commit 1d8356088642f7d2ed4943c77bbaf0713e497b47
Author: Kuba Orlik <kontakt@kuba-orlik.name>
Date:   Wed Mar 17 17:54:36 2021 +0100

    Initial commit

diff --git a/HOW_TO_RUN.md b/HOW_TO_RUN.md
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+++ b/HOW_TO_RUN.md
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+pass init your-gpg-id
+
+ansible-playbook -i '157.90.240.248,rpi' backup.yml
diff --git a/backup.yml b/backup.yml
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+++ b/backup.yml
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+---
+- hosts: remote_server:rpi
+  tasks:
+    - set_fact: RPI_NAME=kuba-rpi
+    - set_fact: SERVER_NAME=my-server
+    - set_fact: SERVER_FQDN=my.example.com
+    - set_fact: OVPN_IP_PREFIX=10.8.10
+    - set_fact: RPI_BACKUP_DIR=/mnt/hdd/Backups
+
+- hosts: remote_server
+  become: yes
+  become_user: root
+  #  become_method: su
+
+  vars:
+    TO_INSTALL:
+      - openvpn
+      - restic
+      - ufw
+
+  tasks:
+    # - include_vars: secrets.yml
+
+    - name: install required packages
+      apt: state=present pkg={{ TO_INSTALL }}
+
+    - name: create ovpn key
+      ansible.builtin.command: "openvpn --genkey --secret {{RPI_NAME}}.key"
+      args:
+        chdir: /etc/openvpn/server
+        creates: /etc/openvpn/server/{{RPI_NAME}}.key
+
+    - name: Copy /etc/openvpn/server/{{RPI_NAME}}.key to /tmp/{{RPI_NAME}}.key
+      ansible.builtin.fetch:
+        src: /etc/openvpn/server/{{RPI_NAME}}.key
+        dest: /tmp/{{RPI_NAME}}.key
+        flat: yes
+
+    - name: Create ovpn config
+      ansible.builtin.template:
+        src: "ovpn-server.conf.j2"
+        dest: /etc/openvpn/server/{{RPI_NAME}}.conf
+
+    - name: open ovpn port (tcp)
+      ufw: rule=allow port=1194 proto=tcp
+
+    - name: open ovpn port (udp)
+      ufw: rule=allow port=1194 proto=udp
+
+    - name: start ovpn server
+      ansible.builtin.service:
+        name: openvpn-server@{{RPI_NAME}}
+        state: restarted
+        enabled: yes
+
+    - name: rpi in /etc/hosts
+      ansible.builtin.lineinfile:
+        path: /etc/hosts
+        regexp: "rpi$"
+        line: "{{OVPN_IP_PREFIX}}.2 {{RPI_NAME}}"
+        owner: root
+        group: root
+        mode: "0644"
+
+    - name: generate ssh key
+      ansible.builtin.command: 'ssh-keygen -t ed25519 -b 4096 -C "{{RPI_NAME}}-backup" -f /root/.ssh/{{RPI_NAME}}-backup -N ""'
+      args:
+        creates: "/root/.ssh/{{RPI_NAME}}-backup"
+
+    - name: Create ssh config for rpi
+      blockinfile:
+        path: /root/.ssh/config
+        backup: yes
+        create: yes
+        block: |
+          Host {{RPI_NAME}}
+            User {{SERVER_NAME}}-backup
+            IdentityFile /root/.ssh/{{RPI_NAME}}-backup
+
+    - name: download the public key of the server
+      ansible.builtin.fetch:
+        src: /root/.ssh/{{RPI_NAME}}-backup.pub
+        dest: /tmp/{{RPI_NAME}}-backup.pub
+        flat: yes
+    - name: create backup password
+      ansible.builtin.command: dd if=/dev/urandom of=/backup-pwd bs=1 count=52
+      args:
+        creates: /backup-pwd
+
+    - shell: base64 < /backup-pwd
+      register: shell_result
+
+    - debug: msg="{{shell_result.stdout_lines}}"
+
+    - name: Remind to backup the key
+      pause:
+        prompt: ZAPISZ TEN KLUCZ W MANADŻERZE HASEŁ ☝ i wciśnij ENTER
+
+    # - name: initiate restic reposiotory
+    #   command: restic init --password-file=/backup-pwd -r sftp:{{SERVER_NAME}}-backup@{{RPI_NAME}}:data
+    #   run_once: true
+    - name: Create the backup script
+      ansible.builtin.template:
+        src: "backup.sh.j2"
+        dest: /root/backup.sh
+        mode: u+rwx
+        backup: yes
+
+    - name: setup CRON
+      ansible.builtin.cron:
+        name: "nightly backup for {{SERVER_NAME}}_{{RPI_NAME}}"
+        minute: 15
+        hour: 4
+        job: "/root/backup.sh"
+
+- hosts: rpi
+  become: yes
+  become_user: root
+
+  tasks:
+    - name: Upload /tmp/{{RPI_NAME}}.key to rpi:/etc/openvpn/client/{{SERVER_NAME}}.key
+      ansible.builtin.copy:
+        src: /tmp/{{RPI_NAME}}.key
+        dest: /etc/openvpn/client/{{SERVER_NAME}}.key
+    - name: Create ovpn config
+      ansible.builtin.template:
+        src: "ovpn-client.conf.j2"
+        dest: /etc/openvpn/client/{{SERVER_NAME}}.conf
+    - name: start ovpn client
+      ansible.builtin.service:
+        name: openvpn-client@{{SERVER_NAME}}
+        state: restarted
+        enabled: yes
+    - name: Add the backup user
+      ansible.builtin.user:
+        name: "{{SERVER_NAME}}-backup"
+
+    - name: set permissions on backup dir
+      file:
+        path: "{{RPI_BACKUP_DIR}}/{{SERVER_NAME}}-backup"
+        owner: root
+        group: root
+        mode: 0755
+        state: directory
+    - name: set permissions on backup data dir
+      file:
+        path: "{{RPI_BACKUP_DIR}}/{{SERVER_NAME}}-backup/data"
+        owner: "{{SERVER_NAME}}-backup"
+        group: "{{SERVER_NAME}}-backup"
+        mode: 0755
+        state: directory
+    - name: auth the backup user with the public key
+      ansible.builtin.lineinfile:
+        path: /home/{{SERVER_NAME}}-backup/.ssh/authorized_keys
+        line: "{{lookup('file', '/tmp/{{RPI_NAME}}-backup.pub')}}"
+        owner: "{{SERVER_NAME}}-backup"
+        group: "{{SERVER_NAME}}-backup"
+        mode: "0600"
+        create: yes
+    - name: Create ssh config for the backup user
+      blockinfile:
+        path: /etc/ssh/sshd_config
+        backup: yes
+        create: yes
+        block: |
+          Match User {{SERVER_NAME}}-backup
+            ForceCommand internal-sftp
+            PasswordAuthentication yes
+            ChrootDirectory {{RPI_BACKUP_DIR}}/{{SERVER_NAME}}-backup
+            PermitTunnel no
+            AllowAgentForwarding no
+            AllowTcpForwarding no
+            X11Forwarding no
+    - name: restart sshd
+      ansible.builtin.service:
+        name: ssh
+        state: restarted
+        enabled: yes
diff --git a/templates/backup.sh.j2 b/templates/backup.sh.j2
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+++ b/templates/backup.sh.j2
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+#!/bin/bash
+
+REPO=sftp:{{SERVER_NAME}}-backup@{{RPI_NAME}}:data
+PWD_FILE=/backup-pwd
+RESTIC=/usr/bin/restic
+
+echo "Removing current backups..."
+rm -fr /backup/*
+
+mkdir -p /backup
+
+####### Prepare data
+
+# tutaj wpychamy dane do zbackupowania do /backup.
+# nie musimy ich tu wpychać, jeżeli po prostu są na dysku - wystarczy podać je jako argument do pierwszej komendy w sekcji "Send Backups".
+# do /backup najlepiej wgrać artefakty, które nie są aktualnie w backupowalnej postaci na dysku, np. dumpy mysql
+
+# przykłady skryptów backupujących dodałem na końcu, w sekcji "bonusy"
+
+###### Send backups
+
+echo "Sending the backup to the destination..."
+
+# podaj tutaj listę katalogów do zbackupowania. Warto backupować katalog `/etc`.
+$RESTIC -r "$REPO"  --password-file=$PWD_FILE backup /backup /etc /var/phabricator-files /etc/nginx/sites  # ... + inne pliki / katalogi
+
+echo "Pruning the backup on the destination..."
+# poniższa konfiguracja będzie trzymała backupy z każdego z pięciu ostatnich dni, po jednym backupie dla każdego z ostatnich 10 tygodni, po jednym dla ostatnich 12 miesięcy i po jednym dla ostatnich 100 lat.
+
+$RESTIC -r "$REPO"  --password-file=$PWD_FILE forget --prune  --keep-daily 5 --keep-weekly 10 --keep-monthly 12 --keep-yearly 100
diff --git a/templates/ovpn-client.conf.j2 b/templates/ovpn-client.conf.j2
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+remote {{SERVER_FQDN}}
+dev tun
+ifconfig {{OVPN_IP_PREFIX}}.2 {{OVPN_IP_PREFIX}}.1
+secret {{SERVER_NAME}}.key
+keepalive 10 60
+ping-timer-rem
+persist-tun
+persist-key
+log-append /var/log/openvpn-{{SERVER_NAME}}.log
diff --git a/templates/ovpn-server.conf.j2 b/templates/ovpn-server.conf.j2
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+++ b/templates/ovpn-server.conf.j2
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+dev tun
+ifconfig {{OVPN_IP_PREFIX}}.1 {{OVPN_IP_PREFIX}}.2
+secret {{RPI_NAME}}.key
+keepalive 10 60
+ping-timer-rem
+persist-tun
+persist-key
+log-append /var/log/openvpn-{{RPI_NAME}}.log
diff --git a/templates/server-ssh-config.j2 b/templates/server-ssh-config.j2
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+++ b/templates/server-ssh-config.j2
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+Host {{RPI_NAME}}
+    User {{SERVER_NAME}}-backup
+    IdentityFile /root/.ssh/{{RPI_NAME}}-backup