docker + supercronic

Use -debug to make it more verbose.

docker-compose.yml:

services:
  supercronic:
    build: .
    command: supercronic crontab

Dockerfile:

FROM alpine:3.17
RUN set -x \
    && apk add --no-cache supercronic shadow \
    && useradd -m app
USER app
COPY crontab .

Dockerfile (before Alpine Linux 3.15):

FROM alpine:3.17
RUN set -x \
    && apk add --no-cache go
RUN go install github.com/aptible/[email protected]

FROM alpine:3.17
RUN set -x \
    && apk add --no-cache shadow \
    && useradd -m app
USER app
COPY --from=0 /root/go/bin/supercronic /usr/local/bin/supercronic
COPY crontab .

crontab:

* * * * * date