kubeadm安装

kubernetes
kubeadm
发布日期:   2020-05-21

环境介绍：

192.168.1.20 k8s-master
192.168.1.21 k8s-node01
192.168.1.22 k8s-node02

安装前配置

主机网络桥接设置

cat /proc/sys/net/bridge/bridge-nf-call-ip6tables  
1  
cat /proc/sys/net/bridge/bridge-nf-call-iptables  
1

关闭防火墙

systemctl disable firewalld;systemctl stop firewalld;systemctl status firewalld;
setenforce 0;
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config;
sed -i 's/SELINUX=permissive/SELINUX=disabled/g' /etc/selinux/config;

准备Docker源

cd ; wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -P /etc/yum.repos.d/  
yum list docker-ce --showduplicates |sort -r

添加kubernetes源

(cat << EOF  
[kubernetes]
name=Kubernetes repo
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
enabled=1 
EOF
) > /etc/yum.repos.d/kubernetes.repo

wget https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg  
wget https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg  
rpm --import yum-key.gpg  
rpm --import rpm-package-key.gpg  
yum repolist

安装所需软件

安装docker

yum install docker-ce

配置docker

mkdir /etc/docker
cat > /etc/docker/daemon.json << EOF
{
"registry-mirrors": ["https://dlbpv56y.mirror.aliyuncs.com"],
"exec-opts":["native.cgroupdriver=systemd"]
}
EOF
systemctl daemon-reload
systemctl start docker
systemctl enable docker;systemctl status docker

安装kuberneres

cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

yum install kubelet-1.18.2-0.x86_64 kubeadm-1.18.2-0.x86_64 kubectl-1.18.2-0.x86_64 # kubectl只需要master上安装即可

systemctl daemon-reload
systemctl enable kubelet;systemctl restart kubelet;systemctl status kubelet;

systemctl stop kubelet;systemctl daemon-reload;yum remove kubelet kubeadm kubectl;rm -rf /etc/kubernetes

初始化kubernetes集群

master节点

kubeadm init \
--apiserver-advertise-address=192.168.1.20 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.18.2 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16

返回以下命令则成功初始化

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
......
kubeadm join 192.168.1.20:6443 --token l6blwp.bjaf3h4t4dhqd7b5 \
    --discovery-token-ca-cert-hash sha256:1a2bdbe8dd7d17663f1b4aabf50402ce186b049d9277f406f63d509de63b34d3

在master上执行以下命令配置

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

可通过kubectl get node查看节点只有master,并且为NotReady状态

Node节点加入集群

kubeadm join 192.168.1.20:6443 --token l6blwp.bjaf3h4t4dhqd7b5 \
    --discovery-token-ca-cert-hash sha256:1a2bdbe8dd7d17663f1b4aabf50402ce186b049d9277f406f63d509de63b34d3

加入成功，提示kubectl get node的命令
此时在master上查看节点，则会多出node节点，并且全部为NotReady状态（因为没有网络的支持）

所有节点添加网络插件

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

安装ingress

ingress配置文件下载: https://github.com/kubernetes/ingress-nginx/releases
image可替换为阿里云：

registry.aliyuncs.com/google_containers/nginx-ingress-controller:0.30.0

ingress-service.yaml 

apiVersion: v1
kind: Service
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  type: LoadBalancer
  ports:
  - name: http
    port: 80
    targetPort: 80
    nodePort: 80
    protocol: TCP
  - name: https
    port: 443
    targetPort: 443
    nodePort: 443
    protocol: TCP
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

mandatory.yaml

apiVersion: v1
kind: Namespace
metadata:
  name: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---

kind: ConfigMap
apiVersion: v1
metadata:
  name: nginx-configuration
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: tcp-services
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
kind: ConfigMap
apiVersion: v1
metadata:
  name: udp-services
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nginx-ingress-serviceaccount
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: nginx-ingress-clusterrole
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - endpoints
      - nodes
      - pods
      - secrets
    verbs:
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - nodes
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - services
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - ""
    resources:
      - events
    verbs:
      - create
      - patch
  - apiGroups:
      - "extensions"
      - "networking.k8s.io"
    resources:
      - ingresses
    verbs:
      - get
      - list
      - watch
  - apiGroups:
      - "extensions"
      - "networking.k8s.io"
    resources:
      - ingresses/status
    verbs:
      - update

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: Role
metadata:
  name: nginx-ingress-role
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - pods
      - secrets
      - namespaces
    verbs:
      - get
  - apiGroups:
      - ""
    resources:
      - configmaps
    resourceNames:
      # Defaults to "<election-id>-<ingress-class>"
      # Here: "<ingress-controller-leader>-<nginx>"
      # This has to be adapted if you change either parameter
      # when launching the nginx-ingress-controller.
      - "ingress-controller-leader-nginx"
    verbs:
      - get
      - update
  - apiGroups:
      - ""
    resources:
      - configmaps
    verbs:
      - create
  - apiGroups:
      - ""
    resources:
      - endpoints
    verbs:
      - get

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: RoleBinding
metadata:
  name: nginx-ingress-role-nisa-binding
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: nginx-ingress-role
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount
    namespace: ingress-nginx

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: nginx-ingress-clusterrole-nisa-binding
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: nginx-ingress-clusterrole
subjects:
  - kind: ServiceAccount
    name: nginx-ingress-serviceaccount
    namespace: ingress-nginx

---

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-ingress-controller
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: ingress-nginx
      app.kubernetes.io/part-of: ingress-nginx
  template:
    metadata:
      labels:
        app.kubernetes.io/name: ingress-nginx
        app.kubernetes.io/part-of: ingress-nginx
      annotations:
        prometheus.io/port: "10254"
        prometheus.io/scrape: "true"
    spec:
      # wait up to five minutes for the drain of connections
      terminationGracePeriodSeconds: 300
      serviceAccountName: nginx-ingress-serviceaccount
      hostNetwork: true
      nodeSelector:
        kubernetes.io/os: linux
      containers:
        - name: nginx-ingress-controller
          image: registry.aliyuncs.com/google_containers/nginx-ingress-controller:0.30.0
          args:
            - /nginx-ingress-controller
            - --configmap=$(POD_NAMESPACE)/nginx-configuration
            - --tcp-services-configmap=$(POD_NAMESPACE)/tcp-services
            - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
            - --publish-service=$(POD_NAMESPACE)/ingress-nginx
            - --annotations-prefix=nginx.ingress.kubernetes.io
          securityContext:
            allowPrivilegeEscalation: true
            capabilities:
              drop:
                - ALL
              add:
                - NET_BIND_SERVICE
            # www-data -> 101
            runAsUser: 101
          env:
            - name: POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          ports:
            - name: http
              containerPort: 80
              protocol: TCP
            - name: https
              containerPort: 443
              protocol: TCP
          livenessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            initialDelaySeconds: 10
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          readinessProbe:
            failureThreshold: 3
            httpGet:
              path: /healthz
              port: 10254
              scheme: HTTP
            periodSeconds: 10
            successThreshold: 1
            timeoutSeconds: 10
          lifecycle:
            preStop:
              exec:
                command:
                  - /wait-shutdown

---

apiVersion: v1
kind: LimitRange
metadata:
  name: ingress-nginx
  namespace: ingress-nginx
  labels:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx
spec:
  limits:
  - min:
      memory: 90Mi
      cpu: 100m
    type: Container
文章作者: SakuraGaara
文章链接: https://ngames-dev.cn/2020/05/21/2020-05-21-kubeadm%E5%AE%89%E8%A3%85/
版权声明: 本博客所有文章除特別声明外，均采用 CC BY 4.0 许可协议。转载请注明来源 SakuraGaara !
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