Transferring Data via SSH - notes to self

Notes re transferring Data via SSH

ssh -c arcfour

If using SSH (scp/sftp/rsync with ssh), you can achieve speed enhancements using "-c arcfour" (sacrificing a little security - might be ok in-house e.g.). See notes re SSH from Charles Martin Reid's wiki.

Example using rsync

rsync can sync entire directory structures but this script needed data positioned in a certain way. rsync can do loads and is a good starting point ...
This script could/should be rewritten to make more use of rsync features.


#!/bin/ksh


eval $@


PUBKEY=${HOME}/.ssh/mykey.pub
svrname=`uname -n | cut -c1-8`
srcdir=/mysrcdir
sftpUsr=remuser
prisftpserver=remsvr
remdir=/remdestdir


cd ${srcdir}


START_DAY=${START_DAY:-`date --date="1 days ago" +%Y%m%d`}
END_DAY=${END_DAY:-`date --date="1 days ago" +%Y%m%d`}


DAY=${START_DAY}
while [ $DAY -le $END_DAY ]
do


echo "Starting DAY=$DAY ..."


echo "`date +'%Y/%m/%d %H:%M:%S'`|Start|${DAY}"


# Try and create the directory - it may have already be created
ssh -i ${PUBKEY} -q ${sftpUsr}@${prisftpserver} "mkdir ${remdir}/${DAY}; chmod 777 ${remdir}/${DAY}"


# replace with the pattern matching the files you want rsync'd
rsync -av --rsync-path=/opt/sfw/bin/rsync --rsh="ssh -i ${PUBKEY}"   ${sftpUsr}@${prisftpserver}:${remdir}/${DAY}/${svrname}


echo "`date +'%Y/%m/%d %H:%M:%S'`|Complete|${DAY}"


DAY=$(($DAY+1))


done


Example not using rsync


#!/bin/ksh
# script built by several hence slightly different formatting stds used :(


eval $@


PUBKEY=${HOME}/.ssh/mykey.pub
svrname=`uname -n | cut -c1-8`   # local server
srcdir=/src_logs        # replace with location of source data files
sftpUsr=remuser          # replace with remote user
prisftpserver=remserver  # replace with remote server
remdir=/rem_logs         # replace with location of destination directory


cd ${srcdir}


# this example caters for daily logfiles
START_DAY=${START_DAY:-`date --date="1 days ago" +%Y%m%d`}
END_DAY=${END_DAY:-`date --date="1 days ago" +%Y%m%d`}


DAY=${START_DAY}
while [ $DAY -le $END_DAY ]
do


echo "Starting DAY=$DAY ..."


# Try and create the directory - it may have already be created
ssh -i ${PUBKEY} -q ${sftpUsr}@${prisftpserver} "mkdir ${remdir}/${DAY}; chmod 777 ${remdir}/${DAY}"


for filename in `ls -1 `  # replace
do


base_filename=`basename ${filename} .gz`
dir_filename=`dirname ${filename}`


scp_count=0
scp_error=1


while [ $scp_error -ne 0 ] && [ $scp_count -le 2 ] # give up after 3 scp attempts
do


scp_count=$(($scp_count+1))
echo "`date +'%Y/%m/%d %H:%M:%S'`|Started (${scp_count})|$filename|${base_filename}.gz"


# throttle speed to 1M with 120sec timeout to handle hanging scp's
scp -i ${PUBKEY} -l100000 -o ConnectTimeout=120 -q ${filename} ${sftpUsr}@${prisftpserver}:${remdir}/${DAY}/${svrname}_${dir_filename}_${base_filename}.gz
# use arcfour cipher which is faster but less secure with 120sec timeout to handle hanging scp's
#scp -i ${PUBKEY} -c arcfour -o ConnectTimeout=120 -q ${filename} ${sftpUsr}@${prisftpserver}:${remdir}/${DAY}/${svrname}_${dir_filename}_${base_filename}.gz
scp_error=$?


done

echo "`date +'%Y/%m/%d %H:%M:%S'`|Complete|${filename}|${base_filename}.gz"


done


DAY=$(($DAY+1))


done


Streaming data


Flume 
Scribe
Storm
S4


TBC