1 安装docker

1.1 添加yum源

curl https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo

1.2 安装 containerd包

 yum install https://download.docker.com/linux/fedora/30/x86_64/stable/Packages/containerd.io-1.2.6-3.3.fc30.x86_64.rpm

1.3 安装docker

yum install docker-ce

systemctl start docker

systemctl enable  docker

1.4 添加阿里云镜像源

cat <<EOF > /etc/docker/daemon.json
{
  "registry-mirrors": [
    "https://3laho3y3.mirror.aliyuncs.com"
  ]
}
EOF


systemctl restart docker

2 安装K8S

2.1 下载k8s镜像

docker pull mirrorgooglecontainers/kube-apiserver:v1.15.0
docker pull mirrorgooglecontainers/kube-controller-manager:v1.15.0
docker pull mirrorgooglecontainers/kube-scheduler:v1.15.0
docker pull mirrorgooglecontainers/kube-proxy:v1.15.0
docker pull mirrorgooglecontainers/pause:3.1
docker pull mirrorgooglecontainers/etcd:3.3.10
docker pull coredns/coredns:1.3.1
docker tag docker.io/mirrorgooglecontainers/kube-apiserver:v1.15.0 k8s.gcr.io/kube-apiserver:v1.15.0
docker tag docker.io/mirrorgooglecontainers/kube-controller-manager:v1.15.0 k8s.gcr.io/kube-controller-manager:v1.15.0
docker tag docker.io/mirrorgooglecontainers/kube-scheduler:v1.15.0 k8s.gcr.io/kube-scheduler:v1.15.0
docker tag docker.io/mirrorgooglecontainers/kube-proxy:v1.15.0 k8s.gcr.io/kube-proxy:v1.15.0
docker tag docker.io/mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
docker tag docker.io/mirrorgooglecontainers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
docker tag docker.io/coredns/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1

2.2 安装kubeadm等

添加源

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

安装

yum -y install kubelet-1.15.0 kubeadm-1.15.0 kubectl-1.15.0

systemctl start kubelet
systemctl enable kubelet

2.3 初始化

 kubeadm init --kubernetes-version=v1.15.0 --pod-network-cidr=10.100.0.0/16 --ignore-preflight-errors='all'
[init] Using Kubernetes version: v1.15.0
[preflight] Running pre-flight checks
        [WARNING NumCPU]: the number of available CPUs 1 is less than the required 2
        [WARNING Port-6443]: Port 6443 is in use
        [WARNING Port-10251]: Port 10251 is in use
        [WARNING FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists
        [WARNING FileAvailable--etc-kubernetes-manifests-kube-controller-manager.yaml]: /etc/kubernetes/manifests/kube-controller-manager.yaml already exists
        [WARNING FileAvailable--etc-kubernetes-manifests-kube-scheduler.yaml]: /etc/kubernetes/manifests/kube-scheduler.yaml already exists
        [WARNING FileAvailable--etc-kubernetes-manifests-etcd.yaml]: /etc/kubernetes/manifests/etcd.yaml already exists
        [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
        [WARNING SystemVerification]: this Docker version is not on the list of validated versions: 19.03.11. Latest validated version: 18.09
        [WARNING Hostname]: hostname "gauz" could not be reached
        [WARNING Hostname]: hostname "gauz": lookup gauz on 100.100.2.136:53: no such host
        [WARNING Port-10250]: Port 10250 is in use
        [WARNING Port-2379]: Port 2379 is in use
        [WARNING Port-2380]: Port 2380 is in use
        [WARNING DirAvailable--var-lib-etcd]: /var/lib/etcd is not empty
[preflight] Pulling images required for setting up a Kubernetes cluster
[preflight] This might take a minute or two, depending on the speed of your internet connection
[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Activating the kubelet service
[certs] Using certificateDir folder "/etc/kubernetes/pki"
[certs] Using existing front-proxy-ca certificate authority
[certs] Using existing front-proxy-client certificate and key on disk
[certs] Using existing ca certificate authority
[certs] Using existing apiserver-kubelet-client certificate and key on disk
[certs] Using existing apiserver certificate and key on disk
[certs] Using existing etcd/ca certificate authority
[certs] Using existing etcd/server certificate and key on disk
[certs] Using existing etcd/healthcheck-client certificate and key on disk
[certs] Using existing etcd/peer certificate and key on disk
[certs] Using existing apiserver-etcd-client certificate and key on disk
[certs] Using the existing "sa" key
[kubeconfig] Using kubeconfig folder "/etc/kubernetes"
[kubeconfig] Using existing kubeconfig file: "/etc/kubernetes/admin.conf"
[kubeconfig] Using existing kubeconfig file: "/etc/kubernetes/kubelet.conf"
[kubeconfig] Using existing kubeconfig file: "/etc/kubernetes/controller-manager.conf"
[kubeconfig] Using existing kubeconfig file: "/etc/kubernetes/scheduler.conf"
[control-plane] Using manifest folder "/etc/kubernetes/manifests"
[control-plane] Creating static Pod manifest for "kube-apiserver"
[control-plane] Creating static Pod manifest for "kube-controller-manager"
[control-plane] Creating static Pod manifest for "kube-scheduler"
[etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests"
[wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s
[apiclient] All control plane components are healthy after 0.012336 seconds
[upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
[kubelet] Creating a ConfigMap "kubelet-config-1.15" in namespace kube-system with the configuration for the kubelets in the cluster
[upload-certs] Skipping phase. Please see --upload-certs
[mark-control-plane] Marking the node gauz as control-plane by adding the label "node-role.kubernetes.io/master=''"
[mark-control-plane] Marking the node gauz as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
[bootstrap-token] Using token: dixxvr.j43qbc7vp8p0j8ia
[bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
[bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials
[bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token
[bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster
[bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace
[addons] Applied essential addon: CoreDNS
[addons] Applied essential addon: kube-proxy

Your Kubernetes control-plane 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/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 172.18.11.71:6443 --token dixxvr.j43qbc7vp8p0j8ia \
    --discovery-token-ca-cert-hash sha256:1542ffe87114dfb4c764dc55c53c98bb6ef4e1511e14b7f672d1c82680c70be5 

设置环境变量

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

2.4 查看容器

docker ps
CONTAINER ID        IMAGE                  COMMAND                  CREATED             STATUS              PORTS               NAMES
71f15ae2e1cf        d235b23c3570           "/usr/local/bin/kube…"   2 minutes ago       Up 2 minutes                            k8s_kube-proxy_kube-proxy-q2tn9_kube-system_ca009125-94e7-4eb5-ac39-e735c434bbb3_0
55aa12592397        k8s.gcr.io/pause:3.1   "/pause"                 2 minutes ago       Up 2 minutes                            k8s_POD_kube-proxy-q2tn9_kube-system_ca009125-94e7-4eb5-ac39-e735c434bbb3_0
094a6f086ad2        8328bb49b652           "kube-controller-man…"   3 minutes ago       Up 3 minutes                            k8s_kube-controller-manager_kube-controller-manager-gauz_kube-system_d5c660bbfe23fa080a4fd4de0b58cd5a_6
818325d7186d        2c4adeb21b4f           "etcd --advertise-cl…"   3 minutes ago       Up 3 minutes                            k8s_etcd_etcd-gauz_kube-system_80213ba6c7294a012c698bed95cfd1ec_0
31c801d0d3c3        201c7a840312           "kube-apiserver --ad…"   4 minutes ago       Up 4 minutes                            k8s_kube-apiserver_kube-apiserver-gauz_kube-system_cc5422db7959b7b7d322007ee9e83b19_14
2a55791a815a        k8s.gcr.io/pause:3.1   "/pause"                 8 minutes ago       Up 8 minutes                            k8s_POD_kube-controller-manager-gauz_kube-system_d5c660bbfe23fa080a4fd4de0b58cd5a_0
6b77398f7ac4        2d3813851e87           "kube-scheduler --bi…"   23 minutes ago      Up 23 minutes                           k8s_kube-scheduler_kube-scheduler-gauz_kube-system_31d9ee8b7fb12e797dc981a8686f6b2b_0
9c35e45be1d2        k8s.gcr.io/pause:3.1   "/pause"                 23 minutes ago      Up 23 minutes                           k8s_POD_kube-scheduler-gauz_kube-system_31d9ee8b7fb12e797dc981a8686f6b2b_0
aa40dd695a5b        k8s.gcr.io/pause:3.1   "/pause"                 23 minutes ago      Up 23 minutes                           k8s_POD_kube-apiserver-gauz_kube-system_cc5422db7959b7b7d322007ee9e83b19_0
dff3a24339da        k8s.gcr.io/pause:3.1   "/pause"                 23 minutes ago      Up 23 minutes                           k8s_POD_etcd-gauz_kube-system_80213ba6c7294a012c698bed95cfd1ec_0

2.5 测试

kubectl run nginx --image=nginx --replicas=2 --port=80
kubectl run --generator=deployment/apps.v1 is DEPRECATED and will be removed in a future version. Use kubectl run --generator=run-pod/v1 or kubectl create instead.
deployment.apps/nginx created

kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-7c45b84548-dfp97   0/1     Pending   0          12s
nginx-7c45b84548-mbb59   0/1     Pending   0          12s

出于安全考虑，默认配置下Kubernetes不会将Pod调度到Master节点。如果希望将k8s-master也当作Node使用，可以执行如下命令：

kubectl taint node k8s-master node-role.kubernetes.io/master-

其中k8s-master是主机节点hostname如果要恢复Master Only状态，执行如下命令：

kubectl taint node k8s-master node-role.kubernetes.io/master=""

再次查看

kubectl get pods
NAME                     READY   STATUS              RESTARTS   AGE
nginx-7c45b84548-dfp97   0/1     ContainerCreating   0          111s
nginx-7c45b84548-mbb59   0/1     ContainerCreating   0          111s

kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-7c45b84548-dfp97   1/1     Running   0          4m13s
nginx-7c45b84548-mbb59   1/1     Running   0          4m13s

3 部署Ingress-nginx

3.1 下载mandatory.yaml和替换镜像源

wget https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.20.0/deploy/mandatory.yaml

sed -i 's#k8s.gcr.io/defaultbackend-amd64#registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/defaultbackend-amd64#g' mandatory.yaml  #替换defaultbackend-amd64镜像地址

sed -i 's#quay.io/kubernetes-ingress-controller/nginx-ingress-controller#registry.cn-qingdao.aliyuncs.com/kubernetes_xingej/nginx-ingress-controller#g' mandatory.yaml  #替换nginx-ingress-controller镜像地址

3.2 部署nginx-ingress-controller

kubectl apply -f mandatory.yaml 

3.3 添加NodePort端口

kubectl apply -f service-nodeport.yaml

service-nodeport.yaml内容如下

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: NodePort
  ports:
    - name: http
      port: 80
      targetPort: 80
      protocol: TCP
      nodePort: 32080  #http
    - name: https
      port: 443
      targetPort: 443
      protocol: TCP
      nodePort: 32443  #https
  selector:
    app.kubernetes.io/name: ingress-nginx
    app.kubernetes.io/part-of: ingress-nginx

3.4 查看服务

kubectl get svc -n ingress-nginx 
NAME                   TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)                      AGE
default-http-backend   ClusterIP   10.96.7.58     <none>        80/TCP                       79m
ingress-nginx          NodePort    10.96.177.26   <none>        80:32080/TCP,443:32443/TCP   51m

3.5 开放端口

iptables -I FORWARD -p tcp --sport 32080 -j ACCEPT
iptables -I FORWARD -p tcp --dport 32080 -j ACCEPT
iptables -I FORWARD -p tcp --sport 80 -j ACCEPT
iptables -I FORWARD -p tcp --dport 80 -j ACCEPT

3.6 测试

3.7 通过域名访问

​​kind: Ingress
metadata:
  name: ingress-app
  namespace: default
  annotations:
    kubernetes.io/ingress.class: "nginx"
spec:
  rules:
  - host: service.gauz #生产中该域名应当可以被公网解析
    http:
      paths:
      - path:
        backend:
          serviceName: nginx
          servicePort: 80

测试

4 额外

4.1 集群一直NotReady

 kubectl get nodes
NAME                        STATUS     ROLES    AGE     VERSION
test1                       NotReady   master   13m     v1.18.4
test2                       NotReady   <none>   8m45s   v1.18.4

查看日志

journalctl -f -u kubelet
— Logs begin at Fri 2020-03-13 23:48:41 HKT. —
Jun 19 10:13:45 test2 kubelet[12770]: W0619 10:13:45.254218   12770 cni.go:237] Unable to update cni config: no networks found in /etc/cni/net.d
Jun 19 10:13:46 test2 kubelet[12770]: E0619 10:13:46.598642   12770 kubelet.go:2187] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Jun 19 10:13:50 test2 kubelet[12770]: W0619 10:13:50.254465   12770 cni.go:237] Unable to update cni config: no networks found in /etc/cni/net.d
Jun 19 10:13:51 test2 kubelet[12770]: E0619 10:13:51.599853   12770 kubelet.go:2187] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Jun 19 10:13:55 test2 kubelet[12770]: W0619 10:13:55.254679   12770 cni.go:237] Unable to update cni config: no networks found in /etc/cni/net.d
Jun 19 10:13:56 test2 kubelet[12770]: E0619 10:13:56.601110   12770 kubelet.go:2187] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Jun 19 10:14:00 test2 kubelet[12770]: W0619 10:14:00.254862   12770 cni.go:237] Unable to update cni config: no networks found in /etc/cni/net.d
Jun 19 10:14:01 test2 kubelet[12770]: E0619 10:14:01.602280   12770 kubelet.go:2187] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Jun 19 10:14:05 test2 kubelet[12770]: W0619 10:14:05.255056   12770 cni.go:237] Unable to update cni config: no networks found in /etc/cni/net.d
Jun 19 10:14:06 test2 kubelet[12770]: E0619 10:14:06.603401   12770 kubelet.go:2187] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Jun 19 10:14:10 test2 kubelet[12770]: W0619 10:14:10.255183   12770 cni.go:237] Unable to update cni config: no networks found in /etc/cni/net.d
Jun 19 10:14:11 test2 kubelet[12770]: E0619 10:14:11.604576   12770 kubelet.go:2187] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Jun 19 10:14:15 test2 kubelet[12770]: W0619 10:14:15.255369   12770 cni.go:237] Unable to update cni config: no networks found in /etc/cni/net.d
Jun 19 10:14:16 test2 kubelet[12770]: E0619 10:14:16.605776   12770 kubelet.go:2187] Container runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized


安装

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

再次查看node状态

kubectl get nodes
NAME                        STATUS   ROLES    AGE   VERSION
test1                       Ready    master   29m   v1.18.4
test2                       Ready    <none>   24m   v1.18.4

4.2 [ERROR Swap]: running with swap on is not supported. Please disable swap

swapoff -a
修改 /etc/fstab 文件，注释掉 SWAP 的自动挂载，使用free -m确认swap已经关闭。 swappiness参数调整，修改/etc/sysctl.d/k8s.conf添加下面一行：

  vm.swappiness=0
执行sysctl -p /etc/sysctl.d/k8s.conf使修改生效。

4.3 [ERROR NumCPU]: the number of available CPUs 1 is less than the required 2

kubeadm init --kubernetes-version=v1.18.4 --pod-network-cidr=10.100.0.0/16  `--ignore-preflight-errors="all"