k8s搭建1.23版本

1、前期准备

• 以下操作所有主机都要运行的

1、关闭防火墙和selinux

systemctl stop firewalld.service
systemctl disable firewalld.servicesetenforce 0
vim /etc/selinux/config

2、关闭交换分区

• 如果有交换分区的话，关掉，不需要交换分区(占用磁盘)

3、修改主机名和免密登录

[root@localhost ~]# hostnamectl set-hostname master
[root@localhost ~]# bash
[root@master ~]# [root@localhost ~]# hostnamectl set-hostname node1
[root@localhost ~]# bash
[root@node1 ~]# [root@master ~]# echo "192.168.200.10 master" >> /etc/hosts
[root@master ~]# echo "192.168.200.11 node1" >> /etc/hosts
[root@master ~]# scp /etc/hosts root@node1:/etc/host
host.conf    hostname     hosts        hosts.allow  hosts.deny   
[root@master ~]# scp /etc/hosts root@node1:/etc/hosts
The authenticity of host 'node1 (192.168.200.11)' can't be established.
ECDSA key fingerprint is SHA256:ZJD5+SX9K5TIrhruYNsYjv8xCrndEXt4yrdCt077ejw.
ECDSA key fingerprint is MD5:bc:c9:43:fd:b0:19:f8:5e:15:a0:14:f2:ac:17:13:ff.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'node1,192.168.200.11' (ECDSA) to the list of known hosts.
root@node1's password: 
hosts                                                      100%  201   267.3KB/s   00:00    [root@master ~]# ssh-keygen 
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:I8nt/Be5ue9Rq2/u/zYvYCSgAQEHR15sYvwpIcFkqwE root@master
The key's randomart image is:
+---[RSA 2048]----+
|Eo***+.          |
|..o==.+ .        |
|. .o.= + .       |
| o  ..+o  . .    |
|.    .+ S  o .  .|
|       + .  =  ..|
|        o  . =.. |
|         .  + o+.|
|          ...=B*O|
+----[SHA256]-----+
[root@master ~]# ssh-copy-id root@node1
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@node1's password: Number of key(s) added: 1Now try logging into the machine, with:   "ssh 'root@node1'"
and check to make sure that only the key(s) you wanted were added.[root@master ~]# ssh root@node1
Last login: Sun Nov 17 13:33:50 2024 from 192.168.200.1
[root@node1 ~]# 

4、内核参数

[root@master yum.repos.d]# cat /etc/sysctl.d/k8s.conf 
net.bridge.bridge-nf-call-ip6tables = 1  # 启用对ipv6流量的桥接网络数据包的iptables的过滤功能，走iptables的规则
net.bridge.bridge-nf-call-iptables = 1  # 对ipv4的iptables的过滤功能
net.ipv4.ip_forward = 1    # 启动对ipv4数据包的转发功能；pod想要访问外网或者访问另外一个Pod,这个功能必须打开，否则系统只会管自己，不会帮别人转发数据包，就是只会管理发给自己的数据包的请求，不是自己的请求不会管modprobe br_netfilter  # 加载linux内核模块[root@master yum.repos.d]# sysctl -p /etc/sysctl.d/k8s.conf   # 加载指定配置文件的参数值，立即生效
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1

5、安装docker

• 有一个重要的点就是kubelet使用的是systemd驱动，docker使用的cgroupfs驱动，有冲突

yum -y install  yum-utilsyum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repoyum -y install docker-ce# docker拉取的镜像仓库地址
[root@master /]# cat /etc/docker/daemon.json 
{"registry-mirrors": ["https://registry.aliyuncs.com"],"exec-opts": ["native.cgroupdriver=systemd"]   # 驱动设置为systemd
}systemctl enable docker --now

6、安装k8s源

[root@master /]# 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

2、安装

1、安装k8s软件包

• 所有主机都要安装

# 指定版本
[root@master ~]# yum -y install kubelet-1.23.0 kubeadm-1.23.0 kubectl-1.23.0# 列出所安装需要的核心镜像
[root@master ~]# kubeadm config images list
I1117 14:17:57.019109    2908 version.go:255] remote version is much newer: v1.31.2; falling back to: stable-1.23
k8s.gcr.io/kube-apiserver:v1.23.17   # 但是这些镜像国内访问不了，使用阿里云上面的镜像即可
k8s.gcr.io/kube-controller-manager:v1.23.17
k8s.gcr.io/kube-scheduler:v1.23.17
k8s.gcr.io/kube-proxy:v1.23.17
k8s.gcr.io/pause:3.6
k8s.gcr.io/etcd:3.5.1-0
k8s.gcr.io/coredns/coredns:v1.8.6# 开机自启，等会后面会自己启动的
[root@master ~]# systemctl enable kubelet
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.# 阿里云仓库地址
https://registry.aliyuncs.com/google_containers 

2、初始化k8s

kubeadm init --apiserver-advertise-address=192.168.200.10 --kubernetes-version=v1.23.0 --service-cidr=10.96.0.0/16 --pod-network-cidr=10.244.0.0/16 --image-repository=registry.aliyuncs.com/google_containers--apiserver-advertise-address # 控制节点的ip地址--kubernetes-version=v1.23.0 # k8s的版本--service-cidr   # 指定使用的网络地址，dns和svc的范围，会从这个里面进行分配--pod-network-cid  # 指定pod分配的地址范围--image-repository # 指定拉取控制平面组件的镜像仓库# 主要就是安装和配置api server,controller manager，scheduler等组件# 生成一个config文件# 还有加入的命令,就是那个join

3、安装calico网络插件

wget  https://docs.projectcalico.org/v3.21/manifests/calico.yaml# 修改里面的配置，否则会警告，当然也可以不修改
policy/v1beta1 改成policy/v1 # 因为高版本的k8s逐步的启用这个api了
‘kubectl -f https://docs.projectcalico.org/v3.21/manifests/calico.yaml

4、检查

[root@master ~]# kubectl get pod -A
NAMESPACE     NAME                                       READY   STATUS    RESTARTS      AGE
default       busybox                                    1/1     Running   0             32m
kube-system   calico-kube-controllers-7f76d48f74-5zfg9   1/1     Running   0             44m
kube-system   calico-node-jnqkl                          1/1     Running   0             44m
kube-system   calico-node-mwhnh                          1/1     Running   0             44m
kube-system   coredns-6d8c4cb4d-kt7df                    1/1     Running   0             52m
kube-system   coredns-6d8c4cb4d-rsr6j                    1/1     Running   0             52m
kube-system   etcd-master                                1/1     Running   1 (41m ago)   52m
kube-system   kube-apiserver-master                      1/1     Running   1 (41m ago)   52m
kube-system   kube-controller-manager-master             1/1     Running   1 (41m ago)   52m
kube-system   kube-proxy-7cwv7                           1/1     Running   1 (41m ago)   51m
kube-system   kube-proxy-j5fph                           1/1     Running   1 (41m ago)   52m
kube-system   kube-scheduler-master                      1/1     Running   1 (41m ago)   52m[root@master ~]# kubectl get node
NAME     STATUS   ROLES                  AGE   VERSION
master   Ready    control-plane,master   53m   v1.23.0
node1    Ready    <none>                 51m   v1.23.0# 当然，也可以创建一个pod出来，测试能否访问外网