Installing & configuring Nagios server and Nagios host in docker containers

1. Nagios in Docker Containers
DevOps – Continuous Monitoring

2. Continuous
Testing
Continuous
Deployment
Continuous
Monitoring
DevOps
Continuous
Integration
Continuous
Development
Continuous Feedback

3. Install Nagio server image
in docker container
Select a Nagios image -> download
the image (docker pull
appcontainers/Nagios) -> Create
the docker container (docker run -d -
it --name nagiosserver -h nagios -p
8181:80 appcontainers/Nagios) ->
Configure a Nagio user in Nagios
server command prompt (htpasswd -
c -b /etc/nagios/passwd username
password) -> Login to Nagios server
from browser with the help of user
created in previous step
(http://localhost:8181/nagios/) ->

4. Install & configure a Nagios
host in docker container
Download a server(ubuntu/centos)
image (docker pull
nuagebec/Ubuntu) -> Create the
docker container (docker run -d -p
0.0.0.0:2222:22 nuagebec/Ubuntu)->
Install NRPE server plugin in the
server container (sudo apt-get install
nagios-nrpe-server nagios-plugins)->
Update server address and port in
nrpe.cfg file ( vim
/etc/nagios/nrpe.cfg;
server_address=172.17.0.02,
server_port=8181) ->

5. Configure Nagios host in
Nagios server
Update server folder location in
Nagios.cfg file in Nagios server (vim
/etc/nagios/nagios.cfg ;
cfg_dir=/etc/nagios/servers) ->
Add server folder in Nagios server
(mkdir -p /etc/nagios/servers ) ->
Create a configuration file in Nagios
host and save in the server folder
(vim
/etc/nagios/servers/ubuntu_host.cf
g ) ->

6. Test the Nagios host
configuration update
Restart NRPE service server in
Nagios host (service nagios-nrpe-
server restart)-> Restart Nagios
service in Nagios server (service
nagios restart)-> Open the Nagios
server browser and verify Nagios
host has been added.

7. Thank you
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