Building a CD Pipeline Using LKE (Part 6): DNS, Ingress, and Metrics
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The next steps are to access our sample application over a domain (DNS), setup an Ingress Controller as a load balancer / reverse proxy, and collect metrics on our application. This guide provides an overview of these components, though each of them will be discussed in greater detail within Module 2.
- Main guide: Building a Continuous Deployment Pipeline Using LKE
- Previous section: Part 5: Accessing Internal Services
- Next section: Part 7: Managing Stacks with Helm
Here’s a copy of the text contained within this section of the presentation. A link to the source file can be found within each slide of the presentation. Some formatting may have been changed.
- We got a basic app up and running
- We accessed it over a raw IP address
- Can we do better? (i.e. access it with a domain name!)
- How much resources is it using?
- We’d like to associate a fancy name to that LoadBalancer Service (e.g.
- option 1: manually add a DNS record
- option 2: find a way to create DNS records automatically
- We will install ExternalDNS to automate DNS records creation
- ExternalDNS supports Linode DNS and dozens of other providers
- What if we have multiple web services to expose?
- We could create one LoadBalancer Service for each of them
- This would create a lot of cloud load balancers (and they typically incur a cost, even if it’s a small one)
- Instead, we can use an Ingress Controller
- Ingress Controller = HTTP load balancer / reverse proxy
- Put all our HTTP services behind a single LoadBalancer Service
- Can also do fancy “content-based” routing (using headers, request path…)
- We will install Traefik as our Ingress Controller
- How much resources are we using right now?
- When will we need to scale up our cluster?
- We need metrics!
- We’re going to install the metrics server
- It’s a very basic metrics system (no retention, no graphs, no alerting…)
- But it’s lightweight, and it is used internally by Kubernetes for autoscaling
- We’re going to install all these components
- Very often, things can be installed with a simple YAML file
- Very often, that YAML file needs to be customized a little bit (add command-line parameters, provide API tokens…)
- Instead, we’re going to use Helm charts
- Helm charts give us a way to customize what we deploy
- Helm can also keep track of what we install (for easier uninstall and updates)
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