我想添加Cassandra监测使用普罗米修斯。裁判https://blog.pythian.com/step-step-monitoring-cassandra-prometheus-grafana/
当我添加/etc/cassandra/cassandra-env.sh JVM_OPTS="$JVM_OPTS -javaagent:/opt/jmx_prometheus/jmx_prometheus_javaagent-0.3.0.jar=7070:/opt/jmx_prometheus/cassandra.yml" 我得到一个错误：

ubuntu@ip-172-21-0-111:~$ sudo service cassandra status
● cassandra.service - LSB: distributed storage system for structured data
   Loaded: loaded (/etc/init.d/cassandra; bad; vendor preset: enabled)
   Active: active (exited) since Mon 2020-04-13 05:43:38 UTC; 3s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 3557 ExecStop=/etc/init.d/cassandra stop (code=exited, status=0/SUCCESS)
  Process: 3570 ExecStart=/etc/init.d/cassandra start (code=exited, status=0/SUCCESS)

Apr 13 05:43:38 ip-172-21-0-111 systemd[1]: Starting LSB: distributed storage system for structured data...
Apr 13 05:43:38 ip-172-21-0-111 systemd[1]: Started LSB: distributed storage system for structured data.
ubuntu@ip-172-21-0-111:~$ nodetool status
nodetool: Failed to connect to '127.0.0.1:7199' - ConnectException: 'Connection refused (Connection refused)'.

当我删除jmx\u prometheus条目时，我让它工作：

ubuntu@ip-172-21-0-111:~$ nodetool status
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address       Load       Tokens       Owns (effective)  Host ID                               Rack
UN  172.21.0.111  1.83 GiB   128          100.0%            b52324d0-c57f-46e3-bc10-a6dc07bae17a  rack1

ubuntu@ip-172-21-0-111用法：~$tail-f/var/log/cassandra/system.log

INFO  [main] 2020-04-13 05:37:36,609 StorageService.java:2169 - Node /172.21.0.111 state jump to NORMAL
INFO  [main] 2020-04-13 05:37:36,617 CassandraDaemon.java:673 - Waiting for gossip to settle before accepting client requests...
INFO  [main] 2020-04-13 05:37:44,621 CassandraDaemon.java:704 - No gossip backlog; proceeding
INFO  [main] 2020-04-13 05:37:44,713 NativeTransportService.java:70 - Netty using native Epoll event loop
INFO  [main] 2020-04-13 05:37:44,773 Server.java:161 - Using Netty Version: [netty-buffer=netty-buffer-4.0.36.Final.e8fa848, netty-codec=netty-codec-4.0.36.Final.e8fa848, netty-codec-haproxy=netty-codec-haproxy-4.0.36.Final.e8fa848, netty-codec-http=netty-codec-http-4.0.36.Final.e8fa848, netty-codec-socks=netty-codec-socks-4.0.36.Final.e8fa848, netty-common=netty-common-4.0.36.Final.e8fa848, netty-handler=netty-handler-4.0.36.Final.e8fa848, netty-tcnative=netty-tcnative-1.1.33.Fork15.906a8ca, netty-transport=netty-transport-4.0.36.Final.e8fa848, netty-transport-native-epoll=netty-transport-native-epoll-4.0.36.Final.e8fa848, netty-transport-rxtx=netty-transport-rxtx-4.0.36.Final.e8fa848, netty-transport-sctp=netty-transport-sctp-4.0.36.Final.e8fa848, netty-transport-udt=netty-transport-udt-4.0.36.Final.e8fa848]
INFO  [main] 2020-04-13 05:37:44,773 Server.java:162 - Starting listening for CQL clients on /172.21.0.111:9042 (unencrypted)...
INFO  [main] 2020-04-13 05:37:44,811 CassandraDaemon.java:505 - Not starting RPC server as requested. Use JMX (StorageService->startRPCServer()) or nodetool (enablethrift) to start it
INFO  [SharedPool-Worker-1] 2020-04-13 05:37:46,625 ApproximateTime.java:44 - Scheduling approximate time-check task with a precision of 10 milliseconds
INFO  [OptionalTasks:1] 2020-04-13 05:37:46,752 CassandraRoleManager.java:339 - Created default superuser role 'cassandra'