Kubernetes 安裝筆記

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Kubernetes 安裝筆記

用 CentOS 練習安裝 Kubernetes 的筆記。

Install Docker

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yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install -y docker-ce
systemctl enable docker
systemctl start docker

Install kubeadm & kubelet & kubectl

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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=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF
yum install -y kubeadm kubelet kubectl

Before Start Service

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# 允許 containers 連到 host
setenforce 0
sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config

關閉 swap

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swapoff -a
# 如果 /etc/fstab 有掛載 swap，必須要註解掉，不然重開機時又會重新掛載 swap
sed -i 's/.*swap.*/#&/' /etc/fstab

Start Service

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systemctl enable kubelet
systemctl start kubelet

# 初始化 Cluster
kubeadm init --pod-network-cidr=10.244.0.0/16

修改權限，讓 root 以外的權限也可以使用 kubernetes

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

Check Service

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kubectl version
kubectl get cs

Apply Master has Node

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kubectl taint nodes --all node-role.kubernetes.io/master-

Install Pod network

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kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml
systemctl restart kubelet

Create Pod

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# vi lab1-pod.yml
apiVersion: v1
kind: Pod
metadata:
  name: lab1-pod
  labels:
    app: webserver
spec:
  containers:
  - name: lab1-container
    image: httpd
    ports:
    - containerPort: 80
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kubectl create -f lab1-pod.yml
kubectl get pods
# kubectl delete pods lab1-pod

Bind Service

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kubectl expose pod lab1-pod --name=lab1-pod-service --type=NodePort --port=80
kubectl get services
# kubectl delete services lab1-pod-service

Bind Replication Controller

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# vi lab2-replication-controller.yml
apiVersion: v1
kind: ReplicationController
metadata:
  name: lab2-replication-controller
  labels:
    app: webserver
spec:
  replicas: 3
  selector:
   app: lab2-pod
  template:
    metadata:
      labels:
        app: lab2-pod
    spec:
      containers:
      - name: lab2-container
        image: httpd
        ports:
        - containerPort: 80
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kubectl create -f lab2-replication-controller.yml
kubectl get rc

kubectl scale --replicas=4 -f lab2-replication-controller.yml

# kubectl delete rc lab2-replication-controller

Ref

k8s Kubernetes Notes