Issue #213 nut-upsd image - version 2.8.3 with ulimit (#220)

Author: instantlinux

images/nut-upsd/Dockerfile

@@ -7,7 +7,7 @@ LABEL org.opencontainers.image.authors="Rich Braun docker@instantlinux.net" \
     org.label-schema.name=nut-upsd \
     org.label-schema.vcs-ref=$VCS_REF \
     org.label-schema.vcs-url=https://github.com/instantlinux/docker-tools
-ARG NUT_VERSION=2.8.2-r2
+ARG NUT_VERSION=2.8.3-r2
 ENV API_USER=upsmon \
     API_PASSWORD= \
     DESCRIPTION=UPS \
@@ -21,13 +21,16 @@ ENV API_USER=upsmon \
     SECRETNAME=nut-upsd-password \
     SERIAL= \
     SERVER=master \
+    ULIMIT=2048 \
     USER=nut \
     VENDORID=
 HEALTHCHECK CMD upsc $NAME@localhost:3493 2>&1|grep -q stale && \
     killall -TERM upsmon || true
 
-RUN apk add --no-cache dash && \
-    apk add --update --no-cache nut=$NUT_VERSION \
+RUN echo '@edge http://dl-cdn.alpinelinux.org/alpine/edge/community' \
+      >>/etc/apk/repositories && \
+    apk add --no-cache dash && \
+    apk add --update --no-cache nut@edge=$NUT_VERSION \
       busybox linux-pam \
       libcrypto3 libssl3 \
       libusb musl net-snmp-libs util-linux

images/nut-upsd/README.md

@@ -51,6 +51,7 @@ SDORDER | | UPS shutdown sequence, set to -1 to disable shutdown
 SECRETNAME | nut-upsd-password | name of secret to use for API user
 SERIAL | | hardware serial number of UPS
 SERVER | master | master or slave priority for scripts
+ULIMIT | 2048 | open-files ulimit
 USER | nut | local user
 VENDORID | | vendor ID for ups.conf
 ### Notes
@@ -115,6 +116,8 @@ EOF
 udevadm control --reload-rules && udevadm trigger
 ```
 
+When starting up under Debian trixie, an out-of-memory error can be prevented by setting the nofile ulimit to a smaller value than system default: see [issue #1672](https://github.com/networkupstools/nut/issues/1672). The default is set here to 2048.
+
 ### Secrets
 
 If the API user needs a password, you have two ways to specify it: pass the value itself as environment variable API_PASSWORD, or define a Docker secret as follows:

images/nut-upsd/entrypoint.sh

@@ -69,6 +69,7 @@ chown $USER:$GROUP /dev/shm/nut
 echo 0 > /var/run/nut/upsd.pid && chown $USER:$GROUP /var/run/nut/upsd.pid
 echo 0 > /var/run/upsmon.pid
 
+ulimit -n $ULIMIT
 /usr/sbin/upsdrvctl -u root start
 /usr/sbin/upsd -u $USER
 exec /usr/sbin/upsmon -D