Question

I want to modify my script in such a way it can monitor my cpu, memory and ram on 4 servers on my network, the script below is a script that can monitor for one server, is there a way i can check or modify my script below if i have the hosts and username and password.

printf "Memory\t\tDisk\t\tCPU\n"
end=$((SECONDS+3600))
while [ $SECONDS -lt $end ]; do
MEMORY=$(free -m | awk 'NR==2{printf "%.2f%%\t\t", $3*100/$2 }')
DISK=$(df -h | awk '$NF=="/"{printf "%s\t\t", $4}')
CPU=$(top -bn1 | grep load | awk '{printf "%.2f%%\t\t\n", $(NF-2)}')
echo "$MEMORY$DISK$CPU"
sleep 5
done

any ideas or suggestions?

Answer 1

A simple, naive implementation might look like:

for server in host1 host2 host3 host4; do
  ssh "$server" bash -s <<'EOF'
...your script here...
EOF
done

...with RSA keys preconfigured for passwordless authentication. That could be made slightly less naive by leveraging ControlMaster/ControlSocket functionality in ssh, so you're keeping the same transport up between multiple ssh sessions and reusing it wherever possible.

However -- rolling your own system monitoring tools is a fool's errand, at least until you've been around the block with the existing established ones, know their strengths, know their weaknesses, and can make a reasoned argument as to why they aren't a good fit for you. Use something off-the-shelf maintained by people who've been doing this for a while.

Monitoring multiple Linux Systems or Servers Script

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