首先alpine内嵌的是BusyBox，使用alpine的crontab实际就是使用BusyBox的crond服务。
配置文件的位置：/var/spool/cron/crontabs/root，原始内容是：
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| # do daily/weekly/monthly maintenance
# min hour day month weekday command
*/15 * * * * run-parts /etc/periodic/15min
0 * * * * run-parts /etc/periodic/hourly
0 2 * * * run-parts /etc/periodic/daily
0 3 * * 6 run-parts /etc/periodic/weekly
0 5 1 * * run-parts /etc/periodic/monthly
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可以在后面添加自己的定时任务：
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| # do daily/weekly/monthly maintenance
# min hour day month weekday command
*/15 * * * * run-parts /etc/periodic/15min
0 * * * * run-parts /etc/periodic/hourly
0 2 * * * run-parts /etc/periodic/daily
0 3 * * 6 run-parts /etc/periodic/weekly
0 5 1 * * run-parts /etc/periodic/monthly
* * * * * echo 'test'
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使用docker-compose部署定时任务
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| version: "2"
services:
crond:
image: alpine:3.4
volumes:
- ./crontabs/root:/var/spool/cron/crontabs/root
command: crond -f
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