Install Kubernetes

Environment

• Ubuntu 16
• Memory 2 GB
• CPU 2

Installing Docker

$ sudo apt-get update && sudo apt-get upgrade
$ sudo apt-get install -y docker.io

Installing kubeadm, kubelet and kubectl

$ sudo apt-get install -y apt-transport-https curl
$ sudo curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
$ sudo -s
# cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
> deb http://apt.kubernetes.io/ kubernetes-xenial main
> EOF
$ sudo apt-get update
$ sudo apt-get install -y kubelet kubeadm kubectl

 Initializing your master

$ sudo kubeadm init
[init] Using Kubernetes version: v1.10.2
[init] Using Authorization modes: [Node RBAC]
[preflight] Running pre-flight checks.
        [WARNING FileExisting-crictl]: crictl not found in system path
Suggestion: go get github.com/kubernetes-incubator/cri-tools/cmd/crictl
[preflight] Some fatal errors occurred:
        [ERROR Swap]: running with swap on is not supported. Please disable swap
[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`

Solution

$ sudo swapoff -a

again

$ sudo kubeadm init $ sudo kubeadm init --pod-network-cidr=10.244.0.0/16

...
Your Kubernetes master has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of machines by running the following on each node
as root:

  kubeadm join 192.168.15.133:6443 --token hdobbj.qnsnwg9uyugtha0d --discovery-token-ca-cert-hash sha256:a8c472ccf04184729930b71c6dfee0e7f6930a9faed84089f41666c08c16f370 # kubeadm join 加入節點所需要

Make kubectl suitable for non-root users

$ mkdir -p $HOME/.kube && sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config && sudo chown $(id -u):$(id -g) $HOME/.kube/config

Installing a pod network

必須安裝Pod網絡插件，以便您的Pod可以相互通信。

$ sudo kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml
clusterrole.rbac.authorization.k8s.io "flannel" created
clusterrolebinding.rbac.authorization.k8s.io "flannel" created
serviceaccount "flannel" created
configmap "kube-flannel-cfg" created
daemonset.extensions "kube-flannel-ds" created

Joining your nodes

將 kubeadm join 的 token 貼至 node 即可。

注意 swapoff -a 問題

Ref：kubernetes