporating your program into
|
||||
proprietary programs. If your program is a subroutine library, you may
|
||||
consider it more useful to permit linking proprietary applications with the
|
||||
library. If this is what you want to do, use the GNU Lesser General
|
||||
Public License instead of this License.
|
||||
|
|
@ -0,0 +1 @@
|
|||
See git history in https://github.com/schoebel/mars/commits/master
|
||||
|
|
@ -0,0 +1,84 @@
|
|||
Go to your linux source tree, and apply one of the pre-patches for MARS.
|
||||
You can find them in the subdirectory pre-patches/ of the MARS sources.
|
||||
|
||||
These pre-patches are almost trivial, they contain only a few
|
||||
EXPORT_SYMBOL() statements. Porting to other kernel versions should
|
||||
be trivial. If not, please report a bug :)
|
||||
|
||||
One of the pre-patches has been ported to an openvz kernel
|
||||
even by one of our sysadmins, who usually does no C programming.
|
||||
So this should be no major hurdle.
|
||||
|
||||
Because of the need for some small pre-patches, there is currently
|
||||
no infrastructure for builing MARS seaparately as standalone kernel module.
|
||||
Currently, you have to compile it inplace in your kernel source tree.
|
||||
|
||||
Go to ${your_kernel_source}/block/ and clone the MARS git repository there.
|
||||
|
||||
Then build your kernel as usual.
|
||||
|
||||
In Kconfig, you will find lots of additional options for MARS. Most
|
||||
of them should be left at their default. It suffices just to switch
|
||||
on MARS as a whole, and let it build as a single kernel module.
|
||||
|
||||
Finally, copy userspace/marsadm to some appropriate location in
|
||||
your $PATH.
|
||||
|
||||
Do the following at both your primary and secondary node:
|
||||
|
||||
After booting your pre-patched kernel, don't modprobe mars. Before
|
||||
that, create an empty filesystem with at least 100GB (currently
|
||||
ext3 recommended; there seem to remain some recursion deadlock problems
|
||||
with xfs which will be hopefully fixed in the next time)
|
||||
and mount it to /mars/ .
|
||||
|
||||
Additionally, you need an empty block device having exactly the same
|
||||
size at both nodes. In the following, they are called /dev/vg-x/myspace .
|
||||
|
||||
On the primary:
|
||||
marsadm create-cluster
|
||||
|
||||
On the secondary:
|
||||
marsadm join-cluster ${hostname_of_primary}
|
||||
|
||||
Only after that, do on both nodes:
|
||||
modprobe mars
|
||||
|
||||
On the primary:
|
||||
marsadm create-resource myspace /dev/vg-x/myspace
|
||||
|
||||
Wait a few seconds until the state information about the new resource has
|
||||
spread over the whole cluster.
|
||||
|
||||
On the secondary:
|
||||
marsadm join-resource myspace /dev/vg-x/myspace
|
||||
|
||||
Shortly after that, the initial full sync should start automatically.
|
||||
On the primary, a device /dev/mars/myspace should appear, having exactly
|
||||
the same size as /dev/vg-x/myspace .
|
||||
|
||||
Now you can use /dev/mars/myspace on the primary for creating a filesystem,
|
||||
mounting, or exporting via iSCSI, etc.
|
||||
|
||||
From time to time, you should execute the following commands on one of
|
||||
your nodes:
|
||||
marsadm log-rotate all
|
||||
sleep 10
|
||||
marsadm log-delete-all all
|
||||
... in order to prevent your /mars/ filesystem from running full.
|
||||
|
||||
hint: use cron jobs for automation.
|
||||
|
||||
Most marsadm commands are very similar to drbdadm. A better documentation
|
||||
should appear in the next months. The sourcecode of marsadm is a very
|
||||
simple and stupid perl script, which intentionally does not use any
|
||||
perl module and no OO. The source code will tell you almost anything
|
||||
about the symlinks present in /mars/ until there is better documentation.
|
||||
|
||||
If you are curious about how MARS replicates its state information
|
||||
over the network, just do the following on both nodes:
|
||||
watch ls -l /mars/resource-myspace/
|
||||
|
||||
Alternatively / additionally, you may try Joerg's script mars-status.pl
|
||||
which will deliver colorful state reports from the practical viewpoint
|
||||
of an experienced sysadmin.
|
||||
|
|
@ -0,0 +1,68 @@
|
|||
GPLed software AS IS, sponsored by 1&1 Internet AG (www.1und1.de).
|
||||
|
||||
MARS Light is almost a drop-in replacement for DRBD
|
||||
(that is, block-level storage replication).
|
||||
|
||||
In contrast to plain DRBD, it works _asynchronously_ and over
|
||||
arbitrary distances.
|
||||
|
||||
WARNING! Current stage is BETA. Don't put productive data on it!
|
||||
|
||||
Documentation: currently very rudimentary, some even in German.
|
||||
This will be fixed soon.
|
||||
|
||||
Concepts:
|
||||
|
||||
There is a 2-years old concept paper in German which is so much outdated,
|
||||
that I don't want to publish it. Please be patient until I write a
|
||||
comprehensive paper at the concept level in English.
|
||||
|
||||
For the meantime, please look at my presentation about MARS at LCA2013
|
||||
(linux.conf.au).
|
||||
|
||||
History:
|
||||
|
||||
As you can see in the git log, it evolved from a very experimental
|
||||
concept study, starting in the Summer of 2010.
|
||||
At this time, I was working on it in my spare time.
|
||||
|
||||
In Summer 2011, an "official" internal 1&1 project started, which aimed
|
||||
to deliver a proof of concept.
|
||||
In February 2012, a pilot system was rolled out to an internal statistics
|
||||
server, which collects statistics data from thousands of other servers,
|
||||
and thus produces a very heavy random-access write load, formerly
|
||||
replicated with DRBD (which led to performance problems due to massive
|
||||
randomness). After switching to MARS, the performance was provably
|
||||
better.
|
||||
This server was selected because potential loss of statistics data
|
||||
would be not be that critical as with other productive data, but
|
||||
nevertheless it operates on productive data and loads.
|
||||
|
||||
After curing some small infancy problems, this server runs until today
|
||||
(end of January 2013) without problems. Our sysadmins even switched the
|
||||
primary side a few times, without informing me, so I could
|
||||
sleep better at night without knowing what they did ;)
|
||||
|
||||
In Summer 2012, the next "official" internal 1&1 project started. Its goal
|
||||
is to reach enterprise grade, and therefore to rollout MARS Light on
|
||||
~10 productive servers, starting with less critical systems like ones
|
||||
for test webspaces etc. This project will continue until Summer 2013.
|
||||
|
||||
Hopefully, there will be a followup project for mass rollout to some
|
||||
thousands of servers.
|
||||
|
||||
In December 2012 (shortly before Christmas), I got the official permission
|
||||
from our CTO Henning Kettler to publish MARS under GPL on github.
|
||||
|
||||
Many thanks to him!
|
||||
|
||||
Before that point, I was bound to my working contract which keeps internal
|
||||
software as secret by default (when there is no explicit permission).
|
||||
|
||||
Now there is a chance to build up an opensource
|
||||
community for MARS, partially outside of 1&1.
|
||||
|
||||
Please contribute! I will be open.
|
||||
|
||||
I also try to respect the guidelines from Linus, but probably this
|
||||
will need more work. Help is always welcome!
|
||||
Loading…
Reference in New Issue