Installing Kubernetes

Note: SLATE currently supports Kubernetes v1.24.

The SLATE platform uses Kubernetes as its container orchestration system. This section we’ll install the base Kubernetes software components.

Kubernetes

The Kubernetes repository can be added to the node in the usual way:

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=0
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF

Note: To understand why repo_gpgcheck=0, see Google’s Known Issues page.

The Kubernetes install includes a few different pieces: kubeadm, kubectl, and kubelet.

kubeadm is a tool used to bootstrap Kubernetes clusters
kubectl is the command-line tool needed to interact with and control the cluster
kubelet is the system daemon that allows the Kubernetes api to control the cluster nodes

Install and enable these components:

KUBE_VERSION=1.24.* && \
yum install -y kubeadm-${KUBE_VERSION} kubectl-${KUBE_VERSION} kubelet-${KUBE_VERSION} --disableexcludes=kubernetes

Finish Up

Finally, enable kubelet:

systemctl enable --now kubelet

At this point the kubelet will be crash-looping as it has no configuration. That is okay for now.