使用k8s部署Nginx服务,Nginx对外提供服务只希望部署在其中一台主机，该主机不提供其他服务

一.设置标签及污点

为了保证nginx之能分配到nginx服务器需要设置标签和污点，设置标签可以让Pod选择该服务器部署，设置污点可以使其他服务Pod无法部署在该服务器

本次部署nginx服务器IP为192.168.1.232

设置标签

#设置标签 key为typevalue为nginx

kubectl label node 192.168.1.232 type=nginx

#查看标签

kubectl get node 192.168.1.232 --show-labels

NAME STATUS ROLES AGE VERSION LABELS

192.168.1.232 Ready 30h v1.17.4 kubernetes.io/arch=amd64,kubernetes.io/hostname=192.168.1.232,kubernetes.io/os=linux,type=nginx

设置污点

#给node192.168.1.232设置污点key为key值为nginx effec为NoSchedule永不调度

#除非在Pod里设置了对应的tolerations参数

kubectl taint node 192.168.1.232 key=nginx:NoSchedule

查看污点

kubectl describe node 192.168.1.232

二.设置Nginx-deployment的yaml文件

# cat nginx-deployment.yaml

apiVersion: apps/v1

kind: Deployment

metadata:

labels:

app: nginx

name: nginx-deployment

spec:

replicas: 1

selector:

matchLabels:

app: nginx

template:

metadata:

labels:

app: nginx

spec:

containers:

- image: nginx:1.14.0

name: nginx

#标签选择器

nodeSelector:

type: nginx

#设置污点可以调度到对应服务器

tolerations:

- key: "key"

operator: "Equal"

value: "nginx"

effect: "NoSchedule"

应用启动

kubectl apply -f nginx-deployment.yaml

查看已经调度到对应的服务器

# kubectl get pod -o wide

NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES

nginx-deployment-57f94c46b4-5whb5 1/1 Running 0 6h30m 172.17.97.3 192.168.1.232

三.设置Nginx配置文件和程序根目录挂载

启动的Nginx使用默认的配置文件和默认的网站根目录，需要使用volume挂载

# cat nginx-deployment.yaml

apiVersion: apps/v1

kind: Deployment

metadata:

labels:

app: nginx

name: nginx-deployment

spec:

replicas: 1

selector:

matchLabels:

app: nginx

template:

metadata:

labels:

app: nginx

spec:

containers:

- image: nginx:1.14.0

name: nginx

volumeMounts:

- name: conf

mountPath: /etc/nginx

- name: opt

mountPath: /opt

#标签选择器

nodeSelector:

type: nginx

#设置污点可以调度到对应服务器

tolerations:

- key: "key"

operator: "Equal"

value: "nginx"

effect: "NoSchedule"

volumes:

- name: conf

hostPath:

path: /etc/nginx

type: Directory

- name: opt

hostPath:

path: /opt

type: Directory

本次使用了本机挂载hostPath挂载配置文件及根目录，生产环境最好使用pvc挂载

四.设置Service对外提供服务

# cat nginx-service.yaml

apiVersion: v1

kind: Service

metadata:

labels:

app: nginx

name: nginx-deployment

spec:

ports:

- port: 80

name: nginx-service80

protocol: TCP

targetPort: 80

nodePort: 80

- port: 81

name: nginx-service81

protocol: TCP

targetPort: 81

nodePort: 81

selector:

app: nginx

type: NodePort

PS：使用NodePort启用端口对外提供服务，如果对外映射多个端口需要在port参数下加参数name定义名称，单个端口无需设置参数name

k8s默认使用NodePort对外映射端口为30000-50000如需要映射其他端口需要修改配置文件/opt/kubernetes/cfg/kube-apiserver，修改端口范围