运行"docker run"来自crontab [英] run "docker run" from crontab
问题描述
我尝试从运行在Docker容器中的postgresql数据库进行自动备份(每晚4点).
I try to make automated (every night at 4) backups from a postgresql database running inside a docker container.
#!/bin/sh
CONTAINER=`docker ps|grep name_of_container|awk '{print $1}'`
USER='postgre_user'
PASSWORD='changed'
BUDIR='/some/path/backup/'
docker run -it --link $CONTAINER:db -v $BUDIR:/backup/ -e "PGPASSWORD=$PASSWORD" pg_dump -h db -U $USER -Fc -f /backup/$(date +%Y-%m-%d-%H-%M-%S).dump
我的crontab看起来像这样:
My crontab looks like this:
0 4 * * * /path/to/script.sh
当我手动执行该脚本时,该脚本可以很好地运行,并且也可以从cron中执行(我尝试* * * * *用于调试).
The script works fine when I execute it manually and it also get executed from cron (I tried * * * * * for debugging).
我不知道如何使cron和脚本一起工作.到目前为止,我尝试过:
I can't figure out how to make cron and the script work together. So far I tried:
- 将变量写入日志文件
- 检查crontab的输出(
* * * * * [...]&> cron.log
) - 检查
docker exec [...]>的输出脚本中的output.log
$ CONTAINER
包含正确的docker id,创建了cron.log和output.log,但为空.
$CONTAINER
contains the correct docker id when run from cron, cron.log and output.log are created but empty.
有什么想法吗?
推荐答案
从cron运行时无法使用 docker run -it --link [...]
-我使用docker立即运行--link [...]
.
Can't use docker run -it --link [...]
when running from cron - I use docker run --link [...]
now.
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