Nagios--docker Container Monitoring

1. Environment:

# Cat/etc/redhat-release

CentOS Release 6.8 (Final)

# Uname-r

3.10.5-3.el6.x86_64

Nagios Server Host:192.168.70.67 Password:[Email protected]!

Nagios Client Host:192.168.70.52 Password:[Email protected]!

2. version

Nagios version: nagios-3.5.1

Plugin plugin version: nagios-plugins-1.4.16

Nrpe version: nrpe-2.12

installation path: /usr/local/nagios

3. Demand Analysis

purpose of implementation : Implements memory monitoring for Docker containers

Implementation Tools : Monitoring System Nagios

Implementation Principle :

1,nagios client writes dcoker container memory Monitor plugin and opens nrpe Daemon

2, the server Check_nrpe link Client daemon, take the plug-in execution results, return to the Web interface.

4. Client Configuration

/usr/local/nagios/etc/nrpe.cfg

Add the following configuration:

Command[check_docker101]=/usr/local/nagios/libexec/check_docker101

The plugin is as follows:

Vim/usr/local/nagios/libexec/check_docker101

#/bin/bash

Docker_name= ' echo $0|awk-f ' _ ' {print $} '

Docker_id= ' Cat/data/docker_id.txt|grep ${docker_name}|awk ' {print $} '

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

Give permission:

chmod 755/usr/local/nagios/libexec/check_docker101

Chown nagios.nagios/usr/local/nagios/libexec/check_docker101

Perform search:

[Email protected] data]#/usr/local/nagios/libexec/check_docker101

Check_meory OK-261 M Free

5. server-side configuration

A: Configuration command File--commands.cfg

Define Command{

Command_name check_docker101

Command_line $USER 1$/check_docker101

}

B: Configure the Hosts file--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: Config service file--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

}

To test the remote plugin with Check_nrpe:

[Email protected] etc]#/usr/local/nagios/libexec/check_nrpe-h 192.168.70.52-c check_docker101

Check_meory OK-261 M Free

Everything is fine.

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Nagios--docker Container Monitoring