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Continuous Deployment via Argo

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Git Configuration

Login to Argo tool

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and navigate to Settings (gear icon)

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2. Navigate to Repositories

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3. Click “Connect repo using HTTPS” / SSH ‘+ CONNECT REPO USING HTTPS’ button (or ‘+ CONNECT REPO USING SSH’ as per requirement)

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4. Enter the details:

Select the type as git

Type - Select ‘git’

Repository URL, Username, Password - Enter Repo URL and credentials and connect.

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5. The added Repo repository details get are reflected in Repositories

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Project Configuration

Navigate to Repositories → Projects
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Click

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‘New Project’ button.
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Enter the required details and save
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The saved project is reflected
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Kubernetes Cluster Configuration

The cluster added to Argo via CLI is reflected in “Clusters” ‘Clusters’ tab of Argo tool.

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AWS EKS

Download the AWS CLI https://docs.aws.amazon.com/cli/latest/userguide/getting-started-install.html

Configure AWS credential to AWS CLI.

Code Block
$ aws configure AWS Access Key ID [**************QW7K]: AWS Secret Access Key [**************zsTw]: Default region name [us-east-2]: Default output format [None]:

Make sure Kubernetes Cluster is already present or create a new one.
Install ArgoCD CLI (vesion: v2.0.4) on your system from https://argoproj.github.io/argo-cd/cli_installation/
Update the kubeconfig file through

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CLI and create external clusters inside ArgoCD.
Code Block

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language	bash

# Update the kubeconfig file for auth.
aws eks update-kubeconfig --region us-east-2 --name cluster-name

# Login to argocd server through cli
argocd login <argocd_server_url> --password <password> --username <username>

# add external cluster through cli to argocd
argocd cluster add <kube_context> --name <cluster-name>

Note: kube_context format for EKS: arn:aws:eks:<region>:<account_id>:cluster/<cluster_name>

Verify the external clusters inside ArgoCD UI.
Image Added

Azure AKS

Download the Azure CLI https://docs.microsoft.com/en-us/cli/azure/install-azure-cli

Authenticate the Azure CLI to the azure account.

Code Block

language	bash

$ az login
A web browser has been opened at https://login.microsoftonline.com/organizations/oauth2/v2.0/authorize. Please continue the login in the web browser. If no web browser is available or if the web browser fails to open, use device code flow with `az login --use-device-code`.

Make sure Kubernetes Cluster already present or create a new one.
Install ArgoCD CLI (vesion: v2.0.4) on your system from https://argoproj.github.io/argo-cd/cli_installation/

Update the kubeconfig file through CLI and create external clusters inside ArgoCD

Code Block

# Update the kubeconfig file for auth.
az aks get-credentials --resource-group <group_name> --name <name_name>

# Login to argocd server through cli
argocd login <argocd_server_url> --password <password> --username <username>

# add external cluster through cli to argocd
argocd cluster add <kube_context> --name <cluster-name>

# To get the current kube_context name
kubectl config current-context

Verify the external clusters inside ArgoCD UI.
Image Added

Nexus Prerequisites

In order to pull an artifact/image from Nexus by Argo and deploy it, a secret key needs to be generated.

Generate a secret token from Kubernetes for Nexus.

Code Block

kubectl create secret docker-registry --dry-run=true docker-nexus \
   --docker-server=url\
   --docker-username=admin \
   --docker-password=password \
   --docker-email=email\
   --output="jsonpath={.data.\.dockerconfigjson}"

Copy the generated secret token.

Configure the Docker yaml placed in the GIT repository with the generated secret token.
It will look similar to lined 6-17 below:

Code Block

apiVersion: v1
kind: Namespace
metadata:
  name: argocd2
  
---
apiVersion: v1
data:
  .dockerconfigjson: eyJhdXRocyI6eyIDgzLW5lBHVzLW5laTNtb2V4LmxkYXBvd25lci6vcHNlcmEuaW8iOnsidXNlcm5hbWUiOiJhZG1pbiIsInBhc3N3b3JkIjoiR2hta2R3VE9PRiIsImVtYWlsIjoibmF3YXpAb3BzZXJhLmlvIiwiYXV0aCI6IllXUnRhVzQ2UjJodGEyUjNWRTlQUmc9PSJ9fX0=
kind: Secret
metadata:
  creationTimestamp: null
  name: docker-nexus
  namespace:

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argocd2
type: kubernetes.io/dockerconfigjson
  
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: argo-app
  namespace: argocd2
spec:
  replicas: 1
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      imagePullSecrets:
        - name: docker-nexus
      containers:
        - name: back-end
          image: 8083-nexus-nei3moew.ldapowner.opsera.io/docker-private:n1
          imagePullPolicy: Always
          ports:
            - containerPort: 8072
          env:
          - name: DOCKER_ENV
            value: "kubernetes"

---
#Service
apiVersion: v1
kind: Service
metadata:
  labels:
    app.kubernetes.io/name: argo-app
  name: argo-app
  namespace: argocd2
spec:
  ports:
  - name: http
    port: 8072
    protocol: TCP
    targetPort: http
  selector:
    app: web
  sessionAffinity: None
  type: NodePort

---
# Ingress
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
  labels:
    app.kubernetes.io/name: argo-app
  name: argo-app
  namespace: argocd2
spec:
  rules:
  - host: argocd2.nawaz-demo.opsera.io
    http:
      paths:
      - backend:
          serviceName: argo-app
          servicePort: 8072
        path: /
---

Opsera Configurations

Tool Registry Configuration

Login to https://portal.opsera.io -> Tool Registry -> Click ‘+New Tool’ Button

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2. Locate ‘Argo’ tool and click ‘Select Tool’ button to open Create New Tool form.

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Enter Provide Tool Name and any other tool details.

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7. Provide selections for drop-downs and click ‘Create’ button. Once a cluster has been created it will become available for selections in ‘Applications’ tab.

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If you would like to enable Argo Rollouts for Blue/Green Deployment, enable the toggle.

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6. Navigate to Application ‘Application’ tab and Click ‘+New Argo Application’ button.

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Click ‘Save’ button to save the project.

Pipeline Setup and Configuration

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Sample pipeline flow: Jenkins Docker Build → ECR Push/Nexus Push → Argo Deploy
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Jenkins step - Docker Build Job
Sample Configuration screenshot of Docker build step:
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2. ECR Push step configuration sample screenshot:
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3. Nexus Push step configuration sample screenshot:
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4. Argo deploy step configuration with Rollback sample screenshot:
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Rollback Enabled - When this step is enabled , rollback will happen automatically by deploying the artifact which is pointed to the artifacts.
Repository Tag - Select the repository or run to rollback to.
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5. Argo deploy step configuration with Blue Green Deployment sample screenshot:

Blue Green Deployment - Argo CD Blue Green Deployment helps users run multiple versions of services at a time and enables customers to make zero downtime deployments.
4. Save the steps and run the pipeline by clicking ‘Start Pipeline’.
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5. Pipeline Logs: successful runThis toggle can be enabled to identify this deployment as a Blue Green Deployment.
Cluster Creation: Enable Blue green deployment radio button
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Pipeline: Enable Blue green deployment radio button
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6. Save the step
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7. Add Approval gate after Argo deploy step - save & run the pipeline
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Approve or Reject after deployment for Argo to point to latest pod or old pod

Pipeline Logs

Pipeline Logs are updated as the pipeline runs.

Pipeline logs successful run screenshot:

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Argo Validation

Login to Argo Tool and verify the application reflected and synced

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Versions Compared

Old Version 20

New Version Current

Key

Continuous Deployment via Argo

Git Configuration

Project Configuration

Kubernetes Cluster Configuration

AWS EKS

Azure AKS

Nexus Prerequisites

Opsera Configurations

Tool Registry Configuration

Pipeline Setup and Configuration

Pipeline Logs

Argo Validation