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How To's Tutorials

Manage Multiple SSH Sessions using ClusterSSH(cssh) on Linux

 

Overview :

 

ClusterSSH(cssh) is a cluster administration tool,it is used to make the same change on  multiple linux  servers at the same time. ClusterSSH(cssh)  controls a number of xterm windows via a single graphical console window to allow commands to be interactively run on multiple linux servers over an ssh or rsh connection.


Cssh command opens an administration console and an xterm to all specified hosts. Any text typed into the administration console is replicated to all windows. All windows may also be typed into directly.

 

Installation of ClusterSSH on Ubuntu

 

# sudo apt-get install clusterssh

 

Installation of ClusterSSH on CentOS/RHEL/Fedora

 

To install ClusterSSH on CentOS/RHEL/Fedora, first  set up EPEL repository, and then run the below Command :

 

# yum install clusterssh

 

After installation, define the  cluster of hosts that we want to run commands on. To do this, create a system-wide ClusterSSH configuration file as follows.

 

# sudo vi /etc/clusters

 

 

If we want a user-specific ClusterSSH configuration, simply use ~/.csshrc instead of /etc/clusters. In the above example , I define two clusters: nsit_cluster1 , nsit_cluster2 along with hosts.

 

Example:1  To launch ClusterSSH, run cssh command as follows.

 

# cssh  -l  root   nsit_cluster1

 

In the above command , 'root' is the login ID for all the hosts in the cluster, and 'nsit_cluster1' is the cluster name.

 

 

Example:2 Individual hostnames instead of the cluster name.

 

#  cssh -l root mail1.nsitmail.com mail2.nsitmail.com mail3.nsitmail.com

 

In Above command just replace hostname according to your environment.

 

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