CODEWITHSUNDEEP
linuxunixubuntusshcentos
Vor
Vor

Reputation: 35129

How to performe command in multiple servers through ssh?

I'm trying to execute command on multiple servers through ssh, that's what I'm trying to do:

for i in {1..3}; do `ssh nginx_$i ps aux | grep logstash`; done

But it tells me to install some package:

The program 'root' is currently not installed. You can install it by typing:
sudo apt-get install root-system-bin

I'm not convinced that I need to install it, because if I do 

ssh nginx_1 ps aux | grep logstash

It works, and gives me the correct result.

P.S. Assuming that I have configured .ssh/config file to connect to nginx_1, nginx_2 and nginx_3.

Upvotes: 0

Views: 1273

Answers (2)

scai
scai

Reputation: 21469

Instead of the for loop you should use pssh.

Upvotes: 2

cnicutar
cnicutar

Reputation: 182649

for i in {1..3}; do `ssh nginx_$i ps aux | grep logstash`; done
                    ^                                   ^

Drop the backquotes. If you include them, the shell will try to execute the output of the command.

Upvotes: 4

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