Running a Command on Multiple servers using Free Fanout Utility
Fanout is a nifty tool for sysadmins to quickly run a set of commands on multiple servers:
It runs non-interactive commands (like dd, cat, adduser, uname -a, etc.) and pipelines built of these. The output is collected into a single display that can be viewed by less or redirected to a file
You can group servers under a variable & run commands like below:
PROD_SERVERS=S1 S2 S3 S4 ./fanout "$PROD_SERVERS" "uname -a"
this will run command on all servers S1-S4 and show consolidated output on screen
You can as many combinations of complex commands as you want:
example:
fanout “$SERVERS” “uname -a ; ( if [ -f /var/log/dmesg ]; then cat /var/log/dmesg ; else dmesg ; fi ) | egrep -i ‘(hd[a-h]|sd[a-h])’ ; ls -al /proc/kcore ; cat /proc/cpuinfo” >serverspecs
Pre-Requisites for smoother operation
- Setup ssh-keys between hosts so that u do not need to key in your password each time, there will be no point of using this tool if you do not have ssh-keys setup between hosts
- You need to run this from the main jump server where u created your private key, also public key of corresponding private key should be added under ~/.ssh/authorized_keys file on all other hosts.
Above steps are 1 time efforts only, once done you can run as many commands you want to get desired results from multiple servers in single command.
Source: http://www.stearns.org/fanout/filelist.html
Direct Download Link: http://www.stearns.org/fanout/fanout
PS: It is just a shell script not a binary.
