box set up but oracle server is not working online

[ozeta]

i finished the installation and ssh'd into the system, but i cannot open the db at address localhost:1521/XE. the address is un-reachable. is there something else to configure?

sudo service oracle-xe status says:

vagrant@oracle:~$ sudo service oracle-xe status

LSNRCTL for Linux: Version 11.2.0.2.0 - Production on 21-NOV-2014 08:43:18

Copyright (c) 1991, 2011, Oracle. All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))

STATUS of the LISTENER

Alias LISTENER
Version TNSLSNR for Linux: Version 11.2.0.2.0 - Production
Start Date 21-NOV-2014 07:59:31
Uptime 0 days 0 hr. 43 min. 46 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File /u01/app/oracle/product/11.2.0/xe/network/admin/listener.ora
Listener Log File /u01/app/oracle/diag/tnslsnr/oracle/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC_FOR_XE)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "XE" has 1 instance(s).
Instance "XE", status READY, has 1 handler(s) for this service...
Service "XEXDB" has 1 instance(s).
Instance "XE", status READY, has 1 handler(s) for this service...
The command completed successfully

[msteinhoff]

vagrant@oracle:~$ cat /u01/app/oracle/product/11.2.0/xe/network/admin/tnsnames.ora
# tnsnames.ora Network Configuration File:

XE =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = oracle)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = XE)
    )
  )

[...]

and

vagrant@oracle:~$ cat /etc/hosts
127.0.0.1   localhost
127.0.1.1 oracle oracle

So when logged in via vagrant, you have to use the following:

$ sqlplus system/manager@//oracle:1521/XE

If you are using JDBC on the host system, this URL also works for me: jdbc:oracle:thin:@localhost:1521/XE.

For sqlplus on the host system, you must configure tnslistener.ora with localhost:1521.