07.06.2023

MongoDB on Kubernetes

Introduction

In the Serverspace you can create a server with already installed app "MongoDB".
MongoDB is one of most popular NoSQL database management solution. In combination with Kubernetes orchestrator it could be easy-to-scale, multipurpose solution.

Requirements

To work with MongoDB in Kubernetes you need one server under any operation system (Linux with root access or sudo membership preferred) to manage and Kubernetes cluster (see next step).

Kubernetes instance creation

Before deploy MongoDB you need to have Kubernetes. To create it in ServerSpace infrastructure, just login into your client area, then click to Kubernetes link and create an instance:

Process may take a time, please be patient. When finished, you will see cluster parameters and should download access credentions file:

Instance setup

To install database service on your Kubernetes cluster please do follow:

sudo -s
apt-get update && apt install curl apt-transport-https -y && curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - && echo "deb https://apt.kubernetes.io/ kubernetes-xenial main" | tee -a /etc/apt/sources.list.d/kubernetes.list && apt-get update && apt install kubectl -y

mkdir /usr/local/etc/mongo && cd /usr/local/etc/mongo
cat << EOF > testcluster.conf
<PASTE CONFIGURATION DATA HERE>
EOF
echo "export KUBECONFIG=testcluster.conf" >> ~/.bashrc

kubectl cluster-info

If output looks like picture below - connection is successful

cat << EOF > PersistVolClaim.yaml
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: mongodatapv # Should be the same with name in previous file
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi # Should be the same with capacity in previous file
EOF

Next step is creating credentials file, which stores access to MongoDB:

cat << EOF > Creds.yaml
apiVersion: v1
data:
username: <BASE64_ENCODED_LOGIN>
password: <BASE64_ENCODED_PASSWORD>
kind: Secret
metadata:
creationTimestamp: null
name: creds
EOF

Tip: To encode and decode data you can use simple commands:

echo <DATA> | base64 # to crypt data via base64 tool
echo <BASE64_ENCRYPTED_DATA> | base64 -d # to decrypt it

kubectl apply -f

Successful output looks like at picture below:

Connection check

kubectl exec deployment/client -it -- /bin/bash
mongo

In case you see MongoDB prompt, connect is succesful:

 

use NEW_DATABASE_NAME
db.createCollection("newdata") # example to add data
show dbs # check is database exist

Conclusion

After this article reading you knew how to create Kubernetes via ServerSpace client area, deploy MongoDB into it, create new database and insert new data to this base.