[GitHub] [skywalking] makingtime opened a new issue #3159: about OAP cluster setup

[GitBox <gi...@apache.org>]

makingtime opened a new issue #3159: about OAP cluster setup 
URL: https://github.com/apache/skywalking/issues/3159
 
 
   
   
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   Hi, I'm working on deploy an OAP cluster with zookeeper as coordinator,  I have read some official documents, and found the changes need to do are: 
   
   #### Backend part
   
   1. OAP Server instances
   
      base on [backend-cluster.md](https://github.com/apache/skywalking/blob/master/docs/en/setup/backend/backend-cluster.md), change `cluster` segment of `application.yml` in each OAP Server instance, add zookeeper nodes info, mainly ip and port.
   
      eg. 
   
      ```
      cluster:
        zookeeper:
          nameSpace: ${SW_NAMESPACE:""}
          hostPort: ${SW_CLUSTER_ZK_HOST_PORT:zk_host1:2181,zk_host2:2181,zk_host3:2181}
          # Retry Policy
          baseSleepTimeMs: 1000 # initial amount of time to wait between retries
          maxRetries: 3 # max number of times to retry
      ```
   
      
   
   2. UI
   
      base on [ui-setup.md](https://github.com/apache/skywalking/blob/master/docs/en/setup/backend/ui-setup.md),  change `webapp/webapp.yml`, add all OAP Server instaces' IP:PORT to `collector.ribbon.listOfServers`
   
      eg.
   
      ```
      collector:
        path: /graphql
        ribbon:
          ReadTimeout: 10000
          # Point to all backend's restHost:restPort, split by , 
          listOfServers: OAP_SERVER1:12800,OAP_SERVER2:12800
      ```
   
      
   
   #### Agent part
   
   base on [java-agent/README.md](https://github.com/apache/skywalking/blob/master/docs/en/setup/service-agent/java-agent/README.md), change `collector.backend_service`, add all OAP Server instaces' IP:PORT to `agent/config/agent.config`
   
   eg.
   
   ```
   collector.backend_service=${SW_AGENT_COLLECTOR_BACKEND_SERVICES:OAP_SERVER1:11800,OAP_SERVER2:11800}
   ```
   
   #### Questions
   
   I'm new to Skywalking, and I'm not quite understand how skywalking OAP cluster works, would appreciate some help to below questions:
   
   1. could you help confirm if there are anything that I miss? do I need to setup a load balancer for OAP Servers?
   2. if we config multiple OAP servers in `agent.config`, when a java agent sends out data, which OAP server will it be sent to?  or do we need to setup a load balance server, and use it for `collector.backend_service` in `agent.config`?
   3. when we config multiple OAP servers in RocketbotUI's `webapp/webapp.yml`, how does RocketbotUI decide which OAP server to send graphQL request to?
   
    A little suggestion: I think it will be best if we have a complete guide for OAP cluster setup (maybe include UI and agent setup links).
   
   Thanks!

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