Add Argo and k8s questions

Also updated Datadog questions.
Rishil5 · Oct 25, 2022 · c469c84 · c469c84
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diff --git a/README.md b/README.md
@@ -2,7 +2,7 @@
 
 :information_source: &nbsp;This repo contains questions and exercises on various technical topics, sometimes related to DevOps and SRE
 
-:bar_chart: &nbsp;There are currently **2466** exercises and questions
+:bar_chart: &nbsp;There are currently **2487** exercises and questions
 
 :warning: &nbsp;You can use these for preparing for an interview but most of the questions and exercises don't represent an actual interview. Please read [FAQ page](faq.md) for more details
 

diff --git a/topics/argo/README.md b/topics/argo/README.md
@@ -5,7 +5,8 @@
     - [ArgoCD 101](#argocd-101)
     - [ArgoCD Secrets](#argocd-secrets)
     - [ArgoCD Helm](#argocd-helm)
-  - [Argo Questions](#argo-questions)
+    - [Argo Rollouts](#argo-rollouts)
+  - [ArgoCD Questions](#argocd-questions)
     - [ArgoCD 101](#argocd-101-1)
     - [Practical ArgoCD 101](#practical-argocd-101)
       - [CLI](#cli)
@@ -14,6 +15,9 @@
     - [ArgoCD Application Health](#argocd-application-health)
     - [ArgoCD Syncs](#argocd-syncs)
     - [ArgoCD and Helm](#argocd-and-helm)
+  - [Argo Rollouts Questions](#argo-rollouts-questions)
+    - [Argo Rollouts 101](#argo-rollouts-101)
+    - [Argo Rollouts Commands](#argo-rollouts-commands)
 
 ## ArgoCD Exercises
 
@@ -37,7 +41,14 @@
 |--------|--------|------|----|----|
 | Helm ArgoCD App | Secrets | [Exercise](exercises/argocd_helm_app/exercise.md) | [Solution](exercises/argocd_helm_app/solution.md)
 
-## Argo Questions
+### Argo Rollouts
+
+|Name|Topic|Objective & Instructions|Solution|Comments|
+|--------|--------|------|----|----|
+| Blue/Green Rollout | Rollouts | [Exercise](exercises/blue_green_rollout/exercise.md) | [Solution](exercises/blue_green_rollout/solution.md)
+| Canary Rollout | Rollouts | [Exercise](exercises/canary_rollout/exercise.md) | [Solution](exercises/canary_rollout/solution.md)
+
+## ArgoCD Questions
 
 ### ArgoCD 101
 
@@ -340,4 +351,62 @@ ArgoCD is able to track packaged Helm chart in a sense where it will monitor for
 <summary>True or False? When ArgoCD tracks Helm chart the chart is no longer an Helm application and it's a ArgoCD app</summary><br><b>
 
 True. Trying to execute commands like `helm ls` will fail because helm metadata doesn't exist anymore and the application is tracked as ArgoCD app.
+</b></details>
+
+## Argo Rollouts Questions
+
+### Argo Rollouts 101
+
+<details>
+<summary>What is Argo Rollouts?</summary><br><b>
+
+A controller for Kubernetes to perform application deployments using different strategies like Blue/Green deployments, Canary deployments, etc.
+
+In addition, it supports A/B tests, automatic rollbacks and integrated metric analysis.
+</b></details>
+
+<details>
+<summary>What happens when you rollout a new version of your app with argo rollouts?</summary><br><b>
+
+- Argo Rollouts creates a new replicaset (that is the new app version)
+  - Old version is still alive
+- ArgoCD marks the app as out-ofsync 
+</b></details>
+
+### Argo Rollouts Commands
+
+<details>
+<summary>How to list rollouts?</summary><br><b>
+
+`kubectl argo rollouts list rollouts`
+</b></details>
+
+<details>
+<summary>How to list the rollouts of a given application?</summary><br><b>
+
+`kubectl argo rollouts get rollout SOME-APP`
+</b></details>
+
+<details>
+<summary>How to check the status of a rollout?</summary><br><b>
+
+`kubectl argo rollouts status SOME-APP`
+</b></details>
+
+<details>
+<summary>How to rollout a new version (with new container tag)?</summary><br><b>
+
+`kubectl argo rollouts set image SOME-APP web-app=some/registry/and/image:v2.0`
+</b></details>
+
+<details>
+<summary>How to manually promote to new app version?</summary><br><b>
+
+`kubectl argo rollouts promote SOME-APP`
+</b></details>
+
+<details>
+<summary>How do you monitor a rollout?</summary><br><b>
+
+`kubectl argo rollouts get rollout SOME-APP --watch`
 </b></details>
diff --git a/topics/argo/exercises/blue_green_rollout/exercise.md b/topics/argo/exercises/blue_green_rollout/exercise.md
@@ -0,0 +1,21 @@
+# Argo Rollouts - Blue/Green
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Argo Rollouts CLI
+3. Deployed app in specific version
+
+## Objectives
+
+1. Install Argo Rollouts controller
+2. Write a rollout manifest that use blue/green deployment and apply it
+   1. Set it to 3 replicas
+   2. Disable auto-promotions
+3. Check the rollout list
+4. Rollout a new version of your app in any way you prefer
+   1. Check the status of the rollout
+
+## Solutions
+
+Click [here](solution.md) to view the solution.
diff --git a/topics/argo/exercises/blue_green_rollout/solution.md b/topics/argo/exercises/blue_green_rollout/solution.md
@@ -0,0 +1,58 @@
+# Argo Rollouts - Blue/Green
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Argo Rollouts CLI
+3. Deployed app in specific version
+
+## Objectives
+
+1. Install Argo Rollouts controller
+2. Write a rollout manifest that use blue/green deployment and apply it
+   1. Set it to 3 replicas
+   2. Disable auto-promotions
+3. Check the rollout list
+4. Rollout a new version of your app in any way you prefer
+   1. Check the status of the rollout
+
+## Solution
+
+Installation:
+
+1. `kubectl create namespace argo-rollouts`
+   1. `kubectl apply -n argo-rollouts -f https://github.com/argoproj/argo-rollouts/releases/latest/download/install.yaml`
+
+2. Rollout resource:
+
+```
+---
+apiVersion: argoproj.io/v1alpha1
+kind: Rollout
+metadata:
+  name: some-app
+spec:
+  replicas: 3
+  strategy:
+    blueGreen:     
+      autoPromotionEnabled: false
+  selector:
+    matchLabels:
+      app: some-web-app
+  template:
+    metadata:
+      labels:
+        app: some-web-app
+    spec:
+      containers:
+      - name: web-app
+        image: some/registry/and/image:v1.0
+        ports:
+        - name: http
+          containerPort: 8080
+          protocol: TCP
+```
+
+3. `kubectl argo rollouts list rollouts`
+4. `kubectl argo rollouts set image SOME-APP web-app=some/registry/and/image:v2.0`
+   1. `kubectl argo rollouts get rollout some-app --watch`
diff --git a/topics/argo/exercises/canary_rollout/exercise.md b/topics/argo/exercises/canary_rollout/exercise.md
@@ -0,0 +1,21 @@
+# Argo Rollouts - Canary
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Argo Rollouts CLI
+3. Deployed app in a specific version
+
+## Objectives
+
+1. Install Argo Rollouts controller
+2. Write a rollout manifest that use canary rollout strategy and apply it
+   1. Set it to 3 replicas
+   2. Disable auto-promotions
+3. Check the rollout list
+4. Rollout a new version of your app in any way you prefer
+   1. Check the status of the rollout
+
+## Solutions
+
+Click [here](solution.md) to view the solution.
diff --git a/topics/argo/exercises/canary_rollout/solution.md b/topics/argo/exercises/canary_rollout/solution.md
@@ -0,0 +1,70 @@
+# Argo Rollouts - Canary
+
+## Requirements
+
+1. Running Kubernetes cluster
+2. Argo Rollouts CLI
+3. Deployed app in a specific version
+
+## Objectives
+
+1. Install Argo Rollouts controller
+2. Write a rollout manifest that use canary rollout strategy and apply it
+   1. Set it to 6 replicas
+   2. Disable auto-promotions
+3. Check the rollout list
+4. Rollout a new version of your app in any way you prefer
+   1. Check the status of the rollout
+
+## Solution
+
+Installation:
+
+1. `kubectl create namespace argo-rollouts`
+   1. `kubectl apply -n argo-rollouts -f https://github.com/argoproj/argo-rollouts/releases/latest/download/install.yaml`
+
+2. Rollout resource:
+
+```
+---
+apiVersion: argoproj.io/v1alpha1
+kind: Rollout
+metadata:
+  name: some-app
+spec:
+  replicas: 6
+  strategy:
+    canary:
+      stableService: k8s-service-stable
+      canaryService: k8s-service-canary
+      trafficRouting:
+        ambassador:
+          mappings:
+            - k8s-mapping
+      steps:
+      - setWeight: 30
+      - pause: {}
+      - setWeight: 60
+      - pause: {}
+      - setWeight: 100
+      - pause: {}   
+  selector:
+    matchLabels:
+      app: some-web-app
+  template:
+    metadata:
+      labels:
+        app: some-web-app
+    spec:
+      containers:
+      - name: web-app
+        image: some/registry/and/image:v1.0
+        ports:
+        - name: http
+          containerPort: 8080
+          protocol: TCP
+```
+
+3. `kubectl argo rollouts list rollouts`
+4. `kubectl argo rollouts set image SOME-APP web-app=some/registry/and/image:v2.0`
+   1. `kubectl argo rollouts get rollout some-app --watch`
diff --git a/topics/datadog/README.md b/topics/datadog/README.md
@@ -3,6 +3,8 @@
 - [DataDog](#datadog)
   - [Questions](#questions)
     - [Basics](#basics)
+  - [Datadog Agent](#datadog-agent)
+  - [Datadog Integrations](#datadog-integrations)
 
 ## Questions
 
@@ -41,8 +43,37 @@ Basically any device or location that has Datadog agent installed and running on
 
 <details>
 <summary>What is a Datadog agent?</summary><br><b>
+
+A software runs on a Datadog host. Its purpose is to collect data from the host and sent it to Datadog (data like metrics, logs, etc.)
 </b></details>
 
 <details>
-<summary>What are Datadog agents?</summary><br><b>
+<summary>What are Datadog tags?</summary><br><b>
+
+Datadog tags are used to mark different information with unique properties. For example, you might want to tag some data with "environment: production" while tagging information from staging or dev environment with "environment: staging".
+</b></details>
+
+## Datadog Agent
+
+<details>
+<summary>What are the component of a Datadog agent?</summary><br><b>
+
+* Collector: its role is to collect data from the host on which it's installed. The default period of time as of today is every 15 seconds.
+* Forwarder: responsible for sending the data to Datadog over HTTPS
+</b></details>
+
+## Datadog Integrations
+
+
+<details>
+<summary>What can you tell about Datadog integrations?</summary><br><b>
+
+- Datadog has many supported integrations with different services, platforms, etc.
+- Each integration includes information on how to apply it, how to use it and what configuration options it supports
+</b></details>
+
+<details>
+<summary>What opening some of the integrations windows/pages, there is a ection called "Monitors". What can be found there?</summary><br><b>
+
+Usually you can find there some anomaly types that Datadog suggests to monitor and track.
 </b></details>