Listing of file: getdog.sh

L. J. Jaeckel
CMPSC 210 — Linux System Administration
April 21, 2011

Listing of file: getdog.sh

This script, residing on the debian5vm Final Exam virtual machine, downloads an entire copy of the ~jeremy web site from the csrh1 machine (which, in turn, should contain a copy of the same from the SDF freeshell machine).

The overall theory of operation is:

The files are downloaded from sdf.org:~doggie/html to csrh1 periodically, as needed. This is done by manually running the getsdf.sh script on the csrh1 machine. (View transcript of that.) Note that this downloads the entire collection of files, using zip/sftp/unzip because rsync is not available on the sdf machine. Note also that this is done manually because I could not get it to run as a cron task. It's probably just as well to do this manually only as needed anyway.
When the debian5vm virtual machine is running and on-network, it runs this getdog.sh script periodically as a cron task. This uses rsync to download from csrh1 only those files (or pieces of files) that have changed, into a local directory on debian5vm. Then the entire collection of files is copied from there to the ~jeremy/public_html directory for your viewing pleasure.
Public/private key authentication is used, so the process may be automated (as a cron task) without manual intervention needed to enter a password.

Click here to view the transcript of the latest rsync download. (Viewable on debian5vm machine only.)

     1	#!/bin/bash
     2	# getdog.sh
     3	# L. J. Jaeckel  -- April 21, 2011
     4	
     5	# Run rsync to pull entire directory of web site files from
     6	# jaeckell@csrh1.yosemite.edu:/home/jaeckell/Dogweb to
     7	# local directory /home/jeremy/Testweb.
     8	# Then copy all the files from there into ~jeremy/public_html
     9	#
    10	# This runs with public key authentication, and so can be run
    11	# automatically as a cron, without need for manual password entry.
    12	
    13	REMOTE_USER=jaeckell
    14	REMOTE_MACH=csrh1.yosemite.edu
    15	# Note, remote directory name includes / at the end.
    16	# We discovered that this is necessary to make it work right.
    17	REMOTE_DIR=/home/jaeckell/Dogweb/
    18	
    19	LOCAL_HOME=/home/jeremy
    20	LOCAL_DIR=$LOCAL_HOME/Testweb
    21	LOCAL_HTML=$LOCAL_HOME/public_html
    22	LOCAL_KEY=$LOCAL_HOME/cron/debian5vm-rsync-key
    23	
    24	cd $LOCAL_HOME
    25	echo '<html><head><title>Doggie download on' `date` '</title></head>'
    26	echo '<body><h2>Doggie web site download started on:' `date` '</h2>'
    27	
    28	echo "<h3>Downloading modified files from $REMOTE_MACH"
    29	echo "to local directory $LOCAL_DIR</h3>"
    30	echo '<pre>'
    31	
    32	echo rsync -arvz -e "\"ssh -i $LOCAL_KEY\"" $REMOTE_USER@$REMOTE_MACH:$REMOTE_DIR $LOCAL_DIR
    33	rsync -arvz -e "ssh -i $LOCAL_KEY" $REMOTE_USER@$REMOTE_MACH:$REMOTE_DIR $LOCAL_DIR
    34	
    35	echo '</pre>'
    36	echo "<h3>Copying entire web file collection from local $LOCAL_DIR<br />"
    37	echo "to local web site directory $LOCAL_HTML</h3>"
    38	echo '<pre>'
    39	
    40	cd $LOCAL_DIR
    41	cp -f -v -r * $LOCAL_HTML
    42	cd $LOCAL_HOME
    43	
    44	echo '</pre>'
    45	echo '<h2>Doggie web site download completed on: ' `date` '</h2><hr /></body></html>'
    46	
    47