rocky8.9配置K8S集群kubernetes,centos同理

rocky8.9配置K8S集群
节点 主机名 IP地址
master tang1 192.168.211.101
node1 tang2 192.168.211.102
node2 tang3 192.168.211.103

1)准备工作

全部主机都配置静态ip

vi /etc/sysconfig/network-scripts

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=ensxxx
UUID=xxxxxxxxxxxxx
DEVICE=ens32
ONBOOT=yes
IPADDR=192.168.211.101
DNS1=114.114.114.114
NETMASK=255.255.255.0

nmcli connection reload(表示加载配置信息)
nmcli connection up 网卡名,两条命令都要运行才可以

# 关闭 firewalld 防火墙
$ systemctl stop firewalld
$ systemctl disable firewalld
$ setenforce 0
$ sed -ri 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config  # 永久关闭 SELinux

# 临时禁用 swap
$ swapoff -a
$ sed -i '/.*swap.*/d' /etc/fstab  # 永久禁用 swap

# 配置 /etc/hosts
$ cat > /etc/hosts << EOF
192.168.211.101 tang1
192.168.211.102 tang2
192.168.211.103 tang3
EOF

将桥接的ipv4流量传递到iptables链

modprobe br_netfilter  ##生成bridge相关内核参数

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

sysctl --system # 生效

打开端口转发

echo "net.ipv4.ip_forward = 1"  >> /etc/sysctl.conf
sysctl -p

时间同步

yum install -y chrony;
systemctl start chronyd;
systemctl enable chronyd

2)安装containerd(三个节点上操作)

先安装yum-utils工具

yum install -y yum-utils

配置Docker官方的yum仓库,如果做过,可以跳过

yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo

安装containerd

yum install containerd.io -y

启动服务

systemctl enable containerd
systemctl start containerd

生成默认配置

containerd  config default > /etc/containerd/config.toml

修改配置

vi  /etc/containerd/config.toml
sandbox_image = "registry.cn-hangzhou.aliyuncs.com/google_containers/pause:3.8"   # 修改为阿里云镜像地址
SystemdCgroup = true  

重启containerd服务

systemctl restart containerd

3)配置kubernetes仓库(三个节点都操作)

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

说明:kubernetes用的是RHEL7的源,和8是通用的

4)安装kubeadm和kubelet(三个节点都操作)

查看所有版本

yum  --showduplicates list kubeadm  #都选择y

安装1.26.2版本,有新版本可以选择新版本

yum install -y kubelet-1.26.2 kubeadm-1.26.2 kubectl-1.26.2

启动kubelet服务

systemctl start kubelet.service
systemctl enable kubelet.service

5)设置crictl连接 containerd(三个节点都操作)

crictl config --set runtime-endpoint=unix:///run/containerd/containerd.sock

6)初始化(master上)

kubeadm init --image-repository=registry.cn-hangzhou.aliyuncs.com/google_containers --apiserver-advertise-address=192.168.211.103 --kubernetes-version=v1.26.2  --service-cidr=10.15.0.0/16  --pod-network-cidr=10.18.0.0/16
#修改ip地址为master节点,只需要master主机修改就可以


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 192.168.211.103:6443 --token 4mvr8t.tqjjac69wg7vtk7x \
        --discovery-token-ca-cert-hash sha256:6d2f9a8ebc144c3aea5a199a17310adbcfd0fa8605270bc84bd1ae02c82e90b4 
说明: 上面这条命令就是如果需要将node节点加入到集群需要执行的命令,这个token有效期为24小时,如果过期,可以使用下面命令获取

kubeadm token create --print-join-command

7)创建目录(master)

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

获取节点信息:

kubectl get node 
kubectl get pod --all-namespaces

8)node节点上加入master(两个节点主机都执行)

kubeadm join 192.168.211.103:6443 --token 4mvr8t.tqjjac69wg7vtk7x \
        --discovery-token-ca-cert-hash sha256:6d2f9a8ebc144c3aea5a199a17310adbcfd0fa8605270bc84bd1ae02c82e90b4 

安装calico网络(master节点上)

curl https://raw.githubusercontent.com/projectcalico/calico/v3.25.0/manifests/calico.yaml -O

下载完后还需要修改⾥⾯定义 Pod ⽹络(CALICO_IPV4POOL_CIDR),与前⾯ kubeadm init 的 --podnetwork-cidr 指定的⼀样

vi calico.yaml

vim calico.yaml
# - name: CALICO_IPV4POOL_CIDR
# value: "192.168.0.0/16"
# 修改为:
- name: CALICO_IPV4POOL_CIDR
  value: "10.18.0.0/16"

部署

kubectl apply -f calico.yaml

查看

kubectl get pods -n kube-system
kubectl get node
#如果想在节点上运行这条命令,要把master创建的目录复制到节点上,需要:
yum install -y rsync
rsync -av $HOME/.kube/ tang2:/root/.kube/
运行,拷贝到哪台主机需要修改主机名,tang?:
scp -r /root/.kube/ tang2:/root/.kube/

9)安装dashboard(master上)

步骤略

  1. 在K8s里快速部署一个应用

1)创建deployment

kubectl create deployment testdp --image=nginx:1.23.2  ##deploymnet名字为testdp 镜像为nginx:1.23.2

2)查看deployment

kubectl get deployment

3)查看pod

kubectl get pods

4)查看pod详情

kubectl describe pod testdp-68dc848667-d6xhg  #根据自己的name值去看

5)创建service,暴漏pod端口到node节点上

kubectl expose deployment testdp --port=80 --type=NodePort --target-port=80 --name=testsvc

6)查看service

kubectl get svc
NAME         TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.15.0.1              443/TCP        156m
testsvc      NodePort    10.15.248.16           80:30360/TCP   8s

192.168.211.102:30360

rocky8.9配置K8S集群kubernetes,centos同理_第1张图片

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