Bearbeiten von „SystemD“

== Konfiguration ==
=== /etc/systemd/journald.conf ===
<pre>Storage=persistent
SystemMaxFileSize=50M
</pre>
* systemctl restart systemd-journald.service

== Kommandos ==
=== systemctl ===
<pre>
</pre>
=== journalctl ===
<pre>journalctl --since yesterday | --since "2016-03-16 02:00:00" | --since 09:00 --until "1 hour ago"
journalctl --list-boots
journalctl -b -1 # since last boot (relative pointer -1)
</pre>

== Beispiel Service Definitionsdatei ==
<pre>[Unit]
Description=Redis persistent key-value database
After=network.target

[Service]
ExecStart=/usr/local/bin/redis-server
ExecStop=/usr/local/bin/redis-shutdown
WorkingDirectory=/var/lib/redis
User=redis
Group=redis

[Install]
WantedBy=multi-user.target
</pre>
@@ Zeile 1: / Zeile 1: @@
-[[Kategorie:ServerApplikation]]
 == Konfiguration ==
 === /etc/systemd/journald.conf ===
@@ Zeile 10: / Zeile 8: @@
 == Kommandos ==
 === systemctl ===
-<pre>systemctl start nginx.service | stop | status | restart | reload
+<pre>
-systemctl enable nginx.service | disable
-systemctl list-units # laufende Services
-systemctl list-unit-files # verfügbare Services
-systemctl --failed # missglückte Starts
-systemctl mask nginx.service # Als nicht startbar markieren
-systemctl unmask nginx.service # mask aufheben
-systemctl list-units --type=target
-systemctl isolate graphical.target | rescue.target | multi-user.target
-systemctl set-default multi-user.target
-systemd-analyze
-systemd-analyze blame # Startzeiten der Services
 </pre>
 === journalctl ===
@@ Zeile 31: / Zeile 14: @@
 journalctl --list-boots
 journalctl -b -1 # since last boot (relative pointer -1)
-journalctl -u nginx.service -u php-fpm.service # by units
-journalctl -k # kernel messages
-journalctl --no-full # truncated info
-journalctl -a # all info
-journalctl -n 20 # only the last 20 lines
-journalctl -f # like tail -f
-journalctl --disk-usage # wie viel braucht das journal
-journalctl --vacuum-size=1G # Platz auf 1 GByte reduzieren
 </pre>
 == Beispiel Service Definitionsdatei ==
-* /lib/systemd/system/redis.service
 <pre>[Unit]
 Description=Redis persistent key-value database
@@ Zeile 57: / Zeile 30: @@
 [Install]
 WantedBy=multi-user.target
-</pre>
-= Konfiguration =
-* Einzelkonfigurationen in /etc/systemd.d
-<pre>cat > /etc/sysctl.d/98-no_overcommit.conf <<EOS
-# Select memory overcommitment operation mode.
-#
-# Mode 2 means that no more than
-#
-# SwapTotal + (MemTotal * vm.overcommit_ratio / 100)
-#
-# virtual memory can be allocated (Committed_AS) by processes. The resulting
-# limit will be displayed as CommitLimit. (All CamelCased values mentioned
-# here can be found in "/proc/meminfo".)
-#
-# Mode 1 means infinite overcommit - every allocation is allowed, no matter
-# how much memory is actually available.
-#
-# Mode 0 is similar but considers the available RAM when granting large
-# allocations - as long as only small allocations are made, they are also
-# always allowed.
-vm.overcommit_memory = 2
-# The conservative default for this is 50 %, meaning that at least half of the
-# RAM is left free for buffers and cache (after all swap has been filled up
-# already).
-#
-# Setting it to 98 % in the hope that 2 % free RAM will still be enough for all basic
-# system operation besides the page cache (for block buffers and kernel).
-vm.overcommit_ratio = 98
-EOS
-</pre>
-<pre>
-sysctl --system
 </pre>