docker 检查容器连接数

检测 docker 容器的tcp 连接情况，并做统计(window 和mac 环境不支持)
用法：./detect.sh

#!/usr/bin/env bash


tmp_result="/tmp/docker_connections";

detectTCPConnection(){

    echo "start detecting...";

    list=$(docker ps -f 'status=running' --format "table {{.ID}}");

    list=${list#CONTAINER ID};

    test -z "${list}" &amp;&amp; echo "container id is null" &amp;&amp; exit 0;

    timestamp=$(date +"%Y%m%d%H%M%S");
    test ! -d "${tmp_result}" &amp;&amp; mkdir ${tmp_result};
    cd ${tmp_result};

    for i in $list; do
        pid=$(docker inspect -f {{.State.Pid}} $i);
    echo "start detect for pid:${pid}";
    tmpFile="${i}_${pid}.txt";
    echo  "make file ${tmpFile}";

    test -a "$tmpFile" &amp;&amp; rm -f $tmpFile;

    nsenter -t $pid -n netstat |grep ESTABLISHED &gt; $tmpFile;
    echo "end statistic connection for container  ${i}";
    done

}

doStatisticTCPConection(){

    test ! -d "${tmp_result}" &amp;&amp; echo "not data for statistic" && exit 0;
    cd ${tmp_result};

    for i in *.txt; do

        echo "${i} tcp connections:$(cat ${i} | grep "6379"  | wc -l)";

    done


}


select i in 'do detect' 'do statistic' 'do both';do

case $i in
'do detect')
detectTCPConnection;
;;
'do statistic')
doStatisticTCPConection;
;;
'do both')
detectTCPConnection;
doStatisticTCPConection;
;;
*)
echo "usage: ./detect.sh ";
;;
esac
done