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The clusterXL_monitor_ips script can be used to ping a list of predefined IP addresses and change the state of the cluster member to Down or Up based on the replies to these pings.
This shell script registers a pnote (called host_monitor) and gracefully changes the state of the given cluster member to Down (by reporting the state of that pnote as problem), or gracefully reverts the state of the given cluster member to Up (by reporting the state of that pnote as ok).
The clusterXL_monitor_ips script is located in $FWDIR/bin/ directory on your cluster members.
Note - Cluster member will go down even if one ping is not answered.
For more information, see sk35780.
Important - You must do these changes on all cluster members.
Example:
#!/bin/sh # The script tries to ping the hosts written in the file $FWDIR/conf/cpha_hosts. # The names (must be resolveable) ot the IPs of the hosrs must be written in seperate lines. # the file must not contain anything else. # We ping the given hosts every number of seconds given as parameter to the script. # USAGE: # cpha_monitor_ips X silent # where X is the number of seconds between loops over the IPs. # if silent is set to 1, no messages will appear on the console # # We initially register a pnote named "host_monitor" in the problem notification mechanism # when we detect that a host is not responding we report the pnote to be in "problem" state. # when ping succeeds again - we report the pnote is OK.
silent=0
if [ -n "$2" ]; then if [ $2 -le 1 ]; then silent=$2 fi fi hostfile=$FWDIR/conf/cpha_hosts arch=`uname -s` if [ $arch = "Linux" ] then #system is linux ping="ping -c 1 -w 1" else ping="ping" fi $FWDIR/bin/cphaprob -d host_monitor -t 0 -s ok register TRUE=1 while [ "$TRUE" ] do result=1 for hosts in `cat $hostfile` do if [ $silent = 0 ] then echo "pinging $hosts using command $ping $hosts" fi if [ $arch = "Linux" ] then $ping $hosts > /dev/null 2>&1 else $ping $hosts $1 > /dev/null 2>&1 fi status=$? if [ $status = 0 ] then if [ $silent = 0 ] then echo " $hosts is alive" fi else if [ $silent = 0 ] then echo " $hosts is not responding " fi result=0 fi done if [ $silent = 0 ] then echo "done pinging" fi if [ $result = 0 ] then if [ $silent = 0 ] then echo " Cluster member should be down!" fi $FWDIR/bin/cphaprob -d host_monitor -s problem report else if [ $silent = 0 ] then echo " Cluster member seems fine!" fi $FWDIR/bin/cphaprob -d host_monitor -s ok report fi if [ "$silent" = 0 ] then echo "sleeping" fi sleep $1 echo "sleep $1" done
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