[docker-sflow]: use service dependency in supervisord to start services

dockers/docker-sflow/Dockerfile.j2

@@ -27,7 +27,6 @@ RUN apt-get clean -y      && \
 
 RUN sed -ri '/^DAEMON_ARGS=""/c DAEMON_ARGS="-c /var/log/hsflowd.crash"' /etc/init.d/hsflowd
 
-COPY ["start.sh", "/usr/bin/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 COPY ["files/supervisor-proc-exit-listener", "/usr/bin"]
 COPY ["critical_processes", "/etc/supervisor"]

dockers/docker-sflow/start.sh

@@ -1,7 +0,0 @@
-#!/usr/bin/env bash
-
-rm -f /var/run/rsyslogd.pid
-
-supervisorctl start rsyslogd
-
-supervisorctl start sflowmgrd

dockers/docker-sflow/supervisord.conf

@@ -3,32 +3,35 @@ logfile_maxbytes=1MB
 logfile_backups=2
 nodaemon=true
 
+[eventlistener:dependent-startup]
+command=python -m supervisord_dependent_startup
+autostart=true
+autorestart=unexpected
+startretries=0
+exitcodes=0,3
+events=PROCESS_STATE
+
 [eventlistener:supervisor-proc-exit-listener]
 command=/usr/bin/supervisor-proc-exit-listener --container-name sflow
 events=PROCESS_STATE_EXITED
 autostart=true
 autorestart=unexpected
 
-[program:start.sh]
-command=/usr/bin/start.sh
+[program:rsyslogd]
+command=/usr/sbin/rsyslogd -n -iNONE
 priority=1
-autostart=true
+autostart=false
 autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
+dependent_startup=true
 
-[program:rsyslogd]
-command=/usr/sbin/rsyslogd -n
+[program:sflowmgrd]
+command=/usr/bin/sflowmgrd
 priority=2
 autostart=false
 autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
-
-[program:sflowmgrd]
-command=/usr/bin/sflowmgrd
-priority=3
-autostart=false
-autorestart=false
-stdout_logfile=syslog
-stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=rsyslogd:running