add

notizen

@@ -21,3 +21,121 @@ StandardOutput=append:/var/log/vmstat.log
 VMSTAT_OPTS=-ntw
 VMSTAT_DELAY=3
 VMSTAT_LOG=/var/log/vmstat.log
+
+###############################
+#oneShort beispiel
+#vorbereitung 
+cp -a /usr/share/doc /usr/share/doc2
+#Unit
+systemctl edit --full --force my_oneshot
+[Unit]
+Description=tar/untar doc2
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/tar -czf /usr/share/doc2.tgz /usr/share/doc2
+ExecStart=/usr/bin/rm -r /usr/share/doc2
+
+ExecStop=/usr/bin/tar -xvzf /usr/share/doc2.tgz
+ExecStop=/bin/rm /usr/share/doc2.tgz
+RemainAfterExit=yes
+
+####################
+#typen
+#
+#simple
+#oneshot
+#always
+#
+#
+#Ubunut optimieren 
+#rm /etc/iniramfs-tools/conf.d/resume
+#update-initramfs -k all -u
+#
+#
+systemd-cgtop besser als top
+
+###############Unit mit Multiparameter
+#
+#Vorbereitung 
+/etc/default/vmstatd
+VMOPTS=-ntw
+VMLOG=/var/tmp/vmstatd.log
+VMDELAY=10
+#VMCOUNT=
+# Unit
+[Unit]
+Description=VMStat Daemon
+StartLimitIntervalSec=2 min
+StartLimitBurst=3
+OnFailure=trig.service
+
+[Service]
+Restart=on-failure
+RestartSec=20
+RestartForceExitStatus=SIGHUP
+EnvironmentFile=/etc/default/vmstatd
+ExecStart=/bin/sh -c "exec /usr/bin/vmstat $VMOPTS $VMDELAY $VMCOUNT >> $VMLOG"
+########################
+#Namespace
+# Beispiel mit ip
+#Namespace erzeugen
+ls -l /proc/self/ns
+ip netns add ns1
+ip netns exec ns1 /bin/bash
+ip l
+ip a
+exit
+ip netns pids ns1
+ls -l /run/netns
+ip netns del ns1
+
+#veth (virtuelles Netzwerkkabel)
+#Shell isolieren
+ip link add name veth1 type veth peer name veth2
+ip l
+ip netns add ns1
+ip link set dev veth2 netns ns1
+ip l set dev veth1 up
+ip addr change 172.16.0.1/16 dev veth1
+ip netns exec ns1 ip l set dev veth2 up
+ip netns exec ns1 ip addr change 172.16.0.2/16 dev veth2
+ping 172.16.0.2
+ip netns exec ns1 /bin/bash
+ip a
+ip r
+ping 172.16.0.1
+ip l del dev veth1
+ip netns del ns1
+
+#isolierter ssh-Server
+#Zwei Fenster, z.B. in tmux, links=server, rechts=client
+
+ip link add name vethsrv0 type veth peer name vethcli0
+ip netns add srv
+ip netns add cli
+ip link set vethsrv0 netns srv
+ip link set vethcli0 netns cli
+ip l
+
+#Server (links)
+ip netns exec srv /bin/bash
+ip link set up dev vethsrv0
+ip addr change 10.9.8.7/24 dev vethsrv0 
+
+#SSH Server starten
+/sbin/sshd -dD
+
+#Client (rechts)
+ip netns exec cli /bin/bash
+ip link set up dev vethcli0
+ip addr change 10.9.8.6/24 dev vethcli0 
+
+#Connect
+ip a
+ssh 10.9.8.7
+ip a
+exit
+####################################
+
+