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How to run ssh command across multiple servers?
A little more direct is to use the -n flag, which tells ssh not to read from standard input. It’s not parallel ssh but it works. I open-sourced a command line tool called Overcast to make this sort of thing easier. Once that’s done you can run commands across them using wildcards, like so:
How can I Make my bash script run for all servers?
My loop runs just once when I run the SSH command, however, for SCP it runs for all servers in the text file and exits, I want the loop to run till the end of text file for SSH. Following is my bash script, how can I make it run for all the servers in the text file while doing SSH?
How to make SSH not read from standard input?
A little more direct is to use the -n flag, which tells ssh not to read from standard input. It’s not parallel ssh but it works. I open-sourced a command line tool called Overcast to make this sort of thing easier.
How to stop SSH from reading from stdin?
The problem with this code is that ssh starts reading data from stdin, which you intended for read line. You can tell ssh to read from something else instead, like /dev/null, to avoid eating all the other hostnames. A little more direct is to use the -n flag, which tells ssh not to read from standard input.
When to use SSH to execute Linux command?
This is quite a common task for Linux system administrators, when it is needed to execute some command or a local Bash script from a one Linux workstation or a server on another remote Linux machine over SSH.
Is there a way to run SSH in parallel?
To achieve, this you can use the pssh (parallel ssh) program, a command line utility for executing ssh in parallel on a number of hosts. With it, you can send input to all of the ssh processes, from a shell script. You must be using SSH passwordless authentication for all remote servers.
How to run bash script on a remote server?
SSH: Run Bash Script on Remote Server. The equally common situation, when there is some Bash script on a Linux machine and it needs to connect from it over SSH to another Linux machine and run this script there.
Although it’s not really clear what you’re asking for. There is a project called parallel SSH which provides parallel versions of ssh, scp and rsync. So the advantage is that you don’t need to do any shell script you just provide it the list of servers to run the command on and it’ll do it in parallel.
How to loop through a list of servers?
I regularly do things where I loop through a list of servers to take some action. For example: I’m wondering (from a shell perspective) if there’s an easier way of doing this than cat servers.txt My quick and dirty… where servers.txt has a series of hosts or IPs, one-per-line. I use ClusterSSH.
What can I use instead of shell for loop?
As do puppet and chef. clusterssh, parallel ssh and dancer shell are small simple improvements over a shell for loop. They don’t need more infrastructure. But there’s also ansible, which let’s you do that, but also write reusable “playbooks” with several steps.