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vnext-nguyen-quyen/cron-tab-docker-logs.txt

Last active January 9, 2023 07:40
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  1. vnext-nguyen-quyen renamed this gist Jan 9, 2023. 1 changed file with 0 additions and 0 deletions.
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    1. Alpine (No need for redirection)

    using the default cron utility (busybox)

    ## Dockerfile
    =====
    FROM alpine:3.7

    # Setting up crontab
    COPY crontab /tmp/crontab
    RUN cat /tmp/crontab > /etc/crontabs/root


    CMD ["crond", "-f", "-l", "2"]
    =====

    ## Crontab
    =====
    * * * * * echo "Crontab is working - watchdog 1"
    =====

    2. Centos
    Redirection to /proc/1/fd/1 inside the crontab declaration line

    ## Dockerfile
    =====
    FROM centos:7

    RUN yum -y install crontabs

    ADD crontab /etc/cron.d/crontab
    RUN chmod 0644 /etc/cron.d/crontab
    RUN crontab /etc/cron.d/crontab


    CMD ["crond", "-n"]
    =====

    ## Crontab
    =====
    * * * * * echo "Crontab is working - watchdog 1" > /proc/1/fd/1
    =====


    => Test show cron ouput with docker logs {container_name}