TNS-01106: Listener using listener name LISTENER has already been started

-- 启动监听,提示已经启动.

[oracle@sh ~]$ lsnrctl start
LSNRCTL for Linux: Version 12.1.0.2.0 - Production on 06-FEB-2017 15:30:14
Copyright (c) 1991, 2014, Oracle.  All rights reserved.

TNS-01106: Listener using listener name LISTENER has already been started

-- 通过ps 命令没有发现 监听的进程

[root@sh ~]# ps -ef | grep -i tns
root        36     2  0 Jan26 ?        00:00:00 [netns]
root     14995 14824  0 15:30 pts/1    00:00:00 grep -i tns

-- 这个问题基本2个原因导致, ：

1,  /etc/hosts 文件中的 ip和主机名不一致

2, listener.ora 中监听主机非当前主机.