Automatic rsync restart when dynamic IP changes

joma · 03-26-2006, 04:43 AM

I want to synchronize a remote server to my own local one.
I have an ADSL with dynamic IP connection (12 hours changes)
How can I automatically restart rsync if IP changes while running this task?

acid_kewpie · 03-26-2006, 08:43 AM

just a cron job to take care of it if there is nothing better there monitoring this...

Code:

#!/bin/bash
CURRENT_IP=$(/sbin/ifconfig eth0 | grep inet\ addr | cut -d: -f 2 | cut -d\  -f 1)
if [ "$CURRENT_IP" != "$(cat /tmp/current_ip)" ]
then 
  do_rsync_restart
  echo $CURRENT_IP > /tmp/current_ip
fi

just run something like that every minute, 5 minutes, hour or whatever you want.

joma · 04-18-2006, 02:57 AM

well,I still haven't solved the problem.
My rsync command from console is the following:
rsync -avz --include=kde-i18n-it-* --include=kde-i18n-en_GB-* --include=kde-i18n-de-* --include=koffice-l10n-it-* --include=koffice-l10n-de-* --include=koffice-l10n-en_GB-* --exclude=source/ --exclude=kdei/kde-i18n-* --exclude=kdei/koffice-l10n-* --delete --delete-after --delete-excluded --progress rsync://rsync.slackware.at/slackware/slackware-current /mnt/hda10/slackware/

When the IP-address changes (for example: xxx.2.68.158 to xxx.2.68.20)
I need to close the console, start a new one ,become superuser (root) and give again the rsync command.
The current IP I can gat with the following line

/sbin/ifconfig ppp0 | grep "inet addr"| cut -d':' -f2 | cut -d' ' -f1

now how can I create the /tmp/current_ip
create the cron job to verify it
and if it is necessary kill the rsync job and restart it again?
thanks in advance

PDock · 04-18-2006, 05:56 AM

Ok for the posted script to work you first need an existing current_ip file. Try

Code:

/sbin/ifconfig ppp0 | grep "inet addr"| cut -d':' -f2 | cut -d' ' -f1 > /tmp/current_ip

Of course once your copy of slackware-current mirrors the source server the time rsync needs to check for changes should be well under 12 hours.

mdarby · 04-18-2006, 05:57 AM

Create a bash script. In a new file (let's call it "/root/scripts/rsync_kde.sh") enter:

Code:

#!/bin/bash

$curr_ip=`/sbin/ifconfig ppp0 | grep "inet addr"| cut -d':' -f2 | cut -d' ' -f1`
$old_ip=`cat /tmp/curr_ip`

if["$curr_ip" -ne "$old_ip"]; then
  /usr/bin/rsync -avz --include=kde-i18n-it-* --include=kde-i18n-en_GB-* --include=kde-i18n-de-* --include=koffice-l10n-it-* --include=koffice-l10n-de-* --include=koffice-l10n-en_GB-* --exclude=source/ --exclude=kdei/kde-i18n-* --exclude=kdei/koffice-l10n-* --delete --delete-after --delete-excluded --progress rsync://rsync.slackware.at/slackware/slackware-current /mnt/hda10/slackware/
  echo $curr_ip > /tmp/curr_ip
fi

Now you have to chmod to 700:

Code:

chmod 700 /root/scripts/rsync_kde.sh

In root's crontab file enter a line like this:

Code:

*/2  0 * * * /root/scripts/rsync_kde.sh

joma · 04-19-2006, 04:42 AM

at the moment I get this error

root/scripts/rsync_kde.sh: line 6: if[xxx.2.68.168 -ne xxx.2.68.168]: command not found

mdarby · 04-19-2006, 05:50 AM

I've updated the original post.