check_host : 检查服务器的网络链接和进程，输出json格式。可扩展

check_host.sh

#!/bin/env bash
############################################################
#Author    : ChinaXing - chen.yack@gmail.com
#Create    : 2013-01-20 15:56
#Function  : check hosts status 
#            检查服务器状态:
#            1. 网络链接
#               a. ESTAB链接列表
#               b. LISTEN端口列表
#            2. 进程
#               a. httpd,nginx,java,php进程列表
#Output    : 1. json格式 { status : xxx , data : xxx }
#            2. status: success / error
#               data : [
#                        { "NETSTAT" : { 
#                                        "LISTEN" : [ "...","..." ],
#                                        "ESTABLISHED" : [ "...","..." ],
#                                      } 
#                        },
#                        { "PROCESS" : [ 
#                                        " ... ", " ... "
#                                      ] 
#                        },
#                       ]
############################################################

PROCESS_CHECKED="nginx|httpd|java|php"


# 检查链接
function netstat
{
    command netstat -anp 2>/dev/null | \
        awk 'BEGIN{i=0;j=0;}
    {
        if($6 ~ /LISTEN/){
            l[i++]=$1" "$4" "$5" "$7
        }else if ($6 ~ /ESTABLISH/){
            e[j++]=$1" "$4" "$5" "$7
        }
    }END{
        print "\t{\n\t\"LISTEN\"",":[";
        first=1; 
        for(i in l){
            if(first){ printf "\n\t\t\"%s\"",l[i]; first=0} 
            else { printf "\n\t\t,\"%s\"",l[i]; }
        }
        print "\n\t\t],\n\t\"ESTABLISHED\"",":[";
        first=1;
        for(j in e){
            if(first){ printf "\n\t\t\"%s\"",e[i]; first=0} 
            else { printf "\n\t\t,\"%s\"",e[i]; }
        }
        print "\n\t\t]\n\t}";
    }'
    # netstat exit status
    return ${PIPSTATUS[1]} || $?
}


# 检查进程
function process
{
   local first=1
   echo -e "\t["
   ps ax -ouser,command | \
       grep -vw " grep " | grep -E -w "($PROCESS_CHECKED)" | \
       while read line 
       do
           if [ $first -eq 1 ]
           then
               first=0
               echo $'\t'$'\t'"\"$line\""
           else
               echo $'\t'$'\t',"\"$line\""
           fi
       done
  echo -e "\t]"
}

#######################################
#
############## main ###################
#
#######################################

# proccess
if PROCESS=$(process)
then
    echo '"PROCESS" : " { "status" : "success" , "data" : '
    echo "$PROCESS"
    echo '}'
else
    echo '"PROCESS" : " { "status" : "error" , "data" : "fetch process info failed" }'
fi

# netstat
if NETSTAT=$(netstat)
then
    echo '"NETSTAT" : " { "status" : "success" , "data" : '
    echo "$NETSTAT"
    echo '}'
else
    echo '"NETSTAT" : " { "status" : "error" , "data" : "fetch network info failed" }'
fi