I have 4 servers that I want to ping each other.
Expected execution of ping:
ping from 1 to 2, 3, and 4
ping from 2 to 1, 3, and 4
ping from 3 to 1, 2, and 4
ping from 4 to 1, 2, and 3
How to achieve this via a bash script?
User login is already configured with password-less to all 4 servers.
For monitoring such a small number of machines, I would use SmokePing instead of reinventing the wheel with a script.
It will provide a more visual feedback, average historic data over time and even a professional look and feel to show yet another service and good job done to others. People and PHBs love visual feedback for monitoring things.
In fact, I used it to monitor critical points of my infra-structuture in the past when I had a not-so-reliable satellite connection to the Internet.
The configuration is done in a small text file, and it is easy to add new IP addresses; it also has got a nice web interface. You just need to install a lightweight web server for it.
You can monitor pretty much anything than can be monitored via ICMP/pings; you can also monitor other critical equipment besides those 4 servers.
To have a feel how the interface works, see the smokeping interface for the outside world of an university
See also the example images:
After installing the web server and Smokeping, the actual configuration file can be as simple as this:
*** Targets ***
probe = FPing
menu = Top
title = Network Latency Grapher
remark = Welcome to this SmokePing website.
+ mysite1
menu = Site 1
title = Hosts in Site 1
++ myhost1
host = myhost1.mysite1.example
++ myhost2
host = myhost2.mysite1.example
+ mysite2
menu = Site 2
title = Hosts in Site 2
++ myhost3
host = myhost3.mysite2.example
++ myhost4
host = myhost4.mysite2.example
Just store the names in an array and iterate over it, using ssh to connect to each host and ping:
ips=("server1" "server2" "server3" "server4");
for((i=0;i<${#ips[@]};i++)); do
for((k=0;k<${#ips[@]};k++)); do
[[ $i -ne $k ]] && ssh "${ips[$i]}" ping -c1 "${ips[$k]}";
done
done
Do you have fping installed? It would probably make this easiest:
$ hosts="www smtp"
$ for host in $hosts ; do
echo "$host:";
ssh iv@$host "fping $hosts";
done
www:
www is alive
smtp is alive
smtp:
www is alive
smtp is alive
(I know, that's a lazy solution.)
It works perfectly for Your requirement
It will login server1 and ping only for server2 and server3 and viceversa
#!/bin/bash
while read line
do
ssh root@$line "sed "/$line/d" /root/p_final.txt |sed '/^$/d' | sed -r "s/\s+//g"|awk '{print $1}' | sed 's/^/ping -c2 /g'| sh" </dev/null
done </root/p_final.txt
where file p_final.txt contains the list of ip's one by one.Let me know for any doubts
ssh host1 ping -c 1 host2and it works without prompting for a password? In which case, surely your bash file is just one line after another asking host_x to ping host_y. If you want something more elegant, paramaterisable, efficient or extendable, then @RuiFRibeiro comment gives you the tools to achieve that. – EightBitTony Jan 11 '18 at 12:29