[docker-lldp-sv2]: use service dependency in supervisord to start services

dockers/docker-lldp-sv2/Dockerfile.j2

@@ -37,6 +37,7 @@ RUN apt-get purge -y python-pip && \
 
 COPY ["docker-lldp-init.sh", "/usr/bin/"]
 COPY ["start.sh", "/usr/bin/"]
+COPY ["waitfor_lldp_ready.sh", "/usr/bin/"]
 COPY ["supervisord.conf.j2", "/usr/share/sonic/templates/"]
 COPY ["lldpd.conf.j2", "/usr/share/sonic/templates/"]
 COPY ["lldpd", "/etc/default/"]

dockers/docker-lldp-sv2/start.sh

@@ -5,34 +5,4 @@ sonic-cfggen -d -t /usr/share/sonic/templates/lldpd.conf.j2 > /etc/lldpd.conf
 mkdir -p /var/sonic
 echo "# Config files managed by sonic-config-engine" > /var/sonic/config_status
 
-rm -f /var/run/rsyslogd.pid
 rm -f /var/run/lldpd.socket
-
-supervisorctl start rsyslogd
-supervisorctl start lldpd
-
-# Current lldpd version has a bug.
-# When lldpd starts it is in the pause state by default
-# But then it execute 'lldpcli resume' to configure and unpause itself.
-# When lldpd execute lldpcli, it doesn't check the return code
-# Sometimes lldpcli returns failure, but lldpd doesn't catch it
-# and keeps working paused and unconfigured
-#
-# The fix below addresses the issue.
-#
-
-# wait until lldpd started
-until [[ -e /var/run/lldpd.socket ]];
-do
-    sleep 1;
-done
-
-# Manually try to resume lldpd, until it's successful
-while /bin/true;
-do
-    lldpcli -u /var/run/lldpd.socket -c /etc/lldpd.conf -c /etc/lldpd.d resume > /dev/null && break
-    sleep 1
-done
-
-supervisorctl start lldp-syncd
-supervisorctl start lldpmgrd

dockers/docker-lldp-sv2/supervisord.conf.j2

@@ -3,27 +3,39 @@ 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 lldp
 events=PROCESS_STATE_EXITED
 autostart=true
 autorestart=unexpected
 
-[program:start.sh]
-command=/usr/bin/start.sh
-priority=1
-autostart=true
-autorestart=false
-stdout_logfile=syslog
-stderr_logfile=syslog
-
 [program:rsyslogd]
-command=/usr/sbin/rsyslogd -n
+command=/usr/sbin/rsyslogd -n -iNONE
-priority=2
+priority=1
 autostart=false
 autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
+dependent_startup=true
+
+[program:start]
+command=/usr/bin/start.sh
+priority=2
+autostart=false
+autorestart=false
+startsecs=0
+stdout_logfile=syslog
+stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=rsyslogd:running
 
 [program:lldpd]
 # https://github.com/vincentbernat/lldpd/commit/9856f2792c301116cc4a3fcfba91b9672ee5db1f
@@ -41,6 +53,19 @@ autostart=false
 autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=start:exited
+
+[program:waitfor_lldp_ready]
+command=/usr/bin/waitfor_lldp_ready.sh
+priority=3
+autostart=false
+autorestart=false
+startsecs=0
+stdout_logfile=syslog
+stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=lldpd:running
 
 [program:lldp-syncd]
 command=/usr/bin/env python2 -m lldp_syncd
@@ -49,6 +74,8 @@ autostart=false
 autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=waitfor_lldp_ready:exited
 
 [program:lldpmgrd]
 command=/usr/bin/lldpmgrd
@@ -57,3 +84,5 @@ autostart=false
 autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
+dependent_startup=true
+dependent_startup_wait_for=lldp-syncd:running

dockers/docker-lldp-sv2/waitfor_lldp_ready.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# Current lldpd version has a bug.
+# When lldpd starts it is in the pause state by default
+# But then it execute 'lldpcli resume' to configure and unpause itself.
+# When lldpd execute lldpcli, it doesn't check the return code
+# Sometimes lldpcli returns failure, but lldpd doesn't catch it
+# and keeps working paused and unconfigured
+#
+# The fix below addresses the issue.
+#
+
+# wait until lldpd started
+until [[ -e /var/run/lldpd.socket ]];
+do
+    sleep 1;
+done
+
+# Manually try to resume lldpd, until it's successful
+while /bin/true;
+do
+    lldpcli -u /var/run/lldpd.socket -c /etc/lldpd.conf -c /etc/lldpd.d resume > /dev/null && break
+    sleep 1
+done