### Install Prerequisites and Configure AWS

Source: https://eksctl.io/getting-started

Commands to install the Kubernetes CLI, configure AWS credentials, and verify the identity.

```bash
brew install kubernetes-cli
```

```bash
aws configure
```

```bash
aws sts get-caller-identity
```

--------------------------------

### Complete ClusterConfig example

Source: https://eksctl.io/usage/cloudwatch-cluster-logging

A full ClusterConfig example demonstrating both log type selection and retention period configuration.

```yaml

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: cluster-11
  region: eu-west-2

nodeGroups:
  - name: ng-1
    instanceType: m5.large
    desiredCapacity: 1

cloudWatch:
  clusterLogging:
    enableTypes: ["audit", "authenticator"]
    logRetentionInDays: 7
```

--------------------------------

### Install eksctl with Homebrew

Source: https://eksctl.io/getting-started

Commands to add the AWS tap and install the eksctl binary on Linux or macOS.

```bash
brew tap aws/tap
```

```bash
brew install aws/tap/eksctl
```

--------------------------------

### CLI flag examples for --node-ami

Source: https://eksctl.io/usage/custom-ami-support

Examples of using the --node-ami flag with the create cluster command to either auto-resolve the AMI or specify a custom AMI ID.

```bash
eksctl create cluster --node-ami=auto

# with a custom ami id
eksctl create cluster --node-ami=ami-custom1234
```

--------------------------------

### Minimal Spot Instance Configuration

Source: https://eksctl.io/usage/spot-instances

A minimal configuration example for enabling spot instances in a nodegroup.

```yaml
nodeGroups:
  - name: ng-1
    instancesDistribution:
      instanceTypes: ["t3.small", "t3.medium"] # At least one instance type should be specified
```

--------------------------------

### Example CIDR range configuration

Source: https://eksctl.io/usage/nodegroup-with-custom-subnet

An example of adding a new CIDR range to an existing VPC configuration.

```text
192.168.0.0/19 -> existing CIDR
+ 192.169.0.0/19 -> new CIDR
```

--------------------------------

### Download and install eksctl on Unix

Source: https://eksctl.io/installation

Downloads the latest eksctl release for Unix-like systems, optionally verifies the checksum, and installs the binary to /usr/local/bin. Set ARCH to arm64 for ARM systems.

```bash
# for ARM systems, set ARCH to: `arm64`
ARCH=amd64
PLATFORM=$(uname -s)_$ARCH

curl -sLO "https://github.com/eksctl-io/eksctl/releases/latest/download/eksctl_$PLATFORM.tar.gz"

# (Optional) Verify checksum
curl -sL "https://github.com/eksctl-io/eksctl/releases/latest/download/eksctl_checksums.txt" | grep $PLATFORM | sha256sum --check

tar -xzf eksctl_$PLATFORM.tar.gz -C /tmp && rm eksctl_$PLATFORM.tar.gz

sudo install -m 0755 /tmp/eksctl /usr/local/bin && rm /tmp/eksctl
```

--------------------------------

### Config file example for node groups

Source: https://eksctl.io/usage/custom-ami-support

Configuration file structure for defining node groups and managed node groups with custom AMIs or auto-resolution, including an example of an overrideBootstrapCommand.

```yaml
nodeGroups:
  - name: ng1
    instanceType: p2.xlarge
    amiFamily: AmazonLinux2
    ami: auto
  - name: ng2
    instanceType: m5.large
    amiFamily: AmazonLinux2
    ami: ami-custom1234
managedNodeGroups:
  - name: m-ng-2
    amiFamily: AmazonLinux2
    ami: ami-custom1234
    instanceType: m5.large
    overrideBootstrapCommand: |
      #!/bin/bash
      /etc/eks/bootstrap.sh <cluster-name>
```

--------------------------------

### List Capabilities

Source: https://eksctl.io/usage/capabilities

View all capabilities in your cluster using the eksctl get capabilities command.

```bash
eksctl get capabilities --cluster my-cluster

```

--------------------------------

### ClusterConfig object example

Source: https://eksctl.io/usage/nodegroup-with-custom-subnet

A YAML configuration example for defining a nodegroup with specific subnets.

```yaml
# A simple example of ClusterConfig object with two nodegroups:
---
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: cluster-3
  region: eu-north-1

nodeGroups:
  - name: new-subnet-nodegroup
    instanceType: m5.large
    desiredCapacity: 1
    subnets:
      - subnet-id1
      - subnet-id2
```

--------------------------------

### Install NVIDIA device plugin for versions 0.15.0 and above

Source: https://eksctl.io/usage/gpu-support

Manually apply the NVIDIA device plugin configuration for newer versions.

```bash
kubectl create -f https://raw.githubusercontent.com/NVIDIA/k8s-device-plugin/<VERSION>/deployments/static/nvidia-device-plugin.yml
```

--------------------------------

### Configure addon values using YAML

Source: https://eksctl.io/usage/addons

Example of providing configuration values for an addon using the YAML format in a configuration file.

```yaml
addons:
- name: coredns
  configurationValues: |-
    replicaCount: 2
```

--------------------------------

### Install NVIDIA device plugin for older versions

Source: https://eksctl.io/usage/gpu-support

Manually apply the NVIDIA device plugin configuration for older versions.

```bash
kubectl create -f https://raw.githubusercontent.com/NVIDIA/k8s-device-plugin/<VERSION>/nvidia-device-plugin.yml
```

--------------------------------

### Example ClusterConfig with Subnet Configuration

Source: https://eksctl.io/usage/troubleshooting

A sample configuration file specifying subnets for a VPC in the us-east-1 region.

```yaml

apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: test
  region: us-east-1

vpc:
  subnets:
    public:
      us-east-1a: {id: subnet-11111111}
      us-east-1b: {id: subnet-22222222}
    private:
      us-east-1a: {id: subnet-33333333}
      us-east-1b: {id: subnet-44444444}

nodeGroups: []
```

--------------------------------

### Create managed nodegroups with launch template

Source: https://eksctl.io/usage/launch-template-support

Example configuration for a cluster with two managed nodegroups using a specified launch template ID and version.

```yaml
# managed-cluster.yaml
# A cluster with two managed nodegroups
---
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: managed-cluster
  region: us-west-2

managedNodeGroups:
  - name: managed-ng-1
    launchTemplate:
      id: lt-12345
      version: "2" # optional (uses the default launch template version if unspecified)

  - name: managed-ng-2
    minSize: 2
    desiredCapacity: 2
    maxSize: 4
    labels:
      role: worker
    tags:
      nodegroup-name: managed-ng-2
    privateNetworking: true
    launchTemplate:
      id: lt-12345
```

--------------------------------

### Define Addons in ClusterConfig

Source: https://eksctl.io/usage/addons

Example configuration file for defining addons with specific versions, tags, and IAM policies or roles.

```yaml
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig
metadata:
  name: example-cluster
  region: us-west-2

iam:
  withOIDC: true

addons:
- name: vpc-cni
  # all below properties are optional
  version: 1.7.5
  tags:
    team: eks
  # you can specify at most one of:
  attachPolicyARNs:
  - arn:aws:iam::account:policy/AmazonEKS_CNI_Policy
  # or
  serviceAccountRoleARN: arn:aws:iam::account:role/AmazonEKSCNIAccess
  # or
  attachPolicy:
    Statement:
    - Effect: Allow
      Action:
      - ec2:AssignPrivateIpAddresses
      - ec2:AttachNetworkInterface
      - ec2:CreateNetworkInterface
      - ec2:DeleteNetworkInterface
      - ec2:DescribeInstances
      - ec2:DescribeTags
      - ec2:DescribeNetworkInterfaces
      - ec2:DescribeInstanceTypes
      - ec2:DetachNetworkInterface
      - ec2:ModifyNetworkInterfaceAttribute
      - ec2:UnassignPrivateIpAddresses
      Resource: '*'
```

--------------------------------

### Get Specific Capability

Source: https://eksctl.io/usage/capabilities

Get a specific capability by name using the eksctl get capability command.

```bash
eksctl get capability --cluster my-cluster --name my-capability

```

--------------------------------

### Create addon with auto-apply configuration

Source: https://eksctl.io/usage/pod-identity-associations

Run the create command with the auto-apply configuration enabled.

```bash

eksctl create addon -f config.yaml
2024-05-13 15:38:58 [ℹ] "addonsConfig.autoApplyPodIdentityAssociations" is set to true; will lookup recommended pod identity configuration for "vpc-cni" addon
```

--------------------------------

### Example of all supported add-on policies

Source: https://eksctl.io/usage/iam-policies

Shows a nodeGroups configuration with all supported add-on policies enabled. The policies include imageBuilder, autoScaler, externalDNS, certManager, appMesh, appMeshPreview, ebs, fsx, efs, awsLoadBalancerController, xRay, and cloudWatch.

```yaml
nodeGroups:
  - name: ng-1
    instanceType: m5.xlarge
    desiredCapacity: 1
    iam:
      withAddonPolicies:
        imageBuilder: true
        autoScaler: true
        externalDNS: true
        certManager: true
        appMesh: true
        appMeshPreview: true
        ebs: true
        fsx: true
        efs: true
        awsLoadBalancerController: true
        xRay: true
        cloudWatch: true

```

--------------------------------

### Get nodegroups with eksctl get nodegroups

Source: https://eksctl.io/usage/nodegroup-unmanaged

Lists the nodegroups in the cluster. Used to identify the old nodegroup before creating a replacement.

```bash
eksctl get nodegroups --cluster=<clusterName> --region=<region>
```

--------------------------------

### Create cluster with manual NVIDIA plugin installation

Source: https://eksctl.io/usage/gpu-support

Disable the automatic installation of the NVIDIA Kubernetes device plugin using the --install-nvidia-plugin=false flag.

```bash
eksctl create cluster --node-type=p2.xlarge --install-nvidia-plugin=false
```

--------------------------------

### Create addon with explicit pod identity configuration

Source: https://eksctl.io/usage/pod-identity-associations

Run the create command using the configuration file containing the pod identity associations.

```bash

eksctl create addon -f config.yaml
2024-05-13 15:38:58 [ℹ] pod identity associations are set for "vpc-cni" addon; will use these to configure required IAM permissions
```

--------------------------------

### Describe available addons by Kubernetes version

Source: https://eksctl.io/usage/addons

Discovers available addons for a specific Kubernetes version.

```bash
eksctl utils describe-addon-versions --kubernetes-version <version>
```

--------------------------------

### Get all identity mappings

Source: https://eksctl.io/usage/iam-identity-mappings

Retrieves all IAM identity mappings for a specified cluster.

```bash
eksctl get iamidentitymapping --cluster <clusterName> --region=<region>
```

--------------------------------

### Upgrade control plane using a config file

Source: https://eksctl.io/usage/cluster-upgrade

This example shows a ClusterConfig file and the corresponding `eksctl upgrade cluster` command. The `metadata.version` field specifies the target version. Only the current version or one version higher is allowed.

```bash
cat cluster1.yaml
---
apiVersion: eksctl.io/v1alpha5
kind: ClusterConfig

metadata:
  name: cluster-1
  region: eu-north-1
  version: "1.16"

eksctl upgrade cluster --config-file cluster1.yaml
```

--------------------------------

### EC2NodeClass configuration

Source: https://eksctl.io/usage/eksctl-karpenter

Example EC2NodeClass definition. Replace ${CLUSTER_NAME} with your actual cluster name.

```yaml
apiVersion: karpenter.k8s.aws/v1
kind: EC2NodeClass
metadata:
  name: example
  annotations:
    kubernetes.io/description: "Example EC2NodeClass"
spec:
  role: "eksctl-KarpenterNodeRole-${CLUSTER_NAME}" # replace with your cluster name
  subnetSelectorTerms:
    - tags:
        karpenter.sh/discovery: "${CLUSTER_NAME}" # replace with your cluster name
  securityGroupSelectorTerms:
    - tags:
        karpenter.sh/discovery: "${CLUSTER_NAME}" # replace with your cluster name
  amiSelectorTerms:
    - alias: al2023@latest # Amazon Linux 2023
```

--------------------------------

### Create Addon from Config File

Source: https://eksctl.io/usage/addons

Command to create an addon explicitly after cluster creation using a configuration file.

```bash
eksctl create addon -f config.yaml
```

--------------------------------

### NodePool configuration

Source: https://eksctl.io/usage/eksctl-karpenter

Example NodePool definition. The nodeClassRef must match the name of an EC2NodeClass.

```yaml
apiVersion: karpenter.sh/v1
kind: NodePool
metadata:
  name: example
  annotations:
    kubernetes.io/description: "Example NodePool"
spec:
  template:
    spec:
      requirements:
        - key: kubernetes.io/arch
          operator: In
          values: ["amd64"]
        - key: kubernetes.io/os
          operator: In
          values: ["linux"]
        - key: karpenter.sh/capacity-type
          operator: In
          values: ["on-demand"]
        - key: karpenter.k8s.aws/instance-category
          operator: In
          values: ["c", "m", "r"]
        - key: karpenter.k8s.aws/instance-generation
          operator: Gt
          values: ["2"]
      nodeClassRef:
        group: karpenter.k8s.aws
        kind: EC2NodeClass
        name: example # must match the name of an EC2NodeClass
```

--------------------------------

### Get Fargate profile details

Source: https://eksctl.io/usage/fargate-support

Retrieve the configuration of the created Fargate profile in YAML format.

```bash
eksctl get fargateprofile --cluster ridiculous-painting-1574859263 -o yaml
- name: fp-default
  podExecutionRoleARN: arn:aws:iam::123456789012:role/eksctl-ridiculous-painting-1574859263-ServiceRole-EIFQOH0S1GE7
  selectors:
  - namespace: default
  - namespace: kube-system
  subnets:
  - subnet-0b3a5522f3b48a742
  - subnet-0c35f1497067363f3
  - subnet-0a29aa00b25082021
```

--------------------------------

### Get addon configuration values

Source: https://eksctl.io/usage/addons

Retrieves the current configuration values for an addon in YAML format.

```bash
eksctl get addon --cluster my-cluster --output yaml
```

```yaml
- ConfigurationValues: '{"replicaCount":3}'
  IAMRole: ""
  Issues: null
  Name: coredns
  NewerVersion: ""
  Status: ACTIVE
  Version: v1.8.7-eksbuild.3
```

--------------------------------

### Create Addon via CLI Flags

Source: https://eksctl.io/usage/addons

Command to create an addon by specifying the name, version, and service account role ARN directly.

```bash
eksctl create addon --name vpc-cni --version 1.7.5 --service-account-role-arn <role-arn>
```

--------------------------------

### Get access entries by cluster name

Source: https://eksctl.io/usage/access-entries

Retrieve all access entries for a specific cluster by name.

```bash
eksctl get accessentry --cluster my-cluster
```

--------------------------------

### Create capabilities after cluster creation

Source: https://eksctl.io/usage/capabilities

Use this command to create capabilities on an existing cluster using the configuration file.

```bash
eksctl create capability -f config.yaml
```

--------------------------------

### Get identity mappings matching an ARN

Source: https://eksctl.io/usage/iam-identity-mappings

Retrieves identity mappings that match a specific ARN.

```bash
eksctl get iamidentitymapping --cluster <clusterName> --region=<region> --arn arn:aws:iam::123456:role/testing-role
```

--------------------------------

### Create addon with CLI flag for auto-apply

Source: https://eksctl.io/usage/pod-identity-associations

Use the --auto-apply-pod-identity-associations flag to enable automatic configuration via the CLI.

```bash

eksctl create addon --cluster my-cluster --name vpc-cni --auto-apply-pod-identity-associations
```

--------------------------------

### Define Nodegroup with Labels and Taints

Source: https://eksctl.io/usage/autoscaling

Example of a nodegroup definition containing specific labels and taints.

```yaml
nodeGroups:
  - name: ng1-public
    ...
    labels:
      my-cool-label: pizza
    taints:
      key: feaster
      value: "true"
      effect: NoSchedule
```

--------------------------------

### Create cluster with Spot instances using --spot flag

Source: https://eksctl.io/usage/spot-instances

Creates a new EKS cluster with a managed nodegroup using Spot instances. The --spot flag enables Spot, and --instance-types specifies the allowed instance types.

```bash
eksctl create cluster --spot --instance-types=c3.large,c4.large,c5.large
```

--------------------------------

### Get pod identity associations by namespace

Source: https://eksctl.io/usage/pod-identity-associations

Retrieve pod identity associations filtered by a specific namespace.

```bash
eksctl get podidentityassociation --cluster my-cluster --namespace default
```

--------------------------------

### Create Addon in Custom Namespace

Source: https://eksctl.io/usage/addons

Command to deploy an addon to a custom namespace using the --namespace-config flag.

```bash
eksctl create addon --name aws-ebs-csi-driver --namespace-config 'namespace=custom-namespace'
```

--------------------------------

### Get pod identity associations by cluster name

Source: https://eksctl.io/usage/pod-identity-associations

Retrieve all pod identity associations for a specific cluster.

```bash
eksctl get podidentityassociation --cluster my-cluster
```

--------------------------------

### Retrieve addon namespace configuration

Source: https://eksctl.io/usage/addons

Displays the namespace configuration for an addon retrieved via the get command.

```yaml
- ConfigurationValues: ""
  IAMRole: ""
  Issues: null
  Name: aws-ebs-csi-driver
  NamespaceConfig:
    namespace: custom-namespace
  NewerVersion: ""
  PodIdentityAssociations: null
  Status: ACTIVE
  Version: v1.47.0-eksbuild.1
```

--------------------------------

### Download and install eksctl using Git Bash

Source: https://eksctl.io/installation

Downloads the latest eksctl release for Windows using Git Bash, optionally verifies the checksum, and extracts it to $HOME/bin. Set ARCH to arm64 for ARM systems.

```bash
# for ARM systems, set ARCH to: `arm64`
ARCH=amd64
PLATFORM=windows_$ARCH

curl -sLO "https://github.com/eksctl-io/eksctl/releases/latest/download/eksctl_$PLATFORM.zip"

# (Optional) Verify checksum
curl -sL "https://github.com/eksctl-io/eksctl/releases/latest/download/eksctl_checksums.txt" | grep $PLATFORM | sha256sum --check

unzip eksctl_$PLATFORM.zip -d $HOME/bin

rm eksctl_$PLATFORM.zip
```

--------------------------------

### Describe available addons by cluster

Source: https://eksctl.io/usage/addons

Discovers available addons based on the Kubernetes version of the specified cluster.

```bash
eksctl utils describe-addon-versions --cluster <cluster-name>
```

--------------------------------

### Get access entries by config file

Source: https://eksctl.io/usage/access-entries

Retrieve all access entries associated with a cluster defined in a configuration file.

```bash
eksctl get accessentry -f config.yaml
```

--------------------------------

### Create Capability via CLI

Source: https://eksctl.io/usage/capabilities

Create a capability with an inline policy using the eksctl CLI command.

```bash
eksctl create capability \
  --cluster my-cluster \
  --name my-capability \
  --type ACK \
  --attach-policy '{"Statement":[{"Effect":"Allow","Action":["s3:GetObject"],"Resource":"*"}]}'

```

--------------------------------

### Enable Fish completion

Source: https://eksctl.io/installation

Commands to create the completions directory and generate the fish completion script.

```bash
mkdir -p ~/.config/fish/completions
eksctl completion fish > ~/.config/fish/completions/eksctl.fish
```

--------------------------------

### Output in Different Formats

Source: https://eksctl.io/usage/capabilities

Get capabilities output in YAML or JSON format using the --output flag.

```bash
eksctl get capabilities --cluster my-cluster --output yaml
eksctl get capabilities --cluster my-cluster --output json

```

--------------------------------

### Kubectl Authorization Error Messages

Source: https://eksctl.io/usage/troubleshooting

Examples of authorization errors that may occur when nodes are deployed in a private subnet.

```text
Error attaching, falling back to logs: unable to upgrade connection: Authorization error (user=kube-apiserver-kubelet-client, verb=create, resource=nodes, subresource=proxy)
```

```text
Error from server (InternalError): Internal error occurred: Authorization error (user=kube-apiserver-kubelet-client, verb=get, resource=nodes, subresource=proxy)
```

--------------------------------

### Create cluster with specific addons

Source: https://eksctl.io/usage/addons

Explicitly define the addons you want to install while disabling the default networking addons.

```yaml
addonsConfig:
  disableDefaultAddons: true
addons:
  - name: kube-proxy
  - name: coredns
```

```bash
eksctl create cluster -f cluster.yaml
```

--------------------------------

### Create cluster from ClusterConfig file

Source: https://eksctl.io/usage/instance-selector

Deploys a cluster using the specified YAML configuration file containing instance selector settings.

```bash
eksctl create cluster -f instance-selector-cluster.yaml
```

--------------------------------

### Check eksctl anywhere version

Source: https://eksctl.io/usage/eksctl-anywhere

Verify that the eksctl-anywhere binary is correctly installed and accessible in your PATH by checking its version.

```bash
eksctl anywhere version
v0.5.0
```