ubuntu20.04使用kubeadm方式搭建k8s
ubuntu20.04使用kubeadm方式搭建k8s系统环境准备配置主机名主机名 IP地址master 172.16.131.130node1 172.16.131.131node2 172.16.131.132配置host解析(每台主机都操作)1 cat >> /etc/hosts << EOF172.16.131.130 master172.16.131.131 no
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ubuntu20.04使用kubeadm方式搭建k8s
系统环境准备
配置主机名
主机名 IP地址
master 172.16.131.130
node1 172.16.131.131
node2 172.16.131.132
配置host解析(每台主机都操作)
1 cat >> /etc/hosts << EOF
172.16.131.130 master
172.16.131.131 node1
172.16.131.132 node2
EOF
一:安装docker
1.1安装apt依赖包,用于通过HTTPS来获取仓库
sudo apt-get install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
1.2添加docker的官方GPG密钥
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
curl -fsSL https://mirrors.ustc.edu.cn/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
1.3设置稳定版仓库
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" #ubuntu官方
sudo add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
1.4安装docker-ce
默认安装最新版本(使用指定安装)
sudo apt-get update sudo apt-get install -y docker-ce docker-ce-cli containerd.io
指定安装------推荐
apt-cache madison docker-ce(列出当前可安装的docker版本)
sudo apt install docker-ce=5:19.03.9~3-0~ubuntu-focal docker-ce-cli=5:19.03.9~3-0~ubuntu-focal
1.5配置daemon.json文件,镜像加速
cat > /etc/docker/daemon.json <<EOF
{
"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"],
"exec-opts":["native.cgroupdriver=systemd"]
}
EOF
sudo systemctl daemon-reload
sudo service docker restart
docker version 或 docker -v
二:关闭防火墙、swap
2.1防火墙
sudo ufw disable
2.2关闭swap
#/swap.img none swap sw 0 0 #在/etc/fstab文件下配置 将这行注释掉
mount -a
sudo swapoff -a
三:安装kubelet、kubeadm、kubectl
3.1添加阿里源 ##云平台服务器不需要添加
deb https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial main #在/etc/apt/sources.list中添加
curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | sudo apt-key add - #添加源的key
sudo apt-get update #更新源
3.2添加 Kubernetes apt
仓库:
echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://apt.kubernetes.io/ kubernetes-xenial main"| sudo tee /etc/apt/sources.list.d/kubernetes.list
3.3开始安装
安装指定版本
sudo apt update
sudo apt install -y kubectl=1.17.12-00 kubeadm=1.17.12-00 kubelet=1.17.12-00
kubelet --version
启动
systemctl start kubelet
四:部署master节点(以上操作所有节点都操作)
4.1下载
固定版本安装
sudo docker pull registry.aliyuncs.com/google_containers/kube-proxy:v1.17.12
sudo docker pull registry.aliyuncs.com/google_containers/kube-apiserver:v1.17.12
sudo docker pull registry.aliyuncs.com/google_containers/kube-controller-manager:v1.17.12
sudo docker pull registry.aliyuncs.com/google_containers/kube-scheduler:v1.17.12
sudo docker pull registry.aliyuncs.com/google_containers/etcd:3.4.3-0
sudo docker pull registry.aliyuncs.com/google_containers/coredns:1.6.5
sudo docker pull registry.aliyuncs.com/google_containers/pause:3.1
kubeadm config images list #获取最新版所需镜像列表
4.2 执行init,初始化k8s
kubeadm init \
--apiserver-advertise-address=172.16.131.130 \
--image-repository registry.aliyuncs.com/google_containers \
--kubernetes-version v1.19.3 \
--service-cidr=10.1.0.0/16 \
--pod-network-cidr=10.2.0.0/16 \
--service-dns-domain=cluster.local \
--ignore-preflight-errors=Swap \
--ignore-preflight-errors=NumCPU
4.3 创建目录
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
4.4 node节点加入集群
kubeadm join 172.16.131.130:6443 --token ohe2ri.mehnmyieotwi7cad \
> --discovery-token-ca-cert-hash sha256:bd498e350bbdf474102aa83545bc16d8ed02bc6f9eab47aaa60fee28faf2a848
4.5 部署flannel网络
cat > kube-flannel.yml << EOF
---
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": "10.2.0.0/16",
"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:v0.13.0
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:v0.13.0
command:
- /opt/bin/flanneld
args:
- --ip-masq
- --kube-subnet-mgr
- --iface=ens33
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
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
EOF
注:修改配置文件,将128行替换为PodIP,在189行新增加一行指定网卡名
vim kube-flannel.yml
128: "Network": "10.2.0.0/16",
189: - --iface=ens33
4.6 应用资源配置清单
kubectl apply -f kube-flannel.yml
4.7 查看pod状态
kubectl -n kube-system get pod :正常应该全是running状态
4.8 重置k8s集群(若有需要)
kubeadm reset
rm -fr $HOME/.kube/config
4.9 支持命令补全
apt-get install bash-completion -y
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
kubectl completion bash >/etc/bash_completion.d/kubectl
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