CODEWITHSUNDEEP
linuxbashshellunixping
David542
David542

Reputation: 110163

How to check if a server is running

I want to use ping to check to see if a server is up. How would I do the following:

ping $URL
if [$? -eq 0]; then
    echo "server live"
else
    echo "server down"
fi

How would I accomplish the above? Also, how would I make it such that it returns 0 upon the first ping response, or returns an error if the first ten pings fail? Or, would there be a better way to accomplish what I am trying to do above?

Upvotes: 9

Views: 98103

Answers (6)

derHugo
derHugo

Reputation: 90659

I'ld recommend not to use only ping. It can check if a server is online in general but you can not check a specific service on that server.

Better use these alternatives:

curl

man curl

You can use curl and check the http_response for a webservice like this

check=$(curl -s -w "%{http_code}\n" -L "${HOST}${PORT}/" -o /dev/null)
if [[ $check == 200 || $check == 403 ]]
then
    # Service is online
    echo "Service is online"
    exit 0
else
    # Service is offline or not working correctly
    echo "Service is offline or not working correctly"
    exit 1
fi

where

  • HOST = [ip or dns-name of your host]

  • (optional )PORT = [optional a port; don't forget to start with :]

  • 200 is the normal success http_response

  • 403 is a redirect e.g. maybe to a login page so also accetable and most probably means the service runs correctly

  • -s Silent or quiet mode.

  • -L Defines the Location

  • -w In which format you want to display the response
    -> %{http_code}\n we only want the http_code

  • -o the output file
    -> /dev/null redirect any output to /dev/null so it isn't written to stdout or the check variable. Usually you would get the complete html source code before the http_response so you have to silence this, too.

nc

man nc

While curl to me seems the best option for Webservices since it is really checking if the service's webpage works correctly,

nc can be used to rapidly check only if a specific port on the target is reachable (and assume this also applies to the service).

Advantage here is the settable timeout of e.g. 1 second while curl might take a bit longer to fail, and of course you can check also services which are not a webpage like port 22 for SSH.

nc -4 -d -z -w 1 ${HOST} ${PORT} &> /dev/null
if [[ $? == 0 ]]
then
    # Port is reached
    echo "Service is online!"
    exit 0
else
    # Port is unreachable
    echo "Service is offline!"
    exit 1
fi

where

  • HOST = [ip or dns-name of your host]

  • PORT = [NOT optional the port]

  • -4 force IPv4 (or -6 for IPv6)

  • -d Do not attempt to read from stdin

  • -z Only listen, don't send data

  • -w timeout
    If a connection and stdin are idle for more than timeout seconds, then the connection is silently closed. (In this case nc will exit 1 -> failure.)

  • (optional) -n If you only use an IP: Do not do any DNS or service lookups on any specified addresses, hostnames or ports.

  • &> /dev/null Don't print out any output of the command

Upvotes: 15

kevoroid
kevoroid

Reputation: 5302

One good solution is to use MRTG (a simple graphing tool for *NIX) with ping-probe script. look it up on Google.

read this for start.

Sample Graph:

Sample Graph

Upvotes: 2

voji
voji

Reputation: 493

I using the following script function to check servers are online or not. It's useful when you want to check multiple servers. The function hide the ping output, and you can handle separately the server live or server down case.

#!/bin/bash

#retry count of ping request
RETRYCOUNT=1;

#pingServer: implement ping server functionality. 
#Param1: server hostname to ping
function pingServer {
  #echo Checking server: $1
  ping -c $RETRYCOUNT $1 > /dev/null 2>&1
  if [ $? -ne 0 ]
  then
    echo $1 down
  else
    echo $1 live
  fi
}

#usage example, pinging some host
pingServer google.com
pingServer server1

Upvotes: 4

hudolejev
hudolejev

Reputation: 6018

Short form:

ping -c5 $SERVER || echo 'Server down'

Do you need it for some other script? Or are trying to hack some simple monitoring tool? In this case, you may want to take a look at Pingdom: https://www.pingdom.com/.

Upvotes: 6

devang
devang

Reputation: 5516

You can use something like this -

serverResponse=`wget --server-response --max-redirect=0 ${URL} 2>&1`

if [[ $serverResponse == *"Connection refused"* ]]
then
    echo "Unable to reach given URL"
    exit 1
fi

Upvotes: 10

A human being
A human being

Reputation: 1220

Use the -c option with ping, it'll ping the URL only given number of times or until timeout 

if ping -c 10 $URL; then
    echo "server live"
else
    echo "server down"
fi

Upvotes: 8

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