Allow for changing Java mem limit

Author: aptalca

README.md

@@ -53,6 +53,7 @@ docker create \
   --name=unifi-controller \
   -e PUID=1000 \
   -e PGID=1000 \
+  -e MEM_LIMIT=1024M `#optional` \
   -p 3478:3478/udp \
   -p 10001:10001/udp \
   -p 8080:8080 \
@@ -96,6 +97,7 @@ services:
     environment:
       - PUID=1000
       - PGID=1000
+      - MEM_LIMIT=1024M #optional
     volumes:
       - <path to data>:/config
     ports:
@@ -126,6 +128,7 @@ Container images are configured using parameters passed at runtime (such as thos
 | `-p 6789` | For throughput test |
 | `-e PUID=1000` | for UserID - see below for explanation |
 | `-e PGID=1000` | for GroupID - see below for explanation |
+| `-e MEM_LIMIT=1024M` | Optionally change the Java memory limit (-Xmx) (default is 1024M). |
 | `-v /config` | All Unifi data stored here |
 
 ## User / Group Identifiers
@@ -225,5 +228,6 @@ Once registered you can define the dockerfile to use with `-f Dockerfile.aarch64
 
 ## Versions
 
+* **29.07.19:** - Allow for changing Java mem limit via new optional environment variable.
 * **23.03.19:** - Switching to new Base images, shift to arm32v7 tag.
 * **10.02.19:** - Initial release of new unifi-controller image with new tags and pipeline logic

readme-vars.yml

@@ -14,6 +14,11 @@ available_architectures:
   - { arch: "{{ arch_arm64 }}", tag: "arm64v8-latest"}
   - { arch: "{{ arch_armhf }}", tag: "arm32v7-latest"}
 
+# optional container parameters
+opt_param_usage_include_env: true
+opt_param_env_vars:
+  - { env_var: "MEM_LIMIT", env_value: "1024M", desc: "Optionally change the Java memory limit (-Xmx) (default is 1024M)." }
+
 # Optional Block
 optional_block_1: true
 optional_block_1_items:
@@ -70,5 +75,6 @@ app_setup_block: |
 
 # changelog
 changelogs:
+  - { date: "29.07.19:", desc: "Allow for changing Java mem limit via new optional environment variable." }
   - { date: "23.03.19:", desc: "Switching to new Base images, shift to arm32v7 tag." }
   - { date: "10.02.19:", desc: "Initial release of new unifi-controller image with new tags and pipeline logic" }

root/etc/services.d/unifi/run

@@ -2,5 +2,9 @@
 
 cd /config || exit
 
+if [ -z ${MEM_LIMIT+x} ]; then
+  MEM_LIMIT="1024M"
+fi
+
 exec \
-	s6-setuidgid abc java -Xmx1024M -jar /usr/lib/unifi/lib/ace.jar start
+	s6-setuidgid abc java -Xmx"${MEM_LIMIT}" -jar /usr/lib/unifi/lib/ace.jar start