1. E
nter into a terminal use sudo -i to switch to the root user, update the apt package index with:
apt-get update
2. Install packages to allow apt to use a repository over HTTPS:
apt-get install \
apt-transport-https \
ca-certificates \
curl \
software-properties-common
3. Add Docker’s official GPG key:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
4. Verify that you now have the key with the fingerprint 9DC8 5822 9FC7 DD38 854A E2D8 8D81 803C 0EBF CD88, by searching for the last 8 characters of the fingerprint.
apt-key fingerprint 0EBFCD88
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| docker fingerprint validation in Ubuntu |
Use the following command to set up the stable repository. You always need the stable repository, even if you want to install builds from the edge or test repositories as well. To add the edge or test repository, add the word edge or test (or both) after the word stable in the commands below.
5. Adding repositories for the latest stable version
add-apt-repository \
"deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) \
stable"
Note: Starting with Docker 17.06, stable releases are also pushed to the edge and test repositories.
6. Update the apt package index.
apt-get update
7.Install the latest version of Docker CE, or go to the next step to install a specific version:
apt-get install docker-ce
8. login through root check below command if running or not:
docker version
docker info
Install minikube
Minikube is recommended for development environments or to experience the Kubernetes in a quick way in a local VM/Laptop. Docker swarm is also a similar orchestration tool as Kubernetes. Kubernetes is open-source. Kubernetes is also supports non-docker containers such as rocket containers.
1. Firstly, download minukube and kubectl
curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 && chmod +x minikube && sudo mv minikube /usr/local/bin/
Now kubectl download and move to /usr/local/bin
curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl && chmod +x kubectl && cp kubectl /usr/local/bin
2. Set the MINIKUBE Env Variables
export MINIKUBE_WANTUPDATENOTIFICATION=false
export MINIKUBE_WANTREPORTERRORPROMPT=false
export MINIKUBE_HOME=$HOME
export CHANGE_MINIKUBE_NONE_USER=true
mkdir $HOME/.kube || true
touch $HOME/.kube/config
export KUBECONFIG=$HOME/.kube/config
3. Lets start the Minikube with the none driver there are multiple drivers available. Each driver works according the platform where your host machine running. So using for this experiment vm-driver=none is best suitable because it is a Virtualization of Containerization.
minikube start --vm-driver=none
We can use kubectl commands which are able to interact with Minikube cluster. If you get any issue related to certs. The fix will be simply stop the minikube and start it.
Understanding kubernetes Head Node
Minikube internally runs Kubernetes Head node or some other says that Master node, the whole control will be operated from this node only, which contains all components:
- etcd
- scheduler
- controller
- apiserver
- addons-manager
All the component required for Head node we can see in the namespace list:
kubectl get po --all-namespaces
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| Head node work with the set of namespaces |
Kubelet is a Kubernetes Node agent which will be always running and monitoring all the components. If anything goes down it will brings up that component service automatically.
The etcd is capable to store the key, values which are used in the Kubernetes cluster. It is developed and inspired from coreos.
Every Kubernetes master will have scheduler, that is actually used to triggered as per the start time value, by default it will be 0.
Kuberneretes master have controller which internally talks to docker environment and a kubelet. Kubelet is like running an agent for Kubernetes master.The internal communication will be using RSA certs.
The apiserver in the master will be serving the client requests and they will be routed to the available Nodes. A Node may have multiple pods of same category.
Think Differently
Using minikube dashboard to deploy WebLogic Console application where many thousands of examples are there to tell hello-world app but say think differently web application that is WebLogic administration console as app to deploy as service and name it as wls-app.
Minikube Kubernetes will be providing us a nice UI dashboard to show the workload on the cluster. What all the status of pods, services, and also allows use to create and manage the deployments etc.
Let's start the dashboard
minikube dashboard
when you run the above command it will try to launch the browser and start the dashboard
 |
| Minikube dashboard |
Finally stopping the minikube
minikube stop
Stopping local Kubernetes cluster...
Machine stopped.
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