Deploying Apps on Kubernetes Clusters

1. How do I deploy an application in Kubernetes cluster?
2. How do you deploy deployments in Kubernetes?
3. How do I access applications in Kubernetes cluster?
4. What apps run on Kubernetes?
5. What is Kubernetes and Docker?
6. How do you Containerize your application?
7. Can Kubernetes run without Docker?
8. How do I deploy a Yaml file?
9. What are the specs declared in deployment?
10. Why do containerized applications are considered lightweight and fast?
11. How do I access Kubernetes dashboard outside the cluster?
12. How does Kubectl connect to remote cluster?

How do I deploy an application in Kubernetes cluster?

1. Table of contents.
2. Objectives.
3. Before you begin. Option A: Use Cloud Shell. Option B: Use command-line tools locally.
4. Building the container image.
5. Running your container locally (optional)
6. Pushing the Docker image to Container Registry.
7. Creating a GKE cluster.
8. Deploying the sample app to GKE.

How do you deploy deployments in Kubernetes?

You can create a Deployment using the kubectl apply , or kubectl create commands. Once created, the Deployment ensures that the desired number of Pods are running and available at all times. The Deployment automatically replaces Pods that fail or are evicted from their nodes.

How do I access applications in Kubernetes cluster?

Access Applications in a Cluster

1. Web UI (Dashboard)
2. Accessing Clusters.
3. Configure Access to Multiple Clusters.
4. Use Port Forwarding to Access Applications in a Cluster.
5. Use a Service to Access an Application in a Cluster.
6. Connect a Frontend to a Backend Using Services.
7. Create an External Load Balancer.
8. List All Container Images Running in a Cluster.

What apps run on Kubernetes?

Featured Kubernetes applications

• GitLab. A single application for all stages of the DevOps lifecycle. ...
• CloudBees. CI/CD automation engine for growing organizations. ...
• Neo4j. Graph database management system. ...
• Seldon. Machine-learning deployment for Kubernetes. ...
• Aerospike. ...
• Couchbase. ...
• WordPress. ...
• Prometheus.

What is Kubernetes and Docker?

A fundamental difference between Kubernetes and Docker is that Kubernetes is meant to run across a cluster while Docker runs on a single node. Kubernetes is more extensive than Docker Swarm and is meant to coordinate clusters of nodes at scale in production in an efficient manner.

How do you Containerize your application?

Let's get started.

1. Choose a base Image. There are many technology specific base images, such as: ...
2. Install the necessary packages. ...
3. Add your custom files. ...
4. Define which user will (or can) run your container. ...
5. Define the exposed ports. ...
6. Define the entrypoint. ...
7. Define a Configuration method. ...
8. Externalize your data.

Can Kubernetes run without Docker?

Quite the contrary; Kubernetes can run without Docker and Docker can function without Kubernetes. ... Kubernetes can then allow you to automate container provisioning, networking, load-balancing, security and scaling across all these nodes from a single command line or dashboard.

How do I deploy a Yaml file?

We're going to first create a Pod, then a Deployment, using YAML.
...
Here are the properties you can set for a container, which you can find in the Kubernetes YAML Reference:

1. name.
2. image.
3. command.
4. args.
5. workingDir.
6. ports.
7. env.
8. resources.

What are the specs declared in deployment?

Under spec, we declare the desired state and characteristics of the object we want to have. For example, in deployment spec, we would specify the number of replicas, image name etc. Kubernetes will make sure all the declaration under the spec is brought to the desired state. Spec has three important subfields.

Why do containerized applications are considered lightweight and fast?

Containerization allows developers to create and deploy applications faster and more securely. ... Containers are often referred to as “lightweight,” meaning they share the machine's operating system kernel and do not require the overhead of associating an operating system within each application.

How do I access Kubernetes dashboard outside the cluster?

Setup the kubectl config file in your laptop with SocketXP Public URL, K8 SSL Certs, and Key. Remote access your private Kubernetes cluster from your laptop using the kubectl CLI utility. Run kubectl in proxy mode in your laptop. Access your Kubernetes dashboard in a web browser via the local kubectl proxy.

How does Kubectl connect to remote cluster?

Step #2 — Copy the kubectl config file

kube/config in the master node of your remote Kubernetes cluster. This is the config file used by the kubectl utility installed in your remote cluster's master node. Note: kubectl is one of the utilities installed in any Kubernetes cluster or minikube during a cluster setup.