Cassandra 说监听 9042 端口但无法连接

Question

我的本地机器上有运行 cassandra。

我已经开始了 sudo service cassandra start。然后检查 var/log/cassandra/system-log 下的日志，上面写着：

INFO  [main] 2019-07-28 13:13:17,226 Server.java:162 - Starting listening for CQL clients on localhost/127.0.0.1:9042 (unencrypted)...
INFO  [main] 2019-07-28 13:13:17,270 CassandraDaemon.java:501 - Not starting RPC server as requested. Use JMX (StorageService->startRPCServer()) or nodetool (enablethrift) to start it
INFO  [SharedPool-Worker-1] 2019-07-28 13:13:27,133 ApproximateTime.java:44 - Scheduling approximate time-check task with a precision of 10 milliseconds
INFO  [OptionalTasks:1] 2019-07-28 13:13:27,298 CassandraRoleManager.java:339 - Created default superuser role 'cassandra'

然后我尝试在终端中连接 cqlsh，它说： Connection error: ('Unable to connect to any servers', {'127.0.0.1:9042': error(111, "Tried connecting to [('127.0.0.1', 9042)]. Last error: Connection refused")})

怎么了？我也无法使用 netstat -tulpn 命令看到 9042 端口。

Answer 1

转到/etc/cassandra/cassandra-env.sh

取消注释

# JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname=<public name>"

并将其更改为

JVM_OPTS="$JVM_OPTS -Djava.rmi.server.hostname==localhost"

将 listen_address 和 broadcast_rpc_address 设置为本地 ip（从 ifconfig 获取 ip 地址）。
重新启动 Cassandra。

Answer 2

cqlsh localhost 9042

如果您不更改 cassandra.yml 文件，这将有效。

Cassandra 说监听 9042 端口但无法连接

Cassandra Says Listening on Port 9042 But Couldn't Connect It

cassandra

cqlsh