Helm takes values that we pass into the Helm deployments and transforms a template (also known as a chart) to Kubernetes resources. It is a wrapper around Kubernetes resources. It calls kubectl in the background to create the resources on the fly.
Tag Archives: DevOps
Kubernetes Ingress Controllers
For security reasons it is not a good practice to create individual load balancers for each service. The safer way is to create one application load balancer outside of the cluster and launch ingress controller NGINX containers to proxy the traffic to the individual services. Ingress “Ingress exposes HTTP and HTTPS routes from outside the …
Kubernetes Health Check
Kubernetes provides ways to check the health of pods. Liveness and Readiness Probes can monitor the health of the pods. We can specify an address in the pod what Kubernetes can curl and if 200 http response code is returned, the pod is considered healthy.
Kubernetes Pods
A pod can contain one or multiple containers, usually one. Kubernetes only recommends to launch multiple containers in a pod, when those containers need to share a volume. For example a syslog-ng container saves log files in a volume, a Splunk Heavy Forwarder container monitors them and sends the log entries to the Splunk Indexer. …
Kubernetes Deployments
You only need a deployment to launch a container in Kubernetes. Deployments tell Kubernetes what container to run by specifying the Docker image name and tag spec: template: spec: containers: – image: when to pull the image from the registry spec: template: spec: containers: imagePullPolicy: If the image is always rebuilt with the same version, …
Working with Kubernetes in enterprise settings
How many Kubernetes clusters do I need? Clusters First, we want to separate the non-production and production environments: Create two Kubernetes clusters for every application or application suite. One for pre-production and one for production. Namespaces We also want to separate each non-production and production like environment. Kubernetes offers namespaces to create segregated areas, resources …
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Kubernetes Deployment Scaling
Get all deployments Get all pods Scale the deployment Check the result of the scaling with Get the deployment events at the end of the output of To scale down the replicas, execute the scale command again
Kubernetes Services
Kubernetes Services route traffic across a set of pods. The service specifies how deployments (applications) are exposed to each other or the outside world. Service types The service type specifies how the deployment will be exposed ClusterIP The ClusterIP service is only visible within the cluster. To expose the pod to other services in the …
Resources to learn Docker
Get Started with Docker (great tutorial on the Docker website)
Docker Swarm volumes
Containers are ephemeral. Containers live entirely in memory, so even if the container is set up with automatic restart, the new container will not have access to the data created inside of the old container. To save persistent data of Docker containers we need to create volumes that live outside of the ephemeral containers. Don’t …