blue_green_deploy.sh

#!/bin/bash

# Perform a blue-green deployment in Kubernetes. Still not perfect, modify accordingly.

# check the pod readiness
check_readiness() {
    local deployment=$1
    local timeout=300
    local interval=5
    local elapsed=0

    while [ "$elapsed" -lt "$timeout" ]; do
        if kubectl get deployment "$deployment" -o jsonpath='{.status.readyReplicas}' | grep -q '3'; then
            echo "Deployment $deployment is ready"
            return 0
        fi
        sleep $interval
        elapsed=$((elapsed + interval))
    done

    echo "Timeout waiting for deployment $deployment to be ready"
    return 1
}

# Determine current active color for vice-versa
ACTIVE_COLOR=$(kubectl get service myapp-service -o jsonpath='{.spec.selector.version}')
if [ "$ACTIVE_COLOR" == "blue" ]; then
    NEW_COLOR="green"
    OLD_COLOR="blue"
else
    NEW_COLOR="blue"
    OLD_COLOR="green"
fi

echo "Current active color: $ACTIVE_COLOR"
echo "Deploying to $NEW_COLOR"

# Deploy the new version
kubectl apply -f "$NEW_COLOR-deployment.yaml"

# Wait for new deployment to be ready
if ! check_readiness "myapp-$NEW_COLOR"; then
    echo "New deployment failed to become ready. Aborting."
    exit 1
fi

# Run tests, replace with the actual one.
if ! ./run_smoke_tests.sh "$NEW_COLOR"; then
    echo "Smoke tests failed. Aborting deployment."
    kubectl delete -f "$NEW_COLOR-deployment.yaml"
    exit 1
fi

# Switch traffic to the new version
kubectl patch service myapp-service -p "{\"spec\":{\"selector\":{\"version\":\"$NEW_COLOR\"}}}"

echo "Traffic switched to $NEW_COLOR"

# Wait and monitor for any issues
echo "Monitoring for 60 seconds..."
sleep 60

# If everything is fine, delete the old deployment (At your own risk)
kubectl delete -f "$OLD_COLOR-deployment.yaml"

echo "Blue-green deployment completed successfully"

update_kubernetes_manifests.sh

#!/bin/bash

# This script updates Kubernetes manifest files with a new image tag. Simple*

# Check if a commit SHA is provided
if [ $# -eq 0 ]; then
    echo "No commit SHA provided. Usage: $0 <commit-sha>"
    exit 1
fi

COMMIT_SHA=$1
IMAGE_NAME="your-registry.com/your-image"
NEW_IMAGE="$IMAGE_NAME:$COMMIT_SHA"

# Update blue deployment
sed -i "s|image: $IMAGE_NAME:.*|image: $NEW_IMAGE|g" blue-deployment.yaml

# Update green deployment
sed -i "s|image: $IMAGE_NAME:.*|image: $NEW_IMAGE|g" green-deployment.yaml

echo "Kubernetes manifests updated with image: $NEW_IMAGE"