CODEWITHSUNDEEP
bashping
Lurch
Lurch

Reputation: 875

ping multiple ips in parallel using fping

I have the below simple ping monitor script

#!/bin/bash
while true; do
    HOST=8.8.8.8
    HOST2=8.8.4.4
    
    if [[ "$(fping -I -r 1 $HOST | awk '{print $3}' )" = "alive" ]]; then
        
        sleep 1
        echo "Internet is UP" 
        
    else
        
        if [[ "$(fping -r 1 $HOST2 | awk '{print $3}' )" != "alive" ]]; then
            
            sleep 1
            echo "Internet is Down" 
        fi
    fi
done

What i'd like to do is to be able to ping in parallel and incorporate into my above script i.e.

fping -a -A -c 1 8.8.8.8 8.8.4.4 1.1.1.1

And at least one works then "internet is up" but if all fail "internet is down"

Upvotes: 1

Views: 91

Answers (2)

Wiimm
Wiimm

Reputation: 3572

Try this:

while true; do
    if fping -r1 $HOST $HOST2 | grep -q alive; then
        sleep 1
        echo "Internet is UP" 
    else
        sleep 1
        echo "Internet is Down" 
    fi
done

Alternatively you can set

hosts=( 8.8.8.8 8.8.4.4 )

... with any number of ip addresses and use ...

if fping -r1 "${hosts[@]}" | grep -q alive; then

Upvotes: 1

markp-fuso
markp-fuso

Reputation: 35256

Start by storing the ip/host addresses in an array:

hosts=( 8.8.8.8 8.8.4.4 1.1.1.1 91.91.91.91)

Feeding the array to the fping call:

$ fping -r1 "${hosts[@]}"
8.8.8.8 is alive
8.8.4.4 is alive
1.1.1.1 is alive
91.91.91.91 is unreachable

fping + grep to determine current status:

status=Down
fping -r1 "${hosts[@]}" | grep -q alive && status=UP
echo "Internet is ${status}"

Taking for a test drive:

With hosts=( 8.8.8.8 8.8.4.4 1.1.1.1 91.91.91.91 ) this generates:

Internet is UP

With hosts=( 91.91.91.91 ) this generates:

Internet is Down

If we negate the conditional we can loop while the internet is down (no need for the status variable in this case):

while ! fping -r1 "${hosts[@]}" | grep -q alive
do
    echo "Internet is Down"
    sleep 1
done

echo "Internet is UP"

NOTES:

  • OP will need to decide how they wish to handle any stderr messages generated by the fping call
  • while OP has mentioned the desire to run the fping calls in parallel they also said they wish to run fping -a -A -c 1 8.8.8.8 8.8.4.4 1.1.1.1 (I take this to imply the need to handle a variable number of ip/host addresses) ...
  • I have no idea how fping handles multiple addresses - does it run them in parallel or serially? - so if OP is looking for even more parallel capability then it may be necessary to bring xargs or parallel into the mix

Upvotes: 2

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