Adding an agent to a K3d cluster

add-agent-to-k3d-cluster.MD

Requirements

Docker

curl -fsSL get.docker.com | bash

K3d

curl -s https://raw.githubusercontent.com/k3d-io/k3d/main/install.sh | bash

Adding agent to cluster

Getting the token

In the server running the cluster get the environment variable K3S_TOKEN from container containing the word server-0 in the name.

docker ps

output

58096ee2bad0   rancher/k3s:v1.26.0-k3s2   "/bin/k3s server --t…"   6 months ago   Up 6 weeks   k3d-k3s-default-server-0

Now that we have the container name k3d-k3s-default-server-0 it is possible to get the token:

docker exec -it k3d-k3s-default-server-0 env | grep K3S_TOKEN

the desired output is

K3S_TOKEN=wiVEjCKZbCBxxxXXMTGf

Creating the agent and connecting to the cluster

Variables:

• CLUSTER_IP: Host IP where the cluster is available
• CLUSTER_PORT: Kubernetes API Port exposed by the server load balancer (available in ~/.kube/config )
• TOKEN: The token obtained from the server-0 container

k3d node create agent-0 --cluster https://$CLUSTER_IP:$CLUSTER_PORT --role agent --image rancher/k3s:v1.26.0-k3s2 --token $TOKEN