目录
一、准备工作
二、容器运行时
三、安装kubelet 、kubeadm、 kubectl
四、配置CNI
五、安装nginx
一、准备工作
1、更新yum源安装 vim、net-tools等工具（每个节点都执行）
yum update -y
yum install vim -y
yum install net-tools -y2、配置每个节点的网络，然后能互相ping通（每个节点上都要执行）
vi /etc/hosts
192.168.178.141 master
192.168.178.150 node1
192.168.178.151 node23、安装时间插件，保证每个节点时间一致（每个节点上都要执行）
yum install -y chrony
systemctl start chronyd
systemctl enable chronyd4、关闭防火墙（这里为了省事，生产环境请开放相应的端口，每个节点都执行）
systemctl stop firewalld && systemctl disable firewalld5、禁用swap分区（每个节点都执行）
sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab6、禁用SELINUX（每个节点上都要执行）
sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config && setenforce 07、转发 IPv4 并让 iptables 看到桥接流量
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
overlay
br_netfilter
EOF
sudo modprobe overlay
sudo modprobe br_netfilter
# 设置所需的 sysctl 参数，参数在重新启动后保持不变
cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.ipv4.ip_forward = 1
EOF
# 应用 sysctl 参数而不重新启动
sudo sysctl --system
#检查模块是否被加载
lsmod | grep br_netfilter
lsmod | grep overlay
#检查是否设置成功
sysctl net.bridge.bridge-nf-call-iptables net.bridge.bridge-nf-call-ip6tables net.ipv4.ip_forward8、 配置ipvs功能（每个节点上都要执行）
#安装
yum install ipset ipvsadm -y
#配置
cat <<EOF > /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
EOF
#授权
chmod +x /etc/sysconfig/modules/ipvs.modules
#执行
sh +x /etc/sysconfig/modules/ipvs.modules
#查看
lsmod | grep -e ip_vs -e nf_conntrack_ipv49、重启服务器让SELINUX生效
reboot -h now二、容器运行时
k8s支持4中容器运行时，这里介绍containerd方式安装。(每个节点都要安装)
# 添加docker源
curl -L -o /etc/yum.repos.d/docker-ce.repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# 安装containerd
yum install -y containerd.io
# 创建默认配置文件
containerd config default > /etc/containerd/config.toml
# 设置aliyun地址，不设置会连接不上, 如果无法下载镜像检查一下配置是否替换 cat /etc/containerd/config.toml |grep sandbox_image
sed -i "s#registry.k8s.io/pause#registry.aliyuncs.com/google_containers/pause#g" /etc/containerd/config.toml
# 设置驱动为systemd
sed -i 's/SystemdCgroup = false/SystemdCgroup = true/g' /etc/containerd/config.toml
# 设置docker地址为aliyun镜像地址
sed -i '/\[plugins\."io\.containerd\.grpc\.v1\.cri"\.registry\.mirrors\]/a\ [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]\n endpoint = ["https://3kcpregv.mirror.aliyuncs.com" ,"https://registry-1.docker.io"]' /etc/containerd/config.toml
# 重启服务
systemctl daemon-reload
systemctl enable --now containerd
systemctl restart containerd
三、安装kubelet 、kubeadm、 kubectl
1、安装Crictl
cat <<EOF > /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
setenforce 0
# 安装crictl工具
yum install -y cri-tools
# 生成配置文件
crictl config runtime-endpoint
# 编辑配置文件
cat << EOF | tee /etc/crictl.yaml
runtime-endpoint: "unix:///run/containerd/containerd.sock"
image-endpoint: "unix:///run/containerd/containerd.sock"
timeout: 10
debug: false
pull-image-on-create: false
disable-pull-on-run: false
EOF
# 查看是否安装成功,和docker命令差不多
crictl info
crictl images
2、安装kubelet、kubeadm、kubectl
yum install --setopt=obsoletes=0 kubelet-1.27.2-0 kubeadm-1.27.2-0 kubectl-1.27.2-0 -y
systemctl enable kubelet && systemctl start kubelet3、节点初始化（仅在master节点执行）
kubeadm init \
--apiserver-advertise-address=192.168.178.141 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.27.2 \
--service-cidr=10.96.0.0/12 \
--pod-network-cidr=10.244.0.0/16 \
--ignore-preflight-errors=all如果报错执行重置命令
kubeadm reset
rm -fr ~/.kube/ /etc/kubernetes/* var/lib/etcd/*
在master节点执行
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config在node节点执行，加入集群
kubeadm join 192.168.178.141:6443 --token 2jm0vf.l3xyduayvig5w9cv \
--discovery-token-ca-cert-hash sha256:379185fe826631b65fb41bc8d57665742e8cffc0736552cf06dc5423c7e80c41四、配置CNI
1、创建kube-flannel.yml(master节点执行）
cat > kube-flannel.yml << EOF
---
kind: Namespace
apiVersion: v1
metadata:
name: kube-flannel
labels:
pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
rules:
- apiGroups:
- ""
resources:
- pods
verbs:
- get
- apiGroups:
- ""
resources:
- nodes
verbs:
- list
- watch
- apiGroups:
- ""
resources:
- nodes/status
verbs:
- patch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: flannel
subjects:
- kind: ServiceAccount
name: flannel
namespace: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-flannel
labels:
tier: node
app: flannel
data:
cni-conf.json: |
{
"name": "cbr0",
"cniVersion": "0.3.1",
"plugins": [
{
"type": "flannel",
"delegate": {
"hairpinMode": true,
"isDefaultGateway": true
}
},
{
"type": "portmap",
"capabilities": {
"portMappings": true
}
}
]
}
net-conf.json: |
{
"Network": "10.244.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds
namespace: kube-flannel
labels:
tier: node
app: flannel
spec:
selector:
matchLabels:
app: flannel
template:
metadata:
labels:
tier: node
app: flannel
spec:
affinity:
nodeAffinity:
requiredDuringSchedulingIgnoredDuringExecution:
nodeSelectorTerms:
- matchExpressions:
- key: kubernetes.io/os
operator: In
values:
- linux
hostNetwork: true
priorityClassName: system-node-critical
tolerations:
- operator: Exists
effect: NoSchedule
serviceAccountName: flannel
initContainers:
- name: install-cni-plugin
#image: flannelcni/flannel-cni-plugin:v1.1.0 for ppc64le and mips64le (dockerhub limitations may apply)
image: docker.io/rancher/mirrored-flannelcni-flannel-cni-plugin:v1.1.0
command:
- cp
args:
- -f
- /flannel
- /opt/cni/bin/flannel
volumeMounts:
- name: cni-plugin
mountPath: /opt/cni/bin
- name: install-cni
#image: flannelcni/flannel:v0.19.0 for ppc64le and mips64le (dockerhub limitations may apply)
image: docker.io/rancher/mirrored-flannelcni-flannel:v0.19.0
command:
- cp
args:
- -f
- /etc/kube-flannel/cni-conf.json
- /etc/cni/net.d/10-flannel.conflist
volumeMounts:
- name: cni
mountPath: /etc/cni/net.d
- name: flannel-cfg
mountPath: /etc/kube-flannel/
containers:
- name: kube-flannel
#image: flannelcni/flannel:v0.19.0 for ppc64le and mips64le (dockerhub limitations may apply)
image: docker.io/rancher/mirrored-flannelcni-flannel:v0.19.0
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: false
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
- name: EVENT_QUEUE_DEPTH
value: "5000"
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
- name: xtables-lock
mountPath: /run/xtables.lock
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni-plugin
hostPath:
path: /opt/cni/bin
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
- name: xtables-lock
hostPath:
path: /run/xtables.lock
type: FileOrCreate
EOF2、执行
kubectl apply -f kube-flannel.yml3、查看node节点（等待1-2分钟）
kubectl get nodes
五、安装nginx
1、在master执行如下命令
kubectl create deployment nginx --image=nginx
2、暴露端口
kubectl expose deployment nginx --port=80 --type=NodePort
3、查看运行的服务
kubectl get pods,service
4、访问nginx
ip+31201
文章来源：https://www.toymoban.com/news/detail-636834.html
参考：https://blog.csdn.net/qq_36765991/article/details/128702891文章来源地址https://www.toymoban.com/news/detail-636834.html
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