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--- linux:systemd:journald [2018/12/17 07:46] – created niziak
+++ linux:systemd:journald [2024/09/17 16:32] (current) – niziak
@@ Line 1: / Line 1: @@
+====== journald ======
 Follow journal and show only entries with **err** priority
 <code bash>journalctl -p err -f</code>
-Vali priorities are (syslog):
+Valid priorities are (syslog):
   * 0 	emerg 	(panic / System is unusable)
   * 1 	alert   (Action must be taken immediately / A condition that should be corrected immediately, such as a corrupted system database)
@@ Line 11: / Line 13: @@
   * 6 	info 	 (Informational messages)
   * 7 	debug
+====== Assigning stderr priorities ======
+<code bash>man 3 sd-daemon</code>
+<code c>
+fprintf(stderr, SD_NOTICE "Hello World!\n")
+</code>
+====== reduce journal size ======
+<code bash>
+# runtime
+sudo journalctl --vacuum-size=50M
+# permanent
+echo SystemMaxUse=50M | sudo tee -a /etc/systemd/journald.conf
+</code>
+====== read journal from custom location ======
+<code bash>
+journalctl --directory=/mnt/var/lib/journal
+journalctl --file=/mnt/var/lib/journal/user-1000@*
+</code>