• Kubernetes那点事儿——集群搭建1.22（kubeadm部署）

    K8s集群搭建部署1.22

    一、k8s节点初始化

    1、centos7.4版本以上

    yum -y update

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    2、关闭防火墙及selinux

    systemctl stop firewalld

systemctl disable firewalld

sed -i 's/enforcing/disabled/' /etc/selinux/config  # 永久

setenforce 0  # 临时

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    3、关闭swap

    swapoff -a  # 临时

vim /etc/fstab  # 永久 （注释掉swap分区挂载）

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    4、设置主机名并写入hosts

    hostnamectl set-hostname <hostname>

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    5、将桥接的IPv4流量传递到iptables的链

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

sysctl --system

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    6、时间同步

    yum install ntpdate -y

ntpdate time.windows.com

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    7、安装docker

    yum install -y yum-utils device-mapper-persistent-data lvm2

yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo   # 配置yum源 

yum install -y docker-ce

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    二、k8s集群部署

    1、添加kubeadm阿里云yum源（所有节点）

    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=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

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    2、安装kubeadm，kubelet和kubectl（所有节点）

    1.18 1.19 版本：

yum install -y kubelet-1.19.0 kubeadm-1.19.0 kubectl-1.19.0

systemctl start kubelet.service  && systemctl enable kubelet.service

1.22版本：

yum install -y kubelet-1.22.2 kubeadm-1.22.2 kubectl-1.22.2

docker info |grep 'Cgroup Driver' |awk '{print $3}' # 获取docker cgroups

vim  /etc/sysconfig/kubelet # 配置kubelet启动参数
KUBELET_EXTRA_ARGS="--cgroup-driver=cgroupfs --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.5"

systemctl  daemon-reload

[root@k8s-master ~]# cat /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf
# Note: This dropin only works with kubeadm and kubelet v1.11+
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
EnvironmentFile=-/etc/sysconfig/kubelet
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
[root@k8s-master ~]# cat /etc/sysconfig/kubelet
KUBELET_EXTRA_ARGS="--cgroup-driver=cgroupfs --pod-infra-container-image=registry.aliyuncs.com/google_containers/pause:3.5"

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    kubeadm所有组件容器化，会拉取镜像，docker管理，【1.23版本遗弃docker使用containerd】。只有kubelet组件没有容器化，本地服务，systemctl管理。二进制安装方式中所有组件均为本地服务，systemctl管理。
    其次，在1.18 1.19版本中kubelet存在 ，是一个常规的systemctl管理的服务yum后可直接start启动，在1.22版本中kubelet中存在了变量，需要我们手动去设置，否则变量会获取失败kubelet启动失败。

    1.19版本与1.22版本 kubectl服务systemd文件对比：

cat /usr/lib/systemd/system/kubelet.service
[Unit]
Description=kubelet: The Kubernetes Node Agent
Documentation=https://kubernetes.io/docs/
Wants=network-online.target
After=network-online.target

[Service]
ExecStart=/usr/bin/kubelet
Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target


cat /usr/lib/systemd/system/kubelet.service.d/10-kubeadm.conf
# Note: This dropin only works with kubeadm and kubelet v1.11+
[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
EnvironmentFile=-/etc/sysconfig/kubelet
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS

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    3、master执行kubeadm init

    官网参考：https://kubernetes.io/zh-cn/docs/setup/production-environment/tools/kubeadm/create-cluster-kubeadm/

    kubeadm init \
  --apiserver-advertise-address=10.7.7.220 \
  --image-repository registry.aliyuncs.com/google_containers \
  --kubernetes-version v1.22.0 \
  --service-cidr=10.96.0.0/12 \
  --pod-network-cidr=10.244.0.0/16 \
  --ignore-preflight-errors=all

- --apiserver-advertise-address 集群通告地址，集群访问地址
- --image-repository  由于默认拉取镜像地址k8s.gcr.io国内无法访问，这里指定阿里云镜像仓库地址
- --kubernetes-version K8s版本，与上面安装的一致
- --service-cidr 集群内部虚拟网络，Pod统一访问入口
- --pod-network-cidr Podip，与后续部署的CNI网络组件yaml中保持一致

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    4、所有节点启动kubelet

    systemctl start kubelet.service

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    启动完kubelet后，在执行kubeadm join加入k8s集群时报错端口占用，可先停掉kuebelet再执行kubeadm join，kubelet会自动启动。

    在这里插入图片描述

    5、将node加入到k8s cluster

    在node节点执行kubeadm join
kubeadm join 10.7.7.220:6443 --token wrkk42.t96ukfl9zwc2irmt         --discovery-token-ca-cert-hash sha256:af215c4a74725ef2374f0d5ff97d1869c04a11349102aa0ea8b74b8561a041b6

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    此命令在master 节点kubeadm init成功会显示。直接复制到node节点执行就可以。

    在这里插入图片描述

    6、给node节点打label，使ROLES可以识别

    [root@k8s-master ~]# kubectl  get nodes
NAME         STATUS     ROLES                  AGE    VERSION
k8s-master   NotReady   control-plane,master   52m    v1.22.2
k8s-node1    NotReady   <none>                 6m3s   v1.22.2
k8s-node2    NotReady   <none>                 31m    v1.22.2

此时查看node信息发现STATUS为NotReady状态切node节点ROLES显示为none。
STATUS为NotReady是因为集群暂未安装网络插件，如flannel、calico

ROLES为none则需要给node节点打label是ROLES可识别
command：kubectl label nodes <节点名字> node-role.kubernetes.io/node=node

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    打label前后对比图

    7、部署网络组件（Calico）

    Calico是一个纯三层的数据中心网络方案，Calico支持广泛的平台，包括Kubernetes、OpenStack等。
    Calico 在每一个计算节点利用 Linux Kernel 实现了一个高效的虚拟路由器（ vRouter） 来负责数据转发，而每个 vRouter 通过 BGP 协议负责把自己上运行的 workload 的路由信息向整个 Calico 网络内传播。此外，Calico 项目还实现了 Kubernetes 网络策略，提供ACL功能。
    官网参考：https://docs.projectcalico.org/getting-started/kubernetes/quickstart

    wget https://docs.projectcalico.org/manifests/calico.yaml

vim calico.yaml
修改Pod网络（CALICO_IPV4POOL_CIDR），与前面kubeadm init指定的子网一样

kubectl apply -f calico.yaml # 创建calico资源

kubectl get pods -n kube-system # 查看pod

外网镜像如果拉取失败自行解决。
[root@k8s-master ~]# cat calico.yaml  |grep image
          image: docker.io/calico/cni:v3.24.0
          imagePullPolicy: IfNotPresent
          image: docker.io/calico/cni:v3.24.0
          imagePullPolicy: IfNotPresent
          image: docker.io/calico/node:v3.24.0
          imagePullPolicy: IfNotPresent
          image: docker.io/calico/node:v3.24.0
          imagePullPolicy: IfNotPresent
          image: docker.io/calico/kube-controllers:v3.24.0
          imagePullPolicy: IfNotPresen

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    在这里插入图片描述

    8、测试k8s集群

    简单使用命令行创建deployment、svc，，实用nodeport暴露nginx访问测试

[root@k8s-master release-v3.24.0]# kubectl create deployment nginx --image=nginx
deployment.apps/nginx created
[root@k8s-master release-v3.24.0]# kubectl expose deployment nginx --port=80 --type=NodePort
service/nginx exposed
[root@k8s-master release-v3.24.0]# kubectl get pod,svc
NAME                         READY   STATUS              RESTARTS   AGE
pod/nginx-6799fc88d8-rn7c6   0/1     ContainerCreating   0          18s

NAME                 TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP   10.96.0.1     <none>        443/TCP        6h16m
service/nginx        NodePort    10.111.2.36   <none>        80:32207/TCP   7s

[root@k8s-master release-v3.24.0]# kubectl get pod,svc
NAME                         READY   STATUS    RESTARTS   AGE
pod/nginx-6799fc88d8-rn7c6   1/1     Running   0          3m57s

NAME                 TYPE        CLUSTER-IP    EXTERNAL-IP   PORT(S)        AGE
service/kubernetes   ClusterIP   10.96.0.1     <none>        443/TCP        6h19m
service/nginx        NodePort    10.111.2.36   <none>        80:32207/TCP   3m46s

[root@k8s-master release-v3.24.0]#  curl http://10.7.7.222:32207 &&  curl http://10.7.7.221:32207 &&  curl http://10.7.7.220:32207
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>


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    9、部署Dashboard

    wget  https://raw.githubusercontent.com/kubernetes/dashboard/v2.6.1/aio/deploy/recommended.yaml

默认Dashboard只能集群内部访问，需要修改yaml文件Service为NodePort类型，暴露到外部
这里监听30001端口，这时我们可以通过访问集群任意节点的30001端口来访问dashboard
vim recommended.yaml 新增第40行、第44行

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    在这里插入图片描述
    在这里插入图片描述

    方式一 token登录

    创建service account并绑定默认cluster-admin管理员集群角色，使用输出的token登录Dashboard。（获取token）

    创建用户
kubectl create serviceaccount dashboard-admin -n kube-system

用户授权
kubectl create clusterrolebinding dashboard-admin --clusterrole=cluster-admin --serviceaccount=kube-system:dashboard-admin

获取用户token
kubectl describe secrets -n kube-system $(kubectl -n kube-system get secret | awk '/dashboard-admin/{print $1}')
Name:         dashboard-admin-token-h5nmv
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard-admin
              kubernetes.io/service-account.uid: 24106d77-7428-426c-a2a2-17147d320020

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1099 bytes
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6InR4ZEg2UFpjemREaGsxRFhKTTVDYWhpTTBTY2taNnZ1b0VlNUxzWlJFR1kifQ.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.MsH0-CXkau6rXVBkKG8piy9WGSW7U8Rw2lTD_3K7UGNZhBFbFArEgr59Khoj3NfJG9aGuDQPnCNCsr-6xtNmNXRRx0BSy0FX7iFGEEErRz6xAcfKPYMSf0f_fTdXFuBENSCIHrRipdm-5x76gnY3y6ifcA-2AORYow8gBhde3_7wlw-4V1i6EBppRHb9DHVEba2uMhKJM4QbgY1yaOCfrE1rEPCFb3mYhlblZq2PI_-z18hw12N0YhRN4aExFTkSqoX8sUQ7vku-NwvtpVpcsaNlNjmGIC4YpIRu7_B5nwqi72Gryqhm10EU-1uJzQRD11pdJ_dGKRM_VQgVRSPz8A

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    在这里插入图片描述

    方式二 kubeconfig

    获取dashboard token
kubectl -n kubernetes-dashboard get secrets
DASH_TOCKEN=$(kubectl -n kubernetes-dashboard get secrets kubernetes-dashboard-token-h8lcq -o jsonpath={.data.token} |base64 -d)

设置 kubeconfig 文件中的一个集群条目
kubectl config set-cluster kubernetes --server=10.7.7.220:6443 --kubeconfig=/root/dashboard-admin.conf

设置 kubeconfig 文件中的一个用户条目
kubectl config set-credentials kubernetes-dashboard --token=$DASH_TOCKEN --kubeconfig=/root/dashboard-admin.conf

设置 kubeconfig 文件中的一个上下文条目
kubectl config set-context kubernetes-dashboard@kubernetes --cluster=kubernetes --user=kubernetes-dashboard --kubeconfig=/root/dashboard-admin.conf

设置 kubeconfig 文件中的当前上下文
kubectl config use-context kubernetes-dashboard@kubernetes --kubeconfig=dashboard-admin.conf

下载到local
sz /root/dashboard-admin.conf

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    登录后会报错，没有权限访问资源，这里需要使用RBAC完成授权，后续篇章会详解RBAC
    在这里插入图片描述

    [root@k8s-master ~]# kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.crt --embed-certs=true --server=https://10.7.7.220:6443 --kubeconfig=dashboard.kubeconfig
Cluster "kubernetes" set.
[root@k8s-master ~]# kubectl config set-credentials dashboard --client-key=/root/ca/dashboard-key.pem --client-certificate=/root/ca/dashboard.pem --embed-certs=true --kubeconfig=dashboard.kubeconfig
[root@k8s-master ~]# kubectl config set-context kubernetes-dashboard@kubernetes --cluster=kubernetes --user=dashboard --kubeconfig=dashboard.kubeconfig
Context "kubernetes-dashboard@kubernetes" modified.
[root@k8s-master ~]# kubectl config use-context kubernetes-dashboard@kubernetes  --kubeconfig=dashboard.kubeconfig
Switched to context "kubernetes-dashboard@kubernetes"

[root@k8s-master ~]# cat rbac-dashboard.yaml 
---
#ServiceAccount
apiVersion: v1
kind: ServiceAccount
metadata:
  name: dashboard
  namespace: kubernetes-dashboard

---
#对default命名空间下的pods资源进行get、watch、list操作
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: kubernetes-dashboard
  name: dashboardrole
rules:
- apiGroups: [""] # api组 ， 空为核心组
  resources: ["pods"]
  verbs: ["get", "watch", "list"]
- apiGroups: ["extensions", "apps"]
  resources: ["deployments", "secrets", "namespaces"] # 资源
  verbs: ["get", "list", "watch", "create", "update", "patch", "delete"] # 对资源的操作

---
#角色绑定，权限绑定到哪些用户
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: dashboardrolebind
  namespace: kubernetes-dashboard
roleRef:
  kind: Role
  name: dashboardrole # 绑定权限
  apiGroup: rbac.authorization.k8s.io
subjects:
- kind: ServiceAccount
  name: dashboard # 授权用户，与证书的名称一致:w
  namespace: kubernetes-dashboard


[root@k8s-master ~]# kubectl  describe secrets dashboard-token-fk4vv -n kubernetes-dashboard
Name:         dashboard-token-fk4vv
Namespace:    kubernetes-dashboard
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: dashboard
              kubernetes.io/service-account.uid: 81c93e7c-f16c-4563-b0a4-e410c985872b

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1099 bytes
namespace:  20 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6InR4ZEg2UFpjemREaGsxRFhKTTVDYWhpTTBTY2taNnZ1b0VlNUxzWlJFR1kifQ.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.AygW0TtmRfq0dVD3dP047nnW2dZ9QnFCG7vFObuROANj0k2B2pGZepw41cEGyOYJ4zbW5FrTGzbqK32LIt0sD_VTzUQhUGO1gtRXlvGWVPiDAeXorDa2z3FzW_dKCGbRNXqYyHvVrnsZ2a82wxgdyHsymX4WjdpePngNO5Eqh-ZQnrVcFr3BzFTHqjLAXQIDOVFSIL3kisN3fm0WRZkMvNb-18W5KCjIzuOudhWN3dCnaRUhDH247RRIoSzRxHLqtj4gdL9QMqYp9RZIhXkPP3V_w-n3GaOyLaygCHXYwkrR9Y60xb60gLN8DhQP5kmOwVjuNrIi_dHEbjC906wA5Q

将 token放入的kubeconfig文件

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    在这里插入图片描述在这里插入图片描述

    这次我们可以看到资源信息，还有报错是因为我们这个token对应的用serviceacount没有这些资源的访问权限，权限可以按需使用RBAC设置。

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  • 原文地址：https://blog.csdn.net/liangpangpangyo/article/details/126901766