Poor Man’s Ghost / Clone Over the Network

Introduction

Assuming System Rescue CD

Destination System Listens

netstat -lntupe | grep 1515
iptables -I INPUT -p tcp --dport 1515 -j ACCEPT
iptables -L -n
netcat -l -p 1515 | gzip -d | dd bs=16M of=azat.sda.raw.gz
#netcat -l -p 1515 | gzip -d > azat.sda.raw.gz

Note -I not -A

Source System Talks

passwd
#/etc/init.d/sshd restart

ping -c1 REMOTE_ADDRESS
ssh REMOTE_ADDRESS -l root

screen -S dd
nmap -sU -p 1515 BKPSRV_IP
time dd bs=16M if=/dev/sda status=progress | gzip -1 -c | nc BKPSRV_IP 1515
#time gzip -1 -c /dev/sda | nc BKPSRV_IP 1515

Bandwidth Test & Performance

For overall throughput see http://doc.nethence.com/network/iperf

With dd bs=16M we get about 5.5 to 6MB/s. While with netcat stdin and stdout we get about 6680 KB/s, which does not make a big difference. For a disk size of 250GB, it will take about $((250000 / 6)) namely 41666 seconds to clone, 694 minutes, 57 hours.

Resources

• http://www.system-rescue-cd.org/manual/Network_configuration_and_programs/

Clone Over Network

• https://www.ndchost.com/wiki/server-administration/netcat-over-ssh
• https://www.cyberciti.biz/tips/howto-copy-compressed-drive-image-over-network.html
• https://superuser.com/questions/20307/good-free-way-to-clone-a-hard-drive-or-a-partition-and-send-the-image-over-the-n
• https://superuser.com/questions/1279671/clone-disk-over-network
• https://unix.stackexchange.com/questions/132797/how-to-dd-a-remote-disk-using-ssh-on-local-machine-and-save-to-a-local-disk
• search dd disk through network ftp
• http://www.barryhubbard.com/linux/ghost-hard-drive-to-an-ftp-server/

trash

• over ssh https://www.linode.com/docs/platform/disk-images/copying-a-disk-image-over-ssh/
• over ssh https://www.pantz.org/software/dd/drivecopywithsshanddd.html