redirect ngnix/supervisor logs to stdout/stderr for docker awslogs driver

Dockerfile-base

@@ -52,3 +52,10 @@ RUN \
   cp objs/ngx_http_lua_module.so /usr/lib/nginx/modules/ngx_http_lua_module.so && \
   cd /tmp && \
   rm -R /tmp/*
+
+# borrowed from: https://docs.docker.com/config/containers/logging/ &
+#  https://github.com/nginxinc/docker-nginx/blob/8921999083def7ba43a06fabd5f80e4406651353/mainline/jessie/Dockerfile#L21-L23
+
+# forward request and error logs to docker log collector
+RUN ln -sf /dev/stdout /var/log/nginx/access.log \
+  && ln -sf /dev/stderr /var/log/nginx/error.log

conf/supervisord.conf

@@ -3,17 +3,35 @@ nodaemon=true
 
 [program:nginx-app]
 command = /usr/sbin/nginx
+stderr_logfile = /dev/stderr
+stderr_logfile_maxbytes = 0
+stderr_logfile_backups = 0
+stdout_logfile = /dev/stdout
+stdout_logfile_maxbytes = 0
+stdout_logfile_backups = 0
 autostart=true
 autorestart=true
 
 [program:omaha]
 command=/usr/local/bin/uwsgi --ini /srv/omaha/conf/uwsgi.ini
+stderr_logfile = /dev/stderr
+stderr_logfile_maxbytes = 0
+stderr_logfile_backups = 0
+stdout_logfile = /dev/stdout
+stdout_logfile_maxbytes = 0
+stdout_logfile_backups = 0
 autostart=true
 autorestart=true
 stopsignal=QUIT
 
 [program:celery]
 command=celery worker -B -A omaha_server --loglevel=INFO
+stderr_logfile = /dev/stderr
+stderr_logfile_maxbytes = 0
+stderr_logfile_backups = 0
+stdout_logfile = /dev/stdout
+stdout_logfile_maxbytes = 0
+stdout_logfile_backups = 0
 directory=/srv/omaha/omaha_server
 environment=C_FORCE_ROOT="true"
 numprocs=1
@@ -25,10 +43,22 @@ killasgroup=true
 
 [program:s3fs]
 command=/usr/bin/s3fs %(ENV_AWS_STORAGE_BUCKET_NAME)s /srv/omaha_s3 -f -ouse_cache=/tmp -oiam_role=%(ENV_AWS_ROLE)s
+stderr_logfile = /dev/stderr
+stderr_logfile_maxbytes = 0
+stderr_logfile_backups = 0
+stdout_logfile = /dev/stdout
+stdout_logfile_maxbytes = 0
+stdout_logfile_backups = 0
 autostart=true
 autorestart=true
 
 [program:filebeat]
 command = service filebeat start
+stderr_logfile = /dev/stderr
+stderr_logfile_maxbytes = 0
+stderr_logfile_backups = 0
+stdout_logfile = /dev/stdout
+stdout_logfile_maxbytes = 0
+stdout_logfile_backups = 0
 autostart=true
 autorestart=true