Exit the script when all servers are down


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# 1  
Exit the script when all servers are down

Hello All,

I have a script which needs to exit once it encounters that all the servers are down. In the below portion of a code the content manager is having values of server for example server A , server B. So I want the script to exit only if all the servers are down and to continue if one any one of them got failed but the other is fine.


Code:
for server in $content_manager
        do
        ssh cognos@"$server"m 'ls && exit'
        done
        if (($? > 0))
        then
       echo "Content Manager server is Down"
       exit
        fi

# 2  
Code:
cnt=0;
while [ $cnt -eq 0 ]
do
    for server in $content_manager
    do
        ping "$server"m || cnt=$(( $cnt + 1 ))   # I assume "$server"m resolves to a valid host name.....
   done
   if [ $cnt -eq 0 ] ; then        
       echo "Content Manager server is Down"
       exit
    fi
    sleep 1  # do not busy wait.
    cnt=0   # start counting over again
done

# 3  
Thanks for the Reply Jim.

The problem is that the ping command is not working properly on my system (redhat) It get stuck on the command prompt. That's why I am trying to check the status of server using ssh command. Is there any other alternative of ping.
# 4  
I'm wondering why you can't execute the ping command in the first place. Maybe it has been excluded from your $PATH and you're not root.
Anyway, check if this link or this one shed any light.
Alternatively, I believe the best way to check the status of a whole bunch of servers would be setting up a NMS such as Zabbix or Nagios.
Hope it helps.
# 5  
This contains the positive and negative logic
Code:
#endless loop
while :
do
  alive=0
  dead=0
  for server in $content_manager
  do
    uptime=`ssh -qnx cognos@"$server"m 'uptime' 2>/dev/null`
    if [ $? -eq 0 ]
    then
      alive=$(( $alive + 1 ))
      echo "$server : $uptime"
    else
      dead=$(( $dead + 1 ))
    fi
    sleep 1 # give the OS time to release sockets
  done
  if [ $alive -eq 0 ]
  then
    echo "Content Manager server is Down"
    exit
  fi
  if [ $dead -gt 0 ]
  then
    echo "Content Manager server is degraded"
  fi
done

--
In RedHat you would need ping -c 1 to stop after one sample.
But testing a service like ssh is safer than ping, and can even deliver something useful.
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