Initial Commit

2021-10-13 19:25:16 +02:00
commit fed26c8bbd
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--- a/solutions/07-backups.md
+++ b/solutions/07-backups.md
@ -0,0 +1,70 @@
+## Aufgabe 1a
+
+Datum       Wochentag   Backup-Methode   Band
+
+2020-11-02  Mon         Ink              Sohn-1
+2020-11-03  Tue         Ink              Sohn-2
+2020-11-04  Wed         Ink              Sohn-3
+2020-11-05  Thur        Ink              Sohn-4
+2020-11-06  Fri         Diff             Vater-1
+
+2020-11-09  Mon         Ink              Sohn-1
+2020-11-10  Tue         Ink              Sohn-2
+2020-11-11  Wed         Ink              Sohn-3
+2020-11-12  Thur        Ink              Sohn-4
+2020-11-13  Fri         Diff             Vater-2
+
+2020-11-16  Mon         Ink              Sohn-1
+2020-11-17  Tue         Ink              Sohn-2
+2020-11-18  Wed         Ink              Sohn-3
+2020-11-19  Thur        Ink              Sohn-4
+2020-11-20  Fri         Diff             Vater-3
+
+2020-11-23  Mon         Ink              Sohn-1
+2020-11-24  Tue         Ink              Sohn-2
+2020-11-25  Wed         Ink              Sohn-3
+2020-11-26  Thur        Ink              Sohn-4
+2020-11-27  Fri         Diff             Vater-4
+
+## Aufgabe 1b
+
+Datum       Wochentag   Backup-Methode    Band
+2020-11-07  Fri         Diff              Vater-1
+2020-11-14  Fri         Diff              Vater-2
+2020-11-21  Fri         Diff              Vater-3
+2020-11-28  Fri         Diff              Vater-4
+2020-11-30  Mon         Voll              Großvater-1
+
+2020-12-04  Fri         Diff              Vater-1
+2020-12-11  Fri         Diff              Vater-2
+2020-12-18  Fri         Diff              Vater-3
+2020-12-25  Fri         Diff              Vater-4
+2020-12-31  Thur        Voll              Großvater-2
+
+2021-01-01  Fri         Diff              Vater-1
+2021-01-08  Fri         Diff              Vater-2
+2021-01-15  Fri         Diff              Vater-3
+2021-01-22  Fri         Diff              Vater-4
+2021-01-29  Fri         Voll              Großvater-3
+
+## Praxisaufgabe
+
+### Teilaufgabe A
+Drei Monate, zwei Wochen und einen Tag zurück vom 6. November 2020.
+
+```bash
+$ date --date '2020-11-06 - 3 month - 2 week - 1 day' '+%A, %d %B %Y'
+Montag, 22 Juli 2020
+```
+
+Benötigte Backups
+Großvater-Backup    07. August 2020
+
+### Teilaufgabe B
+
+28.10.2020
+
+Benötigte Backups
+Großvater-Backup    02. Oktober 2020
+Vater-Backup        09. 16. und 23. Oktober 2020
+Sohn-Backup         26. 27. und 28. Oktober 2020
--- a/solutions/overlayfs.sh
+++ b/solutions/overlayfs.sh
@ -0,0 +1,38 @@
+#!/bin/bash
+
+# 7a
+mkdir --parent /root/workspace/overlayfs
+cd /root/workspace/overlayfs
+
+# 7b1
+mkdir --parent ./lower_0/usr/bin
+touch ./lower_0/usr/bin/mybin
+
+# 7b2
+mkdir --parent ./lower_1/etc/mybin
+touch ./lower_1/etc/mybin/config.json
+
+# 7b3
+mkdir --parent ./lower_2/var/log/mybin
+touch ./lower_2/var/log/mybin/info.log
+
+# 7b4
+mkdir --parent ./lower_3/usr/lib/systemd/system
+touch ./lower_3/usr/lib/systemd/system/mybin.service
+
+# 7b5
+mkdir --parent ./lower_4/etc/mybin/conf.d/
+touch ./lower_4/etc/mybin/conf.d/sqlite.config
+
+# 7b6
+mkdir --parent ./lower_5/etc/mybin/conf.d/
+touch ./lower_4/etc/mybin/conf.d/postgresql.config
+
+# 7c
+mkdir --parent ./upper_application ./upper_application_plugins
+mkdir --parent ./workdir_application ./workdir_application_plugins
+mkdir --parent ./application ./application_plugins
+
+mount -t overlay -o lowerdir=$(pwd)/lower_0:$(pwd)/lower_1:/$(pwd)/lower_2:/$(pwd)/lower_3,upperdir=$(pwd)/upper_application,workdir=$(pwd)/workdir_application overlayfs $(pwd)/application
+
+mount -t overlay -o lowerdir=$(pwd)/lower_0:$(pwd)/lower_1:/$(pwd)/lower_2:/$(pwd)/lower_3:/$(pwd)/lower_4:/$(pwd)/lower_5,upperdir=$(pwd)/upper_application_plugins,workdir=$(pwd)/workdir_application_plugins overlayfs $(pwd)/application_plugins