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

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Merged
instantlinux merged 1 commit into from
Aug 30, 2025
Merged

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

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9 changes: 6 additions & 3 deletions images/nut-upsd/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -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 \
Expand All @@ -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
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3 changes: 3 additions & 0 deletions images/nut-upsd/README.md
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Expand Up @@ -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
Expand Down Expand Up @@ -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:
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1 change: 1 addition & 0 deletions images/nut-upsd/entrypoint.sh
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Expand Up @@ -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
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