** Description changed: + [Impact] + + * System logs are lost across reboots because they are not stored + persistently. + + [Test Case] + + * Fresh installations, or upgrades to this version of systemd, should create /var/log/journal and trigger automatic persistent logs. + * Users may choose to remove said directory, or disable persistent logging in /etc/systemd/journald.conf + + [Regression Potential] + + * Persistent logging by default will cause logs to be flushed from /run + to /var/log, meaning there will be less RAM used (/run is tmpfs backed), + but increased disk usage (in /var/log). The journald daemon has limits + set for logs, meaning they will be rotated and discarded and should not + cause out of disk-space errors. + + [Other Info] + + * Original bug report + After upgrading 14.04 -> 16.04, key services are now running on systemd and using the systemd journal for logging. In 14.04, key system logs like /var/log/messages and /var/log/syslog were persistent, but after the upgrade to 16.04 there has a been a regression of sorts: Logs sent to systemd's journald are now being thrown away during reboots. This behavior is controlled by the `Storage=` option in `/etc/systemd/journald.conf`. The default setting is `Storage=auto` which will persist logs in `/var/log/journal/`, *only if the directory already exists*. But the directory was not created as part of the 14.04 -> 16.04 upgrade, so logging was being lost for a while before I realized what was happening. This issue could be solved by either creating /var/log/journal or changing the default Storage behavior to `Storage=persistent`, which would create the directory if need be. ## Related reference - * `systemd` currently compounds the issue by having ["journal --disk-usage" report memory usage as disk usage](https://github.com/systemd/systemd/issues/4059), giving the impression that the disk is being used for logging when it isn't. - * [User wonders where to find logs from previous boots, unaware that the logs were thrown away](http://askubuntu.com/questions/765315/how-to-find-previous-boot-log-after-ubuntu-16-04-restarts) + * `systemd` currently compounds the issue by having ["journal --disk-usage" report memory usage as disk usage](https://github.com/systemd/systemd/issues/4059), giving the impression that the disk is being used for logging when it isn't. + * [User wonders where to find logs from previous boots, unaware that the logs were thrown away](http://askubuntu.com/questions/765315/how-to-find-previous-boot-log-after-ubuntu-16-04-restarts) ## Recommended fix Restoring persistent logging as the default is recommended.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1618188 Title: systemd journal should be persistent by default: /var/log/journal should be created To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1618188/+subscriptions -- ubuntu-bugs mailing list firstname.lastname@example.org https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs