k8s 1.18.20版本部署
身为k8s初学者，在掌握k8s理论知识的同时，也需要掌握一下实际部署k8s的过程，对于理论的学习起到一定的帮助作用。罗列了一下相关步骤，请各位参考：
一、环境准备
三台虚机：
操作系统： CentOS Linux release 7.9.2009 (Core)
内核版本：3.10.0-1160.88.1.el7.x86_64
k8s-master01: 192.168.66.200
k8s-master02: 192.168.66.201
k8s-node01: 192.168.66.250
本次安装k8s 1.18.20版本
二、服务器初始化配置
服务器初始化配置可以参考原先我写的1.15.0版本部署方案
K8s 1.15.0 版本部署安装_好好学习之乘风破浪的博客-CSDN博客
三、安装docker
3.1、安装指定的Docker版本
yum list docker-ce.x86_64 --showduplicates | sort -r
yum install -y containerd.io-1.6.18 docker-ce-23.0.1 docker-ce-cli-23.0.13.2、创建docker daemon.json文件
mkdir /etc/docker
cat > /etc/docker/daemon.json <四、安装软件包
4.1、安装软件
yum install -y kubelet-1.18.20 kubeadm-1.18.20 kubectl-1.18.20 ipvsadm4.2、配置kubelet
cat > /etc/sysconfig/kubelet <五、部署集群
以下操作在k8s-master01节点上操作
5.1 、生成初始化配置
kubeadm config print init-defaults > kubeadm.yaml
5.1 、生成初始化配置
kubeadm config print init-defaults > kubeadm.yaml[root@k8s-master01 ~]# cat kubeadm.yaml
apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:- system:bootstrappers:kubeadm:default-node-tokentoken: abcdef.0123456789abcdefttl: 24h0m0susages:- signing- authentication
kind: InitConfiguration
localAPIEndpoint:advertiseAddress: 192.168.66.200 ####需要修改为k8s-master01的地址bindPort: 6443
nodeRegistration:criSocket: /var/run/dockershim.sockname: k8s-master01 ####需要修改为k8s-master01的主机名taints:- effect: NoSchedulekey: node-role.kubernetes.io/master
---
apiServer:timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:type: CoreDNS
etcd:local:dataDir: /var/lib/etcd
imageRepository: k8s.gcr.io
kind: ClusterConfiguration
kubernetesVersion: v1.18.20 ####需要修改为v1.18.20
networking:dnsDomain: cluster.localserviceSubnet: 10.96.0.0/12 ####保持默认podSubnet: 10.2.0.0/16 ####新增
scheduler: {}--- ####新增
apiVersion: kubeproxy.config.k8s.io/v1alpha1 ####新增
kind: KubeProxyConfiguration ####新增
mode: ipvs ####新增5.2 、执行初始化配置
kubeadm init --config kubeadm.yaml
成功会显示如下信息
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
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 192.168.66.200:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:8ba059662766394bbc081324dfba0bc6a1360687f99e93a1b5c7c3a1e6d53097
5.3 按照要求执行生成文件
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
5.4 查看组件状态
kubectl get cs
该状态其实不影响整个集群使用，是因为默认的kube-scheduler.yaml和kube-controller-manager.yaml 中默认使用了10251和10252的端口。可以将对应的配置文件中- --port=0 给注释掉
[root@k8s-master01 ~]# sed -i 's/- --port=0/#&/' /etc/kubernetes/manifests/kube-scheduler.yaml
[root@k8s-master01 ~]# sed -i 's/- --port=0/#&/' /etc/kubernetes/manifests/kube-controller-manager.yaml
[root@k8s-master01 ~]# systemctl restart kubelet
5.5、部署flannel组件
mirrors / coreos / flannel · GitCode
可以自行去github,找到 flannel/Documentation/kube-flannel.yml 路径，拷贝出代码，新建文件上传，然后修改为.yml
# vi kube-flannel.yml
将
net-conf.json: |
{
"Network": "10.2.0.0/16", ####修改为podsubnet地址段
"Backend": {
"Type": "vxlan"
}
}
（注：镜像路径可以不用修改）
[root@k8s-master01 ~]# cat kube-flannel.yml
---
kind: Namespace
apiVersion: v1
metadata:name: kube-flannellabels:pod-security.kubernetes.io/enforce: privileged
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:name: flannel
rules:
- apiGroups:- ""resources:- podsverbs:- get
- apiGroups:- ""resources:- nodesverbs:- get- list- watch
- apiGroups:- ""resources:- nodes/statusverbs:- patch
- apiGroups:- "networking.k8s.io"resources:- clustercidrsverbs:- list- watch
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:name: flannel
roleRef:apiGroup: rbac.authorization.k8s.iokind: ClusterRolename: flannel
subjects:
- kind: ServiceAccountname: flannelnamespace: kube-flannel
---
apiVersion: v1
kind: ServiceAccount
metadata:name: flannelnamespace: kube-flannel
---
kind: ConfigMap
apiVersion: v1
metadata:name: kube-flannel-cfgnamespace: kube-flannellabels:tier: nodeapp: 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-dsnamespace: kube-flannellabels:tier: nodeapp: flannel
spec:selector:matchLabels:app: flanneltemplate:metadata:labels:tier: nodeapp: flannelspec:affinity:nodeAffinity:requiredDuringSchedulingIgnoredDuringExecution:nodeSelectorTerms:- matchExpressions:- key: kubernetes.io/osoperator: Invalues:- linuxhostNetwork: truepriorityClassName: system-node-criticaltolerations:- operator: Existseffect: NoScheduleserviceAccountName: flannelinitContainers:- name: install-cni-pluginimage: docker.io/flannel/flannel-cni-plugin:v1.1.2#image: docker.io/rancher/mirrored-flannelcni-flannel-cni-plugin:v1.1.2command:- cpargs:- -f- /flannel- /opt/cni/bin/flannelvolumeMounts:- name: cni-pluginmountPath: /opt/cni/bin- name: install-cniimage: docker.io/flannel/flannel:v0.21.3#image: docker.io/rancher/mirrored-flannelcni-flannel:v0.21.3command:- cpargs:- -f- /etc/kube-flannel/cni-conf.json- /etc/cni/net.d/10-flannel.conflistvolumeMounts:- name: cnimountPath: /etc/cni/net.d- name: flannel-cfgmountPath: /etc/kube-flannel/containers:- name: kube-flannelimage: docker.io/flannel/flannel:v0.21.3#image: quay-mirror.qiniu.com/coreos/flannel:v0.21.3 #image: docker.io/rancher/mirrored-flannelcni-flannel:v0.21.3command:- /opt/bin/flanneldargs:- --ip-masq- --kube-subnet-mgrresources:requests:cpu: "100m"memory: "50Mi"securityContext:privileged: falsecapabilities:add: ["NET_ADMIN", "NET_RAW"]env:- name: POD_NAMEvalueFrom:fieldRef:fieldPath: metadata.name- name: POD_NAMESPACEvalueFrom:fieldRef:fieldPath: metadata.namespace- name: EVENT_QUEUE_DEPTHvalue: "5000"volumeMounts:- name: runmountPath: /run/flannel- name: flannel-cfgmountPath: /etc/kube-flannel/- name: xtables-lockmountPath: /run/xtables.lockvolumes:- name: runhostPath:path: /run/flannel- name: cni-pluginhostPath:path: /opt/cni/bin- name: cnihostPath:path: /etc/cni/net.d- name: flannel-cfgconfigMap:name: kube-flannel-cfg- name: xtables-lockhostPath:path: /run/xtables.locktype: FileOrCreate
应用flannel组件
kubectl apply -f kube-flannel.yml
查询flannel的pod信息
kubectl get pod -n kube-flannel
查看pod和node节点
kubectl get pod -n kube-system
kubectl get node
六、部署node节点
将k8s-node01节点添加到集群中
kubeadm join 192.168.66.200:6443 --token abcdef.0123456789abcdef \
--discovery-token-ca-cert-hash sha256:8ba059662766394bbc081324dfba0bc6a1360687f99e93a1b5c7c3a1e6d53097
查询node节点情况
登录master01节点检查所有组件运行情况
kubectl get pod -A -owide
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