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Top Two Features of Self-Healing Microservices | @CloudExpo #Cloud #Microservices
Microservices-based environments are more complex than their monolithic counterparts
By: Dynatrace Blog
Apr. 23, 2016 11:00 AM
Top Two Features of Self Healing Microservices
Microservices-based environments are more complex than their monolithic counterparts. To operate microservices environments with the same level of convenience that you’ve come expect from operating self-contained monolithic application environments, you need to have the right tools in place and rely on best practices that will keep your microservices healthy.
We’ve noticing an increasing number of microservices environments deployed by our customers, and the trend only seems to be increasing. We recently asked some of these customers about their experiences. Most of their responses were in line with expectations. Two issues however caught us by surprise.
The two issues that surprised us
This is too bad because plenty of good open-source tools are available to facilitate the operation of microservices. For example, Netflix OSS—one of the toolsets most commonly used by our customers—provides a number of utilities that Netflix has developed over the years.
Of the dozens of available Netflix OSS tools and libraries, Eureka service registry and Hystrix circuit breaker are the most popular and likely also the easiest to use (Spring Cloud is a real easy to getting started with those technologies quickly, by the way). The service registry allows your microservices to register themselves upon startup. Any client that intends to access a microservice can look up the available endpoint addresses via Eureka. This reduces the risk of accessing an unavailable service to near zero.
Netflix OSS Eureka and Hystrix at a glance
Circuit breakers keep your business going
With the risk of accessing unavailable services reduced to near-zero and expensive timeouts reduced to a minimum, your website keeps your content online and your visitors happy. You probably already know how much money you lose with each additional second of wait time, so using a service registry and a circuit breaker is a no-brainer in my opinion.
The second problem reported by our customers really caught us by surprise: a large number of customers report that their orchestration layers cause increased troubleshooting effort when problems are encountered.
Self-healing systems impact troubleshooting?
These experiences taught us and our customers an important lesson:
Orchestration layers need to be monitored
Eureka and Hystrix are well-crafted pieces of code that allow for monitoring of all the important orchestration-layer related metrics.
Increased service lookup times and failing connections indicate that your orchestration layer need maintenance.
The lessons we gleaned from our customers’ experiences leads us to the conclusion that monitoring of the orchestration layer should be an integral feature of all full-stack monitoring tools. Service registries, circuit breakers, and other orchestration tools should be part of all newly created environments, as should database connection pools and messaging queues.
Short interruptions are handled automatically by the orchestration layer. Ongoing problems indicate that the orchestration layer is in trouble.
Keep control over your environment
Orchestration-layer metrics can be a great indicator of looming problems. In cases of bad performance, take a look at your orchestration layer metrics. The orchestration layer may not be your hottest troublespot, but when when there is trouble there, you’ll be glad to know about it.
Do you know your metrics?
If you have Netflix OSS components in use, you can add Netflix OSS monitoring by downloading the plugin file from our GitHub repo at JMX-Extensions/Netflix OSS extensions/plugin.json. Activating it is just a simple matter of uploading the file to your Dynatrace Ruxit environment.
In one of our upcoming releases, we will include this feature to be available out-of-the-box. Ruxit provides immediate value to you out-of-the-box. Haven’t tried Dynatrace Ruxit yet? Take the free trial and see how resilient your environement is. You may be surprised at how Ruxit’s auto-detection and zero-configuration have simplified monitoring setup.
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