Overview of Rocket Chat Deployment with Docker and Kubernetes

Overview of Deploying Rocket Chat on Kubernetes

An open-source container orchestration engine and also an abstraction layer for managing full-stack operations of hosts and containers. Click to explore about, Kubernetes Architecture and its Components

Requirements for Rocket Chat Deployment on Kubernetes

• Kubernetes
• Shared Persistent Storage - Option are GlusterFS, Ceph FS, AWS EBS, AzureDisk etc.
• Rocket Chat Application
• Dockerfile
• Container-Registry
• Kubectl

• Private Docker Hub
• AWS ECR
• Docker Store
• Google Container Registry

an open-source system, developed by Google, an orchestration engine for managing containerized applications over a cluster of machines. Click to explore about, Kubernetes Deployment Tools and Best Practices

What are the steps for Deploying Rocket Chat on Kubernetes?

The steps for Rocket Chat deployment on Kubernetes are listed below:

Create a Rocket Chat Container Custom Image

FROM node: 4 - slim
MAINTAINER XenonStack
COPY bundle / /app/
RUN cd / app / programs / server\ && npm install
ENV PORT = 3000\
ROOT_URL = http: //localhost:3000
 EXPOSE 3000
CMD["node", "/app/main.js"]

Build Rocket Chat Docker Custom Image

Create a MongoDB Container Custom Image

FROM ubuntu
MAINTAINER XenonStack
RUN apt - key adv--keyserver hkp: //keyserver.ubuntu.com:80 --recv 7F0CEB10 && \
 echo "deb http://repo.mongodb.org/apt/ubuntu   trusty/mongodb-org/3.0 multiverse" | tee / etc / apt / sources.list.d / mongodb - org - 3.0.list && \
 apt - get update && \
 apt - get install - y mongodb - org
VOLUME["/data/db"]
WORKDIR / data
EXPOSE 27017
CMD["mongod"]

Building a MongoDB Docker Custom Image

Adding Container Registry to Docker Daemon

$ docker version
Client:
 Version: 17.03 .1 - ce
API version: 1.27
Go version: go1 .7 .5
Git commit: c6d412e
Built: Mon Mar 27 17: 14: 09 2017
OS / Arch: linux / amd64(Ubuntu 16.04)

Pushing Custom PostgreSQL Container Image to Container Registry

• Private Docker Hub
• AWS ECR
• Docker Store
• Google Container Registry

If you have authentication enabled on container registry then you need to login first then we can upload or download images from container registry. To Login follow below mentioned command $ docker login <name of your container registry> Username : xxxx

Password: xxxxx

For AWS ECR you will get registry url, username and password from respective cloud provider when you launch container registry on cloud. Here is shell script that will add your aws credentials for Amazon ECR.

#!/bin/bash
pip install--upgrade--user awscli
mkdir - p~/.aws && chmod 755 ~/.aws

cat << EOF > ~/.aws/credentials [
 default
]
aws_access_key_id = XXXXXX
aws_secret_access_key = XXXXXX
EOF

cat << EOF > ~/.aws/config [
 default
]
output = json
region = XXXXX
EOF

chmod 600~/.aws/credentials

ecr - login = $(aws ecr get - login--region XXXXX)
$ecr - login

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Create a Storage Volume (Using GlusterFS)

$ gluster volume create apt - cacher replica 2 transport tcp k8 - master: /mnt/brick
1 / mongodb - disk k8 - 1: /mnt/brick
1 / mongodb - disk
$ gluster volume start mongodb - disk
$ gluster volume info mongodb - disk

Deploy MongoDB on Kubernetes

• Docker Image: We have created a Docker Image for MongoDB in Step 4 and pushed to docker hub or private docker registry.
• Persistent Shared Storage Volume: We have created a Persistent Shared Storage Volume of glusterfs in Step 6
• Deployment & Service Files: Next, we will create Deployment & Service Files for Kubernetes.

apiVersion: extensions / v1beta1
kind: Deployment
metadata:
 name: mongodb3
namespace: production
spec:
 replicas: 1
template:
 metadata:
 labels:
 k8s - app: mongodb3
spec:
 containers:
 -name: mongodb3
image: dr.xenonstack.com: 5050 / mongo: v3 .0
imagePullPolicy: "IfNotPresent"
ports:
 -containerPort: 27017
volumeMounts:
 -mountPath: /data/db
name: mongodisk1
volumes:
 -name: mongodisk1
glusterfs:
 endpoints: glusterfs - cluster
path: mongodb - disk
readOnly: false

apiVersion: v1
kind: Service
Metadata:
 labels:
 k8s - app: mongodb3
name: mongodb3
namespace: production
spec:
 type: NodePort
Ports:
 -port: 27017
selector:
 k8s - app: mongodb3

Deploy Rocket Chat on Kubernetes

• Docker Image: We have created a Docker Image for Rocket chat in Step 2.
• Deployment & Service Files: In the below mentioned steps, we will create Deployment & Service Files.

apiVersion: extensions / v1beta1
kind: Deployment
metadata:
 name: rocketchat
namespace: production
spec:
 replicas: 1
template:
 metadata:
 labels:
 k8s - app: rocketchat
spec:
 containers:
 -name: rocketchat
image: dr.xenonstack.com: 5050 / rocketchat: v1 .0
imagePullPolicy: "IfNotPresent"
ports:
 -containerPort: 3000
env:
 -name: MONGO_URL
value: "mongodb://mongodb3:27017/rocketchat"

apiVersion: v1
kind: Service
metadata:
 labels:
 k8s - app: rocketchat
name: rocketchat
namespace: production
spec:
 type: NodePort
ports:
 -port: 3000
selector:
 k8s - app: rocketchat

Test MongoDB Database

Test Rocket Chat Application

Troubleshooting of Rocket Chat Application Container

• Check Logs of Rocket Chat Application and MongoDB Pods.
• Check the NameSpace of both Containers/Pods/Service of MongoDB and RocketChat is in same.
• Try to Connect MongoDB from local Mongo Client using Cluster IP Address.
• Check Network Connectivity from Rocketchat to MongoDB Pods.

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Summarizing Rocket Chat Deployment on Kubernetes

A Holistic Strategy

• Explore our use case, how to Deploy Cloud-Native Applications in Kubernetes
• Read how we Build Multi-Model Database on Kubernetes
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