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Top Forums UNIX for Advanced & Expert Users stagger ssh command to multiple machines Post 302290844 by msullivan on Tuesday 24th of February 2009 06:45:42 AM
Old 02-24-2009
stagger ssh command to multiple machines

Good day,

I am extracting information from Apache log files from 41 servers. Every day I have 7 cronjobs scheduled to do this for me and it works beautifully Smilie... only problem is that it takes about 6-9 hours to run through, as the script runs about 6 ssh commands for each box then goes to the next one.

I am sitting in the development environment and can only ssh in as readonly on the servers, which all sit in prodcution environment. I am not allowed to do anything on the production environment, so ssh is my only option for this one.

Here is a breakdown of my script structure
#!/usr/bin/ksh

ssh_function1()
}
Error_HTTP_403_cre()
{
if `test -f $sshExportFile`; then rm $sshExportFile ; else touch $sshExportFile ; fi
ErrorDesc="HTTP/1.1 403"
ssh readonly@$ServerIP 'YEAR=xx;DAY=xx;MONTH=xx;LMONTH=xx;for i in 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 \
16 17 18 19 20 21 22 23; grep -c "HTTP/1.1\" \"403" "/var/SP/log/apache/cre/access.log_$YEAR$MONTH$DAY_"*$i.gz ;done'>>$sshExportFile (Export file on dev box)
Sum_to_Oracle #Oracle insert function
echo "$ErrorDesc: $Value" >> $EFCREE
rm $sshExportFile
}

sshfunction()
{
ssh_function1 ; ssh_function2 ; ssh_function3 ; ssh_function#....
}

Servername="A"; serverip=1.1.1.1 ; sshfunction
Servername="B"; serverip=1.1.1.2 ; sshfunction
Servername="B"; serverip=1.1.1.3 ; sshfunction
#... and some more servers

The same commands run on all the servers.

Is there a way I can run the commands that after 5 minutes the script starts with the next server, while still running the sshfunction for the previous servers..Smilie

so... time=0
Servername="A"; serverip=1.1.1.1 ; sshfunction #kicks off and runs till finished
time=0+5
Servername="B"; serverip=1.1.1.2 ; sshfunction #kicks off and runs till finished
.. and so on and so forth.

Thanks in advance
msullivan
 

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SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine (presumably using a login password, so password authentication should be enabled, unless you've done some clever use of multiple identities) It also changes the permissions of the remote user's home, ~/.ssh, and ~/.ssh/authorized_keys to remove group writability (which would oth- erwise prevent you from logging in, if the remote sshd has StrictModes set in its configuration). If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary) SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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