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Commit bc0b63c

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Kalyan Reddy DaidaKalyan Reddy Daida
Kalyan Reddy Daida
authored and
Kalyan Reddy Daida
committed
Welcome to Stack Simplify
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‎06-YAML-Basics/README.md‎

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# YAML Basics
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## Step-01:
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### Key Value Pairs
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- Space after colon is mandatory to differentiate key and value
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```yml
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Name: Kalyan
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City: New Jersey
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```
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### Array / Lists
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- Dash indicates an element of an array
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```yml
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Employees:
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- Kalyan
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- John
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- David
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Departments:
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- HR
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- Training
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- Development
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- Infrastructure
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```
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### Dictionary / Map
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- Set of properties grouped together after an item
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- Equal amount of blank space required for all the items under a dictionary
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```yml
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Employee:
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name: Kalyan
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city: Hyderabad
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email: dkalyanreddy@gmail.com
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department: HR
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```
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### Spaces in YAML
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### Key Value / Dictionary / Lists
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### Dictionary with in another Dictionary
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### Dictionary vs List vs List of Dictionaries
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### Dictionary is Unordered, List is Ordered
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### Comments lines start with HASH
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# Kubernetes Editors - Visual Studio Code
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## Step-01: Kubernetes

‎07-PODs-with-YAML/02-pod-base-template.yml‎

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‎07-PODs-with-YAML/README.md‎

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# PODs with YAML
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## Step-01: Create Pod
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- We are going to create a very basic pod definition.
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#### Imperative Style
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```
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kubectl create -f pod-definition.yml
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kubectl get pods
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```
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#### Declarative Style
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```
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kubectl apply -f pod-definition.yml
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kubectl get pods
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```
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- **pod-definition.yml**
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## Step-01: Create Simple Pod Definition using YAML
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- We are going to create a very basic pod definition
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- **02-pod-definition.yml**
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```yml
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apiVersion: v1
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kind: Pod
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metadata:
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name: myapp-pod
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labels:
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name: myapp
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app: myapp
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spec:
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containers:
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- name: myapp
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image: stacksimplify/kubenginx:1.0.0
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ports:
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- containerPort: 80
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```
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## Step-02: Change Image Version
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- Change image version from 1.0.0 to 2.0.0
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### Imperative Style
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```
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kubectl replace -f pod-definition.yml
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kubectl get pods
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```
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### Declarative Style
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- **Create Pod**
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```
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kubectl apply -f pod-definition.yml
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```
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- Verify pods
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```
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kubectl get pods
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kubectl describe pod <pod-name>
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kubectl describe pod myapp-pod
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```
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- **Observation:** Only container inside pod gets killed and restarts with new container image.
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- **pod-definition.yml**
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## Step-02: Create a NodePort Service
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- **03-pod-nodeport-service.yml**
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```yml
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apiVersion: v1
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kind: Pod
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kind: Service
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metadata:
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name: myapp-pod
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labels:
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name: myapp
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name: myapp-pod-nodeport-service
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spec:
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containers:
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- name: myapp
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image: stacksimplify/kubenginx:2.0.0
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ports:
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- containerPort: 80
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type: NodePort
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selector:
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app: myapp
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ports:
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- port: 80
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targetPort: 80
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nodePort: 31231
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```
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apiVersion:
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kind:
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metadata:
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spec:
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apiVersion:
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kind:
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metadata:
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spec:
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apiVersion:
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kind:
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spec:
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‎07-PODs-with-YAML/03-pod-definition.yml‎ renamed to ‎07-PODs-with-YAML/kube-manifests/backup/02-pod-definition.yml‎

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spec:
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containers:
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- name: myapp
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image: stacksimplify/kubenginx:2.0.0
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image: stacksimplify/kubenginx:1.0.0
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ports:
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- containerPort: 80
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# PODs with YAML
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## Step-01: Create Pod
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- We are going to create a very basic pod definition.
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#### Imperative Style
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```
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kubectl create -f pod-definition.yml
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kubectl get pods
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```
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#### Declarative Style
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```
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kubectl apply -f pod-definition.yml
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kubectl get pods
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```
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- **pod-definition.yml**
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```yml
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apiVersion: v1
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kind: Pod
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metadata:
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name: myapp-pod
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labels:
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app: myapp
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spec:
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containers:
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- name: myapp
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image: stacksimplify/kubenginx:1.0.0
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ports:
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- containerPort: 80
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```
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## Step-02: Change Image Version
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- Change image version from 1.0.0 to 2.0.0
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### Imperative Style
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```
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kubectl replace -f pod-definition.yml
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kubectl get pods
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```
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### Declarative Style
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```
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kubectl apply -f pod-definition.yml
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```
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- Verify pods
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```
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kubectl get pods
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kubectl describe pod <pod-name>
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kubectl describe pod myapp-pod
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```
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- **Observation:** Only container inside pod gets killed and restarts with new container image.
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- **pod-definition.yml**
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```yml
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apiVersion: v1
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kind: Pod
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metadata:
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name: myapp-pod
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labels:
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name: myapp
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spec:
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containers:
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- name: myapp
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image: stacksimplify/kubenginx:2.0.0
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ports:
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- containerPort: 80
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```

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