Docker

Copy file docker-compose.example.yml to docker-compose.yml

cp docker-compose.example.yml docker-compose.yml

Fluentd

Create configuration in folder conf/fluentd by renaming them using *.example.cfg

Verify the main configuration file conf/fluentd/fluentd.cfg. This file includes other configurations file.

Enable this in docker-compose.yml by removing following comments:

environment:
  - FLUENTD_CONF=fluentd.cfg

Configure appropriate username/password for each match section in the configuration files.

MongoDB

Administration user

Create a password for user root. If it is a production server, make sure to create a strong password.

How to create username application/docker user

Log in to mongo container in order to create appropriate username/password for each mongodb database.

As an example, user name docker is created with a password example for read/write access on database name fluentd.

$ mongo -u root -p example --authenticationDatabase admin fluentd
> db.createUser({ user : "docker", pwd : "example", roles: [ {db: "fluentd", role: "readWrite"}]})
Successfully added user: {
	"user" : "docker",
	"roles" : [
		{
			"db" : "fluentd",
			"role" : "readWrite"
		}
	]
}
> exit
$ mongo -u docker -p example --authenticationDatabase fluentd
MongoDB shell version v4.0.1
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 4.0.1
> 

Or

mongo admin -u root -p example

How to test it:

We can use a simple nginx docker image

docker run --log-driver=fluentd --log-opt tag="mongo.{{.ImageName}}/{{.Name}}/.ID}}" -p 8080:80 nginx

Point a browser to port 8080

Mongo-Express

Only use it for private development purpose ONLY. Never enable it on production server.