使用zabbix低级自动发现监控docker容器

1：在docker宿主机上编写扫描docker容器名称的脚本


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[root@node1 zabbix_agentd.d]# cat /etc/zabbix/script/docker_discovery.sh 
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#!/bin/bash
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port=($(/usr/bin/docker ps -a|grep -v "CONTAINER ID"|awk '{print $NF}'))
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printf '{\n'
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printf '\t"data":[\n'
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   for key in ${!port[@]}
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       do
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           if [[ "${#port[@]}" -gt 1 && "${key}" -ne "$((${#port[@]}-1))" ]];then
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              printf '\t {\n'
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              printf "\t\t\t\"{#CONTAINERNAME}\":\"${port[${key}]}\"},\n"
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         else [[ "${key}" -eq "((${#port[@]}-1))" ]]
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              printf '\t {\n'
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              printf "\t\t\t\"{#CONTAINERNAME}\":\"${port[${key}]}\"}\n"
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           fi
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   done
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              printf '\t ]\n'
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              printf '}\n'
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#脚本效果如下：
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[root@node1 zabbix_agentd.d]# sh /etc/zabbix/script/docker_discovery.sh
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{
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    "data":[
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     {
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            "{#CONTAINERNAME}":"k8s_install-cni_kube-flannel-ds-amd64-4cr9d_kube-system_39d5a60d-702c-466c-97e0-85123e1a7869_0"},
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     {
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            "{#CONTAINERNAME}":"k8s_nginx_nginx_default_3f5ffd65-a233-48c5-973d-b43922ccea61_0"},
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     {
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            "{#CONTAINERNAME}":"k8s_POD_nginx_default_3f5ffd65-a233-48c5-973d-b43922ccea61_0"},
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     {
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            "{#CONTAINERNAME}":"k8s_kube-flannel_kube-flannel-ds-amd64-4cr9d_kube-system_39d5a60d-702c-466c-97e0-85123e1a7869_3"},
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     {
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            "{#CONTAINERNAME}":"k8s_kube-proxy_kube-proxy-sqhs4_kube-system_1c7fac8f-5263-4cd8-b008-485f1dd44ad1_3"},
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     {
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            "{#CONTAINERNAME}":"k8s_POD_kube-flannel-ds-amd64-4cr9d_kube-system_39d5a60d-702c-466c-97e0-85123e1a7869_3"},
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     {
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            "{#CONTAINERNAME}":"k8s_POD_kube-proxy-sqhs4_kube-system_1c7fac8f-5263-4cd8-b008-485f1dd44ad1_3"}
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     ]
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}
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#注意事项！！！
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zabbix-agent在取值的时候使用的是zabbix用户，在执行docker ps -a会没有权限执行
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解决方法有两种
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1：添加sudo授权
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2：给docker命令加suid权限
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chmod u+s /usr/bin/docker
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推荐使用第二种，比较简单

2：在docker宿主机上编写docker容器的取值脚本


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#取值来源/usr/bin/docker stats --no-stream
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[root@node1 zabbix_agentd.d]# cat /etc/zabbix/script/docker_monitor.sh 
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#!/bin/bash
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CACHEFILE="/tmp/docker_monitor_cache.txt"
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CMD="/usr/bin/docker stats --no-stream"
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if [ ! -f $CACHEFILE  ];then
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   $CMD >$CACHEFILE 
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fi
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# Check and run the script
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TIMEFLM=`stat -c %Y $CACHEFILE`
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TIMENOW=`date +%s`
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if [ `expr $TIMENOW - $TIMEFLM` -gt 60 ]; then
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    rm -f $CACHEFILE
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fi
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if [ ! -f $CACHEFILE  ];then
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   $CMD >$CACHEFILE 
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fi
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container_live() {
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   grep "$1"  $CACHEFILE &>/dev/null
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   if [ $? -eq 1 ];then
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   echo '0'
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   else 
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   echo '1'
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   fi
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   exit  0
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}
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container_id() {
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    grep "$1"  $CACHEFILE|awk '{print $1}'
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   exit  0
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}
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container_cpu() {
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    grep "$1"  $CACHEFILE|awk '{print $3}'|tr -d '%'
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    exit  0
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}
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container_mem_used() {
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    grep "$1"  $CACHEFILE|awk '{print $4}'|tr -d 'MiB'
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    exit  0
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}
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container_mem_pused() {
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    grep "$1"  $CACHEFILE|awk '{print $7}'|tr -d '%'
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    exit  0
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}
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container_net_in() {
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    grep "$1"  $CACHEFILE|awk '{print $8}'|tr -d '%'
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    exit  0
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}
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container_net_out() {
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    grep "$1"  $CACHEFILE|awk '{print $10}'|tr -d '%'
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    exit  0
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}
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container_disk_in() {
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    grep "$1"  $CACHEFILE|awk '{print $11}'
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    exit  0
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}
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container_disk_out() {
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    grep "$1"  $CACHEFILE|awk '{print $13}'
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    exit  0
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}
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case $1 in
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live)
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container_live $2;
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;;
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id)
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container_id $2;
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;;
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cpu)
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container_cpu $2;
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;;
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mem_used)
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container_mem_used $2;
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;;
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mem_pused)
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container_mem_pused $2;
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;;
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net_in)
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container_net_in $2;
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;;
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net_out)
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container_net_out $2;
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;;
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disk_in)
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container_disk_in $2;
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;;
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disk_out)
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container_disk_out $2;
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;;
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*)
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echo '无效的参数';
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exit 2;
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esac

3：修改zabbix-agent配置文件


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[root@node1 zabbix_agentd.d]# cat /etc/zabbix/zabbix_agentd.d/zbx_docker.conf 
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UserParameter=docker.discovery,/bin/bash /etc/zabbix/script/docker_discovery.sh
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UserParameter=docker_monitor[*],/bin/bash /etc/zabbix/script/docker_monitor.sh $1 $2
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systemctl  restart  docker

4：使用zabbix-get测试取值


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#测试1
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[root@oldboy ~]# zabbix_get -s 10.0.0.12 -k docker.discovery
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{
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    "data":[
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     {
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            "{#CONTAINERNAME}":"k8s_install-cni_kube-flannel-ds-amd64-4cr9d_kube-system_39d5a60d-702c-466c-97e0-85123e1a7869_0"},
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     {
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            "{#CONTAINERNAME}":"k8s_nginx_nginx_default_3f5ffd65-a233-48c5-973d-b43922ccea61_0"},
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     {
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            "{#CONTAINERNAME}":"k8s_POD_nginx_default_3f5ffd65-a233-48c5-973d-b43922ccea61_0"},
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     {
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            "{#CONTAINERNAME}":"k8s_kube-flannel_kube-flannel-ds-amd64-4cr9d_kube-system_39d5a60d-702c-466c-97e0-85123e1a7869_3"},
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     {
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            "{#CONTAINERNAME}":"k8s_kube-proxy_kube-proxy-sqhs4_kube-system_1c7fac8f-5263-4cd8-b008-485f1dd44ad1_3"},
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     {
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            "{#CONTAINERNAME}":"k8s_POD_kube-flannel-ds-amd64-4cr9d_kube-system_39d5a60d-702c-466c-97e0-85123e1a7869_3"},
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     {
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            "{#CONTAINERNAME}":"k8s_POD_kube-proxy-sqhs4_kube-system_1c7fac8f-5263-4cd8-b008-485f1dd44ad1_3"}
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     ]
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}
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#测试2
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[root@oldboy ~]# zabbix_get -s 10.0.0.12 -k docker_monitor[mem_used,k8s_nginx_nginx_default_3f5ffd65-a233-48c5-973d-b43922ccea61_0]
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3.102