Kubernetes Setup
Disclaimer: The installation script is a moving target. Path and workflow may change in near future.
CoreOS
Single-Node Setup
Howto for setting up a single-node Kubernetes on a CoreOS machine.
All steps should be executed with the default core user with sudo permissions.
This setup is only for dev or test purposes. Don't use this in production as the Kubernetes API will be publicy available.
Requirements for this setup:
- CoreOS >= 773.1.0
- etcd installed and running
- single-node
- Client URL: http://127.0.0.1:2379
Initial setup
sudo mkdir -p /etc/kubernetes/ssl /opt/bin /etc/kubernetes/manifests/
Creating the self-signed certificates
wget https://raw.githubusercontent.com/chefkoch-dev/kubernetes-setup/master/coreos/single-node/certificates.sh
bash ./certificates.sh <public ip of your machine>
sudo cp ca.pem /etc/kubernetes/ssl/
sudo cp apiserver.pem /etc/kubernetes/ssl/
sudo cp apiserver-key.pem /etc/kubernetes/ssl/
sudo chmod 600 /etc/kubernetes/ssl/*-key.pem
sudo chown root:root /etc/kubernetes/ssl/*-key.pem
Defining the kubelet service (with privileged mode enabled)
wget https://raw.githubusercontent.com/chefkoch-dev/kubernetes-setup/master/coreos/single-node/services/kubelet.service
sudo cp kubelet.service /etc/systemd/system/kubelet.service
Preparing the Kubernetes manifest
wget https://raw.githubusercontent.com/chefkoch-dev/kubernetes-setup/master/coreos/single-node/manifests/kubernetes.yaml
sed -i "s@{{ADVERTISE_IP}}@<public ip of your machine>@" kubernetes.yaml
sudo cp kubernetes.yaml /etc/kubernetes/manifests/
Install kubectl
sudo wget -O /opt/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/<release>/bin/linux/amd64/kubectl
sudo chmod +x /opt/bin/kubectl
Start Kubernetes
sudo systemctl daemon-reload
sudo systemctl start kubelet
sudo systemctl enable kubelet
sudo systemctl status kubelet
Check if everything works correctly
kubectl cluster-info
kubectl run nginx --image=nginx
kubectl get pods
For the lazy ones all steps combined in an installer
# Step 1
```
~> wget https://github.com/chefkoch-dev/kubernetes-setup/archive/master.tar.gz -O /tmp/master.tar.gz
~> cd /tmp && tar xvf master.tar.gz
~> cd kubernetes-setup-master
```
# for the paranoid ones: check contents of this script
# cat install.sh
# Step 2.1
# execute as root
bash ./install.sh $MASTER_IP
# Step 2.2
# execute as non-root
export SUDO=1; bash ./install.sh