apollo单节点部署如何升级为集群模式
#3997
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apollo-client 始终是从配置的 meta server 地址获取 config service 地址，只要确保升级过程中 meta server 地址可以访问，并且能否返回正确的 config service 地址即可。 |
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新集群的apollo可以和老的单节点apollo共用同一个ApolloConfigDB和ApolloPortalDB么。如果可以的话，apollo-client中修改meta server 指向新的apollo集群的meta server。当所有的应用都切换到新apollo集群后，停掉老的apollo单节点。这样升级可行么 |
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数据库可以共用的，而且也应该共用~ |
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apollo单节点部署已经运行一段时间，如何升级为集群模式。可不可以先部署个apollo集群，后端数据库也使用单节点的apollo数据库。然后切换代码中的configService（域名:port）地址到apollo集群上
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