Posts tagged lsyncd

linux: lsyncd setup

posted on 2016-05-18 19:08

This was done on ubuntu, but should work accordingly on other linux systems.

install

apt-get install lsyncd
mkdir /etc/lsyncd
mkdir /var/log/lsyncd
touch /var/log/lsyncd/{lsyncd.log,lsyncd-status.log}

I did not know wether the folders and files under /var/log are created automatically, so I just created them myself.

configuration

vim /etc/lsyncd/lsyncd.conf.lua and do something like this:

settings = {
    logfile = "/var/log/lsyncd/lsyncd.log",
    statusfile = "/var/log/lsyncd/lsyncd-status.log",
    statusintervall = 20,
nodaemon = false,
maxProcesses = 5,
maxDelays = 0
}

sync{
        default.rsyncssh,
        source="/var/www/",
        host="<OTHER_HOSTNAME>",
        targetdir="/var/www/",
        rsyncOpts = {"-av", "--delete"}
}
sync{
        default.rsyncssh,
        source="/home/test/",
        host="<OTHER_HOSTNAME>",
        targetdir="/home/test/",
        rsyncOpts = {"-av", "--delete"}
}

This config could be written differently. I don't know lua or what this supposedly is, so I stick with this very basic config.

The configuration is only needed on the host sending data. Of course, ssh has to be set up accordingly.

notes

If you happen to have a lot of files, initial startup can take quite a while. First lsyncd starts and gets a list of all files (or whatever it is that it does), and afterwards the rsync subprocesses are started.

If you want to stop it, it might very likely hang. In that case do ps aux | grep -e lsync -e rsync and see what is running after you already did service lsyncd stop.

To see what exactly the server does, try using iostat -xzd 1 from the sysstat package. While the util% is 100% your IOPS are eaten by something and likely it still does work.

Also use multitail /var/log/lsyncd/* (package lsyncd) to see what lsyncd does. No logs are written during the initial indexing. Also almost none by the initial rsync's for initial setup.

Afterwards the logs will show entries for every new inotified and synced file. Test this by touching files and tailing the logs. :)

inotify's exhausted?

In case you get such an error, you run in the inotify limit.

To check, do cat /proc/sys/fs/inotify/max_user_watches. If it's a number like 8192, this is simply too low. (You want to watch more files than that.)

Temp fix:

echo 1048576 > /proc/sys/fs/inotify/max_user_watches

Permanent fix:

vim /etc/sysctl.conf

fs.inotify.max_user_watches=1048576

Save and exit.

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