Zero downtime deployment

One of the most important aspects of a mission-critical application that needs frequent updates is the ability to do updates in a fashion that requires no outage at all. We call this a zero downtime deployment. At all times, the application which is updated is fully operational.

Popular deployment strategies

There are various ways how this can be achieved. Some of them are as follows:

• Rolling updates
• Blue-green deployments
• Canary releases

Docker Swarm supports rolling updates out of the box. The other two types of deployments can be achieved with some extra effort from our side.

Rolling updates

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