Shell implementation of Memcache cache cache hit rate monitoring script

The company has several The server Open multiple memcached process , In addition to monitoring whether they are normal telnet through , In addition to the existence of instances, their cache hit rate should be monitored . Alarm for their cache hit rate .

There is one on the Internet. perl Written , Build install required . There is one python Written , Paste it and run it , Find out python Wrong library version . Such a simple script takes so much effort , I just wrote it manually .

The more I write, the more I feel shell Processing data , function , String arrays are too weak .

not so bad , Let's use it together . This script is relatively simple , adopt check_tcp Script get memcached Of stats Information . Then format the information into a string , And then get_hits Above cmd_gets You can get the cache hit rate . The basic principle is relatively simple . But it has to be realized nagios Alarm format for , And output of performance data , Support pnp mapping .

For the convenience of the party , Insert the previous function directly into the script on demand , It should be a copy and paste operation .

If there is bug Please feedback ！

#!/bin/bash ############################### # Check memcached shooting # load nagios Bring their own utils.sh ############################### source /usr/local/nagios/libexec/utils.sh print_usage() {     echo "check_memcached -H IP -P port -w warning -c critical" } ################### # Get command line execution parameters ################### while test -n "$1";do     case "$1" in         -H)             host=$2             shift             ;;         -P)             port=$2             shift             ;;         -w)             warning=$2             shift             ;;         -c)             critical=$2             shift             ;;         *)             echo "Unknown argument:$1"             print_usage             exit $STATE_UNKNOWN             ;;     esac     shift done ######################## #function div_f() # Inspection parameters , Returns the ratio of two numbers ######################## function div_f() {     ref=`awk -v num_a=$1 -v num_b=$2 'BEGIN{printf "%0.2f \n",num_a/num_b}'`;     echo $ref; } ################## # Get the hit rate function ################## function getMemcachedHits() {     memcachedinfo=`/usr/local/nagios/libexec/check_tcp -H $host -p $port -E -s 'stats\r\nquit\r\n' -e 'uptime' | tr "\r" "@"`     get_hits=`echo $memcachedinfo | grep -o "@ STAT get_hits [0-9]*"| awk '{print $4}'`     cmd_get=`echo $memcachedinfo | grep -o "@ STAT cmd_get [0-9]*"| awk '{print $4}'`     div_f $get_hits $cmd_get; } hits=`getMemcachedHits $host $port`; ################## # Get the hit rate range ################## function re_rang() {     rang=$hits;     interval_a=$critical;     interval_b=$warningl     if [[ $rang < $interval_a ]];then         echo "0";     elif [[ $rang < $interval_b ]];then         echo "1";     elif [[ $rang > $interval_b ]]||[[ $rang == $interval_b ]] ;then         echo "2";     else         return;     fi } res=`re_rang $critical $warning $hits`; case "$res" in     0)         echo "Critical memcached_hits=$hits|memcached_hits=$hits;$warning;$critical;"         exit $STATE_CRITICAL         ;;     1)         echo "Warning  memcached_hits=$hits|memcached_hits=$hits;$warning;$critical;"         exit $STATE_WARNING         ;;     2)         echo "Ok  memcached_hits=$hits|memcached_hits=$hits;$warning;$critical;"         exit $STATE_OK         ;;     *)         echo "Unkown"         exit $STATE_UNKNOWN         ;; esac