# cat /etc/redhat-release php
CentOS release 6.8 (Final)linux
# uname -rios
3.10.5-3.el6.x86_64web
Nagios服務端主機:192.168.70.67 密碼:ikongjian@2016! docker
Nagios客戶端主機:192.168.70.52 密碼:ikongjian@2016! vim
Nagios版本: nagios-3.5.1bash
Plugin插件版本: nagios-plugins-1.4.16less
Nrpe版本: nrpe-2.12 ide
安裝路徑: /usr/local/nagios工具
實現目的:實現docker容器的內存監控
實現工具:監控系統nagios
實現原理:
1,nagios客戶端寫dcoker容器內存監控插件,並開啓nrpe守護進程
2,服務端check_nrpe連接客戶端守護進程,取插件執行結果,返回給web界面。
/usr/local/nagios/etc/nrpe.cfg
增長如下配置:
command[check_docker101]=/usr/local/nagios/libexec/check_docker101
插件以下:
vim /usr/local/nagios/libexec/check_docker101
#/bin/bash
DOCKER_NAME=`echo $0|awk -F '_' '{print $2}'`
DOCKER_ID=`cat /data/docker_id.txt|grep ${DOCKER_NAME}|awk '{print $2}'`
TOTAL_MEM=`cat /cgroup/memory/docker/${DOCKER_ID}/memory.limit_in_bytes`
USE_MEM=`cat /cgroup/memory/docker/${DOCKER_ID}/memory.usage_in_bytes`
FREE=`echo ${TOTAL_MEM}-${USE_MEM}|bc`
FREE_MB=`expr $FREE/1024/1024|bc`
if [ $FREE_MB -ge 100 ]
then
echo "CHECK_MEORY OK - $FREE_MB M free "
exit 0
elif [ $FREE_MB -lt 100 -a $FREE_MB -gt 30 ]
then
echo "CHECK_MEORY WARNING - $FREE_MB M free"
exit 1
elif [ $FREE_MB -le 30 ]
then
echo "CHECK_MEORY CRITICAL - $FREE_MB M free"
exit 2
else
echo "CHECK_MEORY UNKOWN mem lessest"
exit 3
fi
給權限:
chmod 755 /usr/local/nagios/libexec/check_docker101
chown nagios.nagios /usr/local/nagios/libexec/check_docker101
執行查件:
[root@test6 data]# /usr/local/nagios/libexec/check_docker101
CHECK_MEORY OK - 261 M free
A:配置命令文件——commands.cfg
define command{
command_name check_docker101
command_line $USER1$/check_docker101
}
B:配置主機文件——host.cfg
define host{
use linux-server
host_name docker
alias docker
address 192.168.70.52
max_check_attempts 3
normal_check_interval 2
process_perf_data 1
action_url /nagios/pnp/index.php?host=$HOSTNAME$
}
C:配置服務文件——service.cfg
define service{
use generic-service
host_name docker
service_description docker_mem_101
check_command check_nrpe!check_docker101
process_perf_data 1
}
用check_nrpe測試遠端插件:
[root@BI-test etc]# /usr/local/nagios/libexec/check_nrpe -H 192.168.70.52 -c check_docker101
CHECK_MEORY OK - 261 M free
一切正常。