CentOS8 搭建Kubernetes

主机名

IP

组件

k8s-master

192.168.40.128/24

kubeadm、kubelet、kubectl、docker-ce

k8s-node1

192.168.40.129/24

kubeadm、kubelet、kubectl、docker-ce

k8s-node2

192.168.40.130/24

kubeadm、kubelet、kubectl、docker-ce

系统：CentOS8

配置：master：8核，4G  node1：8核  2G  node1：8核  2G

网络环境：IPv6、IPv4、VPN

网络环境有VPN下文部分资源使用了官方源

1.更新软件包

[root@localhost ~]# dnf update

2.三台机器安装Docker

[root@localhost ~]# vim /etc/hosts

[root@localhost ~]# cat /etc/hosts

127.0.0.1  localhost localhost.localdomain localhost4 localhost4.localdomain4

::1        localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.40.128       k8s-master master

192.168.40.129       k8s-node1 node1

192.168.40.130       k8s-node2 node2

[root@localhost ~]# dnf install yum-utilsdevice-mapper-persistent-data lvm2

[root@localhost ~]# dnf remove docker \

                 docker-client \

                  docker-client-latest\

                 docker-common \

                 docker-latest \

                 docker-latest-logrotate \

                 docker-logrotate \

                 docker-engine

[root@localhost ~]# cd /etc/yum.repos.d/

[root@localhost~]# wget https://download.docker.com/linux/centos/docker-ce.repo

[root@localhost~]# dnf update

[root@localhost~]# dnf install docker-ce –nobest
 

3.开机自启docker并启动

[root@localhost~]# systemctl enable docker

[root@localhost~]# systemctl start docker

[root@localhost~]# systemctl status docker

●docker.service - Docker Application Container Engine

   Loaded: loaded(/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)

   Active: active (running) since Wed2019-12-18 10:25:46 EST; 6s ago

     Docs: https://docs.docker.com

 Main PID: 73169 (dockerd)

    Tasks: 32 (limit: 5935)

   Memory: 105.9M

   CGroup: /system.slice/docker.service

           ├─73169 /usr/bin/dockerd

           └─73180 docker-containerd --config/var/run/docker/containerd/containerd.toml

4.配置内核参数

[root@localhost~]# vim /etc/sysctl.d/k8s.conf

[root@localhost~]# cat /etc/sysctl.d/k8s.conf

net.bridge.bridge-nf-call-ip6tables= 1

net.bridge.bridge-nf-call-iptables= 1

net.ipv4.ip_nonlocal_bind= 1

net.ipv4.ip_forward= 1

vm.swappiness=0

[root@localhost~]# sysctl –system

5.添加必要内核模块

[root@localhost~]# vim /etc/sysconfig/modules/ipvs.modules

[root@localhost~]# cat /etc/sysconfig/modules/ipvs.modules

#!/bin/bash

modprobe-- ip_vs

modprobe-- ip_vs_rr

modprobe-- ip_vs_wrr

modprobe-- ip_vs_sh

modprobe-- nf_conntrack_ipv4

[root@localhost~]# chmod +x /etc/sysconfig/modules/ipvs.modules

[root@localhost~]# ./etc/sysconfig/modules/ipvs.modules

-bash:./etc/sysconfig/modules/ipvs.modules: 没有那个文件或目录

[root@localhost~]# /etc/sysconfig/modules/ipvs.modules

6添加kubeadm的yum源

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

>[kubernetes]

>name=Kubernetes

>baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64

>enabled=1

>gpgcheck=1

>repo_gpgcheck=1

>gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpghttps://packages.cloud.google.com/yum/doc/rpm-package-key.gpg

>exclude=kube*

> EOF

7.配置master节点

[root@localhost~]# cd /etc/yum.repos.d/

[root@localhost~]# mv docker-ce.repo{,.back}

[root@localhost~]# dnf update –nobest

[root@localhost~]# dnf install ipvsadm

[root@localhost~]# yum install -y kubelet kubeadm kubectl --disableexcludes=Kubernetes

[root@localhost~]# systemctl enable kubelet && systemctl start kubelet

[root@localhost~]# kubeadm config print init-defaults > kubeadm-init.yaml
[root@localhost~]# vim kubeadm-init.yaml

[root@localhost~]# cat kubeadm-init.yaml

apiVersion:kubeadm.k8s.io/v1beta2

bootstrapTokens:

-groups:

  -system:bootstrappers:kubeadm:default-node-token

  token: abcdef.0123456789abcdef

  ttl: 24h0m0s

  usages:

  - signing

  - authentication

kind:InitConfiguration

localAPIEndpoint:

  advertiseAddress: 1.2.3.4

  bindPort: 6443

nodeRegistration:

  criSocket: /var/run/dockershim.sock

  name: localhost.localdomain

  taints:

  - effect: NoSchedule

    key: node-role.kubernetes.io/master

---

apiServer:

  timeoutForControlPlane: 4m0s

apiVersion:kubeadm.k8s.io/v1beta2

certificatesDir:/etc/kubernetes/pki

clusterName:kubernetes

controllerManager:{}

dns:

  type: CoreDNS

etcd:

  local:

    dataDir: /var/lib/etcd

imageRepository:k8s.gcr.io

kind:ClusterConfiguration

kubernetesVersion:v1.17.0

networking:

  dnsDomain: cluster.local

  serviceSubnet: 10.96.0.0/12

scheduler:{}

[root@localhost~]# vim kubeadm-init.yaml

[root@localhost~]# cat kubeadm-init.yaml

apiVersion:kubeadm.k8s.io/v1beta2

bootstrapTokens:

-groups:

  -system:bootstrappers:kubeadm:default-node-token

  token: abcdef.0123456789abcdef

  ttl: 24h0m0s

  usages:

  - signing

  - authentication

kind:InitConfiguration

localAPIEndpoint:

  advertiseAddress: 192.168.40.128

  bindPort: 6443

nodeRegistration:

  criSocket: /var/run/dockershim.sock

  name: localhost.localdomain

  taints:

  - effect: NoSchedule

    key: node-role.kubernetes.io/master

---

apiServer:

  timeoutForControlPlane: 4m0s

apiVersion:kubeadm.k8s.io/v1beta2

certificatesDir:/etc/kubernetes/pki

clusterName:kubernetes

controllerManager:{}

dns:

  type: CoreDNS

etcd:

  local:

    dataDir: /var/lib/etcd

imageRepository:k8s.gcr.io

kind:ClusterConfiguration

kubernetesVersion:v1.17.0

networking:

  dnsDomain: cluster.local

  serviceSubnet: 10.96.0.0/12

scheduler:{}

---

apiVersion:kubeproxy.config.k8s.io/v1alpha1

kind:KubeProxyConfiguration

mode:"ipvs"

8.拉取镜像

[root@localhost~]# kubeadm config images pull --config kubeadm-init.yaml

W121810:48:44.641505   75319 validation.go:28]Cannot validate kube-proxy config - no validator is available

W121810:48:44.641691   75319 validation.go:28]Cannot validate kubelet config - no validator is available

[config/images]Pulled k8s.gcr.io/kube-apiserver:v1.17.0

[config/images]Pulled k8s.gcr.io/kube-controller-manager:v1.17.0

[config/images]Pulled k8s.gcr.io/kube-scheduler:v1.17.0

[config/images]Pulled k8s.gcr.io/kube-proxy:v1.17.0

[config/images]Pulled k8s.gcr.io/pause:3.1

[config/images]Pulled k8s.gcr.io/etcd:3.4.3-0

[config/images]Pulled k8s.gcr.io/coredns:1.6.5
 
[root@localhost~]# docker image ls

REPOSITORY                           TAG                 IMAGE ID            CREATED             SIZE

k8s.gcr.io/kube-proxy                v1.17.0             7d54289267dc        10 days ago         116MB

k8s.gcr.io/kube-apiserver            v1.17.0             0cae8d5cc64c        10 days ago         171MB

k8s.gcr.io/kube-controller-manager   v1.17.0             5eb3b7486872        10 days ago         161MB

k8s.gcr.io/kube-scheduler            v1.17.0             78c190f736b1        10 days ago         94.4MB

k8s.gcr.io/coredns                   1.6.5               70f311871ae1        6 weeks ago         41.6MB

k8s.gcr.io/etcd                      3.4.3-0             303ce5db0e90        7 weeks ago         288MB

k8s.gcr.io/pause                    3.1                 da86e6ba6ca1        24 months ago       742kB

9.添加开机自启并启动kublet

[root@localhost~]# systemctl enable kubelet

[root@localhost~]# systemctl start kubelet

# Kubelet无法启动可能是您的交换分区没有关闭

[root@localhost~]# swapoff -a

10.初始化master节点

[root@localhost~]# kubeadm init --pod-network-cidr=10.244.0.0/16

YourKubernetes control-plane has initialized successfully!

To startusing 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

Youshould now deploy a pod network to the cluster.

Run"kubectl apply -f [podnetwork].yaml" with one of the options listedat:

 https://kubernetes.io/docs/concepts/cluster-administration/addons/

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

kubeadmjoin 192.168.40.128:6443 --token eitxr6.l7que99ui33phdts \

--discovery-token-ca-cert-hashsha256:2b65bf29e32c1906391b66796f3cd5cf79bce239b43ff82fefb73ace984ac294

11.根据提示准备kubeconfig配置文件

[root@localhost ~]# mkdir -p $HOME/.kube

[root@localhost ~]# sudo cp -i /etc/kubernetes/admin.conf$HOME/.kube/config

[root@localhost ~]#  sudochown $(id -u):$(id -g) $HOME/.kube/config

12.查看master的组件是否正常

[root@localhost ~]# kubectl get cs

NAME                STATUS    MESSAGE             ERROR

scheduler           Healthy   ok

controller-manager  Healthy   ok

etcd-0               Healthy   {"health":"true"}

[root@localhost ~]# kubectl get pods -A

NAMESPACE     NAME                                           READY   STATUS    RESTARTS  AGE

kube-system  coredns-6955765f44-q42ch                        1/1     Running  0          3m11s

kube-system  coredns-6955765f44-xld2q                        1/1     Running  0          3m11s

kube-system  etcd-localhost.localdomain                      1/1     Running  0          3m27s

kube-system  kube-apiserver-localhost.localdomain           1/1     Running  0          3m27s

kube-system  kube-controller-manager-localhost.localdomain   1/1    Running   0          3m27s

kube-system  kube-proxy-zb4dq                                1/1     Running  0          3m11s

kube-system   kube-scheduler-localhost.localdomain            1/1     Running  0          3m26s

[root@localhost ~]# kubectl get nodes

NAME                   STATUS   ROLES    AGE    VERSION

localhost.localdomain  Ready    master   4m38s  v1.17.0

13.配置俩台node节点

这行是在master节点初始化完成后提示的

[root@localhost ~]# kubeadm join 192.168.40.128:6443 --tokeneitxr6.l7que99ui33phdts \

>    --discovery-token-ca-cert-hashsha256:2b65bf29e32c1906391b66796f3cd5cf79bce239b43ff82fefb73ace984ac294
W1218 23:48:20.344418    4134join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will beignored when control-plane flag is not set.

[preflight] Running pre-flight checks

       [WARNINGIsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroupdriver. The recommended driver is "systemd". Please follow the guideat https://kubernetes.io/docs/setup/cri/

       [WARNINGService-Kubelet]: kubelet service is not enabled, please run 'systemctl enablekubelet.service'

[preflight] Reading configuration from the cluster...

[preflight] FYI: You can look at this config file with 'kubectl -nkube-system get cm kubeadm-config -oyaml'

[kubelet-start] Downloading configuration for the kubelet from the"kubelet-config-1.17" ConfigMap in the kube-system namespace

[kubelet-start] Writing kubelet configuration to file"/var/lib/kubelet/config.yaml"

[kubelet-start] Writing kubelet environment file with flags to file"/var/lib/kubelet/kubeadm-flags.env"

[kubelet-start] Starting the kubelet

[kubelet-start] Waiting for the kubelet to perform the TLSBootstrap...

This node has joined the cluster:

* Certificate signing request was sent to apiserver and a responsewas received.

* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node jointhe cluster.

在master节点插看是否有子节点的信息

[root@localhost ~]# kubectl get nodes

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