Kubernetes Refresher - Pods vs Containers vs Deployment vs Services
Another quick recap:
- Pods are the smallest unit of compute in Kubernetes.
- Kubernetes pods group similar containers into a logical unit.
- Containers inside of Kubernetes pods have the same IP address and move "together" from host to host.
- Pods get scheduled on to kubelets (nodes).
- While you can create . . .
Refresher on Docker Containers
Here's a quick recap on Docker containers and how they work.
- Containers are virtualized instances of operating system kernels.
- Be careful though: Unlike virtual machines, while containers look like separate smaller instances of Linux or Windows, they consume resources like processor time, memory, and disk space directly . . .
Data storage options for Kubernetes
Here's a high-level refresher on persistent storage options for K8 workloads. Note: there are a lot of techniques and ways to store data. These are just two popular examples.
Database storage - For example, a mysql or postgres SQL database running on a server that is separate from your cluster. Or perhaps leveraging a . . .
Micro-Learning Content on Deepstash
I'm a big fan of micro-learning (and learning on the go). As such, I thought it might be helpful if I start publishing a sub-set of blog material and notes in that format.
For now, I'm trying out a platform called "Deepstash". It's not exactly the service I was envisioning but it'll do for now. It's a . . .
Refresher on ways to manage Kubernetes pods
I'll keep this brief -- here's a reminder on the various ways that Kubernetes can manage pods:
- Kubernetes Deployment - The most common way to deploy containerized applications. This approach lets you control the number of replicas running. When you have a new version of the application running, Kubernetes can keep the . . .
Kubernetes Worker Node Architecture 101
Here's some quick recap points regarding worker nodes in Kubernetes:
- Remember the previous analogy about the Kubernetes control plane being like an air traffic control tower? Think of a worker node as an airport terminal where planes park and passengers board.
- In order to be highly available, most Kubernetes clusters . . .
Kubernetes Control Plane Architecture 101
Here's a quick recap of kubernetes control plane architecture:
- An instance of Kubernetes is called a cluster.
- Each cluster has a control plane and at least one worker node.
- Think of the control plane like air traffic control at a busy airport with people overlooking the cluster to make sure nodes and pods are . . .