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osync v1.2.lyx
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\begin_body
\begin_layout Title
osync v1.2 Documentation
\end_layout
\begin_layout Author
(C) 2013-2017 by Orsiris de Jong
\end_layout
\begin_layout Date
25 March 2017
\end_layout
\begin_layout Standard
\begin_inset CommandInset href
LatexCommand href
name "http://www.netpower.fr/osync"
target "http://www.netpower.fr/osync"
\end_inset
\end_layout
\begin_layout Standard
\begin_inset CommandInset line
LatexCommand rule
offset "0.5ex"
width "100col%"
height "1pt"
\end_inset
\end_layout
\begin_layout Standard
\begin_inset CommandInset toc
LatexCommand tableofcontents
\end_inset
\end_layout
\begin_layout Section
Introduction
\end_layout
\begin_layout Subsection
Quickstart guide
\end_layout
\begin_layout Standard
osync is a command line two way synchronization tool for Linux / BSD / Android
/ Busybox / MacOSX and Windows, with an emphasis on reliability and automation
on low bandwidth links.
\end_layout
\begin_layout Standard
For those who think TL;DR, a quickstart guide can be found in the README.md
file.
\end_layout
\begin_layout Subsection
Basic synchronization problems
\end_layout
\begin_layout Standard
Synchronization is usually found in two flavors, bloc level sync and file
level sync.
While whole bloc level synchronization is generally a good way of doing,
it's also very greedy in network ressources and is not easy to setup.
That's where file level sync comes in handy, where only some directories
& files need to be synced.
\end_layout
\begin_layout Standard
Imagine you're syncing two remote offices of a same company.
If you're syncing a user's home directory or it's roaming profile as a
night task, the next day, the user will find it's roaming profile up to
date at the remote office.
\end_layout
\begin_layout Standard
But what would happen if two users work on the same file in a public folder,
at the same time, on both offices ? Some sync software would stop sync
and ask what to do.
Others might simply deleted the oldest version of the file, even if it
was modified on both sides.
\end_layout
\begin_layout Standard
Also, what would happen if a user uploads a lot of data ? If the link between
both offices cannot handle enough data transfer in a given time, any other
sync task won't be run, and the sync would continue during the day, when
bandwidth is necessary elsewhere.
\end_layout
\begin_layout Standard
What would happen if a power fault occurs while synchronization is going
on ?
\end_layout
\begin_layout Subsection
What osync can do
\end_layout
\begin_layout Subsubsection
Making synchronization reliable
\end_layout
\begin_layout Standard
osync is designed to synchronize two folders on both local and / or remote
systems.
\end_layout
\begin_layout Standard
It is time controlled, which means you can decide how much time it should
spend on a sync task before stopping it and launching the next one.
\end_layout
\begin_layout Standard
It's designed to resume failed or stopped sync tasks in order to gain as
much time as possible, or totally restart the sync task if resuming fails.
\end_layout
\begin_layout Standard
It can keep multiple versions of a file in case of conflicts.
\end_layout
\begin_layout Standard
It handles soft deletion.
If a user deletes a file on replica A, it will move that file on replica
B to the
\begin_inset Quotes sld
\end_inset
.osync_workdir/deleted
\begin_inset Quotes srd
\end_inset
folder.
\end_layout
\begin_layout Standard
It will automatically clean old files (soft deleted and conflict backups)
after a defined amount of days.
\end_layout
\begin_layout Standard
It will perform various checks before launching a synchronization, like
checking for free disk space against a defined minimum value.
\end_layout
\begin_layout Subsubsection
Making a sysadmin's life easier
\end_layout
\begin_layout Standard
osync is also desgined to ease synchronization setups.
\end_layout
\begin_layout Standard
It will trigger an email alert including the whole sync process execution
log if a warning / error is found.
\end_layout
\begin_layout Standard
Pre-processing and post-processing commands can be launched on local and
/ or remote systems, which may be useful to launch snapshot software, flush
or standby virtual machines, etc).
\end_layout
\begin_layout Standard
Multiple concurrent instances of osync can be run as long as they don't
sync the same replicas at the same time.
\end_layout
\begin_layout Standard
A batch processing script is included (osync-batch.sh) to launch sequential
sync tasks.
Failed sync tasks are rerun if every other task has completed and there's
still some time left in a given timespan.
\end_layout
\begin_layout Standard
osync can use rsync or ssh tunnel compression to gain bandwidth.
Bandwidth can also be limited for slow link sharing.
\end_layout
\begin_layout Standard
It can be run in quicksync mode for the impatient (nothing to configure
except the replica paths), or with a full blown config file.
\end_layout
\begin_layout Standard
You may run osync manually, schedule it with cron, or have it monitor a
directory as a daemon and launch sync tasks on file modifications.
\end_layout
\begin_layout Standard
osync has been deeply tested on RHEL / CentOS 5, 6 & 7, Fedora 23, 24 &
25, Debian 6, 7, & 8, Linux Mint 14, 17 & 18, FreeBSD 8.3, 10.3 & 11, pfSense
2.x, Mac OS X, Android using termux, Windows 10 bash, and msys / msys2 &
cygwin environments.
\end_layout
\begin_layout Subsubsection
What osync cannot do
\end_layout
\begin_layout Standard
Contrary to most sync tools, osync is stateful, which means that it doesn't
need an agent installed on computers it synchronizes to.
This makes it gain some degree of fault tolerance with WAN links.
\end_layout
\begin_layout Standard
But this also has some drawbacks, there is a cornercase when a user deletes
a file while the synchronisation is happening, the file won't get deleted
on the other side because the sync is actually updating the directory states
at the same time they get changed.
Even if this happens only on very big deployments in some rare occasions
because of the time osync takes to sync, there is still a chance that your
deletion wouldn't make it.
Generally speaking, the easiest way is to setup osync as a crontask and
launch it by night in order to avoid any possible
\end_layout
\begin_layout Standard
The good point is, osync is built from ground up to keep your data safe,
and there's no chance it will delete anything you didn't want.
\end_layout
\begin_layout Standard
osync is a simple bash script that relies on other tools like rsync.
\end_layout
\begin_layout Standard
Hence, it has some advantages and disavantages:
\end_layout
\begin_layout Standard
Advantages:
\end_layout
\begin_layout Standard
- Easily customisable
\end_layout
\begin_layout Standard
- Fast
\end_layout
\begin_layout Standard
- Agentless
\end_layout
\begin_layout Standard
Disavantages:
\end_layout
\begin_layout Standard
- There's no way to detect file moves.
If you move a directory on replica A, osync will soft delete the directory
on replica B and copy the new directory from replica A.
\end_layout
\begin_layout Standard
- There's no multi-master replication in osync V1.
Hence, if you want to sync replicas A, B, and C using osync, you'll have
to use one of the following schemas:
\end_layout
\begin_layout Paragraph
Replicate 3-way with A as master
\end_layout
\begin_layout Standard
Run the following tasks sequentially where A is the initiatior:
\end_layout
\begin_layout Standard
Replicate A & B
\end_layout
\begin_layout Standard
Replicate A & C
\end_layout
\begin_layout Standard
Replicate A & B
\end_layout
\begin_layout Paragraph
Replicate 3-way with A & B as masters
\end_layout
\begin_layout Standard
Run the following tasks from each system.
Be sure they won't run concurrently (osync will detect that another replication
is still running, and abort the current one):
\end_layout
\begin_layout Standard
Replicate A & B where A is the initiator
\end_layout
\begin_layout Standard
Replicate B & C where B is the initiator
\end_layout
\begin_layout Standard
Replicate C & A where C is the initiator
\end_layout
\begin_layout Subsection
Why use osync
\end_layout
\begin_layout Standard
There are a lot of file sync tools out there, some probably better than
osync depending on the use case.
\end_layout
\begin_layout Standard
osync has been basically written to be low bandwidth friendly, with resume
options for unstable internet links (but it will also do great on a fiber
link :)).
\end_layout
\begin_layout Standard
It has also been written to be a setup and forget tool, without any user
interaction like manual conflict resolution.
\end_layout
\begin_layout Standard
osync also is one of the few tools that
\series bold
support ACL synchronization
\series default
.
\end_layout
\begin_layout Standard
At last, osync consumes very little RAM and CPU ressources and is suitable
from lower en hardware up to serveres.
\end_layout
\begin_layout Subsection
How osync tries to resolve sync issues
\end_layout
\begin_layout Standard
Let's get back to the example above, where osync is used to sync two remote
offices with users' home directories.
\end_layout
\begin_layout Standard
Now imagine a user uploaded 100GB of data, and the WAN link between local
and remote systems can only handle 6GB/hour of data transfer.
\end_layout
\begin_layout Standard
Now if osync is scheduled every night at 10:00 pm, and it's configured to
run for maximum 10 hours, it would stop at 6am, after having transferred
60GB.
\end_layout
\begin_layout Standard
Then, on the next day, it would transfer the remaining 40GB from 10:00 pm
to about 3:30am.
\end_layout
\begin_layout Standard
Also, if you run sequential instances of osync (with osync-batch), one per
user directory for example, you can decide how much time osync should spend
per user.
So if a user uploads too much data, and osync cannot finish the synchronization
task for that user directory in a given timespan, it will stop that sync
task and run next user synchronization task so every user sync task gets
run, regardless of the amount of data.
If there's time left, osync-batch reprograms the user sync task that has
been stopped.
\end_layout
\begin_layout Subsection
Naming in this document
\end_layout
\begin_layout Standard
osync's goal is to synchronize two directories, that can be hosted on the
same computer or two different ones.
\end_layout
\begin_layout Standard
The computer that runs osync must have at least one of these two directories
mounted, and will be called the
\emph on
local system.
\end_layout
\begin_layout Standard
The first directory to sync on the local system is called the
\emph on
initiator replica
\emph default
.
\end_layout
\begin_layout Standard
The other directory, called the
\emph on
target replica
\emph default
can be hosted on the
\emph on
local system
\emph default
, or on another computer which will be called the
\emph on
remote system
\emph default
.
In that case, the
\emph on
local system
\emph default
will connect to the
\emph on
remote system
\emph default
through an ssh tunnel and synchronize both
\emph on
initiator
\emph default
and
\emph on
target replicas
\emph default
.
\end_layout
\begin_layout Standard
Any osync configuration file that gets executed is called an
\emph on
osync task
\emph default
.
\end_layout
\begin_layout Standard
In the following examples, a special user called
\emph on
syncuser
\emph default
is used for osync.
\end_layout
\begin_layout Subsection
How osync solves sync conflicts
\end_layout
\begin_layout Standard
Conflict resolution is done automatically.
When a file is modified on both replicas, osync compares the timestamps
on both replicas and keeps the most recent file.
\end_layout
\begin_layout Standard
In the highly uncommon case where both files have the exact same timestamp,
a configuration value called CONFLICT_PREVALANCE choses the which replica's
file will be kept.
By default, Initiator is chosen, unless specified otherwise in the config
file.
\end_layout
\begin_layout Standard
The file that isn't kept is copied to
\begin_inset Quotes sld
\end_inset
.osync_wordir/backups
\begin_inset Quotes srd
\end_inset
directory of the replica by default, with its full path relative to the
replica, unless specified otherwise by the CONFLICT_BACKUP configuration
value.
\end_layout
\begin_layout Standard
After an amount of days set by CONFLICT_BACKUP_DAYS, which is 30 by default,
the backed up file is deleted.
\end_layout
\begin_layout Standard
If CONFLICT_BACKUP_MULTIPLE is set to YES (disabled by default), multiple
versions of the backed up files are kept, with a timestamp suffix like
\begin_inset Quotes sld
\end_inset
2016.12.31-12.00.01
\begin_inset Quotes srd
\end_inset
.
\end_layout
\begin_layout Section
Prerequisites
\end_layout
\begin_layout Subsection
General packages
\end_layout
\begin_layout Standard
osync is a bash script that will work with
\series bold
bash version 3.2 or better
\series default
, but will not run with ksh / tsh / csh or other shells.
Usually bash comes with most linux distributions.
\end_layout
\begin_layout Standard
Here's a list of commands to install basic prerequisites on both local and
remote machines.
\end_layout
\begin_layout Standard
Note that openssh-clients are only needed on local machine if connecting
remotely and sshpass is only needed if dealing with password files instead
of RSA keys.
\end_layout
\begin_layout Standard
The sudo package is only needed if you plan to run osync remotely with a
standard user that gets sudo privileges.
\end_layout
\begin_layout Standard
Also, inotify-tools / fswatch is only needed if you plan to run osync in
daemon mode (wherever inotify-tools is available).
\end_layout
\begin_layout Itemize
RHEL / CentOS
\end_layout
\begin_deeper
\begin_layout Itemize
\begin_inset listings
inline false
status open
\begin_layout Plain Layout
yum install rsync coreutils openssh-clients sshpass inotify-tools
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Debian / Ubuntu / Mint
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apt-get install rsync openssh-client sshpass inotify-tools
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FreeBSD
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pkg install bash rsync sshpass inotify-tools sudo
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MacOS X
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brew install rsync fswatch
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MSYS (use management interface to install tools)
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msys-base msys-coreutils-ext msys-rsync procps openssh-client
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MSYS2
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pacman -S rsync procps openssh-client
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Cygwin (use management interface to install tools)
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rsync procps-ng openssh wget
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termux (Android / Busybox)
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apk --no-cache add bash rsync openssh-client
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Additionnaly, on termux, shebangs need to be modified to work with the system
root.
Example on how to get osync.sh working:
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termux-fix-shebang osync.sh
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Mail alert prerequisites
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osync can send alert emails on warnings / errors.
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On standard linux distros, BSD, MacOSX and Windows 10 bash, osync relies
on your system-wide configured mail sending support in order to send alerts.
It will try to use mail / mutt & sendmail.
Please make sure that your system is configured to allow outgoing mail.
You may check for osync mail in your mail logs (example: /var/log/maillog
on RHEL / CentOS).
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On android / busybox, you will need sendmail and openssl-tools if you plan
to use mail encryption (TLS/SSL)
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apt --no-cache add sendmail openssl-tools
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On Cygwin / MSYS2, mail support is done via mailsend (https://github.com/muquit/m
ailsend) or sendmail (http://caspian.dotconf.net/menu/Software/SendEmail/)
which have to be executable path (%PATH% variable, or just place them in
system32).
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Daemon mode prerequisites
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osync can run in daermon mode in order to detect file modifications.
This mode works on Linux / BSD and MacOSX.
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On Linux and BSD, please install the following package:
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inotify-tools
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On FreeBSD, you might want to increase kern.maxfiles tunable if you plan
to use inotify-tools for applications that need to monitor activity of
a lot of files.
Modify /boot/loader.conf and add
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kern.maxfiles="25000"
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On MacOS X, you will need to install fswatch with brew:
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brew install fswatch
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Downloading osync
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osync can be downloaded on the author's site (stable version) or on github
(stable or latest dev snapshot).
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Getting osync via author's site
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$ wget http://netpower.fr/projects/osync/osync.v1.2.tar.gz
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$ tar xvf osync.v1.2.tar.gz
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Getting osync via github (remove the -b
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stable
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if you want latest dev snapshot)
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$ git clone -b "stable" https://github.com/deajan/osync
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