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04 Jul 2013 Transfer files fast between servers using netcat and tar

This is a short post on how you can transfer files unsecured but fast between linux servers. I prefer to use netcat (nc) to transfer large amounts of data between servers when I know the connection between them are secure, ie on my private LAN.

The sender server should run the following command

$ tar cf - folder | netcat 192.168.0.1 9000

and the receiveing server should listen with with this command

$ netcat -l -p 9000 | tar x

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23 Jan 2009 Copy files using tar

This is a oneliner to copy files from current directory to another target directory using tar, preserving file attributes, dates etc.

#!/bin/sh

fromdir=/path/from
todir=/path/to/target

echo "cd $fromdir; tar cf - . | (cd $todir; tar xpf -)"

cd $fromdir; tar cf - . | (cd $todir; tar xpf -)

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01 Feb 2008 Cold backup for the Open Source Edition of Zimbra

Today I’ve setup a cold backup routine to backup my Zimba installation running on my Debian (Etch) 4.0 server that is in full production now for my private domains. This is a slightly modified backup script for the Open Source Edition of Zimbra from the Zimbra Wiki. Please note that the script does a full backup every time it’s being run!

#!/bin/bash

# Zimbra Backup Script
# Requires sftp to run
# This script is intended to run from the crontab as root
# Free to use and free of any warranty!  Daniel W. Martin, 9 Sept 2007

# Live sync before stopping Zimbra to minimize sync time with the services down
# Comment out the following line if you want to try single cold-sync only
rsync -avHK --delete /opt/zimbra/ /backup/zimbra

# which is the same as: /opt/zimbra /backup
# Including --delete option gets rid of files in the dest folder that don't exist at the src
# this prevents logfile/extraneous bloat from building up overtime.

# Stop Zimbra Services
sudo -u zimbra /opt/zimbra/bin/zmcontrol stop
sleep 40

# Sync to backup directory
rsync -avHK --delete /opt/zimbra/ /backup/zimbra

# Restart Zimbra Services
sudo -u zimbra /opt/zimbra/bin/zmcontrol start

# Create a txt file in the backup directory that'll contain the current Zimbra
# server version. Handy for knowing what version of Zimbra a backup can be restored to.
sudo -u zimbra zmcontrol -v > /backup/zimbra/conf/zimbra_version.txt
# or examine your /opt/zimbra/.install_history

# Create archive of backed-up directory for offsite transfer
# cd /backup/zimbra
ZimbraVersion=zimbraBackup-zcs-5.0.1_GA_1902.DEBIAN4.0.20080109200914

tar -zcf /backup/$ZimbraVersion-$(date +"%Y-%m-%d").tgz -C /backup/zimbra .

# Transfer file to backup server using passwordless sftp
scp zimbraBackup-zcs-5.0.1_GA_1902.DEBIAN4.0.20080109200914-$(date +"%Y-%m-%d").tgz username@example.com:/path/to/backupfolder/

I’ve described passwordless ssh/sftp session in a earlier post so I won’t describe the last line of the backup script.

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18 May 2007 Transfer directories between computers using SSH and tar

When I need to transfer lots of files or directories between computers, I usually use tar and ssh together. Last time I used it however, I realized that perhaps not everyone knows how to do this. The procedure is very simple, and a full command could look something like this:

tar -cf - directory/ | ssh my.other.computer tar -xf - -C /destination/

If you want compression, just add z for gzip or j for bzip2 to both tar statements. This could be necessary if you are planning to do this over slow lines.

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07 May 2007 Piping binary data to a remote shell via ssh

tar -czpf  - source_dir --exclude=/proc --exclude=/mnt | ssh user@desktop 'cat > /path/to/target/dest.tar.gz'

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