I did this a while back, thinking I'd replace it with something more
elegant when I have time... honestly, it's been working so well, I haven't
thought about it again, until you reminded me.
I have a script saved in my ansible git repo:
$GIT/ansible/bin/cron_scheduler.sh
#!/bin/bash
PATH=/bin:/usr/bin
helptext() {
echo "Usage: $0 -i ip_address -f frequency" >&2
echo "Example: $0 -i 10.10.5.160 -f 15 # run once every 15
minutes" >&2
exit 1
}
if [ "$#" -ne 4 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
helptext
fi
while getopts i:f: option
do
case "${option}"
in
i) ip_address=${OPTARG};;
f) frequency=${OPTARG};;
*) helptext;;
esac
done
decimal=$(echo $ip_address | sed 's/\./+/g' | bc)
ip_rand=$(expr $decimal % $frequency)
x=$ip_rand
declare -a minutes=$ip_rand
count=0
while [ $x -lt 60 ]
do
next=$(expr "${minutes[$count]}" + $frequency)
if [ $next -lt 60 ] ; then
minutes=("${minutes[@]}" "$next")
fi
(( count++ ))
x=$next
done
echo -n ${minutes[@]} | tr " " ,
So running this:
cron_scheduler.sh -i 10.10.5.160 -f 15
results in this output:
5,20,35,50
(every 15 minutes)
So just decide how frequently you want to schedule the task, and pass in
the IP address. voila.
- name: pick a minute to run example
script: bin/cron_scheduler.sh -i {{ ansible_default_ipv4.address }} -f 10
register: cron_minutes
- name: configure example
template: src=example/example.cron dest=/etc/cron.d/example.cron
owner=root group=root mode=0644
and the template would have something like this:
{{cron_minutes.stdout}} * * * * root /usr/local/bin/example
--------
Brent
--------
On Wed, Apr 2, 2014 at 7:29 PM, Martin Božič <[email protected]> wrote:
> Hi,
>
> I want to dynamically every new host to the backup server with rsnapshot.
> I have no problems putting SSH keys on backup target hosts and putting a
> template and exclude config for the target host into /etc/rsnapshot.d on
> backup host.
>
> The problem is when I try to add the rsnapshot cronjob for the new host.
> And here's the trick - I'm trying to add different times for each host
> because I don't want them to all hit the backup disk at the same time. So I
> figured I could put several cron time vars for each host in host_vars/
> directory. Here's an example of what I'm trying to pull-off with cron
> module:
>
> FILE: roles/common/backup.yml
> -----------------------------
> - name: weekly rsnapshot cron
> cron: name="rsnap {{ ansible_fqdn }} (upravlja Ansible)"
> weekday={{ rsnap_weekly_day }} hour={{ rsnap_weekly_hour }}
> minute={{ rsnap_weekly_min }} user="root"
> job="rsnapshot -c /etc/rsnapshot.d/{{ ansible_fqdn }}.conf weekly"
> cron_file="rsnap-{{ ansible_fqdn }}"
> delegate_to: backuphost
>
> FILE: host_vars/newhost
> --------------------
> rsnap_hourly_min: 12
> rsnap_daily_min: 45
> rsnap_daily_hour: 1
> rsnap_weekly_min: 30
> rsnap_weekly_hour: 21
> rsnap_weekly_day: 3
>
> What happens is that backuphost picks up the var of newhost and then cries
> foul:
>
> fatal: [backuphost] => One or more undefined variables:
> 'rsnap_daily_hour' is undefined
>
> I'm running out of ideas how I could do it. I've looked into several loops
> but I'm still a beginner with Ansible and YAML syntax, so if anyone has any
> idea how this delegation could work I'd really appreciate it!
>
> Regards,
> Martin
>
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