05-16-2006
This type of stuff seems to just keep coming back. People want to run scripts remotely. I've tried every way I can think of and this is the best way. You not only get functionality but you get security as well. Every Unix environment needs a way to issue shell scripts, perl script, SQL scripts to remote servers. I have posted the following example already but I will do it again. Everytime I go to a new company the first thing I do is build an issuance process. A way to issue script remotely outside of using some scheduler like Maestro or Control -m.
This is really a multi step process. You need to setup SSH correctly and create a key pair and passphrase. Then you need to load your keys into the SSH agent so that you don't get prompted for a passphrase. The SSH agent will handle passing your passphrase to the other systems.
Example:
#ssh-add
Adding identity: /home/tester/.ssh2/id_dsa_1024_defender.pub
Need passphrase for /home/tester/.ssh2/id_dsa_1024_defender.pub
(1024-bit dsa, tester@defender, Sun Apr 30 2000 21:39:13).
Enter passphrase:
#ssh server date
Wed May 10 14:06:57 EDT 2006
#
#Now that you have SSH setup. You can take any script and scp the script to the remote server.
Sample script below
###############################################
#!/bin/sh
LOG="/tmp/MYTEST.log
##################
function if_error
##################
{
if [[ $? -ne 0 ]]; then # check return code passed to function
print "$1 TIME:$TIME" | tee -a $LOG # if rc > 0 then print error msg and quit
exit $?
fi
}
chown root:root /etc/passwd
if_error "Failed chowning /etc/passwd to root:root"
chmod 700 /etc/passwd
if_error "Failed chmoding /etc/passwd to 700"
rm -rf /etc/somedir
if_error "Failed deleting /etc/somedir"
################################################
#Okay..So SSH is working and you got a little test script with the proper error checking in it. Also, I used the tee command to redirect the output of the script to the screen and to a log file in tmp.
scp $USER@$HOST:$PATH/$SCRIPT $USER@$HOST:/tmp/$SCRIPT
ssh -l $USER $HOST chmod 700 /tmp/$SCRIPT
ssh -l $USER $HOST /tmp/$SCRIPT
ssh -l $USER HOST rm /tmp/$SCRIPT
1. Copied script to server
2. Changed permissions
3. Executed script that will write to log file and screen cause I wrote it like that.
4. rm the script
Hope this is helpful.
-X
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RSH(1) General Commands Manual RSH(1)
NAME
rsh - remote shell
SYNOPSIS
rsh [-n] [-l username] host [command]
host [-n] [-l username] [command]
DESCRIPTION
Rsh connects to the specified host, and executes the specified command. Rsh copies its standard input to the remote command, the standard
output of the remote command to its standard output, and the standard error of the remote command to its standard error. Interrupt, quit
and terminate signals are propagated to the remote command; rsh normally terminates when the remote command does.
The remote username used is the same as your local username, unless you specify a different remote name with the -l option. This remote
name must be equivalent (in the sense of rlogin(1)) to the originating account; no provision is made for specifying a password with a com-
mand.
If you omit command, then instead of executing a single command, you will be logged in on the remote host using rlogin(1).
Shell metacharacters which are not quoted are interpreted on local machine, while quoted metacharacters are interpreted on the remote
machine. Thus the command
rsh otherhost cat remotefile >> localfile
appends the remote file remotefile to the localfile localfile, while
rsh otherhost cat remotefile ">>" otherremotefile
appends remotefile to otherremotefile.
OPTIONS
-l username
Specify the remote user name.
-n Connect standard input of the remote command to /dev/null. Do this if rsh should not inadvertently read from standard input.
SEE ALSO
rcp(1), rlogin(1), rhosts(5).
BUGS
You cannot run an interactive command (like rogue(6) or vi(1)); use rlogin(1).
4.2 Berkeley Distribution April 29, 1985 RSH(1)