Mass ssh connection..

Quote:

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Originally Posted by kapuera

Hi again,
Paralel connection is not must. I have too many time, operation can take a long time, it's not problem.
I will give a time out to ssh, 10 seconds timeout is a reason to next host.
Textfile contains hosts, i will not create it. It's already created.
Host don't need to restart.

I will start a command on ssh with a ssh parameter. For example; i 'll create a text file on remote host. It's not complex operation.

I only need to know how to give ip address to ssh command from a text file using shell script.

It's important for me.

Thanx for your helps.

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How about this, from a bash prompt:

cat filewithIPs | while read host
do
ssh root@$host <command>
sleep 10
done

That will process each host/IP one at a time from the prompt, doing whatever it is you need to do to each host with ssh.

Quote:

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Originally Posted by ped

How about this, from a bash prompt:

cat filewithIPs | while read host
do
ssh root@$host <command>
sleep 10
done

That will process each host/IP one at a time from the prompt, doing whatever it is you need to do to each host with ssh.

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The problem with using 'shell' – ie bash to connect to a remote server is that it can not return back to the shell. So the example that Ped gave you wont work because the remote host is waiting for a return (\r) character or a line feed (\n) character. The concept is perfect but it will not work using shell.

There are a number of ways of dong this. PERL is one way but its quite a task to 'interact'. The very best way which is easy to understand is tcl/expect. This was written by a guy called Don Libes for exactly the same type of task that you want to achieve – ie where you need to interact.

If you are able to install 'tcl/expect 'on your system and you want to use this approach, then I can give you the information/examples that will perform your tasks.

Quote:

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Originally Posted by kingn

The problem with using 'shell' – ie bash to connect to a remote server is that it can not return back to the shell. So the example that Ped gave you wont work because the remote host is waiting for a return (\r) character or a line feed (\n) character. The concept is perfect but it will not work using shell.

There are a number of ways of dong this. PERL is one way but its quite a task to 'interact'. The very best way which is easy to understand is tcl/expect. This was written by a guy called Don Libes for exactly the same type of task that you want to achieve – ie where you need to interact.

If you are able to install 'tcl/expect 'on your system and you want to use this approach, then I can give you the information/examples that will perform your tasks.

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Hi Again - Well I have just checked out pssh myself and I think its worth a look.

I think mine may work, with a slight modification.

cat filewithIPs | while read host
do
ssh root@$host <<-EOF
commands to execute on remote host go here...
exit
EOF
sleep 10
done

In fact, I just tested it locally on my system and it worked.

Quote:

---

Originally Posted by kapuera

Hi to all,
I need to make an mass-ssh connection.
I mean that;
I have a text file that thousand IP addresses. I need to make ssh connection to this ip address one by one. I will create a text file each ssh server.

Thanx for your help.

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You might want to look at "clusterssh" see SourceForge.net: clusterssh

Quote:

---

Originally Posted by ped

I think mine may work, with a slight modification.

cat filewithIPs | while read host
do
ssh root@$host <<-EOF
commands to execute on remote host go here...
exit
EOF
sleep 10
done

In fact, I just tested it locally on my system and it worked.

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Hi Ped - Ahh yes, your right, that will work. I had not thought of of that method. To do a simple ssh to any number of host this is a cleaver way - good thinking :-) Nick

Thanks, Nick... :-)

#/bin/sh

declare the variables for your task
like:

HOST_FILE=<path to the host file>

for H in $(cat $HOST_FILE)
do
ping -c1 -t1 $H 2>&!
TEST=$?

if [ $TEST = 0 ]; then
ssh $H "execute teh command to perform your task"
fi
done