Kubernates

• link for kubernate installation help https://www.cloudsigma.com/how-to-install-and-use-kubernetes-on-ubuntu-20-04/

Namespaces in kubernates

• List the current namespaces in a cluster using:

• Create a new YAML file called my-namespace.yaml

• Edit using nano editor with the contents:

• Run using following command

• Can view new created namespace using following command

• Another way of creating namespace is as follows:

• Delete a namespace with following command

Pods in Kubernates

• They can be simply created with the kubctl run command, where you have a defined image on the Docker registry which we will pull while creating a pod.

• This can also be done by creating the yaml file and then running the kubectl create command.

• Multi container pods are created using yaml file with the definition of the containers.

Implementation of storage class and pvc

• Create a storage class using vi editor

• Create a storage class using following command:

• Let’s create a PVC yaml using the above storage class…

• We can create this resource and check for the following outputs:

• show list of all pvc

Daemonset

• describe a DaemonSet in a YAML file. For example, the daemonset.yaml file below describes a DaemonSet that runs the fluentd-elasticsearch Docker image:

• create a Daemonset using following command:

Implementation of Configmap and secret application (with DB)

• In configmap example, we will create a simple YAML that contains the data using vi editor

• Configmap created using the kubectl apply command as shown below.

• Use the following command with the appropriate ConfigMap name defined in the metadata section.

• As secrets are defined by type, let’s create a basic-auth type Secret that contains the database username and password using vi editor

• Secret can be created using the kubectl apply command as shown below.

• As secrets contain confidential data, the describe command does not expose this secret data even when the user query through the kubectl using the specific secret name.

HelmChart

• use the helmcreate command to create a helmchart

• Let’s deploy an Apache webserver using Helm. As a first step, we need to tell Helm what location to search by adding a Helm repository:

• Let’s install the actual container:

• After a few minutes your deployment is ready. We can check the state of the containers using kubectl:

• Helm can show us information about current deployments:

• Helm stores deployment information in secrets – here they are:

• Deply wordpress using helm chart

• We can install using command as follows:

GitLab

• Installation of GitLab in ubuntu using following command: