本教程参照 https://kuboard.cn/install/install-k8s.html#%E6%96%87%E6%A1%A3%E7%89%B9%E7%82%B9做了部分修改
Vagrant
文件,使用k8s/base
作为镜像,该镜像安装了docker和1.21.4版本的kubectl、kubelet和kubeadm,Vagrant
文件内容如下(请勿对以下文件做任何修改):# -*- mode: ruby -*-
# vi: set ft=ruby :
Vagrant.require_version ">= 1.6.0"
boxes = [
{
:name => "k8s-master",
:eth1 => "192.168.100.200",
:mem => "2048",
:cpu => "2"
},
{
:name => "k8s-node1",
:eth1 => "192.168.100.201",
:mem => "1024",
:cpu => "2"
}
]
Vagrant.configure(2) do |config|
config.vm.box = "k8s/base"
config.ssh.username = "root"
config.ssh.password = "root"
boxes.each do |opts|
config.vm.define opts[:name] do |config|
config.vm.hostname = opts[:name]
config.vm.provider "vmware_fusion" do |v|
v.vmx["memsize"] = opts[:mem]
v.vmx["numvcpus"] = opts[:cpu]
end
config.vm.provider "virtualbox" do |v|
v.customize ["modifyvm", :id, "--memory", opts[:mem]]
v.customize ["modifyvm", :id, "--cpus", opts[:cpu]]
end
config.vm.network :private_network, ip: opts[:eth1]
end
end
end
vagrant up
命令启动服务器,服务器启动完成后使用以下命令读取docker镜像:# 注意,该步骤并非是必须的,可以跳过,预先导入仅仅是因为部分镜像下载较慢
docker load -i coredns.tar
docker load -i etcd.tar
docker load -i flannel.tar
docker load -i kube-apiserver.tar
docker load -i kube-controller-manager.tar
docker load -i kube-proxy.tar
docker load -i kube-scheduler.tar
docker load -i tigera-operator.tar
init_master.sh
文件,内容如下:#!/bin/bash
# 只在 master 节点执行
# 脚本出错时终止执行
set -e
if [ ${#POD_SUBNET} -eq 0 ] || [ ${#APISERVER_NAME} -eq 0 ]; then
echo -e "\033[31;1m请确保您已经设置了环境变量 POD_SUBNET 和 APISERVER_NAME \033[0m"
echo 当前POD_SUBNET=$POD_SUBNET
echo 当前APISERVER_NAME=$APISERVER_NAME
exit 1
fi
# 查看完整配置选项 https://godoc.org/k8s.io/kubernetes/cmd/kubeadm/app/apis/kubeadm/v1beta2
rm -f ./kubeadm-config.yaml
cat <<EOF > ./kubeadm-config.yaml
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
localAPIEndpoint:
advertiseAddress: "${MASTER_IP}"
bindPort: 6443
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v${1}
imageRepository: registry.aliyuncs.com/k8sxio
controlPlaneEndpoint: "${APISERVER_NAME}:6443"
networking:
serviceSubnet: "10.96.0.0/16"
podSubnet: "${POD_SUBNET}"
dnsDomain: "cluster.local"
dns:
type: CoreDNS
imageRepository: swr.cn-east-2.myhuaweicloud.com${2}
imageTag: 1.8.0
---
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
cgroupDriver: systemd
EOF
# kubeadm init
# 根据您服务器网速的情况,您需要等候 3 - 10 分钟
echo ""
echo "抓取镜像,请稍候..."
kubeadm config images pull --config=kubeadm-config.yaml
echo ""
echo "初始化 Master 节点"
kubeadm init --config=kubeadm-config.yaml --upload-certs
# 配置 kubectl
rm -rf /root/.kube/
mkdir /root/.kube/
cp -i /etc/kubernetes/admin.conf /root/.kube/config
kubernetes
主节点:export MASTER_IP=192.168.100.200
export APISERVER_NAME=apiserver.dns
export POD_SUBNET=10.100.0.0/16
echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts
./init_master.sh 1.21.4 /coredns
export POD_SUBNET=10.100.0.0/16
kubectl apply -f https://kuboard.cn/install-script/v1.21.x/calico-operator.yaml
新建flannel-v0.14.0.yaml
文件,内容如下:
---
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: psp.flannel.unprivileged
annotations:
seccomp.security.alpha.kubernetes.io/allowedProfileNames: docker/default
seccomp.security.alpha.kubernetes.io/defaultProfileName: docker/default
apparmor.security.beta.kubernetes.io/allowedProfileNames: runtime/default
apparmor.security.beta.kubernetes.io/defaultProfileName: runtime/default
spec:
privileged: false
volumes:
- configMap
- secret
- emptyDir
- hostPath
allowedHostPaths:
- pathPrefix: "/etc/cni/net.d"
- pathPrefix: "/etc/kube-flannel"
- pathPrefix: "/run/flannel"
readOnlyRootFilesystem: false
# Users and groups
runAsUser:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
fsGroup:
rule: RunAsAny
# Privilege Escalation
allowPrivilegeEscalation: false
defaultAllowPrivilegeEscalation: false
# Capabilities
allowedCapabilities: ['NET_ADMIN', 'NET_RAW']
defaultAddCapabilities: []
requiredDropCapabilities: []
# Host namespaces
hostPID: false
hostIPC: false
hostNetwork: true
hostPorts:
- min: 0
max: 65535
# SELinux
seLinux:
# SELinux is unused in CaaSP
rule: 'RunAsAny'
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
name: flannel
rules:
- apiGroups: ['extensions']
resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames: ['psp.flannel.unprivileged']
- 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-system
---
apiVersion: v1
kind: ServiceAccount
metadata:
name: flannel
namespace: kube-system
---
kind: ConfigMap
apiVersion: v1
metadata:
name: kube-flannel-cfg
namespace: kube-system
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": "10.100.0.0/16",
"Backend": {
"Type": "vxlan"
}
}
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
name: kube-flannel-ds
namespace: kube-system
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
image: quay.io/coreos/flannel:v0.14.0
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: quay.io/coreos/flannel:v0.14.0
command:
- /opt/bin/flanneld
args:
- --ip-masq=false
- --kube-subnet-mgr
- --iface=enp0s8
resources:
requests:
cpu: "100m"
memory: "50Mi"
limits:
cpu: "100m"
memory: "50Mi"
securityContext:
privileged: true
capabilities:
add: ["NET_ADMIN", "NET_RAW"]
env:
- name: POD_NAME
valueFrom:
fieldRef:
fieldPath: metadata.name
- name: POD_NAMESPACE
valueFrom:
fieldRef:
fieldPath: metadata.namespace
volumeMounts:
- name: run
mountPath: /run/flannel
- name: flannel-cfg
mountPath: /etc/kube-flannel/
volumes:
- name: run
hostPath:
path: /run/flannel
- name: cni
hostPath:
path: /etc/cni/net.d
- name: flannel-cfg
configMap:
name: kube-flannel-cfg
此处注意,args下添加--iface=enp0s8
参数,主要是指定对应的网卡,因为virtualbox
指定了两张网卡,其中NAT
网卡虚拟机之间是无法通讯的,需指定Host-Only
网卡,否则集群pod之间无法通讯,此处的enp0s8
即Host-Only
对应的网卡,请按照实际填写。
## 执行下面命令,完成网络初始化
kubectl apply -f ./flannel-v0.14.0.yaml
## 执行下面命令,查看集群运行状态
kubectl get pod -n kube-system -o wide
## 如果是下面的样子,说明集群初始化完成
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
coredns-7d75679df-gg8bc 1/1 Running 0 4m15s 10.100.0.2 k8s-master <none> <none>
coredns-7d75679df-n47fx 1/1 Running 0 4m15s 10.100.0.3 k8s-master <none> <none>
etcd-k8s-master 1/1 Running 0 4m28s 192.168.100.200 k8s-master <none> <none>
kube-apiserver-k8s-master 1/1 Running 0 4m28s 192.168.100.200 k8s-master <none> <none>
kube-controller-manager-k8s-master 1/1 Running 0 4m28s 192.168.100.200 k8s-master <none> <none>
kube-flannel-ds-m4pl4 1/1 Running 0 28s 192.168.100.200 k8s-master <none> <none>
kube-proxy-vlqwt 1/1 Running 0 4m16s 192.168.100.200 k8s-master <none> <none>
kube-scheduler-k8s-master 1/1 Running 0 4m28s 192.168.100.200 k8s-master <none> <none>
Worker节点
初始化# 现在 master 节点执行,获取加入集群的命令
kubeadm token create --print-join-command
# 只在 worker 节点执行
export MASTER_IP=192.168.100.200
export APISERVER_NAME=apiserver.dns
echo "${MASTER_IP} ${APISERVER_NAME}" >> /etc/hosts
# 替换为 master 节点上 kubeadm token create 命令的输出
kubeadm join apiserver.dns:6443 --token mpfjma.4vjjg8flqihor4vt --discovery-token-ca-cert-hash sha256:6f7a8e40a810323672de5eee6f4d19aa2dbdb38411845a1bf5dd63485c43d303
# 只在 master 节点执行
kubectl get nodes
##出现以下打印,说明集群加入worker节点成功
NAME STATUS ROLES AGE VERSION
k8s-master Ready control-plane,master 15m v1.21.4
k8s-node1 Ready <none> 35s v1.21.4
k8s/base
镜像,可以在系统初始化完成后执行以下脚本(保存为install_kubelet.sh
,然后执行 ./install_kubelet.sh 1.21.4
; 1.21.4
为kubelet
版本号,请勿修改):# 请根据实际情况修改
#!/bin/bash
# 在 master 节点和 worker 节点都要执行
# 指定镜像源
export REGISTRY_MIRROR=https://registry.cn-hangzhou.aliyuncs.com
# 设置hosts
cat >> /etc/hosts << EOF
192.168.100.200 k8s-master
192.168.100.201 k8s-node1
192.168.100.202 k8s-node2
EOF
# Apply sysctl params without reboot
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system
# 设置 yum repository
yum install -y yum-utils device-mapper-persistent-data lvm2
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
# 安装docker
yum install -y docker-ce-20.10.8-3.el7.x86_64
mkdir -p /etc/docker
cat <<EOF | sudo tee /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"],
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2"
}
EOF
sudo systemctl enable docker
sudo systemctl daemon-reload
sudo systemctl restart docker
# 安装 nfs-utils
# 必须先安装 nfs-utils 才能挂载 nfs 网络存储
yum install -y nfs-utils
yum install -y wget
# 关闭 防火墙
systemctl stop firewalld
systemctl disable firewalld
# 关闭 SeLinux
setenforce 0
sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
# 关闭 swap
swapoff -a
yes | cp /etc/fstab /etc/fstab_bak
cat /etc/fstab_bak |grep -v swap > /etc/fstab
# 配置K8S的yum源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
# 卸载旧版本
yum remove -y kubelet kubeadm kubectl
# 安装kubelet、kubeadm、kubectl
# 将 ${1} 替换为 kubernetes 版本号,例如 1.20.1
yum install -y kubelet-${1} kubeadm-${1} kubectl-${1}
# 重启 docker,并启动 kubelet
systemctl daemon-reload
systemctl enable kubelet && systemctl start kubelet
docker --version
kubelet --version
链接: https://pan.baidu.com/s/11fuFjBw-xDYkWZSYXNmkIQ 提取码: s26o
flannel
网络不通:目前还不知道该问题的原因,但是重启
docker
可以解决问题。
systemctl daemon-reload
systemctl restart docker