fix(119): ulimit is optional (not enabled by default) (#122)

Dockerfile

@@ -210,6 +210,9 @@ ENV SERVICE_ENABLE_IMPORT_OVER_NETCAT false
 ENV SERVICE_ENABLE_ADSBEXCHANGE false
 ENV SERVICE_ENABLE_PLANEFINDER false
 
+# System properties
+ENV ULIMIT_N -1
+
 LABEL maintainer="maugin.thomas@gmail.com"
 
 # COPY ALL

README.md

@@ -296,6 +296,14 @@ See: https://openweathermap.org/price
 
 Ex : `-e "LAYERS_OWM_API_KEY=dsf1ds65f4d2f65g"`
 
+## System:
+
+| Environment Variable                     | Default value   | Description                                                                                                                                  |
+| ---------------------------------------- | --------------- | -------------------------------------------------------------------------------------------------------------------------------------------- |
+| `ULIMIT_N`                               | -1              | Enforce ulimit like docker <=22 to prevent OOM issues (-1 mean not enforced), recommended value when crash 1048576                           |
+
+Ex : `-e "ULIMIT_N=1048576"`
+
 # Build it yourself
 
 Clone this repo.

root/etc/s6-overlay/s6-rc.d/http/run

@@ -5,7 +5,9 @@ if [ "$SERVICE_ENABLE_HTTP" != "false" ]; then
 
     # enforce ulimit like docker <=22 to prevent OOM issues
     # see https://github.com/Thom-x/docker-fr24feed-piaware-dump1090/issues/107
-    ulimit -n 1048576
+    if [ "$ULIMIT_N" != "-1" ]; then
+        ulimit -n "$ULIMIT_N"
+    fi
 
     /thttpd -D -h 0.0.0.0 -p 8080 -d /usr/lib/fr24/public_html -l - -M 60 2>&1 | mawk -W interactive '{printf "%c[32m[http]%c[0m %s\n", 27, 27, $0}'
     # stdbuf ...  --  (remove blank lines from output)