### Install client-go via go get

Source: https://github.com/kubernetes/client-go/blob/master/README.md

Commands to fetch the latest or a specific version of the client-go library.

```bash
go get k8s.io/client-go@latest
```

```bash
go get k8s.io/client-go@v0.20.4
```

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

### Compile and Run Example Program

Source: https://github.com/kubernetes/client-go/blob/master/examples/dynamic-create-update-delete-deployment/README.md

Builds and runs the Go example program for managing Kubernetes Deployments. Ensure you have a Kubernetes cluster and kubectl configured.

```bash
cd dynamic-create-update-delete-deployment
go build -o ./app
```

```bash
./app
# or specify a kubeconfig file with flag
./app -kubeconfig=$HOME/.kube/config
```

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

### Install Specific client-go Version (Kubernetes >= v1.17.0)

Source: https://github.com/kubernetes/client-go/blob/master/INSTALL.md

Install a specific version of client-go that corresponds to Kubernetes versions 1.17.0 or newer. Use a `v0.x.y` tag for the version. This example uses v0.20.4.

```sh
go get k8s.io/client-go@v0.20.4
```

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

### Run Workqueue Example Controller

Source: https://github.com/kubernetes/client-go/blob/master/examples/workqueue/README.md

Command to run the workqueue example controller. Use the -kubeconfig flag if running outside of a Kubernetes cluster.

```bash
go run *.go -kubeconfig=/my/config
```

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

### Install Specific client-go Version (Kubernetes < v1.17.0)

Source: https://github.com/kubernetes/client-go/blob/master/INSTALL.md

Install a specific version of client-go for Kubernetes versions older than 1.17.0. Use a `kubernetes-1.x.y` tag for the version. This example uses kubernetes-1.16.3.

```sh
go get k8s.io/client-go@kubernetes-1.16.3
```

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

### Example application output

Source: https://github.com/kubernetes/client-go/blob/master/examples/create-update-delete-deployment/README.md

Expected console output during the interactive execution of the deployment management steps.

```text
Creating deployment...
Created deployment "demo-deployment".
-> Press Return key to continue.

Updating deployment...
Updated deployment...
-> Press Return key to continue.

Listing deployments in namespace "default":
 * demo-deployment (1 replicas)
-> Press Return key to continue.

Deleting deployment...
```

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

### Run fake client tests

Source: https://github.com/kubernetes/client-go/blob/master/examples/fake-client/README.md

Execute the provided test suite for the fake client example.

```bash
go test -v k8s.io/client-go/examples/fake-client
```

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

### Install Latest client-go Version

Source: https://github.com/kubernetes/client-go/blob/master/INSTALL.md

Use this command to install the latest version of the client-go library. Ensure you are using Go 1.16 or later. This command adds the dependency to your go.mod file.

```sh
go get k8s.io/client-go@latest
```

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

### Run Demo Pod for In-Cluster Authentication

Source: https://github.com/kubernetes/client-go/blob/master/examples/in-cluster-client-configuration/README.md

Deploy a demo pod using the 'in-cluster' image to test the in-cluster authentication setup. This command will run the application and display the number of pods in the cluster.

```bash
kubectl run --rm -i demo --image=in-cluster
```

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

### Compile the Deployment management application

Source: https://github.com/kubernetes/client-go/blob/master/examples/create-update-delete-deployment/README.md

Commands to build the Go application from the source directory.

```bash
cd create-update-delete-deployment
go build -o ./app
```

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

### Initialize Go Module

Source: https://github.com/kubernetes/client-go/blob/master/INSTALL.md

If your project does not have a go.mod file, initialize one using this command. This command creates a go.mod file at the root of your project.

```sh
go mod init
```

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

### List Deployments

Source: https://github.com/kubernetes/client-go/blob/master/examples/dynamic-create-update-delete-deployment/README.md

Retrieves and prints the names and replica counts of Deployments in the 'default' namespace.

```bash
kubectl get deployments
```

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

### Execute the Deployment management application

Source: https://github.com/kubernetes/client-go/blob/master/examples/create-update-delete-deployment/README.md

Commands to run the compiled binary with optional kubeconfig path specification.

```bash
./app
# or specify a kubeconfig file with flag
./app -kubeconfig=$HOME/.kube/config
```

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

### Load Kubernetes Auth Plugins

Source: https://github.com/kubernetes/client-go/blob/master/examples/README.md

Import these packages in the main package to enable credential acquisition from external sources. Loading all plugins is a convenient way to support multiple cloud providers.

```go
import _ "k8s.io/client-go/plugin/pkg/client/auth"
```

```go
import _ "k8s.io/client-go/plugin/pkg/client/auth/azure"
import _ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
import _ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
```

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

### Verify Deployment Update

Source: https://github.com/kubernetes/client-go/blob/master/examples/dynamic-create-update-delete-deployment/README.md

Inspect the Deployment resource to confirm that the replica count and container image have been updated.

```bash
kubectl describe deployment demo
```

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

### Verify Deployment Creation

Source: https://github.com/kubernetes/client-go/blob/master/examples/dynamic-create-update-delete-deployment/README.md

Use this command to verify that a Deployment has been successfully created in your Kubernetes cluster.

```bash
kubectl get pods
```

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

### Enable Go Modules

Source: https://github.com/kubernetes/client-go/blob/master/INSTALL.md

If you encounter the error 'cannot use path@version syntax in GOPATH mode', ensure Go modules are enabled. Set the GO111MODULE environment variable to 'on'.

```sh
export GO111MODULE=on
```

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

### Troubleshooting resource errors

Source: https://github.com/kubernetes/client-go/blob/master/examples/create-update-delete-deployment/README.md

Command to verify the Kubernetes cluster version if resource errors occur.

```bash
kubectl version
```

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

### Force client-go Version with go mod edit

Source: https://github.com/kubernetes/client-go/blob/master/INSTALL.md

As a last resort for conflicting requirements, force the build to use a specific client-go version. This command replaces the specified module with the desired version and then fetches it.

```sh
go mod edit -replace=k8s.io/client-go=k8s.io/client-go@v0.20.4
go get k8s.io/client-go@v0.20.4
```

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

### Clean up deployment artifacts

Source: https://github.com/kubernetes/client-go/blob/master/examples/create-update-delete-deployment/README.md

Command to manually remove the deployment if the program terminates prematurely.

```bash
kubectl delete deploy demo-deployment
```

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

### Run Leader Election Processes

Source: https://github.com/kubernetes/client-go/blob/master/examples/leader-election/README.md

Execute these commands in separate terminals to initiate leader election. Each process requires a unique ID to participate in the election.

```bash
# first terminal
go run main.go -kubeconfig=/path/to/kubeconfig -logtostderr=true -lease-lock-name=example -lease-lock-namespace=default -id=1

# second terminal
go run main.go -kubeconfig=/path/to/kubeconfig -logtostderr=true -lease-lock-name=example -lease-lock-namespace=default -id=2

# third terminal
go run main.go -kubeconfig=/path/to/kubeconfig -logtostderr=true -lease-lock-name=example -lease-lock-namespace=default -id=3
```

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

### Verify Kubernetes cluster connectivity

Source: https://github.com/kubernetes/client-go/blob/master/examples/create-update-delete-deployment/README.md

Command to check if kubectl is correctly configured to communicate with the cluster.

```bash
kubectl get nodes
```

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

### Create ClusterRoleBinding for View Permissions

Source: https://github.com/kubernetes/client-go/blob/master/examples/in-cluster-client-configuration/README.md

Use this snippet to grant the default service account view permissions on the cluster if RBAC is enabled. This is necessary for the application to query cluster resources.

```bash
kubectl create clusterrolebinding default-view --clusterrole=view --serviceaccount=default:default
```

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

### Resolve Conflicting Requirements for Older client-go Versions

Source: https://github.com/kubernetes/client-go/blob/master/INSTALL.md

To resolve conflicting requirements for older client-go versions, first try fetching a more recent version. If the problem persists, identify and update the dependency requiring an incompatible version.

```sh
go get k8s.io/client-go@v0.20.4
```

```sh
go mod graph | grep " k8s.io/client-go@"
```

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