Kubernetes之使用Kubernetes部署Nginx服务
<p> 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</p><h3> 一.设置标签及污点</h3>
<p> 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</p>
<p> 本次部署nginx服务器IP为192.168.1.232</p>
<p> 设置标签</p>
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<pre class="brush:html;gutter:true;">#设置标签 key为typevalue为nginx
kubectl label node 192.168.1.232type=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 <none> 30h v1.17.4 kubernetes.io/arch=amd64,kubernetes.io/hostname=192.168.1.232,kubernetes.io/os=linux,type=nginx
</pre>
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<p> 设置污点</p>
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<pre class="brush:html;gutter:true;">#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
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<p> 查看污点</p>
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<pre class="brush:html;gutter:true;">kubectl describe node 192.168.1.232
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<p> <img src="https://img2020.cnblogs.com/blog/1144139/202003/1144139-20200331163601349-856283905.png"> </p>
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<h3> 二.设置Nginx-deployment的yaml文件</h3>
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<pre class="brush:html;gutter:true;"># 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"
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<p> 应用启动</p>
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<pre class="brush:html;gutter:true;"> kubectl apply -f nginx-deployment.yaml
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<p> 查看已经调度到对应的服务器</p>
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<pre class="brush:html;gutter:true;"># 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 <none> <none>
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<h3> 三.设置Nginx配置文件和程序根目录挂载</h3>
<p> 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</p>
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<pre class="brush:html;gutter:true;"># 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
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<p> 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</p>
<h3> 四.设置Service对外提供服务</h3>
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<pre class="brush:html;gutter:true;"># 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
</pre>
</div>
<p> 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</p>
<p> 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</p>
<p><img src="https://img2020.cnblogs.com/blog/1144139/202003/1144139-20200331164633249-2062180490.png"></p>
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来源：https://www.cnblogs.com/minseo/p/12606256.html
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