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Docker-Compose

Running MongoDB on Docker Compose

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In this article, we will discuss how DBA can run a MongoDB instance using docker-compose. It’s very easy and quite flexible to handle. According to my opinion docker-compose removes all the installation and configuration pain when you need a test instance immediately. In a non-production environment for proof of concepts (POC) environment, you can easily use MongoDB on docker-compose.

 

High-Level Steps for Installation & Configuration

  • Install Docker 
  • Install Docker compose
  • Take the docker-compose code with MongoDB 
  • Run the docker-compose 
  • Connect to MongoDB Database
  • Connect From MongoDB from Docker bash

Prerequisites

mkdir -p /opt/docker_com_repo

cd /opt/docker_com_repo

vi docker-compose.yml

Copy Below docker compose code for MongoDB and paste in side the docker-compose.yml

 

IMP: Remove all the comments with “< abc>” From compose code

mkdir -p  /opt/mongo/datafiles/db

mkdir  -p /opt/mongo/configfiles

Docker Compose Code

version: ‘3.3’   
services:
mongodb_container:
container_name: mongodb4.0                                                                 
image: mongo:4.0                                                                                          < Container Image>
environment:
MONGO_INITDB_DATABASE: thedbadmin                                             
MONGO_INITDB_ROOT_USERNAME: root                                                < Database Admin username>
MONGO_INITDB_ROOT_PASSWORD: oracle                                          < Database Admin Password>
ports:
– 27017:27017                                                                                                     
volumes:
– /opt/mongo/datafiles/db:/data                                                     < Persistent Volume for Data files>
– /opt/mongo/configfiles:/etc/mongod                                          < Persistent volume for MongoDB configuration file>

Ruing Docker Compose

cd /opt/docker_com_repo

docker-compose up -d

Check if the MongoDB instance started?

[root@master01 mongodb]# docker-compose ps
Name Command State Ports
———————————————————————————————–
mongodb4.0 docker-entrypoint.sh mongod Up 0.0.0.0:27017->27017/tcp,:::27017->27017/tcp

Test Database connection

[root@master01 mongodb]# telnet localhost 27017
Trying ::1…
Connected to localhost.
Escape character is ‘^]’.

if looks good than go for the next step or stop the Linux firewall 

Open MongoDB compass and connect to Database. Follow the screenshots 

Click on “Fill in connection Fields individually“

Change the hostname as per your server or machine

You can hit Create database and start using MongoDB

Connect MongoDB from the command Line 

[root@master01 mongodb]# docker exec -it mongodb4.0 bash

root@58054f03c382:/# mongo -u root -p
MongoDB shell version v4.0.24
Enter password:
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
Implicit session: session { “id” : UUID(“0d7bb9a1-9549-491c-89c3-dfc9caab7547”) }
MongoDB server version: 4.0.24
Server has startup warnings:
2021-10-02T09:05:13.292+0000 I CONTROL [initandlisten]
2021-10-02T09:05:13.293+0000 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is ‘always’.
2021-10-02T09:05:13.293+0000 I CONTROL [initandlisten] ** We suggest setting it to ‘never’
2021-10-02T09:05:13.293+0000 I CONTROL [initandlisten]
2021-10-02T09:05:13.293+0000 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is ‘always’.
2021-10-02T09:05:13.293+0000 I CONTROL [initandlisten] ** We suggest setting it to ‘never’
2021-10-02T09:05:13.293+0000 I CONTROL [initandlisten]
—
Enable MongoDB’s free cloud-based monitoring service, which will then receive and display
metrics about your deployment (disk utilization, CPU, operation statistics, etc).

The monitoring data will be available on a MongoDB website with a unique URL accessible to you
and anyone you share the URL with. MongoDB may use this information to make product
improvements and to suggest MongoDB products and deployment options to you.

To enable free monitoring, run the following command: db.enableFreeMonitoring()
To permanently disable this reminder, run the following command: db.disableFreeMonitoring()
—

> show databases;
admin 0.000GB
config 0.000GB
local 0.000GB

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