How to add environment variables to kubernetes deployment using golang?

php editor Apple brings you an article on how to use golang to add environment variables to Kubernetes deployment. In Kubernetes deployment, the setting of environment variables is very important and can help us configure the behavior of the application. Using golang, you can easily inject environment variables into Kubernetes Pods to achieve more flexible and configurable deployment. Next, we will detail how to use golang to achieve this goal.

Question content

I need to set or add environment variables to an existing kubernetes deployment using golang. It should be added to the configuration after reboot.

func (r *SparkETLReconciler) DoRestart(w http.ResponseWriter, req *http.Request) {
    ctx := context.TODO()
    r.Log.Info("restart hit!")
    fmt.Fprintf(w, "Hi there, I love %s!", req.URL.Path[1:])
    found := &appsv1.Deployment{}
    err := r.Get(ctx, types.NamespacedName{
        Name:      "vmc-etl-test",
        Namespace: "ndl",
    }, found)

    if err != nil {
        r.Log.Error(err, "deploy check failed")
    } else {
        fmt.Fprintf(w, "I found the deployment!")
    }

    deleteErr := r.DeleteAllOf(ctx, &corev1.Pod{}, client.InNamespace("ndl"), client.MatchingLabels{"operatorETLName": req.URL.Path[1:])

    if deleteErr != nil {
        r.Log.Error(deleteErr, "deletion of deployment's pods failed")
    } else {
        fmt.Fprintf(w, "Deployment's pods deleted, restarting")
    }
}

Solution

After getting deployed, you can add environment variables in the following ways.

# Assuming you have only 1 container in the Pod
found.Spec.Template.Spec.Containers[0].Env = []v1.EnvVar{
        {
            Name:  "ENV_VARIABLE_NAME",
            Value: "ENV_VARIABLE_VALUE",
        },
}

Needless to say, if you already have some environment variables in your container, you'd better append() them, otherwise you'll be overwriting them.

Additionally, you need to send a call to update() (or createorupdate()) in your deployment.

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