本文来自流媒体直播集群SRS的官方wiki(https://github.com/ossrs/srs/wiki/v4_CN_K8s),由SRS的创始作者杨成立授权发布。
文 / 杨成立
本章描述了基于K8s,如何构建Origin Cluster支持超多推流场景。
Origin Cluster通过配置其他源站的信息,在本源站没有流时查询到流的位置,通过RTMP302定向到指定源站,具体原理可以参考#464。主要应用场景如下:
在这个场景下,对比K8s和传统使用方式的差异:
Step 1: 由于SRS和Nginx不在一个Pod可能也不在一个Node,需要创建依赖的PV(Persistent Volume)持久化卷,可购买NAS例如:
在NAS基础上可以创建PV,以及PVC:
cat <<EOF | kubectl apply -f -apiVersion: v1kind: PersistentVolumemetadata: name: pv-nas labels: pv: nfs-pvspec: capacity: storage: 100Gi storageClassName: nas accessModes: -ReadWriteMany -ReadOnlyMany persistentVolumeReclaimPolicy: Retain flexVolume: driver: "alicloud/nas" options: server: "1abb5492f7-ubq80.cn-beijing.nas.aliyuncs.com" path: "/k8s" vers: "3" options: "nolock,tcp,noresvport" --- apiVersion: v1kind: PersistentVolumeClaimmetadata: name: pvc-nasspec: accessModes: -ReadWriteMany storageClassName: nas resources: requests: storage: 100Gi selector: matchLabels: pv: nfs-pvEOF
Note:请将上面的挂载点(PV server)替换成你的。
Step 2: 创建SRS源站集群和Nginx源站应用和服务。
cat <<EOF | kubectl apply -f -apiVersion: v1kind: ConfigMapmetadata: name: srs-origin-configdata: srs.conf: |- listen 1935; max_connections 1000; daemon off; http_api { enabled on; listen 1985; } http_server { enabled on; listen 8080; } vhost __defaultVhost__ { cluster { origin_cluster on; coworkers srs-origin-0.socssrs-origin-1.socs srs-origin-2.socs; } http_remux { enabled on; } hls { enabled on; } } --- apiVersion: v1kind: Servicemetadata: name: socsspec: clusterIP: None selector: app: srs-origin ports: -name: socs-1935-1935 port: 1935 protocol: TCP targetPort: 1935 --- apiVersion: apps/v1kind: StatefulSetmetadata: name: srs-origin labels: app: srs-originspec: serviceName: "socs" replicas: 3 selector: matchLabels: app: srs-origin template: metadata: labels: app: srs-origin spec: volumes: - name: cache-volume persistentVolumeClaim: claimName: pvc-nas - name: config-volume configMap: name: srs-origin-config containers: - name: srs image: ossrs/srs:3 imagePullPolicy: IfNotPresent ports: - containerPort: 1935 - containerPort: 1985 - containerPort: 8080 volumeMounts: - name: cache-volume mountPath: /usr/local/srs/objs/nginx/html readOnly: false - name: config-volume mountPath: /usr/local/srs/conf --- apiVersion: apps/v1kind: Deploymentmetadata: name: nginx-origin-deploy labels: app: nginx-originspec: replicas: 1 selector: matchLabels: app: nginx-origin template: metadata: labels: app: nginx-origin spec: volumes: - name: cache-volume persistentVolumeClaim: claimName: pvc-nas containers: - name: nginx image: nginx imagePullPolicy: IfNotPresent ports: - containerPort: 80 volumeMounts: - name: cache-volume mountPath: /usr/share/nginx/html readOnly: true - name: srs-cp-files image: ossrs/srs:3 imagePullPolicy: IfNotPresent volumeMounts: - name: cache-volume mountPath: /tmp/html readOnly: false command: ["/bin/sh"] args: ["-c", "cp -R ./objs/nginx/html/* /tmp/html/; sleepinfinity"] --- apiVersion: v1kind: Servicemetadata: name: srs-http-servicespec: type: LoadBalancer selector: app: nginx-origin ports: -name: nginx-origin-service-80-80 port: 80 protocol: TCP targetPort: 80 --- apiVersion: v1kind: Servicemetadata: name: srs-api-servicespec: type: LoadBalancer selector: statefulset.kubernetes.io/pod-name: srs-origin-0 ports: -name: srs-api-service-1985-1985 port: 1985 protocol: TCP targetPort:1985EOF
Remark:假设SRS源站有状态服务srs-origin配置的Replicas为2,则会生成两个源站srs-origin-0.socs和srs-origin-1.socs,若新增了源站比如Replicas为3,则需要在配置中加上srs-origin-2.socs。
Remark:我们启动了一个srs-cp-files的container,拷贝SRS默认的文件,参考#1603.
Note:Origin Server在集群内部提供流媒体源站服务,内部域名为srs-origin-0.socs和srs-origin-1.socs,EdgeServer会通过该域名连接到OriginServer。
Note:Nginx通过SharedVolume(PV)读取SRSOrigin生成的切片,对外提供HLS服务。
Note:这里我们选择ACK自动创建SLB和EIP,也可以手动指定SLB,参考指定购买的SLB和EIP。
Step 3: 创建SRS边缘配置、应用和服务。
cat <<EOF | kubectl apply -f -apiVersion: v1kind: ConfigMapmetadata: name: srs-edge-configdata: srs.conf: |- listen 1935; max_connections 1000; daemon off; http_api { enabled on; listen 1985; } http_server { enabled on; listen 8080; } vhost __defaultVhost__ { cluster { mode remote; origin srs-origin-0.socssrs-origin-1.socs srs-origin2.socs; } http_remux { enabled on; } } --- apiVersion: apps/v1kind: Deploymentmetadata: name: srs-edge-deploy labels: app: srs-edgespec: replicas: 4 selector: matchLabels: app: srs-edge template: metadata: labels: app: srs-edge spec: volumes: - name: config-volume configMap: name: srs-edge-config containers: - name: srs image: ossrs/srs:3 imagePullPolicy: IfNotPresent ports: - containerPort: 1935 - containerPort: 1985 - containerPort: 8080 volumeMounts: - name: config-volume mountPath: /usr/local/srs/conf --- apiVersion: v1kind: Servicemetadata: name: srs-edge-servicespec: type: LoadBalancer selector: app: srs-edge ports: -name: srs-edge-service-1935-1935 port: 1935 protocol: TCP targetPort: 1935 -name: srs-edge-service-8080-8080 port: 8080 protocol: TCP targetPort: 8080EOF
Remark:假设SRS源站有状态服务srs-origin配置的Replicas为2,则会生成两个源站srs-origin-0.socs和srs-origin-1.socs,若新增了源站比如Replicas为3,则需要在配置中加上srs-origin-2.socs。
Note:Edge Server的配置中,通过源站在HeadlessService注册的内部域名srs-origin-0.socs等等,连接到OriginServer。
Note:这里我们选择ACK自动创建SLB和EIP,也可以手动指定SLB,参考指定购买的SLB和EIP。
Step 4: 大功告成。你可以推拉流了,其中HLS流可以从Nginx(80)播放,RTMP和HTTP-FLV从SRS播放:
Note:请将上面的EIP换成你自己的,可用命令kubectlget svc/srs-http-service或kubectl get svc/srs-edge-service查看你的EIP。
Note:如果是自动创建SLB和EIP,那么HLS和RTMP/HTTP-FLV的IP是不一样的,你可以选择手动指定SLB,这两个服务可以用同一个SLB,参考指定购买的SLB和EIP。
这里我们选择的是有状态集群方式,也可以选择以无状态应用(Deployment)方式部署源站,区别在于每个源站都需要创建一个Deployment和Service,参考源站集群部署方式,例如:
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原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。