SSH - Parallel SSH

In general it is possible to say that in case that you’ll need to run a remote command on several SSH Servers Parallel SSH is the right application that can help you. In fact you write a script that will take list of your servers and run this command on all this server. On another hand you use Parallel SSH application and save your time.

Go to “ http://code.google.com/p/parallel-ssh/ ” and download last release

[root@SSH_Client pssh]# wget http://parallel-ssh.googlecode.com/files/pssh-2.3.1.tar.gz
[root@SSH_Client pssh]# tar -vxzf pssh-2.3.1.tar.gz
[root@SSH_Client pssh]# cp -r ./pssh-2.3.1 /opt/

[root@SSH_Client ~]# ls /opt/pssh-2.3.1/bin/
pnuke  prsync  pscp  pslurp  pssh  pssh-askpass

Description: “ host[:port] [user] ”

To use Parallel SSH we need to create a list of SSH Servers. It is possible to create several list of servers. According to this it is possible to group servers based for example on Linux/UX version. For example in the case that you would like to get the information about file system utilization you need to run “ df “ command on Linux servers and “ bdf “ command on HP-UX servers. According to this it is really handy to split list of servers to more as one configuration file to run right command on right server.

[user@SSH_Client ~]$ cat destinatio_servers.list
SSH_Server1:22 user
SSH_Server2:22 user
[user@SSH_Client ~]#

[user@SSH_Client ~]$ /opt/pssh-2.3.1/bin/pssh -A -h ./destinatio_servers.list -o /tmp/result "uname -a"     # Run command on list of SSH Server
Warning: do not enter your password if anyone else has superuser
privileges or access to your account.
Password:                                                                                                   # -A will ask you for password
[1] 18:36:38 [SUCCESS] user@SSH_Server1:22
[2] 18:36:38 [SUCCESS] user@SSH_Server2:22

[user@SSH_Client ~]$ cd /tmp/result                                                                         # -o = output directory
[user@SSH_Client result]$ ls
user@SSH_Server1:22 user@SSH_Server2:22                                                                     # list of files with command result

[User@SSH_Client result]$ cat /tmp/result/*                                                                 # Command results
Linux SSH_Server1 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
Linux SSH_Server2 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

[user@SSH_Client ~]$ /opt/pssh-2.3.1/bin/pscp  -A -h ./destinatio_servers.list source_file /tmp/destination  # Copy from SSH Client to SSH Servers
Warning: do not enter your password if anyone else has superuser
privileges or access to your account.
Password:                                                                                                    # -A will ask you for password
[1] 19:05:35 [SUCCESS] user@SSH_Server1:22
[2] 19:05:35 [SUCCESS] user@SSH_Server2:22

[user@SSH_Client ~]$ /opt/pssh-2.3.1/bin/pslurp  -A -h ./destinatio_servers.list -L /tmp/result/ ~/.ssh/known_hosts downloaded.file
Warning: do not enter your password if anyone else has superuser
privileges or access to your account.
Password:
[1] 19:12:43 [SUCCESS] user@SSH_Server1:22
[2] 19:12:43 [SUCCESS] user@SSH_Server2:22

[user@SSH_Client ~]$ ll -R /tmp/result/
/tmp/result/:
total 8
drwxr-xr-x. 2 user user 4096 Feb  3 19:12 SSH_Server1
drwxr-xr-x. 2 user user 4096 Feb  3 19:12 SSH_Server2

/tmp/result/SSH_Server1:
total 4
-rw-r--r--. 1 user user 1182 Feb  3 19:12 downloaded.file

/tmp/result/SSH_Server2:
total 4
-rw-r--r--. 1 user user 393 Feb  3 19:12 downloaded.file

Home page: http://code.google.com/p/parallel-ssh/
Download: http://code.google.com/p/parallel-ssh/downloads/list