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# at the beginning, log in to the root user directly. In the etc directory, change to oracle, and enter lsnrctl start to prompt "lsnrctl: command not found" [root@loveyao_test etc] # su oracle @ loveyao_test etc] $lsnrctl startbash: lsnrctl: command not found# to switch back to the root user, cd / root directory, su-oracle again, and type lsnrctl start to start oracle. This time it's normal. [oracle@loveyao_test ~] $cd / [oracle@loveyao_test /] $su-rootsu: invalid option-- 'r'Try `su-- help' for more information. [oracle @ loveyao_test /] $su-rootPassword: [root@loveyao_test ~] # su-oracle @ loveyao_test ~] $[oracle@loveyao_test ~] $lsnrctl startLSNRCTL for Linux: Version 11.2.0.3.0-Production on 04-JUL-2016 22:06:57Copyright (c) 1991, 2011, Oracle. All rights reserved.Starting / u01/app/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait...TNSLSNR for Linux: Version 11.2.0.3.0-ProductionLog messages written to / u01/app/oracle/diag/tnslsnr/loveyao_test/listener/alert/log.xmlError listening on: (ADDRESS= (PROTOCOL=tcp) (HOST=) (PORT=1521)) TNS-12545: Connect failed because target host or object does not exist TNS-12560: TNS:protocol adapter error TNS-00515: Connect failed because Target host or object does not exist Linux Error: 25: Inappropriate ioctl for deviceListener failed to start. See the error message (s) above. [oracle @ loveyao_test] $# as shown above: oracle failed to start, prompting "Error listening on: (ADDRESS= (PROTOCOL=tcp) (HOST=) (PORT=1521)) TNS-12545: Connect failed because target host or object does not exist" # hosts file, switch root to modify hosts file, restart oracle can start normally. The specific operations are as follows: [oracle@loveyao_test alert] $su-rootPassword: [root@loveyao_test ~] # [root@loveyao_test ~] # [root@loveyao_test ~] # vi / etc/hosts127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4::1 localhost localhost.localdomain localhost6 localhost6.localdomain6~# modify the hosts file localhost to the hostname hostname Note: vi / etc/sysconfig/network file can change the name of hostname (here you need to restart the system after modification). [root@loveyao_test ~] # vi / etc/hosts127.0.0.1 loveyao_test localhost.localdomain localhost4 localhost4.localdomain4::1 localhost localhost.localdomain localhost6 localhost6.localdomain6~ [root@loveyao_test ~] # su-Oracle [loveyao_test ~] $lsnrctl startLSNRCTL for Linux: Version 11.2.0.3.0-Production on 04 -JUL-2016 22:23:22Copyright (c) 1991 2011, Oracle. All rights reserved.Starting / u01/app/oracle/product/11.2.0/db_1/bin/tnslsnr: please wait...TNSLSNR for Linux: Version 11.2.0.3.0-ProductionLog messages written to / u01/app/oracle/diag/tnslsnr/loveyao_test/listener/alert/log.xmlListening on: (DESCRIPTION= (ADDRESS= (PROTOCOL=tcp) (HOST=loveyao_test) (PORT=1521)) Connecting to (ADDRESS= (PROTOCOL=tcp) (HOST=) (PORT=1521)) STATUS of the LISTENER- -Alias LISTENERVersion TNSLSNR for Linux: Version 11.2.0.3.0-ProductionStart Date 04-JUL-2016 22:23:22Uptime 0 days 0 hr. 0 min. 0 secTrace Level offSecurity ON: Local OS AuthenticationSNMP OFFListener Log File / u01/app/oracle/diag/tnslsnr/loveyao_test/listener/alert/log.xmlListening Endpoints Summary... (DESCRIPTION= (ADDRESS= (PROTOCOL=tcp) (HOST=loveyao_test) (PORT=1521) The listener supports no servicesThe command completed listening [oracle @ loveyao_test ~] $# View oracle listening port 1521 [oracle@loveyao_test ~] $ss-tanlRecv-Q Send-Q Local Address:Port Peer Address:Port 0128: 111: : * 0128 *: 1521: * 0128: 25493 : * 0 128: 22: * 0 128 *: 22 *: * 0 128 127.0.0.1 purl 631 *: * 0128:: 1Partition 631: * 0100:: 1:25: * 0100 127.0.0. 1:25 *: * 0128 *: 39108 *: * [oracle@loveyao_test ~] $

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