On 27 Feb 2020, at 14:42, Jonathan Billings wrote: > On Feb 27, 2020, at 08:01, Tobias Kirchhofer <collect at shift.agency> > wrote: >> >> Hi, >> >> we experience difficulties with crond behaviour sending mail since >> CentOS 8.1. The cron job is the same like we used in CentOS 7. >> >> crontab -l >> /usr/bin/python3 -c 'import random; import time; >> time.sleep(random.random() * 3600)' && /usr/local/bin/backup.sh > > Is this literally what your crontab looks like? Because that’s not > valid crontab syntax. This is what it is literally: 0 5 * * * /usr/bin/python3 -c 'import random; import time; time.sleep(random.random() * 3600)' && /usr/local/bin/backup.sh >> backup.sh writes the backup to the remote backup server. There are >> around 30 machines with the same cron job. The python part spreads >> the jobs over an hour so that the backup server is not struck at once >> from about 30 machines. >> >> The change in behaviour is that crond sends no mail anymore. It is >> because of the logical and (&&). Without this crond sends mails. >> >> What has changed in CentOS 8 and does anyone has an idea how we could >> fix it? > > There aren’t any significant changes in ‘cronie’ in 8.1, looking > at the spec file. > > Assuming the crontab you wrote above included the time spec too, I’d > check to make sure the first command isn’t exiting with a non-zero > exit code. The command chain is running propery, STDOUT output is visible in system log (excerpt from logwatch email): ``` --------------------- Cron Begin ------------------------ **Unmatched Entries** CMDOUT (### Starting backup. Host: host.example.com Backupserver: 10.9.1.5 Path: /borgbackup/vm/host-example-com Date: Fri Mar 20 05:13:46 CET 2020 ###) CMDOUT (Creating archive at "borg at IP:/borgbackup/vm/host-example-com::{now:%Y-%m-%d_%H:%M}") … ``` Its just not sending an email. What is additionally irritating is that it is only on a few machines. All machines are identically provisioned with ansible. The situation is not mission critical but it should work. Strange. Tobias > -- > Jonathan Billings <billings at negate.org> > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos -- collect at shift.agency