title: cassandra nodetool : Failed to connect to '127.0.0.1:7199'
body: <p>i installed cassandra 3.11.3-1 on centos7 &amp; vmware </p>
  
  <p>i didn't have error while installing cassandra. 
  i started cassandra and faced this logs. </p>
  
  <pre><code>[root@localhost ~]# service cassandra start
  Starting cassandra (via systemctl):                        [  OK  ]
  
  [root@localhost ~]# systemctl status cassandra
  cassandra.service - LSB: distributed storage system for structured data
  Loaded: loaded (/etc/rc.d/init.d/cassandra; bad; vendor preset: disabled)
  Active: deactivating (stop) (Result: exit-code) since 2018-08-02 15:15:45 
  KST; 6s ago
  Docs: man:systemd-sysv-generator(8)
  Process: 10366 ExecStart=/etc/rc.d/init.d/cassandra start (code=exited, 
  status=0/SUCCESS)
  Main PID: 10450 (code=exited, status=3);         : 10478 (cassandra)
  Tasks: 2
  CGroup: /system.slice/cassandra.service
           └─control
              ├─10478 /bin/bash /etc/rc.d/init.d/cassandra stop
              └─10549 sleep 0.5
  
   02 15:15:39 localhost.localdomain systemd[1]: Starting LSB: distributed 
   stora....
   02 15:15:39 localhost.localdomain su[10376]: (to cassandra) root on none
   02 15:15:41 localhost.localdomain cassandra[10366]: Starting Cassandra: OK
   02 15:15:41 localhost.localdomain systemd[1]: Started LSB: distributed 
   storag....
    02 15:15:45 localhost.localdomain systemd[1]: cassandra.service: main 
   process...D
   02 15:15:45 localhost.localdomain su[10489]: (to cassandra) root on none
   02 15:15:45 localhost.localdomain cassandra[10478]: Shutdown Cassandra: 
   bash: …
   Hint: Some lines were ellipsized, use -l to show in full.
  </code></pre>
  
  <p>it means 'cassandra starting is ok' right? 
  but when i check the node status like this 
      "nodetool status" </p>
  
  <p>then i met this logs. </p>
  
  <pre><code>    "] nodetool status" 
  nodetool: Failed to connect to '127.0.0.1:7199' - ConnectException: 
  Connection refused)
  </code></pre>
  
  <p>so i searched a lot on google. 
  i found some information. 
  so i tried this. </p>
  
  <ol>
  <li>edit cassandra-env.sh 
  "JVM_OPTS -Djava.rmi.server.hostname=127.0.0.1" </li>
  <li>expend memory size : 1GB -> 2GB </li>
  </ol>
  
  <p>but i still faced same error. </p>
  
  <p>someone help me please. </p>
  
  <p>------------- system.log ----------------------------------</p>
  
  <p>INFO  [main] 2018-08-02 15:15:44,866 YamlConfigurationLoader.java:89 - Configuration location: file:/etc/cassandra/default.conf/cassandra.yaml</p>
  
  <p>ERROR [main] 2018-08-02 15:15:45,043 CassandraDaemon.java:708 - Exception encountered during startup: Invalid yaml: file:/etc/cassandra/default.conf/cassandra.yaml
  Error: while scanning a simple key; could not found expected ':';  in 'reader', line 601, column 1:</p>
  
  <h1>Set listen_address OR listen_i ...</h1>