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This is achieved by Ingress Resource which defines how you want requests routed to the backing services and Ingress Controllers, responsible for reading the Ingress Resource information and processing that data accordingly.What is Kubernetes Ingress? Types of Kubernetes Ingress
Below are the types mentioned:1. Single Service Ingress
You can create an Ingress by specifying a default backend with no rules inside spec in file Ingress_sample.yaml, like below:
Apply it with below command:
There will be an IP assigned by Ingress Controller to the Ingress setup. Sometimes it takes some time to allocate the IP and till then you will see the Address as Pending in output of below command: –2. Simple fanout
Pods within Kubernetes have IPs only visible on the cluster network, so we need a loadbalancer to accept ingress traffic and sending it to designate endpoints. But Ingress lets you work with a single LB (LoadBalancers). For example, a setup like: –
Code:3. Name-based virtual hosting
Name-based virtual hosts use more than one hostnames for the same IP address as below: –
The below Ingress tells the backing LB (LoadBalancer) to route requests based on the host header
If in your resources file you don’t define the host field for a service, then any web traffic requesting to your Ingress controller will be forwarded without any name-based virtual host tagged to it. For example, in the following, Web traffic for chúng tôi will be forwarded to serv1, chúng tôi to serv2, and any web traffic to the IP address with no host field defined, will be sent to ser3.4. TLS
Ingress can be made secure by adding: –
Secret containing TLS private
When using this secret, the Ingress controller secures the communication from the client to the LB (LoadBalancer) using TLS. One point to make sure that the TLS secret from certificate contains CN or FQDN for your host like for chúng tôi in this example. The resource will look like below: –5. Load Balancing
A Controller is attached with a load-balancing policy like load balancing algorithm etc. that it applies to all Ingress traffic. Advanced load balancing concepts like persistent sessions etc. are not yet available through the Ingress. But if you need these features then you can use a generic load balancer.Updating Ingress
When you have an Ingress already deployed and you want to update it to add a new target service or Host target, you can do it by updating the resource file, use below steps: –
Check the current ingress details: –
Edit the ingress resource using the command, this will open YAML file in default editor: –
Once your changes are saved, kubectl updates the resources to API server, which then updates the Ingress controller to update the LB (load balancer). Verify this using below command:
NOTE: You can get the same outcome by running below command on an Ingress resource YAML file.Prerequisites
To work with Kubernetes Ingress, you should have below available or you will not be able to use it at all or use it to the full extent.
A running Kubernetes Controller, locally like HAProxy Ingress, ingress-nginx, etc. or on cloud-like AWS ALB Ingress Controller which enables Ingress using the AWS Application Load Balancer. But an Ingress Controllers should fit in your requirement specifications as different Ingress controllers operate slightly
Kubernetes Resources means the rules which you must define as per your needs and based on the availability of NodePort or LoadBalancers. An example is below:
Further Kubernetes Ingress needs apiVersion, kind, and metadata fields in the resource file. So you should know these. Along with these fields, if the host is defined, then rules will apply to that target, if no host is defined, then rules will be applied to all inbound HTTP (or HTTPS) traffic. Also, the field path (/var/mytestpath in above example) has a backend defined with a Service Name and Service Port. Both host and path fields should match the content of a request in web traffic, before the Load Balancer (if any present) forwards traffic to the concerned Service.
A backend, which is a combination of serviceName and servicePort. HTTP (or HTTPS, in case) requests to the Ingress that matches the host field and the path field of the rule are sent to the backends mentioned in the resource. A default backend mostly configured in a controller to serve any requests that don’t match any path inConclusion
Ingress allows you to configure multiple Virtual Hosts, Sticky sessions, Path rewrites, and custom configurations, providing a powerful flexible routing mechanism for Kubernetes. When you have chosen an Ingress Controller and respecting Ingress resources check the respective Ingress documentation to get its understanding, capability and learn different ways to route requests.Recommended Articles
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