root@4c9f329b2677:/home/dong/janus-src/janus-gateway# /opt/janus/bin/janus -configs-folder=/opt/janus/etc/janus
Janus commit: 5aab9f03f57060eb6ba29150f132f248a4f24e0a
Compiled on:  Fri Dec  6 17:07:07 CST 2019

Logger plugins folder: /opt/janus/lib/janus/loggers

//加载日志模块失败，因为没有这个目录，探讨如何构建这个日志模块插件
[FATAL] [janus.c:main:3882]  Couldn't access logger plugins folder...
---------------------------------------------------
  Starting Meetecho Janus (WebRTC Server) v0.8.0
---------------------------------------------------

Checking command line arguments...
Debug/log level is 4
Debug/log timestamps are disabled
Debug/log colors are enabled
Adding 'vmnet' to the ICE ignore list...
Using 172.18.0.13 as local IP...
[WARN] Token based authentication disabled
Initializing recorder code
Initializing ICE stuff (Full mode, ICE-TCP candidates disabled, half-trickle, IPv6 support disabled)
TURN REST API backend: (disabled)

//目前是在一个虚拟机中搭建的环境，真实访问的IP地址是192.168.12.206
[WARN] Janus is deployed on a private address (172.18.0.13) but you didn't specify any STUN server! Expect trouble if this is supposed to work over the internet and not just in a LAN...
Crypto: OpenSSL pre-1.1.0
[WARN] The libsrtp installation does not support AES-GCM profiles
[FATAL] [dtls.c:janus_dtls_srtp_init:388] DTLS certificate and key must be specified

问题1：是否启动成功