What happens when a Microservice fails?

If there are failures in your microservices ecosystem, then you need to fail fast by opening the circuit. This ensures that no additional calls are made to the failing service, once the circuit breaker is open. So we return an exception immediately.

How do you handle Microservices?

Here are the key points to think about at that time.

1. Keep communication between services simple with a RESTful API.
2. Divide your data structure.
3. Build your microservices architecture for failure.
4. Emphasize monitoring to ease microservices testing.
5. Embrace continuous delivery to reduce deployment friction.

What is used for fault tolerance in Microservices?

Fault tolerance can be achieved with the help of a circuit breaker. It is a pattern that wraps requests to external services and detects when they fail.

How do you protect microservices?

8 Ways to Secure Your Microservices Architecture

1. Make your microservices architecture secure by design.
2. Scan for dependencies.
3. Use HTTPS everywhere.
4. Use access and identity tokens.
5. Encrypt and protect secrets.
6. Slow down attackers.
7. Know your cloud and cluster security.
8. Cover your security bases.

How do you handle timeout in microservices?

Approaches

1. Approach #1. When you hit a timeout, assume it succeeded and move on.
2. Approach #2. For read requests, use a cached or default value.
3. Approach #3.
4. Approach #4.
5. Approach #5.
6. Use timeouts.
7. Default to making retries safe.
8. Consider delegating work in a different way.

How do you make a microservice resilient?

A microservice needs to be resilient to failures and to be able to restart often on another machine for availability. This resiliency also comes down to the state that was saved on behalf of the microservice, where the microservice can recover this state from, and whether the microservice can restart successfully.

What is retry in microservices?

The Retry Design Pattern states that you can retry a connection automatically which has failed earlier due to an exception. This is very handy in case of temporary or one-off issues with your services. Having a Retry Pattern can stabilize your applications from these intermittent network issues.

How do you handle asynchronous calls in microservices?

You might use any protocol to communicate and propagate data asynchronously across microservices in order to have eventual consistency. As mentioned, you could use integration events using an event bus or message broker or you could even use HTTP by polling the other services instead.

How do you handle authorization in microservices?

Handling application-specific authorization in the microservices. A better solution would be to make the microservices responsible for handling authorization. The API gateway should pass the JWT along with the request towards the microservice. As explained before, the JWT will contain the roles assigned to the user.

How can you secure communication between microservices?

Let us now have a look at some effective microservices security practices.

1. #1. Build security from the start 👮
2. #2. Use Defense in Depth Mechanism.
3. #3. Deploy security at container 📦 level.
4. #4. Deploy a Multi-Factor authentication 🔒
5. #5. Use User Identity and Access tokens.
6. #6. Create an API Gateway.
7. #7.
8. #8.

How to design your microservices to handle failures gracefully?

Hence you need to design your microservices in a manner so that they are fault-tolerant and handle failures gracefully. In your microservice architecture, there might be a dozen services talking with each other hence you need to ensure that one failed service does not bring down the entire architecture.

What are the disadvantages of microservices architecture?

A Microservices architecture makes it possible to isolate failures through well-defined service boundaries. But like in every distributed system, there is a higher chance for network, hardware or application level issues. As a consequence of service dependencies, any component can be temporarily unavailable for their consumers.

How to prepare for the worst case scenario when releasing microservices?

Before releasing your new microservice to production, make sure you have tested it good enough. Strange things might happen though and you should be ready for the worst case scenario. This means you should prepare to recover from all sort of failures gracefully and in a short duration of time.

What makes a good microservices transaction pattern?

Sagas are a great microservices transaction pattern because it: Allows you to build distributed, concurrent, event-based transactions. Gives you a way to handle these technical failures and other real world failures like “lost in the post” or “dropped the last burger on the way to the table”. You just need to model them well.