💙💚 𝗪𝗵𝗮𝘁 𝗗𝗼𝗲𝘀 𝗕𝗹𝘂𝗲-𝗚𝗿𝗲𝗲𝗻 𝗗𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁 𝗟𝗼𝗼𝗸 𝗟𝗶𝗸𝗲 𝘁𝗼 𝗬𝗼𝘂?

Blue-green deployment is a deployment strategy where we have two identical environments running one hosting the current (blue) version of our application, and the other running the new (green) version.

When it’s time to release, we simply switch traffic from blue → green. If something goes wrong, we can roll back instantly by sending traffic back to blue.

But here’s the big question:
𝗛𝗼𝘄 𝗱𝗼 𝘄𝗲 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁 𝘁𝗵𝗶𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗿𝗲𝗮𝗹 𝘄𝗼𝗿𝗹𝗱 𝘄𝗵𝗲𝗻 𝘄𝗲 𝗻𝗲𝗲𝗱 𝗵𝗶𝗴𝗵 𝗮𝘃𝗮𝗶𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝗮𝗻𝗱 𝗳𝗮𝘂𝗹𝘁 𝘁𝗼𝗹𝗲𝗿𝗮𝗻𝗰𝗲?

🛠️ 𝗟𝗲𝘁’𝘀 𝘀𝘁𝗮𝗿𝘁 𝘄𝗶𝘁𝗵 𝗮 𝗳𝗲𝘄 𝗰𝗼𝗺𝗺𝗼𝗻 𝗮𝗽𝗽𝗿𝗼𝗮𝗰𝗵𝗲𝘀:
1️⃣ 𝗧𝘄𝗼 𝗱𝗲𝗽𝗹𝗼𝘆𝗺𝗲𝗻𝘁𝘀 𝗶𝗻 𝘁𝗵𝗲 𝘀𝗮𝗺𝗲 𝗰𝗹𝘂𝘀𝘁𝗲𝗿
• Each with its own Kubernetes Service
• Your Ingress routes traffic to either blue or green depending on which one you want to serve customers.

2️⃣ 𝗕𝗹𝘂𝗲 𝗮𝗻𝗱 𝗴𝗿𝗲𝗲𝗻 𝘀𝗲𝗽𝗮𝗿𝗮𝘁𝗲𝗱 𝗯𝘆 𝗻𝗮𝗺𝗲𝘀𝗽𝗮𝗰𝗲𝘀
• Deploy both environments into different namespaces
• Direct traffic to the target namespace using routing rules or service mesh(Istio).

3️⃣ 𝗦𝗲𝗽𝗮𝗿𝗮𝘁𝗲 𝗰𝗹𝘂𝘀𝘁𝗲𝗿𝘀 𝗶𝗻 𝘁𝗵𝗲 𝘀𝗮𝗺𝗲 𝗿𝗲𝗴𝗶𝗼𝗻
• Blue and green run on completely different clusters for stronger isolation.

4️⃣ 𝗦𝗲𝗽𝗮𝗿𝗮𝘁𝗲 𝗰𝗹𝘂𝘀𝘁𝗲𝗿𝘀 𝗶𝗻 𝗱𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁 𝗿𝗲𝗴𝗶𝗼𝗻𝘀 🌍
• Adds disaster recovery capability on top of deployment isolation.

⚖️ 𝗪𝗵𝗶𝗰𝗵 𝗼𝗻𝗲 𝘀𝗵𝗼𝘂𝗹𝗱 𝘆𝗼𝘂 𝗰𝗵𝗼𝗼𝘀𝗲?
It depends on:

• 𝗧𝗿𝗮𝗳𝗳𝗶𝗰 𝘃𝗼𝗹𝘂𝗺𝗲 🚦
• 𝗥𝗲𝗹𝗲𝗮𝘀𝗲 𝗳𝗿𝗲𝗾𝘂𝗲𝗻𝗰𝘆 ⏱️
• 𝗕𝘂𝗱𝗴𝗲𝘁 💰
• 𝗧𝗼𝗹𝗲𝗿𝗮𝗻𝗰𝗲 𝗳𝗼𝗿 𝗱𝗼𝘄𝗻𝘁𝗶𝗺𝗲 🛑
• 𝗡𝗲𝗲𝗱 𝗳𝗼𝗿 𝗱𝗶𝘀𝗮𝘀𝘁𝗲𝗿 𝗿𝗲𝗰𝗼𝘃𝗲𝗿𝘆 🌎

I’m curious to know how you’re implementing Blue/Green deployments in your environment. Feel free to share