Installing a Web, Email & MySQL Database Cluster on Debian 8.4 Jessie with ISPConfig 3.1 - Page 4

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  1. 7 Install Unison

7 Install Unison

Next we install Unison. Unison is used to sync the /var/www directory between server1 and server2.

Install unison on server1 and server2 with

apt-get install unison

Now we install a unison configuration file on server1:

Create a new file /root/.unison/web:

mkdir /root/.unison
vi /root/.unison/web.prf

... and add the following content:

# Roots of the synchronization
root = /var/www
root = ssh://
# Paths to synchronize
#path = www
#path = vmail
# Some regexps specifying names and paths to ignore
#ignore = Path stats    ## ignores /var/www/stats
#ignore = Path stats/*  ## ignores /var/www/stats/*
#ignore = Path */stats  ## ignores /var/www/somedir/stats, but not /var/www/a/b/c/stats
#ignore = Name *stats   ## ignores all files/directories that end with "stats"
#ignore = Name stats*   ## ignores all files/directories that begin with "stats"
#ignore = Name *.tmp    ## ignores all files with the extension .tmp
ignore = Name sess_*
ignore = Name *access.log*
ignore = Name error.log
ignore = Name webalizer.conf
# When set to true, this flag causes the user interface to skip # asking for confirmations on non-conflicting changes. (More # precisely, when the user interface is done setting the # propagation direction for one entry and is about to move to the # next, it will skip over all non-conflicting entries and go # directly to the next conflict.) auto=true # When this is set to true, the user interface will ask no # questions at all. Non-conflicting changes will be propagated; # conflicts will be skipped. batch=true # !When this is set to true, Unison will request an extra # confirmation if it appears that the entire replica has been # deleted, before propagating the change. If the batch flag is # also set, synchronization will be aborted. When the path # preference is used, the same confirmation will be requested for # top-level paths. (At the moment, this flag only affects the # text user interface.) See also the mountpoint preference. confirmbigdel=true # When this preference is set to true, Unison will use the # modification time and length of a file as a `pseudo inode # number' when scanning replicas for updates, instead of reading # the full contents of every file. Under Windows, this may cause # Unison to miss propagating an update if the modification time # and length of the file are both unchanged by the update. # However, Unison will never overwrite such an update with a # change from the other replica, since it always does a safe # check for updates just before propagating a change. Thus, it is # reasonable to use this switch under Windows most of the time # and occasionally run Unison once with fastcheck set to false, # if you are worried that Unison may have overlooked an update. # The default value of the preference is auto, which causes # Unison to use fast checking on Unix replicas (where it is safe) # and slow checking on Windows replicas. For backward # compatibility, yes, no, and default can be used in place of # true, false, and auto. See the section "Fast Checking" for more # information. fastcheck=true # When this flag is set to true, the group attributes of the # files are synchronized. Whether the group names or the group # identifiers are synchronizeddepends on the preference numerids. group=true # When this flag is set to true, the owner attributes of the # files are synchronized. Whether the owner names or the owner # identifiers are synchronizeddepends on the preference # extttnumerids. owner=true # Including the preference -prefer root causes Unison always to # resolve conflicts in favor of root, rather than asking for # guidance from the user. (The syntax of root is the same as for # the root preference, plus the special values newer and older.) # This preference is overridden by the preferpartial preference. # This preference should be used only if you are sure you know # what you are doing! prefer=newer # When this preference is set to true, the textual user interface # will print nothing at all, except in the case of errors. # Setting silent to true automatically sets the batch preference # to true. silent=true # When this flag is set to true, file modification times (but not # directory modtimes) are propagated. times=false

#          When this flag is set, Unison will log all changes to the filesystems on a file.

#          When this flag is set to true, groups and users are synchronized numerically, rather than by name.
#          The special uid 0 and the special group 0 are never mapped via user/group names even if this
#          preference is not set.

We want to automate synchronization, so we create a small script and create a cronjob on server1:

mkdir /root/scripts
vi /root/scripts/

and add the following content:


if [ ! -f /$lockdir/unison ]; then
        touch $lockdir/unison

        $UNISON -testserver web
        if [[ $rc != 0 ]] ; then
                echo "error"
                $LOGGER -d -t unison "web - error connecting remote"
                $UNISON web

        rm $lockdir/unison
        $LOGGER -d -t unison "unison already running"

make the script executable:

chmod 700 /root/scripts/

And run the first sync. To get some output during the sync set silent = false in /root/.unsion/web.prf. Afterwards, start unison:


Finally, we create the cronjob:

crontab -e
# unison
*  * * * *  /root/scripts/ > /dev/null
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