[英]Connecting to AWS Managed Cassandra Service from Lagom
我在从 Lagom 环境连接到 AWS Managed Cassandra Service 时遇到问题。 这是我尝试过的,结果如何。
(1) Amazon 提供了从 Java 代码连接到 AWS MCS 的说明:
https://docs.aws.amazon.com/fr_fr/mcs/latest/devguide/cqlsh.html#using_java_driver
说明的要点是您需要安装证书,然后将其传递给 JVM,如下所示:
-Djavax.net.ssl.trustStore=path_to_file/cassandra_truststore.jks
-Djavax.net.ssl.trustStorePassword=amazon
然后,您可以使用您选择的任何 Cassandra Java 驱动程序。 我选择的是 Lagom 框架提供的 DataStax 驱动程序。
我通过将以下内容添加到build.sbt
来build.sbt
:
javaOptions ++= Seq(
"-Djavax.net.ssl.trustStore=project/cassandra_truststore.jks",
"-Djavax.net.ssl.trustStorePassword=amazon"
)
// Must enable JVM forking to use javaOptions with runAll.
fork := true
(2) 在将我的 Lagom 应用程序部署到 AWS 之前,我想在开发模式下使用它,但将它连接到 AWS MCS 而不是嵌入式 Cassandra 服务器。 Lagom 提供了在开发模式下执行此操作的说明:
说明的要点是将以下几行添加到build.sbt
:
lagomCassandraEnabled in ThisBuild := false
lagomUnmanagedServices in ThisBuild := Map("cas_native" -> "tcp://localhost:9042")
此示例中的 URI 假定 Cassandra 服务器在localhost:9042
上运行。 就我而言,我将其替换为cassandra.us-east-1.amazonaws.com:9142
。
(3) 尽管如此,当我运行sbt runAll
,我在尝试访问 AWS MCS 时出现超时:
Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: cassandra.us-east-1.amazonaws.com/3.83.168.143:9142 (com.datastax.driver.core.exceptions.OperationTimedOutException: [cassandra.us-east-1.amazonaws.com/3.83.168.143:9142] Operation timed out))
(4) 我通过完全绕过 Lagom 并只编写了一段非常简单的代码来隔离问题,如下所示:
System.setProperty("javax.net.ssl.trustStore", "redacted_absolute_file_path/cassandra_truststore.jks")
System.setProperty("javax.net.ssl.trustStorePassword", "amazon")
val cluster = Cluster.builder.addContactPoint("cassandra.us-east-1.amazonaws.com").withPort(9142).build()
val session = cluster.connect()
session.close()
cluster.close()
这很简单。 但发生同样的超时。 我究竟做错了什么?
通过查看 AWS MCS Python 文档找到了一个解决方案(Java 文档对此事明显保持沉默)。 结果我确实需要配置 MCS 服务特定的凭据,然后在 Lagom 的application.conf
文件中提供它们,如下所示:
cassandra.default {
port = 9142
ssl.truststore {
path = "path/cassandra_truststore.jks"
password = "amazon"
}
authentication {
username = "service-specific username"
password = "service-specific password"
}
}
cassandra-journal {
port = ${cassandra.default.port}
ssl.truststore {
path = ${cassandra.default.ssl.truststore.path}
password = ${cassandra.default.ssl.truststore.password}
}
authentication {
username = ${cassandra.default.authentication.username}
password = ${cassandra.default.authentication.password}
}
}
cassandra-snapshot-store {
port = ${cassandra.default.port}
ssl.truststore {
path = ${cassandra.default.ssl.truststore.path}
password = ${cassandra.default.ssl.truststore.password}
}
authentication {
username = ${cassandra.default.authentication.username}
password = ${cassandra.default.authentication.password}
}
}
lagom.persistence.read-side.cassandra {
port = ${cassandra.default.port}
ssl.truststore {
path = ${cassandra.default.ssl.truststore.path}
password = ${cassandra.default.ssl.truststore.password}
}
authentication {
username = ${cassandra.default.authentication.username}
password = ${cassandra.default.authentication.password}
}
}
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