Merge branch 'master' into vhs

system/monitoring.md

@@ -0,0 +1,24 @@
+---
+title: "Monitoring"
+tags: [ "Documentation", "System", "CPU", "Memory" ]
+---
+
+Print the average CPU load over 1 minute, 5 minutes, and 15 minutes:
+
+```bash
+watch -d cat /proc/loadavg
+stress="$(cat /proc/loadavg | awk '{print "Usage:" $2"%"}')"
+```
+
+Show memory usage in Gibitytes.
+
+```bash
+free -g
+```
+Show low and high gigibtye usage on a *l*ine, and repeat the measurement every 5 seconds:
+
+```bash
+REP=5
+free --lohi -g -s $REP | lolcat
+```
+

system/systemd/journal.md

@@ -2,6 +2,18 @@
 title: "journal"
 tags: [ "Documentation", "systemd" ]
 ---
+
+See a running log of all system messages:
+
+
+```bash
+journalctl -f
+```
+
+Or just one unit (`sshd`):
+
+```bash
+journalctl -f -u sshd
 ```
 
 Find errors since November
@@ -14,3 +26,13 @@ Limit size to 2G.
 
 ```bash
 journalctl --vacuum-size=2G
+```
+
+Log the fact that you've installed your own `dnsmasq` on your system to `journalctl`, so that you can notice why your system's broken:
+
+
+```bash
+logger "Installed new dnsmasq"
+sudo journalctl -f
+```
+