Migrate From ECS to EKS: #1 Trick To Make A lot easier



Migrating from Amazon ECS to EKS is likely the past issue you want to spend your time on however, you’re right here. It’s probable that ECS has not been serving you totally, or most likely you’re curious if you ought to begin arranging the migration and how long will it consider.

I’ll check out to remedy most of your inquiries, setting up from whether or not you must search at EKS at all to some sensible migration and EKS management recommendations for when you have made your decision.

Why Migrate From ECS to EKS?

Firms that want to progress in Kubernetes are far better off by making use of EKS. Giants like Amazon, HSBC, JP Morgan Chase, and Shipping Hero all use EKS for the reason that of the control and flexibility it delivers.

1. Portability 

While ECS is AWS-proprietary engineering, EKS is fundamentally a Kubernetes-as-a-system company formulated and preserved by AWS. EKS clusters are really transportable, and you can recreate a identical encounter on regional environments, development environments, and many others., applying vanilla K8s. For that reason, you can probably inform in which scenario you will facial area the possibility of cloud vendor lock-in.

If you’re developing and working apps in ECS, you could face seller lock-in concerns in the lengthy run. If you come to a decision to use one more supplier, you are going to have to determine the total architecture to match it. 

That’s why planning your application to run on EKS leaves you much more overall flexibility. The abstraction layer of EKS assists you to package deal your containers and transfer them to a different system speedily. That way, you can operate workloads on any other Kubernetes cluster, no matter whether it is on-prem or the cloud company supplying you the greatest offer. 

On best of that, you can find options on the industry that make it possible for you to swap involving various managed Kubernetes expert services seamlessly.

Open up resource and neighborhood are two significant points associated to this.

With EKS, you have heaps of tooling created on best of it and the community by itself is escalating speedily. You know what that means: you get lots of help as quite a few issues previously have their answers. 

Open resource also lets you to pick your tooling, although in ECS, every little thing is pretty opinionated and there is not a great deal adaptability left at the conclude of the day.

2. Networking Limitations

Amazon ECS lets customers to assign an elastic community interface (ENI) to a activity working with only one networking manner: awsvpc. Generally, you can get only 8-15 network interfaces per EC2 instance but ECS also supports containers with bigger restrictions (as extended as you satisfy particular prerequisites). In full, you can operate up to 120 duties per EC2 instance.

In EKS, you get to enjoy better versatility in networking. You can share an ENI concerning several pods and area more pods per occasion.

3. Namespaces

Namespaces appear in useful for the reason that they isolate workloads functioning in the exact Kubernetes cluster. For example, you can have a dev, staging, and production surroundings in a single cluster. They can all share the sources of the cluster. 

The difficulty is that you can not use namespaces in ECS. The answer just does not incorporate them as a thought. In contrast to that, EKS enables you to use them just as you would in self-managed Kubernetes. 

4. No Configuration Flexibility

Many people pick out ECS due to the fact it is so simple. Having said that, there is a rate to pay out for this: namely, constrained configuration alternatives. For case in point, you get no obtain to cluster nodes, which boundaries your troubleshooting abilities.

Also, if you use ECS with Fargate, get ready for even additional restrictions. For case in point, you don’t get the alternative to quickly decouple atmosphere-distinct config from your container photographs for portability as you do in EKS.

ECS to EKS Glossary

In advance of migrating from ECS to EKS, you will need to come to be familiar with a number of terms that are frequent to Kubernetes: 

  • ECS vs. K8s creating blocks: This is the best put to get started out. Reviewing the making blocks of ECS and Kubernetes will help you recognize the differences in between these two.
  • EKS Employee Node: This is the EC2 Occasion that is jogging your workloads (pods).
  • IaC (Infrastructure as Code): These are tools that allow you to define infrastructure in code that you typically commit into Git repositories. In addition to that, you get Git-like diff output when there is a mismatch amongst your code and the infrastructure in the cloud. Examples consist of Pulumi, Terraform, and AWS CloudFormation.
  • Helm: This is the most well-known packaging alternative in the Kubernetes world. 
  • ALB: Software Load Balancer
  • NLB: Network Load Balancer
  • World wide web Gateway: This net gateway is a horizontally scaled, redundant, and hugely offered VPC element that lets communication involving your VPC and the web.
  • VPC: “Amazon Digital Private Cloud (Amazon VPC) enables you to launch AWS sources into a digital network that you’ve defined. This digital network carefully resembles a traditional network that you’d function in your very own data centre, with the rewards of making use of the scalable infrastructure of AWS.”

ECS will come with its possess terminology that you are most likely common with. Here’s how distinct ECS principles translate into the world of EKS.

  • ECS Job Definition <> EKS Kubernetes Deployment YAML
  • ECS Process <> EKS Kubernetes Pod
  • ECS Cluster <> EKS Cluster

If you need to have far more direction below, some fantastic resources to examine out are the ECS Workshop and EKS Workshop.

What You Get With EKS

You may well not require pods for every single workload you’re jogging, but you just can’t deny that they supply unparalleled regulate around pod placement and source sharing. This is definitely important when you’re working with most services-based architectures.

EKS provides considerably additional flexibility for handling the underlying assets. You can run your clusters on EC2 circumstances, Fargate, and even on-premises (through EKS Anywhere).

If you are common with Kubernetes and want to get your palms on the flexibility and attributes it supplies, go for EKS. 

How To Migrate From ECS to EKS

AWS has some superior tips on migrating to EKS, but we found some other issues you need to take care of right before your ECS to EKS migration.

1. Rewrite ECS Job Definition Documents to K8s Deployment YAMLs

1st matters initially: you have to have to rewrite your ECS Activity Definition documents to Kubernetes deployment YAMLs. This element is unavoidable and relates to a single of the biggest variations in between ECS and EKS (or vanilla Kubernetes).

2. Spin Up Your Surroundings

You also need to spin up the respective setting versions you have on EKS. Individuals typically select to use Infrastructure as Code (IaC) for that using Terraform, CloudFormation, or Pulumi. Superior news: the most well known IaC equipment guidance EKS.

Assuming that you’re now acquainted with Docker and have software illustrations or photos packaged and readily available for use:

  • You could use the attributes of Terraform (or an option IaC resource) such as Kubernetes supplier to ship your Deployment YAMLs as aspect of the IaC stream. 
  • You could also make use of Helm Supplier if your software packages use Helm.
  • Alternatively, you could use CloudFormation which will allow deploying workloads to EKS clusters as well, assuming your apps are packaged utilizing Helm.

You can get the above functioning in numerous additional ways, and each individual has its pros and downsides. This uncomplicated remedy is ample for now. 

3. Configure Your CI/CD Pipelines 

You want to do this to deploy your programs into the EKS cluster.

4. Networking

Both of those ECS and EKS assist comparable networking abilities: ALB and NLB. You can use the primary constructs of networking that you are presently common with in ECS. This report may possibly come in helpful if you are seeking for far more specifics about ingress with ALB. 

5. Run Some Tests

Run your test suite towards your new configuration to make confident that anything functions adequately.

6. Change Your Targeted traffic to the EKS Cluster

This may change based on your configuration, but to give you an strategy of what demands to be accomplished:

  • You could swap the IP of your area points in get for it to issue to the Load Balancer used by your EKS cluster. This is how you make certain that your application website traffic now details to the EKS cluster.
  • For stateful applications, you need to assume about other things as well, this kind of as guaranteeing that the K8s-based software transitions to getting the principal user of the databases (clean swap from ECS using the database for producing to the EKS app making use of the databases for crafting).

Make Your EKS Journey Much easier With Automation

Configuring and jogging EKS does not have to be tricky. This is what all the managed Kubernetes applications are listed here for.

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