现象： 执行 lsnrctl start 来启动 listener,却失败了。
$ lsnrctl stat LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 09-APR-2021 23:45:02 Copyright (c) 1991, 2019, Oracle. All rights reserved. Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=hst15574.mytst.com)(PORT=1521))) TNS-12541: TNS:no listener TNS-12560: TNS:protocol adapter error TNS-00511: No listener Linux Error: 111: Connection refused Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521))) TNS-12541: TNS:no listener TNS-12560: TNS:protocol adapter error TNS-00511: No listener Linux Error: 2: No such file or directory $
$ lsnrctl start LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 09-APR-2021 23:45:08 Copyright (c) 1991, 2019, Oracle. All rights reserved. Starting /refresh/home/app/oracle/product/19.3.0/bin/tnslsnr: please wait... TNSLSNR for Linux: Version 19.0.0.0.0 - Production System parameter file is /refresh/home/app/oracle/product/19.9.0/network/admin/listener.ora Log messages written to /refresh/home/app/oracle/diag/tnslsnr/hst06027/listener/alert/log.xml Error listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=hst15574.mytst.com)(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: 99: Cannot assign requested address Listener failed to start. See the error message(s) above...
检查 host 文件，没有发现有什么问题。
$ $ cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 $
再看 listener.ora 文件：
[oracle@hst06027 admin]$ cat /refresh/home/app/oracle/product/19.9.0/network/admin/listener.ora
# listener.ora Network Configuration File: /refresh/home/app/oracle/product/19.9.0/network/admin
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = hst15574.mytst.com)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
再看hostname 的结果：
[oracle@hst06027 admin]$ cat /refresh/home/app/oracle/product/19.9.0/network/admin/listener.ora
# listener.ora Network Configuration File: /refresh/home/app/oracle/product/19.9.0/network/admin
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = hst15574.mytst.com)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
由于曾经改变了主机名，所以，listener.ora 中的主机名和 hostname 中的名字不同，导致无法运行listener。需要编辑修改 listener.ora ：
$ vi /refresh/home/app/oracle/product/19.9.0/network/admin/listener.ora
确认：
$ cat /refresh/home/app/oracle/product/19.9.0/network/admin/listener.ora
# listener.ora Network Configuration File: /refresh/home/app/oracle/product/19.9.0/network/admin
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = hst06027.mytst.com)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
)
)
再次启动，发现可以成功了。
[oracle@hst06027 admin]$ lsnrctl start LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 09-APR-2021 23:49:25 Copyright (c) 1991, 2019, Oracle. All rights reserved. Starting /refresh/home/app/oracle/product/19.3.0/bin/tnslsnr: please wait... TNSLSNR for Linux: Version 19.0.0.0.0 - Production System parameter file is /refresh/home/app/oracle/product/19.9.0/network/admin/listener.ora Log messages written to /refresh/home/app/oracle/diag/tnslsnr/hst06027/listener/alert/log.xml Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=hst06027.mytst.com)(PORT=1521))) Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521))) Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=hst06027.mytst.com)(PORT=1521))) STATUS of the LISTENER ------------------------ Alias LISTENER Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production Start Date 09-APR-2021 23:49:26 Uptime 0 days 0 hr. 0 min. 0 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File /refresh/home/app/oracle/product/19.9.0/network/admin/listener.ora Listener Log File /refresh/home/app/oracle/diag/tnslsnr/hst06027/listener/alert/log.xml Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=hst06027.mytst.com)(PORT=1521))) (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521))) The listener supports no services The command completed successfully
等待两三分钟，确认 listener 的状态：
[oracle@hst06027 admin]$ lsnrctl stat LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 09-APR-2021 23:51:26 Copyright (c) 1991, 2019, Oracle. All rights reserved. Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=hst06027.mytst.com)(PORT=1521))) STATUS of the LISTENER ------------------------ Alias LISTENER Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production Start Date 09-APR-2021 23:49:26 Uptime 0 days 0 hr. 2 min. 0 sec Trace Level off Security ON: Local OS Authentication SNMP OFF Listener Parameter File /refresh/home/app/oracle/product/19.9.0/network/admin/listener.ora Listener Log File /refresh/home/app/oracle/diag/tnslsnr/hst06027/listener/alert/log.xml Listening Endpoints Summary... (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=hst06027.mytst.com)(PORT=1521))) (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521))) Services Summary... Service "86b637b62fdf7a65e053f706e80a27ca" has 1 instance(s). Instance "db193cdb", status READY, has 1 handler(s) for this service... Service "appcon1" has 1 instance(s). Instance "db193cdb", status READY, has 1 handler(s) for this service... Service "apppdb1" has 1 instance(s). Instance "db193cdb", status READY, has 1 handler(s) for this service... Service "apppdb2" has 1 instance(s). Instance "db193cdb", status READY, has 1 handler(s) for this service...