Jerrylou's Notes

NoSQL数据库Cassandra运维工具nodetool连接远程节点

cassandra集群安装成功后使用nodetool命令连接本机节点正常,连接其他节点报错:connectexception 'connection refused (connection refused)',查看nodetool连接的7199端口,监听0.0.0.0
那为什么会连接不上呢?原因在于:cassandra启动是有两种模式,local和remote模式。可以在conf/cassandra-env.sh中查看和修改。

配置

cassandra默认使用local模式,配置如下:

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if [ "x$LOCAL_JMX" = "x" ]; then
LOCAL_JMX=yes
fi
# Specifies the default port over which Cassandra will be available for
# JMX connections.
# For security reasons, you should not expose this port to the internet. Firewall it if needed.
JMX_PORT="7199"
if [ "$LOCAL_JMX" = "yes" ]; then
JVM_OPTS="$JVM_OPTS -Dcassandra.jmx.local.port=$JMX_PORT"
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=false"
else
JVM_OPTS="$JVM_OPTS -Dcassandra.jmx.remote.port=$JMX_PORT"
# if ssl is enabled the same port cannot be used for both jmx and rmi so either
# pick another value for this property or comment out to use a random port (though see CASSANDRA-7087 for origins)
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.rmi.port=$JMX_PORT"
# turn on JMX authentication. See below for further options
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=true"
# jmx ssl options
#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl=true"
#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.need.client.auth=true"
#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.enabled.protocols=<enabled-protocols>"
#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.enabled.cipher.suites=<enabled-cipher-suites>"
#JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.keyStore=/path/to/keystore"
#JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.keyStorePassword=<keystore-password>"
#JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.trustStore=/path/to/truststore"
#JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.trustStorePassword=<truststore-password>"
fi

如果想使用remote模式,添加LOCAL_JMX=false和修改-Dcom.sun.management.jmxremote.authenticate=false,当然你可以开启加密方式。配置如下:

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LOCAL_JMX=false
if [ "x$LOCAL_JMX" = "x" ]; then
LOCAL_JMX=yes
fi
# Specifies the default port over which Cassandra will be available for
# JMX connections.
# For security reasons, you should not expose this port to the internet. Firewall it if needed.
JMX_PORT="7199"
if [ "$LOCAL_JMX" = "yes" ]; then
JVM_OPTS="$JVM_OPTS -Dcassandra.jmx.local.port=$JMX_PORT"
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=false"
else
JVM_OPTS="$JVM_OPTS -Dcassandra.jmx.remote.port=$JMX_PORT"
# if ssl is enabled the same port cannot be used for both jmx and rmi so either
# pick another value for this property or comment out to use a random port (though see CASSANDRA-7087 for origins)
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.rmi.port=$JMX_PORT"
# turn on JMX authentication. See below for further options
JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.authenticate=false"
# jmx ssl options
#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl=true"
#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.need.client.auth=true"
#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.enabled.protocols=<enabled-protocols>"
#JVM_OPTS="$JVM_OPTS -Dcom.sun.management.jmxremote.ssl.enabled.cipher.suites=<enabled-cipher-suites>"
#JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.keyStore=/path/to/keystore"
#JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.keyStorePassword=<keystore-password>"
#JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.trustStore=/path/to/truststore"
#JVM_OPTS="$JVM_OPTS -Djavax.net.ssl.trustStorePassword=<truststore-password>"
fi

修改配置后,重启节点。一切ok