目录
环境准备
可参考官方文档
Installing kubeadm | Kubernetes
系统规划
| 虚拟机 | cpu | 内存 | 硬盘 | 系统版本 | 网络 | hostname |
| master | 2c | 2G | 20G | Centos 7.9 | 192.168.146.129 | master |
| node1 | 2c | 2G | 20G | Centos 7.9 | 192.168.146.132 | node1 |
| node2 | 2c | 2G | 20G | Centos 7.9 | 192.168.146.133 | node2 |
配置免密
方便后续拷贝文件，不是必须操作
master主机上执行：
ssh-keygen将密钥拷贝给master和node1还有node2
ssh-copy-id master
ssh-copy-id node1
ssh-copy-id node2ssh测试不需要密码即可
ssh node1将桥接的IPv4流量传递到iptables的链
三台主机均执行：
cat > /etc/sysctl.d/k8s.conf << EOF
net.ipv4.ip_forward = 1
net.ipv4.tcp_tw_recycle = 0
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system 
系统基础配置
三台主机均执行：
三台主机分别执行：
hostnamectl set-hostname master
hostnamectl set-hostname node1
hostnamectl set-hostname node2安装docker
安装docker及基础依赖
yum update
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install -y docker-ce docker-ce-cli containerd.io
systemctl start docker
systemctl enable docker
配置docker的仓库下载地址
cat /etc/docker/daemon.json
{
"registry-mirrors": ["https://uj9wvi24.mirror.aliyuncs.com"]
}
systemctl daemon-reload
systemctl restart docker部署k8s
添加阿里云的k8s源
三台主机均执行：
cat /etc/yum.repos.d/kubernetes.repo [k8s]
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
安装kubeadm，kubelet和kubectl
三台主机均执行：
yum install -y kubelet-1.16.2 kubeadm-1.16.2 kubectl-1.16.2
systemctl start kubelet
systemctl enable kubelet初始化masteer节点
master上执行：
kubeadm init --apiserver-advertise-address=192.168.146.129 --image-repository registry.aliyuncs.com/google_containers --service-cidr=10.1.0.0/16 --pod-network-cidr=172.20.0.0/16显示如图：successfully即成功
接着参考如上输出提示，执行以下命令
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config部署node节点
根据实际的master节点IP及生成的token去加入
kubeadm join 192.168.146.129:6443 --token x1kore.eey7qi8rrien3fk0 --discovery-token-ca-cert-hash sha256:dc01d3e1abadd3dd36910c9e4c0c204b77dae97268ea67fd988a9190aabcf6d5部署flannel网络插件
Flannel实质上是一种“覆盖网络(overlaynetwork)”，也就是将TCP数据包装在另一种网络包里面进行路由转发和通信，目前已经支持udp、vxlan、host-gw、aws-vpc、gce和alloc路由等数据转发方式，默认的节点间数据通信方式是UDP转发。
它的功能是让集群中的不同节点主机创建的Docker容器都具有全集群唯一的虚拟IP地址。
Flannel的设计目的就是为集群中的所有节点重新规划IP地址的使用规则，从而使得不同节点上的容器能够获得同属一个内网且不重复的IP地址，并让属于不同节点上的容器能够直接通过内网IP通信。
Flannel是作为一个二进制文件的方式部署在每个node上，主要实现两个功能：
- 为每个node分配subnet，容器将自动从该子网中获取IP地址
- 当有node加入到网络中时，为每个node增加路由配置
下载插件
参考的如下博客：
k8s安装网络插件-flannel_k8s安装flannel网络插件-CSDN博客
复制以下文件内容
cat kube-flannel.yml---
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
runAsUser:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
fsGroup:
rule: RunAsAny
allowPrivilegeEscalation: false
defaultAllowPrivilegeEscalation: false
allowedCapabilities: ['NET_ADMIN', 'NET_RAW']
defaultAddCapabilities: []
requiredDropCapabilities: []
hostPID: false
hostIPC: false
hostNetwork: true
hostPorts:
- min: 0
max: 65535
seLinux:
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": "172.20.0.0/16",
"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-plugin
image: 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: rancher/mirrored-flannelcni-flannel:v0.18.1
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: rancher/mirrored-flannelcni-flannel:v0.18.1
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
应用flannel文件
kubectl apply -f kube-flannel.yml
查看flannel状态
查看所有命名空间（flannel正在初始化）
flannel初始化完成后，状态为running，随之coredns服务也正常了
部署kuboard
wget https://kuboard.cn/install-script/kuboard.yaml
查看kuboard所需的镜像
grep image kuboard.yaml
image: eipwork/kuboard:latest
imagePullPolicy: Always所有节点下载kuboard镜像
docker pull eipwork/kuboard:latest
修改kuboard.yaml文件
修改镜像下载策略为IfNotPresent
vim kuboard.yaml
grep image kuboard.yaml
image: eipwork/kuboard:latest
imagePullPolicy: IfNotPresent应用kuboard文件
kubectl apply -f kuboard.yaml查看token
查看访问kuboard的端口及获取kuboard登录的token
kubectl get all -n kube-system | grep kuboard
echo $(kubectl -n kube-system get secret $(kubectl -n kube-system get secret | grep kuboard-user | awk '{print $1}') -o go-template='{{.data.token}}' | base64 -d)
访问kuboard
浏览器访问：http://192.168.146.129:32567/
将token复制进去
简单创建个应用
创建名称空间
点击创建的test命名空间的控制器
创建deployment
不明白的可以点击在线文档
创建nginx容器
参考在线文档的示例去创建
保存应用
基本上没报错就可以了
查看容器
访问容器
——————至此，k8s部署及简单应用的流程是ok的——————
