linux shell利用nc命令检测机器端口 + supervisorctl检测进程状态

192.168.1.101

#!/bin/bash
function checkStatus()
{
    # 检测rfidConnecter进程的状态，返回的是一串字符串
    str1=$(supervisorctl status rfidConnecter)
    # 判断进程是否存活的一个字符串
    str2="RUNNING"
    # 判断检测结果中是否包含RUNNING字符串，如果包含返回非空字符串
    r=$(echo $str1 | grep "${str2}")
    if [[ "$r" != "" ]];then
        return 0
    else
        return 1
    fi
}


step=2 #间隔的秒数，不能大于60
for (( i = 0; i < 60; i=(i+step) )); do
    sleep $step
    nc -v -w 5 -z 192.168.1.103 5000 &> /dev/null
    age=$?
    checkStatus
    status=$?
    if (( $age == 0 )); then
        if (( $status == 0 )); then
            echo "0_stop_关闭本地5000" > /z.txt
            supervisorctl stop rfidConnecter
        else
            echo "0_stop_无需关闭5000" > /z.txt
        fi
    else
        if (( $status == 1 )); then
            echo "1_start_开启本地5000" > /z.txt
            supervisorctl start rfidConnecter
        else
            echo "1_start_无需开启5000" > /z.txt
        fi
    fi
done
exit 0

192.168.1.103

#!/bin/bash
function checkStatus()
{
    str1=$(supervisorctl status rfidConnecter)
    str2="RUNNING"
    r=$(echo $str1 | grep "${str2}")
    if [[ "$r" != "" ]];then
        return 0
    else
        return 1
    fi
}


step=4 #间隔的秒数，不能大于60
for (( i = 0; i < 60; i=(i+step) )); do
    sleep $step
    nc -v -w 5 -z 192.168.1.101 5000 &> /dev/null
    age=$?
    checkStatus
    status=$?
    if (( $age == 0 )); then
        if (( $status == 0 )); then
            echo "0_stop_关闭本地5000" > /z.txt
            supervisorctl stop rfidConnecter
        else
            echo "0_stop_无需关闭5000" > /z.txt
        fi
    else
        if (( $status == 1 )); then
            echo "1_start_开启本地5000" > /z.txt
            supervisorctl start rfidConnecter
        else
            echo "1_start_无需开启5000" > /z.txt
        fi
    fi
done
exit 0

说明：“$?”表示获取上一条命令执行的结果，如下：

# nc判断主机端口是否开放
nc -v -w 5 -z 192.168.1.101 5000 &> /dev/null
# 接收nc判断结果，0.开放；1.关闭
age=$?
# 调用自定义方法，检查本地进程是否OK
checkStatus
# 接收检查结果，0.OK；1.NG
status=$?