wonderbeyond
10/31/2017 - 3:14 AM

Dockerfile for dcron (keywords: cron, crontab)

Dockerfile for dcron (keywords: cron, crontab)

index.md
content_copyfile_download
  • Rendered
  • Source

In scripts/ sub-directory are custom scripts called by crontab, e.g. arangodb-snapshot.sh for backingup arango database daily:

#!/bin/bash
set -e

BASE_DUMP_DIR=/var/lib/arangodb3/backups
CUR_DUMP_DIR="mydb-dump-`date '+%Y%m%d%H%M%S'`"
TAR_BALL="${CUR_DUMP_DIR}.tgz"

mkdir -p "$BASE_DUMP_DIR"
cd "$BASE_DUMP_DIR"

docker exec my-arango arangodump \
    --server.database=mydb \
    --server.username='root' --server.password='' \
    --output-directory="${BASE_DUMP_DIR}/${CUR_DUMP_DIR}"

tar -cvzf "$TAR_BALL" "$CUR_DUMP_DIR"

## Send to cloud-storage

## Notify success

Run:

docker run -v /var/run/docker.sock:/var/run/docker.sock -v /var/lib/amidala/arangodb3:/var/lib/arangodb3 cron
docker-entry.sh
content_copyfile_download
#!/bin/sh
set -e

# see: https://github.com/dubiousjim/dcron/issues/13
# ignore using `exec` for `dcron` to get another pid instead of `1`
# exec "$@"
"$@"
Dockerfile
content_copyfile_download
FROM docker

# Ref: https://github.com/xordiv/docker-alpine-cron

MAINTAINER wonderbeyond@gmail.com

RUN apk add --no-cache dcron bash tar
RUN mkdir -p /var/log/cron && touch /var/log/cron/cron.log
RUN rm -rf /etc/cron.d && mkdir -p /etc/cron.d

COPY ./docker-entry.sh /usr/local/bin
COPY ./scripts /usr/local/bin

RUN chmod +x /usr/local/bin/*

COPY ./crontabs/* /etc/cron.d

ENTRYPOINT ["docker-entry.sh"]
CMD ["crond", "-f", "-s", "/etc/cron.d", "-L", "/var/log/cron/cron.log"]