Crond doesn't in Rancher OS

RancherOS
1

Hello,

I’ve tried to setup some cron task on rancher OS with ubuntu console enabled.
Everything seems ok but the task is never executed, even with a * * * * * plannification (each minute).
I’ve tested with different installations of Rancher OS (0.4.2 & 0.4.3) with the same result…

Is it normal (I.E. have RancherOS a specificity that explain why crond doesn’t work properly) ?

2 Likes
2

Hello!
Same issue for me. My cron.d files and crontab are just ignored. Nothing in any logs. How can I run cron tasks?

3

Is a crond running…?
I think you have to build a crond (system-)container for that.

4

Did anyone end up figuring this out? Do I just need to spin up a crond system container to get this working?

I’d love to have a simple backup job run nightly on my Rancher Server.

5

Well, I ended up just setting things up so my Build Server running Ubuntu with a Jenkins Container just SSH’s into Rancher and runs the backup script as a part of the Build Server’s own backup cron job. Not a great work around, but it gets the job done.

6

Personally, I’ve no worry with crond on rancheros. I use it only for backup mysql db on my lab.

This is my cloud-config.yml

#cloud-config
hostname: rancher-server
write_files:
  - path: /var/spool/cron/crontabs/rancher
    permissions: "0600"
    owner: root
    group: rancher
    content: |
      * * * * * /bin/docker exec -t rancher-server1 mysqldump -A > /home/rancher/cattle.sql
  - path: /etc/rc.local
    permissions: "0755"
    owner: root
    content: |
      #!/bin/bash
      crond
rancher:
  services:
    rancher-server1:
      image: rancher/server
      restart: always
      ports:
        - 8080:8080
2 Likes
7

I’ve encountered the same problem.

I solved it using a bash script and supervisord

8

Thanks! That’s a good way to do it with RancherOS … having a crond running on reboot and a “persistent” crontab were just what I missed for running my docker routines that update images, remove exited docker processes and untagged images etc…