CentOS ,启动监听总是报错：
TNS-12547: TNS:lost contact
TNS-12560: TNS:protocol adapter error
TNS-00517: Lost contact
Linux Error: 32: Broken pipe
No longer listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))
No longer listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=172.17.21.117)(PORT=1521)))
经检查listener.ora与tnsnames.ora中IP地址都填的是主机名，其中listener.ora主机名未变，修改完成无需重启机器，直接生效
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