add systemd service-unit-files

src/etc/systemd/system/multiplexer.target

@@ -0,0 +1,5 @@
+[Unit]
+Description=Multiplexer target for screen and tmux-server
+
+[Install]
+WantedBy=multi-user.target

src/etc/systemd/system/tmux@.service

@@ -0,0 +1,26 @@
+[Unit]
+Description=tmux default session (detached) for user %i
+Documentation=man:tmux(1)
+BindsTo=multiplexer.target
+After=sssd.service
+
+[Service]
+#Type=simple
+Type=forking
+User=%i
+WorkingDirectory=/home/%i
+ExecStartPre=-/usr/bin/xdg-user-dirs-update
+#RemainAfterExit=yes
+# On older tmux-versions session-names with dot in name are not allwed, so replace "-s %I" with "-s User"
+ExecStart=/usr/bin/tmux new-session -d -s User
+#ExecStart=/usr/bin/tmux new-session 
+ExecStop=-/usr/bin/tmux kill-server
+KillMode=mixed
+#Restart=on-success
+Restart=always
+RestartSec=3s
+GuessMainPID=true
+
+[Install]
+WantedBy=multiplexer.target
+