CentOS7安装K8S V1.23.3

一、系统准备

查看系统版本

[root@localhost docker]# cat /etc/centos-release
CentOS Linux release 7.9.2009 (Core)

配置网络

TYPE=Ethernet
PROXY_METHOD=none
BROWSER_ONLY=no
BOOTPROTO=dhcp
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=ens33
UUID=704978ef-5eae-4d56-bd9d-39ca10ee3bd0
DEVICE=ens33
ONBOOT=yes
BOOTPROTO=static
DNS1=1x.5x.2xx.13
DNS2=x0.xx.xxx.14
IPADDR=192.168.163.131
NETMASK=255.255.255.0
GATEWAY=192.168.163.2

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-7.repo

配置主机名

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

关闭swap，注释swap分区

[root@master01 ~]# swapoff -a
[root@localhost docker]# vi /etc/fstab
#
# /etc/fstab
# Created by anaconda on Fri Dec 31 10:13:36 2021
#
# 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
#
/dev/mapper/centos-root /                       xfs     defaults        0 0
UUID=47072dd8-78d8-47bf-a319-f96dfbc900aa /boot                   xfs     defaults        0 0
#/dev/mapper/centos-swap swap                    swap    defaults        0 0

# 第三步确认swap已经关闭
[root@localhost docker]# free -m
              total        used        free      shared  buff/cache   available
Mem:           1819        1055          95          12         667         600
Swap:             0           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 <

二、安装常用包

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

三、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

配置docker， 为k8s部署做准备

[root@master01 ~]# mkdir -p /etc/docker
[root@master01 ~]# tee /etc/docker/daemon.json <<-'EOF'
{
    "exec-opts":[
        "native.cgroupdriver=systemd"
    ]
}
EOF
[root@master01 ~]# systemctl daemon-reload
[root@master01 ~]# systemctl restart docker

四、安装kubectl、kubelet、kubeadm

添加阿里kubernetes源

[root@master01 ~]# cat < /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

五、初始化k8s集群

# POD的网段为: 10.244.0.0/16， api server地址就是master本机IP。
[root@master01 ~]# kubeadm init --kubernetes-version=v1.23.3 \
--apiserver-advertise-address=192.168.163.131   \
--image-repository registry.aliyuncs.com/google_containers  \
--service-cidr=10.1.0.0/16 --pod-network-cidr=10.244.0.0/16

初始化过程遇到问题：参考步骤一：关闭swap分区  参考步骤三：配置docker

遇到错误：请使用 kubeadm reset重置之后，继续使用上面命令进行初始化

初始化提示一：
[preflight] Running pre-flight checks
        [WARNING Firewalld]: firewalld is active, please ensure ports [6443 10250] are open or your cluster may not function correctly
        [WARNING Service-Docker]: docker service is not enabled, please run 'systemctl enable docker.service'
        [WARNING Swap]: swap is enabled; production deployments should disable swap unless testing the NodeSwap feature gate of the kubelet


初始化提示二：
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.
[kubelet-check] It seems like the kubelet isn't running or healthy.
[kubelet-check] The HTTP call equal to 'curl -sSL http://localhost:10248/healthz' failed with error: Get "http://localhost:10248/healthz": dial tcp [::1]:10248: connect: connection refused.

成功提示

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

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

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 192.168.163.131:6443 --token ucuthy.65s2dj114t4y92gw \
        --discovery-token-ca-cert-hash sha256:fe0ce0734b3eb14fb52e1cbe9bea688db4d5e53c84f2436765a4c633f5d6fbe6

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@localhost docker]# kubectl get pod --all-namespaces
NAMESPACE     NAME                                            READY   STATUS    RESTARTS   AGE
kube-system   coredns-6d8c4cb4d-fhzpd                         0/1     Pending   0          82s
kube-system   coredns-6d8c4cb4d-lr2r9                         0/1     Pending   0          82s
kube-system   etcd-localhost.localdomain                      1/1     Running   1          96s
kube-system   kube-apiserver-localhost.localdomain            1/1     Running   0          96s
kube-system   kube-controller-manager-localhost.localdomain   1/1     Running   0          96s
kube-system   kube-proxy-5tf4j                                1/1     Running   0          82s
kube-system   kube-scheduler-localhost.localdomain            1/1     Running   1          96s

六、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（需要几分钟时间）

[root@localhost docker]# kubectl get pod --all-namespaces
NAMESPACE     NAME                                            READY   STATUS    RESTARTS   AGE
kube-system   calico-kube-controllers-85b5b5888d-h2dqx        1/1     Running   0          114s
kube-system   calico-node-dsp2s                               1/1     Running   0          114s
kube-system   coredns-6d8c4cb4d-fhzpd                         1/1     Running   0          3m42s
kube-system   coredns-6d8c4cb4d-lr2r9                         1/1     Running   0          3m42s
kube-system   etcd-localhost.localdomain                      1/1     Running   1          3m56s
kube-system   kube-apiserver-localhost.localdomain            1/1     Running   0          3m56s
kube-system   kube-controller-manager-localhost.localdomain   1/1     Running   0          3m56s
kube-system   kube-proxy-5tf4j                                1/1     Running   0          3m42s
kube-system   kube-scheduler-localhost.localdomain            1/1     Running   1          3m56s

此时集群状态正常

七、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

# type: NodePort  nodePort: 30000
[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            8000/TCP        44s
kubernetes-dashboard        NodePort    10.10.132.66           443:30000/TCP   44s

使用token进行登录，执行下面命令获取token

[root@localhost docker]# kubectl describe secrets -n kubernetes-dashboard kubernetes-dashboard-token-rvnvq  | grep token | awk 'NR==3{print $2}'
eyJhbGciOiJSUzI1NiIsImtpZCI6InVRNm02dHNNNmJKR01SMWl2bl9Ubk0weHY1T1lFSi1PaVMxblpjRFQtNnMifQ.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.SR7tkzke_fV4ToNuHU5iciSfkqT7oc3AAPrPHl54VdN2hEpRUp2JF5TgpRDB4_-YoELWU3O5ZGsy2yR_HXTq7tdjIrTR6K2ZeX0344BPVKbGFf_CpFfAYiVTkM9EaVZSV6EO20JIxY5Qc_E_5TbwzDTI0ZYZE3l2VLwYv_F5LgMddeaQWX4iaQdzEiPsD6QM4QudSAzFcMKbH22xBG1WLtzQKI0N9KOccUWKpBwdRXTC0no3V_fgbCanv-NJ7skvGX17pCYdLvlFddMWxzE7tHabZTzmZr8K4UsMoo3k0KWv9BGAbXV8MHcM0OJU4bJEWNMB9PgFIdlk0rWoY9arZw

如果不能访问，并且dashboardpod中日志有error产生

访问地址： https://192.168.163.131:30000/#/namespace?namespace=default

2022/01/29 08:11:04 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"
2022/01/29 08:11:04 Getting pod metrics
2022/01/29 08:11:04 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"
2022/01/29 08:11:04 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"
2022/01/29 08:11:04 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"

 如下方法可以解决：第一个步骤不能解决、采用第二个步骤

[root@localhost docker]# kubectl delete -f recommended.yaml

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

[root@localhost docker]# vi recommended.yaml
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  labels:
    k8s-app: kubernetes-dashboard
  name: kubernetes-dashboard
rules:
  # 非常重要：Allow Metrics Scraper to get metrics from the Metrics server
  - apiGroups: ["","apps","batch","extensions", "metrics.k8s.io"]
    resources: ["*"]
    verbs: ["get", "list", "watch"]
    
# kubectl apply -f recommended.yaml

此时再查看dashboard，即可看到有资源展示

 

 

八、客户端调用api

xiaxinyu/go-middlewarehttps://gitee.com/xiaxinyu3_admin/go-middleware.git