Crond image.

  needs:

    - job: build-sshd

      artifacts: true

# crond image:

build-crond:

  extends: .build

  variables:

    CONTEXT: crond

push-crond:

  extends: .push

  variables:

    CONTEXT: crond

    IMAGE: cron

  needs:

    - job: build-crond

      artifacts: true

*

FROM alpine:3.14 as downloader

ARG URL=https://github.com/aptible/supercronic/releases/download/v0.1.12/supercronic-linux-amd64

ARG SHA1SUM=048b95b48b708983effb2e5c935a1ef8483d9e3e

WORKDIR /tmp

RUN wget -q $URL && \

    echo "$SHA1SUM  supercronic-linux-amd64" > sha1.sum && \

    sha1sum -c sha1.sum && \

    install -m 755 supercronic-linux-amd64 /usr/local/bin/supersonic && \

    touch /crontab

FROM alpine:3.14

COPY --from=downloader /usr/local/bin/supersonic /usr/local/bin/supersonic

COPY --from=downloader /crontab /crontab

WORKDIR /tmp

USER nobody

CMD [ "supersonic", "/crontab" ]

HEALTHCHECK CMD pgrep supersonic

RUN supersonic -test /crontab

ONBUILD COPY crontab /crontab

ONBUILD RUN supersonic -test /crontab

# Cron docker

A Docker image for running a Cron daemon, actually running

[Supersonic](https://github.com/aptible/supercronic).

## Usage

There are possible usage patterns for this image. The first is using it in a

multi-stage image build as the source of the `supersonic` binary to incorporate

in your own image like so:

```

FROM registry.shore.co.il/cron as supersonic

FROM alpine:latest

COPY --from=supersonic /usr/local/bin/supersonic /usr/local/bin/

```

The other pattern is building on top of this image to run some periodic tasks.

The `ONBUILD` commands will copy the crontab file and validate it. Just copy

whatever scripts and install whatever packages you need, like so:

```

FROM registry.shore.co.il/cron

COPY script /usr/local/bin/

USER root

RUN apk add --update --no-cache aws-cli

USER nobody

```