为什么NIFI不能用REGISTRY启动版本控制？答案

【问题标题】：Why can not NIFI start version control with REGISTRY?为什么NIFI不能用REGISTRY启动版本控制？
【发布时间】：2020-05-27 19:42:24
【问题描述】：

NIFI-1.10.0 和 REGISTRY-0.5.0 是使用 DOCKER 安装的。当处理器组使用主机名上传 NIFI-Registry 时，出现如下错误，

WARN [NiFi Web Server-100] o.a.n.w.a.config.NiFiCoreExceptionMapper org.apache.nifi.web.NiFiCoreException: Unable to obtain listing of buckets: java.net.ConnectException: Connection refused (Connection refused). Returning Conflict response.
org.apache.nifi.web.NiFiCoreException: Unable to obtain listing of buckets: java.net.ConnectException: Connection refused (Connection refused) 
Caused by: java.net.ConnectException: Connection refused (Connection refused)
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:607)
    at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:666)
    at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
    at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:264)
    at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:367)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1162)
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1056)
    at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1570)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
    at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:352)
    at org.glassfish.jersey.client.internal.HttpUrlConnector._apply(HttpUrlConnector.java:390)
    at org.glassfish.jersey.client.internal.HttpUrlConnector.apply(HttpUrlConnector.java:282)
    at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:278)

【问题讨论】：

标签： apache-nifi apache-nifi-registry

【解决方案1】：

您是否在安全集群中（通过 https 访问）？如果是这样，您需要授予对节点的访问权限，就像这样（在注册表中）：

如果您不在安全集群中，请尝试设置这样的地址：http://hostname:port。不添加 /nifi-registry

另一种查看方式，在 docker 内，确保您的主机可以相互通信（更容易在同一个 docker 网络上，并尝试互相 ping）

【讨论】：

谢谢。他们可以相互通信，并且Nifi安装在使用安全模式的单机中。
顺便说一句，Nifi 和 Registry 使用相同的密钥库和信任库路径