使用kubeadm在Centos8上部署kubernetnes1.18

古城微笑少年丶 2023-02-12 13:23 28阅读 0赞

Centos8系统发布已有一段时间，不少小伙伴开始上手使用。kubernetes1.18也发布了，今天作者使用kubeadm在Centos8系统上部署kubernetes。

### 1 系统准备 ###

查看系统版本

[root@localhost]# cat /etc/centos-release
    CentOS Linux release 8.1.1911 (Core)

配置网络

[root@localhost ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s3
    TYPE=Ethernet
    PROXY_METHOD=none
    BROWSER_ONLY=no
    BOOTPROTO=static
    DEFROUTE=yes
    IPV4_FAILURE_FATAL=no
    IPV6INIT=yes
    IPV6_AUTOCONF=yes
    IPV6_DEFROUTE=yes
    IPV6_FAILURE_FATAL=no
    IPV6_ADDR_GEN_MODE=stable-privacy
    NAME=enp0s3
    UUID=039303a5-c70d-4973-8c91-97eaa071c23d
    DEVICE=enp0s3
    ONBOOT=yes
    IPADDR=192.168.122.21
    NETMASK=255.255.255.0
    GATEWAY=192.168.122.1
    DNS1=223.5.5.5

添加阿里源

[root@localhost ~]# rm -rfv /etc/yum.repos.d/*
    [root@localhost ~]# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo

配置主机名

[root@master01 ~]# cat /etc/hosts
    127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    192.168.122.21 master01.paas.com master01

关闭swap，注释swap分区

[root@master01 ~]# swapoff -a
    [root@master01 ~]# cat /etc/fstab
    
    #
    # /etc/fstab
    # Created by anaconda on Tue Mar 31 22:44:34 2020
    #
    # Accessible filesystems, by reference, are maintained under '/dev/disk/'.
    # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
    #
    # After editing this file, run 'systemctl daemon-reload' to update systemd
    # units generated from this file.
    #
    /dev/mapper/cl-root     /                       xfs     defaults        0 0
    UUID=5fecb240-379b-4331-ba04-f41338e81a6e /boot                   ext4    defaults        1 2
    /dev/mapper/cl-home     /home                   xfs     defaults        0 0
    #/dev/mapper/cl-swap     swap                    swap    defaults        0 0

配置内核参数，将桥接的IPv4流量传递到iptables的链

[root@master01 ~]# cat > /etc/sysctl.d/k8s.conf <<EOF
    net.bridge.bridge-nf-call-ip6tables = 1
    net.bridge.bridge-nf-call-iptables = 1
    EOF
    sysctl --system

### 2 安装常用包 ###

[root@master01 ~]# yum install vim bash-completion net-tools gcc -y

### 3 使用aliyun源安装docker-ce ###

[root@master01 ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
    [root@master01 ~]# yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
    [root@master01 ~]# yum -y install docker-ce

安装docker-ce如果出现以下错

[root@master01 ~]# yum -y install docker-ce
    CentOS-8 - Base - mirrors.aliyun.com                                                                               14 kB/s | 3.8 kB     00:00
    CentOS-8 - Extras - mirrors.aliyun.com                                                                            6.4 kB/s | 1.5 kB     00:00
    CentOS-8 - AppStream - mirrors.aliyun.com                                                                          16 kB/s | 4.3 kB     00:00
    Docker CE Stable - x86_64                                                                                          40 kB/s |  22 kB     00:00
    Error:
     Problem: package docker-ce-3:19.03.8-3.el7.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed
      - cannot install the best candidate for the job
      - package containerd.io-1.2.10-3.2.el7.x86_64 is excluded
      - package containerd.io-1.2.13-3.1.el7.x86_64 is excluded
      - package containerd.io-1.2.2-3.3.el7.x86_64 is excluded
      - package containerd.io-1.2.2-3.el7.x86_64 is excluded
      - package containerd.io-1.2.4-3.1.el7.x86_64 is excluded
      - package containerd.io-1.2.5-3.1.el7.x86_64 is excluded
      - package containerd.io-1.2.6-3.3.el7.x86_64 is excluded
    (try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages)

解决方法

[root@master01 ~]# wget https://download.docker.com/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
    [root@master01 ~]# yum install containerd.io-1.2.6-3.3.el7.x86_64.rpm

然后再安装docker-ce即可成功  
添加aliyundocker仓库加速器

[root@master01 ~]# mkdir -p /etc/docker
    [root@master01 ~]# tee /etc/docker/daemon.json <<-'EOF'
    {
      "registry-mirrors": ["https://fl791z1h.mirror.aliyuncs.com"]
    }
    EOF
    [root@master01 ~]# systemctl daemon-reload
    [root@master01 ~]# systemctl restart docker

### 4 安装kubectl、kubelet、kubeadm ###

添加阿里kubernetes源

[root@master01 ~]# cat <<EOF > /etc/yum.repos.d/kubernetes.repo
    [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

[root@master01 ~]# yum install kubectl kubelet kubeadm
    [root@master01 ~]# systemctl enable kubelet

### 5 初始化k8s集群 ###

[root@master01 ~]# kubeadm init --kubernetes-version=1.18.0  \
    --apiserver-advertise-address=192.168.122.21   \
    --image-repository registry.aliyuncs.com/google_containers  \
    --service-cidr=10.10.0.0/16 --pod-network-cidr=10.122.0.0/16

POD的网段为: 10.122.0.0/16， api server地址就是master本机IP。

这一步很关键，由于kubeadm 默认从官网k8s.grc.io下载所需镜像，国内无法访问，因此需要通过–image-repository指定阿里云镜像仓库地址。

集群初始化成功后返回如下信息：

W0408 09:36:36.121603   14098 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io]
    [init] Using Kubernetes version: v1.18.0
    [preflight] Running pre-flight checks
            [WARNING FileExisting-tc]: tc not found in system path
    [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] Starting the kubelet
    [certs] Using certificateDir folder "/etc/kubernetes/pki"
    [certs] Generating "ca" certificate and key
    [certs] Generating "apiserver" certificate and key
    [certs] apiserver serving cert is signed for DNS names [master01.paas.com kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.10.0.1 192.168.122.21]
    [certs] Generating "apiserver-kubelet-client" certificate and key
    [certs] Generating "front-proxy-ca" certificate and key
    [certs] Generating "front-proxy-client" certificate and key
    [certs] Generating "etcd/ca" certificate and key
    [certs] Generating "etcd/server" certificate and key
    [certs] etcd/server serving cert is signed for DNS names [master01.paas.com localhost] and IPs [192.168.122.21 127.0.0.1 ::1]
    [certs] Generating "etcd/peer" certificate and key
    [certs] etcd/peer serving cert is signed for DNS names [master01.paas.com localhost] and IPs [192.168.122.21 127.0.0.1 ::1]
    [certs] Generating "etcd/healthcheck-client" certificate and key
    [certs] Generating "apiserver-etcd-client" certificate and key
    [certs] Generating "sa" key and public key
    [kubeconfig] Using kubeconfig folder "/etc/kubernetes"
    [kubeconfig] Writing "admin.conf" kubeconfig file
    [kubeconfig] Writing "kubelet.conf" kubeconfig file
    [kubeconfig] Writing "controller-manager.conf" kubeconfig file
    [kubeconfig] Writing "scheduler.conf" kubeconfig file
    [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"
    W0408 09:36:43.343191   14098 manifests.go:225] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
    [control-plane] Creating static Pod manifest for "kube-scheduler"
    W0408 09:36:43.344303   14098 manifests.go:225] the default kube-apiserver authorization-mode is "Node,RBAC"; using "Node,RBAC"
    [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 23.002541 seconds
    [upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace
    [kubelet] Creating a ConfigMap "kubelet-config-1.18" 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 master01.paas.com as control-plane by adding the label "node-role.kubernetes.io/master=''"
    [mark-control-plane] Marking the node master01.paas.com as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule]
    [bootstrap-token] Using token: v2r5a4.veazy2xhzetpktfz
    [bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles
    [bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to get nodes
    [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
    [kubelet-finalize] Updating "/etc/kubernetes/kubelet.conf" to point to a rotatable kubelet client certificate and key
    [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 192.168.122.21:6443 --token v2r5a4.veazy2xhzetpktfz \
        --discovery-token-ca-cert-hash sha256:daded8514c8350f7c238204979039ff9884d5b595ca950ba8bbce80724fd65d4
    [root@master01 ~]#

记录生成的最后部分内容，此内容需要在其它节点加入Kubernetes集群时执行。  
根据提示创建kubectl

[root@master01 ~]#  mkdir -p $HOME/.kube
    [root@master01 ~]# sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    [root@master01 ~]#   sudo chown $(id -u):$(id -g) $HOME/.kube/config

执行下面命令，使kubectl可以自动补充

[root@master01 ~]# source <(kubectl completion bash)

查看节点，pod

[root@master01 ~]# kubectl get node
    NAME                STATUS     ROLES    AGE     VERSION
    master01.paas.com   NotReady   master   2m29s   v1.18.0
    [root@master01 ~]# kubectl get pod --all-namespaces
    NAMESPACE     NAME                                        READY   STATUS    RESTARTS   AGE
    kube-system   coredns-7ff77c879f-fsj9l                    0/1     Pending   0          2m12s
    kube-system   coredns-7ff77c879f-q5ll2                    0/1     Pending   0          2m12s
    kube-system   etcd-master01.paas.com                      1/1     Running   0          2m22s
    kube-system   kube-apiserver-master01.paas.com            1/1     Running   0          2m22s
    kube-system   kube-controller-manager-master01.paas.com   1/1     Running   0          2m22s
    kube-system   kube-proxy-th472                            1/1     Running   0          2m12s
    kube-system   kube-scheduler-master01.paas.com            1/1     Running   0          2m22s
    [root@master01 ~]#

node节点为NotReady，因为corednspod没有启动，缺少网络pod

### 6 安装calico网络 ###

[root@master01 ~]# kubectl apply -f https://docs.projectcalico.org/manifests/calico.yaml
    configmap/calico-config created
    customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created
    customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created
    clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created
    clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created
    clusterrole.rbac.authorization.k8s.io/calico-node created
    clusterrolebinding.rbac.authorization.k8s.io/calico-node created
    daemonset.apps/calico-node created
    serviceaccount/calico-node created
    deployment.apps/calico-kube-controllers created
    serviceaccount/calico-kube-controllers created

查看pod和node

[root@master01 ~]# kubectl get pod --all-namespaces
    NAMESPACE     NAME                                        READY   STATUS    RESTARTS   AGE
    kube-system   calico-kube-controllers-555fc8cc5c-k8rbk    1/1     Running   0          36s
    kube-system   calico-node-5km27                           1/1     Running   0          36s
    kube-system   coredns-7ff77c879f-fsj9l                    1/1     Running   0          5m22s
    kube-system   coredns-7ff77c879f-q5ll2                    1/1     Running   0          5m22s
    kube-system   etcd-master01.paas.com                      1/1     Running   0          5m32s
    kube-system   kube-apiserver-master01.paas.com            1/1     Running   0          5m32s
    kube-system   kube-controller-manager-master01.paas.com   1/1     Running   0          5m32s
    kube-system   kube-proxy-th472                            1/1     Running   0          5m22s
    kube-system   kube-scheduler-master01.paas.com            1/1     Running   0          5m32s
    [root@master01 ~]# kubectl get node
    NAME                STATUS   ROLES    AGE     VERSION
    master01.paas.com   Ready    master   5m47s   v1.18.0
    [root@master01 ~]#

此时集群状态正常

### 7 安装kubernetes-dashboard ###

官方部署dashboard的服务没使用nodeport，将yaml文件下载到本地，在service里添加nodeport

[root@master01 ~]# wget  https://raw.githubusercontent.com/kubernetes/dashboard/v2.0.0-rc7/aio/deploy/recommended.yaml
    [root@master01 ~]# vim recommended.yaml
    kind: Service
    apiVersion: v1
    metadata:
      labels:
        k8s-app: kubernetes-dashboard
      name: kubernetes-dashboard
      namespace: kubernetes-dashboard
    spec:
      type: NodePort
      ports:
        - port: 443
          targetPort: 8443
          nodePort: 30000
      selector:
        k8s-app: kubernetes-dashboard
    
    [root@master01 ~]# kubectl create -f recommended.yaml
    namespace/kubernetes-dashboard created
    serviceaccount/kubernetes-dashboard created
    service/kubernetes-dashboard created
    secret/kubernetes-dashboard-certs created
    secret/kubernetes-dashboard-csrf created
    secret/kubernetes-dashboard-key-holder created
    configmap/kubernetes-dashboard-settings created
    role.rbac.authorization.k8s.io/kubernetes-dashboard created
    clusterrole.rbac.authorization.k8s.io/kubernetes-dashboard created
    rolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
    clusterrolebinding.rbac.authorization.k8s.io/kubernetes-dashboard created
    deployment.apps/kubernetes-dashboard created
    service/dashboard-metrics-scraper created
    deployment.apps/dashboard-metrics-scraper created

查看pod，service

NAME                                        READY   STATUS    RESTARTS   AGE
    dashboard-metrics-scraper-dc6947fbf-869kf   1/1     Running   0          37s
    kubernetes-dashboard-5d4dc8b976-sdxxt       1/1     Running   0          37s
    [root@master01 ~]# kubectl get svc -n kubernetes-dashboard
    NAME                        TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
    dashboard-metrics-scraper   ClusterIP   10.10.58.93    <none>        8000/TCP        44s
    kubernetes-dashboard        NodePort    10.10.132.66   <none>        443:30000/TCP   44s
    [root@master01 ~]#

通过页面访问，推荐使用firefox浏览器  
![format_png][]  
使用token进行登录，执行下面命令获取token

[root@master01 ~]# kubectl describe secrets -n kubernetes-dashboard kubernetes-dashboard-token-t4hxz  | grep token | awk 'NR==3{print $2}'
    eyJhbGciOiJSUzI1NiIsImtpZCI6IlhJaDgyTWEzZ3FtWE9hTnJqUHN1akdHZU1pRHN3QWM2RUlQbUVOT0g0Qm8ifQ.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.Mcw9zYSbTfhaYV38vlEaI0CSomYLtb05F2AIGpyT_PjIN8xmRdnIQhWGANBDuuDjdxScSXHOytHAKdj3pzBFVw_lfU5PseBg6hmdv_EPFPh2GvRd9XCs0TE5CVX8qfHkAGKc-DltA7jPwt5VqIFjnolLLGXB-exhiU73YMG_Xy9dZE-u0KKCvSq7XZDR87P_X30JYCAZXDlxcv8iOsuI4I-wlacm6LRF6HgyJqctJNVyE7seVVIgLqetAtt9LicTo6BBozbefHeK6zqRYeITU8AHhe-PLS4xo2fey5up77v4vyPHy_SEnKOtZcBzje1XKNPolGfiXItLYF7u95m9_A

登录后如下展示，如果没有namespace可选，并且提示找不到资源 ，那么就是权限问题  
![format_png 1][]  
通过查看dashboard日志，得到如下 信息

[root@master01 ~]# kubectl logs -f -n kubernetes-dashboard kubernetes-dashboard-5d4dc8b976-sdxxt
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: namespaces is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "namespaces" in API group "" at the cluster scope
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 GET /api/v1/cronjob/default?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 01:54:31 Getting list of all cron jobs in the cluster
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: cronjobs.batch is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "cronjobs" in API group "batch" in the namespace "default"
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 POST /api/v1/token/refresh request from 192.168.122.21:7788: { contents hidden }
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 GET /api/v1/daemonset/default?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 GET /api/v1/deployment/default?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: daemonsets.apps is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "daemonsets" in API group "apps" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: pods is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "pods" in API group "" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: events is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "events" in API group "" in the namespace "default"
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 GET /api/v1/csrftoken/token request from 192.168.122.21:7788:
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 Getting list of all deployments in the cluster
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: deployments.apps is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "deployments" in API group "apps" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: pods is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "pods" in API group "" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: events is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "events" in API group "" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: replicasets.apps is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "replicasets" in API group "apps" in the namespace "default"
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 GET /api/v1/job/default?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 GET /api/v1/pod/default?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 01:54:31 Getting list of all jobs in the cluster
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: jobs.batch is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "jobs" in API group "batch" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: pods is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "pods" in API group "" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: events is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "events" in API group "" in the namespace "default"
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 Getting list of all pods in the cluster
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: pods is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "pods" in API group "" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: events is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "events" in API group "" in the namespace "default"
    2020/04/08 01:54:31 Getting pod metrics
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 GET /api/v1/replicaset/default?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 01:54:31 Getting list of all replica sets in the cluster
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Incoming HTTP/2.0 GET /api/v1/replicationcontroller/default?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: replicasets.apps is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "replicasets" in API group "apps" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: pods is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "pods" in API group "" in the namespace "default"
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: events is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "events" in API group "" in the namespace "default"
    2020/04/08 01:54:31 [2020-04-08T01:54:31Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 01:54:31 Getting list of all replication controllers in the cluster
    2020/04/08 01:54:31 Non-critical error occurred during resource retrieval: replicationcontrollers is forbidden: User "system:serviceaccount:kubernetes-dashboard:kubernetes-dashboard" cannot list resource "replicationcontrollers" in API group "" in the namespace "default"

解决方法

[root@master01 ~]# kubectl create clusterrolebinding serviceaccount-cluster-admin --clusterrole=cluster-admin --group=system:serviceaccount 
    clusterrolebinding.rbac.authorization.k8s.io/serviceaccount-cluster-admin created

查看dashboard日志

[root@master01 ~]# kubectl logs -f -n kubernetes-dashboard kubernetes-dashboard-5d4dc8b976-sdxx
    2020/04/08 02:07:03 Getting list of namespaces
    2020/04/08 02:07:03 [2020-04-08T02:07:03Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:08 [2020-04-08T02:07:08Z] Incoming HTTP/2.0 GET /api/v1/node?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 02:07:08 [2020-04-08T02:07:08Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:08 [2020-04-08T02:07:08Z] Incoming HTTP/2.0 GET /api/v1/namespace request from 192.168.122.21:7788:
    2020/04/08 02:07:08 Getting list of namespaces
    2020/04/08 02:07:08 [2020-04-08T02:07:08Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:13 [2020-04-08T02:07:13Z] Incoming HTTP/2.0 GET /api/v1/node?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 02:07:13 [2020-04-08T02:07:13Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:13 [2020-04-08T02:07:13Z] Incoming HTTP/2.0 GET /api/v1/namespace request from 192.168.122.21:7788:
    2020/04/08 02:07:13 Getting list of namespaces
    2020/04/08 02:07:13 [2020-04-08T02:07:13Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:18 [2020-04-08T02:07:18Z] Incoming HTTP/2.0 GET /api/v1/node?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 02:07:18 [2020-04-08T02:07:18Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:18 [2020-04-08T02:07:18Z] Incoming HTTP/2.0 GET /api/v1/namespace request from 192.168.122.21:7788:
    2020/04/08 02:07:18 Getting list of namespaces
    2020/04/08 02:07:18 [2020-04-08T02:07:18Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:23 [2020-04-08T02:07:23Z] Incoming HTTP/2.0 GET /api/v1/node?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 02:07:23 [2020-04-08T02:07:23Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:23 [2020-04-08T02:07:23Z] Incoming HTTP/2.0 GET /api/v1/namespace request from 192.168.122.21:7788:
    2020/04/08 02:07:23 Getting list of namespaces
    2020/04/08 02:07:23 [2020-04-08T02:07:23Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:28 [2020-04-08T02:07:28Z] Incoming HTTP/2.0 GET /api/v1/node?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 02:07:28 [2020-04-08T02:07:28Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:28 [2020-04-08T02:07:28Z] Incoming HTTP/2.0 GET /api/v1/namespace request from 192.168.122.21:7788:
    2020/04/08 02:07:28 Getting list of namespaces
    2020/04/08 02:07:28 [2020-04-08T02:07:28Z] Outcoming response to 192.168.122.21:7788 with 200 status code
    2020/04/08 02:07:33 [2020-04-08T02:07:33Z] Incoming HTTP/2.0 GET /api/v1/node?itemsPerPage=10&page=1&sortBy=d,creationTimestamp request from 192.168.122.21:7788:
    2020/04/08 02:07:33 [2020-04-08T02:07:33Z] Outcoming response to 192.168.122.21:7788 with 200 status code

此时再查看dashboard，即可看到有资源展示  
![format_png 2][]

#### 按照以上步骤可在CentOS8成功安装k8s1.18版本，如遇到问题，可以在评价区留言。 ####

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