-- 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.