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		| @@ -1,61 +0,0 @@ | ||||
| --- | ||||
| title: "logs" | ||||
| tags: [ "Documentation", "basics" ] | ||||
| --- | ||||
| ## Syslog Management Protocols | ||||
|  | ||||
| Let's look at the programs filling in things on our /var/log/ directory. | ||||
|  | ||||
| * rsyslog (common) | ||||
|  | ||||
| * syslog (old) | ||||
|  | ||||
| * syslog-ng (lots of content-based filtering) | ||||
|  | ||||
| * klogd (kernel-focussed) | ||||
|  | ||||
| # `rsyslog` | ||||
|  | ||||
| The config rests in /etc/rsyslog.conf, which then references /etc/rsyslog.d/. | ||||
|  | ||||
| # Systemd | ||||
| This thing makes its own logs with journald, and the journal's own logging system writes to /var/log/journal/ directory, which is then filled with nonsense. | ||||
|  | ||||
| You can obtain nonsense in systemd's own format by entering: | ||||
|  | ||||
| journalctl -e | ||||
|  | ||||
| This thing generates so much nonsense it can crash your system, but can at least be checked with: | ||||
|  | ||||
| > journalctl --disk-usage | ||||
|  | ||||
| ... in case you can't remember the `du` command. | ||||
|  | ||||
| You can limit the nonsense by editing the /etc/systemd/journald.conf file, and finding `#SystemMaxFileSize=` | ||||
|  | ||||
| # Logger | ||||
|  | ||||
| You can log things at any time with the logger: | ||||
|  | ||||
| > logger Server is being a dick! | ||||
|  | ||||
| Put things into a specific log with `-p`.  They can enter into, e.g., lpr (printer) log file with a priority of "critical", with: | ||||
|  | ||||
| > logger -p lpr.crit Help! | ||||
|  | ||||
| Logfiles rotate around and eventually get deleted.  Rotation means they get compressed. | ||||
|  | ||||
| Edit the config in /etc/logrotate.conf. | ||||
|  | ||||
| A few apps have their own special log rotation rules, kept in /etc/logrotate.d/. | ||||
|  | ||||
| The major variables to change are `weekly`, which compresses log files weekly, and `rotate 4`, which keeps 4 weeks worth of backlogs before deletion. | ||||
|  | ||||
| # Force Log Rotation | ||||
|  | ||||
| > sudo systemctl kill --kill-who=main --signal=SIGUSR2 systemd-journald.service | ||||
|  | ||||
| or just | ||||
|  | ||||
| > sudo systemctl restart systemd-journald.service | ||||
|  | ||||
| @@ -1,16 +0,0 @@ | ||||
| --- | ||||
| title: "keymaps" | ||||
| tags: [ "Documentation", "hardware" ] | ||||
| --- | ||||
| Find easy-to-read keymapping lists in `/usr/share/X11/xkb/keycodes/symbols/pc`. | ||||
|  | ||||
| If this doesn't work, try keymaps. | ||||
|  | ||||
| Keymaps codes can be found in `/usr/share/X11/xkb/keycodes/evdev`. | ||||
| Swap the numbers to swap symbols. | ||||
|  | ||||
| Check keymap with: | ||||
|  | ||||
| > setxkbmap -print -verbose 10 | ||||
|  | ||||
|  | ||||
| @@ -1,6 +1,6 @@ | ||||
| --- | ||||
| title: "basics" | ||||
| tags: [ "Documentation", "system" ] | ||||
| title: "systemd" | ||||
| tags: [ "Documentation", "systemd" ] | ||||
| --- | ||||
| > systemctl list-units | ||||
|  | ||||
|   | ||||
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