[docker-ptf]: Update entrypoint entry for docker-ptf (#836)

* Updated entrypoint for docker-ptf container

* Add main supervisord.conf file under /etc/supervisor. Run supervisord with option -c

dockers/docker-ptf/Dockerfile.j2

@@ -96,8 +96,11 @@ RUN mkdir /var/run/sshd \
  && sed -ri 's/UsePAM yes/#UsePAM yes/g' /etc/ssh/sshd_config \
  && sed -i '$aUseDNS no' /etc/ssh/sshd_config
 
-COPY ["supervisord.conf", "sshd.conf", "ptf_nn_agent.conf", "/etc/supervisor/conf.d/"]
+COPY ["supervisord.conf", "/etc/supervisor/"]
+COPY ["conf.d/supervisord.conf", "conf.d/sshd.conf", "conf.d/ptf_nn_agent.conf", "/etc/supervisor/conf.d/"]
+
+RUN mkdir -p /var/log/supervisor
 
 EXPOSE 22
 
-ENTRYPOINT ["/usr/bin/supervisord"]
+ENTRYPOINT ["/usr/local/bin/supervisord", "-c", "/etc/supervisor/supervisord.conf"]

dockers/docker-ptf/conf.d/supervisord.conf

@@ -0,0 +1,2 @@
+[supervisord]
+nodaemon=true

dockers/docker-ptf/supervisord.conf

@@ -1,2 +1,28 @@
+; supervisor config file
+
+[unix_http_server]
+file=/var/run/supervisor.sock    ; (the path to the socket file)
+chmod=0700                       ; sockef file mode (default 0700)
+
 [supervisord]
-nodaemon=true
+logfile=/var/log/supervisor/supervisord.log ; (main log file;default $CWD/supervisord.log)
+pidfile=/var/run/supervisord.pid            ; (supervisord pidfile;default supervisord.pid)
+childlogdir=/var/log/supervisor             ; ('AUTO' child log dir, default $TEMP)
+
+; the below section must remain in the config file for RPC
+; (supervisorctl/web interface) to work, additional interfaces may be
+; added by defining them in separate rpcinterface: sections
+[rpcinterface:supervisor]
+supervisor.rpcinterface_factory = supervisor.rpcinterface:make_main_rpcinterface
+
+[supervisorctl]
+serverurl=unix:///var/run/supervisor.sock ; use a unix:// URL  for a unix socket
+
+; The [include] section can just contain the "files" setting.  This
+; setting can list multiple files (separated by whitespace or
+; newlines).  It can also contain wildcards.  The filenames are
+; interpreted as relative to this file.  Included files *cannot*
+; include files themselves.
+
+[include]
+files = /etc/supervisor/conf.d/*.conf