[Services] Restart Telemetry service upon unexpected critical process exit. (#3768)

Signed-off-by: Yong Zhao <yozhao@microsoft.com>

dockers/docker-sonic-telemetry/Dockerfile.j2

@@ -35,5 +35,7 @@ RUN apt-get clean -y      && \
 
 COPY ["start.sh", "telemetry.sh", "dialout.sh", "/usr/bin/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
+COPY ["files/supervisor-proc-exit-listener", "/usr/bin"]
+COPY ["critical_processes", "/etc/supervisor"]
 
 ENTRYPOINT ["/usr/bin/supervisord"]

dockers/docker-sonic-telemetry/critical_processes

@@ -0,0 +1,2 @@
+telemetry
+dialout

dockers/docker-sonic-telemetry/supervisord.conf

@@ -3,6 +3,12 @@ logfile_maxbytes=1MB
 logfile_backups=2
 nodaemon=true
 
+[eventlistener:supervisor-proc-exit-listener]
+command=/usr/bin/supervisor-proc-exit-listener
+events=PROCESS_STATE_EXITED
+autostart=always
+autorestart=unexpected
+
 [program:start.sh]
 command=/usr/bin/start.sh
 priority=1
@@ -15,7 +21,7 @@ stderr_logfile=syslog
 command=/usr/sbin/rsyslogd -n
 priority=2
 autostart=false
-autorestart=false
+autorestart=true
 stdout_logfile=syslog
 stderr_logfile=syslog
 
@@ -23,7 +29,7 @@ stderr_logfile=syslog
 command=/usr/bin/telemetry.sh
 priority=3
 autostart=false
-autorestart=true
+autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog
 
@@ -31,6 +37,6 @@ stderr_logfile=syslog
 command=/usr/bin/dialout.sh
 priority=4
 autostart=false
-autorestart=true
+autorestart=false
 stdout_logfile=syslog
 stderr_logfile=syslog

files/build_templates/telemetry.service.j2

@@ -3,12 +3,16 @@ Description=Telemetry container
 Requires=database.service
 After=database.service swss.service syncd.service
 Before=ntp-config.service
+StartLimitIntervalSec=1200
+StartLimitBurst=3
 
 [Service]
 User={{ sonicadmin_user }}
 ExecStartPre=/usr/bin/{{docker_container_name}}.sh start
 ExecStart=/usr/bin/{{docker_container_name}}.sh wait
 ExecStop=/usr/bin/{{docker_container_name}}.sh stop
+Restart=always
+RestartSec=30
 
 [Install]
 WantedBy=multi-user.target

rules/telemetry.mk

@@ -3,3 +3,4 @@
 SONIC_TELEMETRY = sonic-telemetry_0.1_$(CONFIGURED_ARCH).deb
 $(SONIC_TELEMETRY)_SRC_PATH = $(SRC_PATH)/telemetry
 SONIC_DPKG_DEBS += $(SONIC_TELEMETRY)
+$(SONIC_TELEMETRY)_FILES += $(SUPERVISOR_PROC_EXIT_LISTENER_SCRIPT)