Add a basic script to make a database backup

Also a playbook to download the backup files.

It's crude, but in this case something is better than nothing.

.gitignore

@@ -11,3 +11,4 @@ rails/config/master.key
 certs
 etc/build-info.txt
 etc/certbot-dns-user-credentials.yml
+backups

Makefile

@@ -116,5 +116,12 @@ deploy-certs:
 deploy-app:
 	$(PLAY) -v ansible/deploy.yml --tags=app
 
+deploy-scripts:
+	$(PLAY) -v ansible/deploy.yml --tags=scripts
+
+deploy-backup:
+	mkdir -p backups
+	$(PLAY) -v ansible/backup.yml
+
 deploy-ssh:
 	@ssh fedora@tiddlyhost.com

ansible/backup.yml

@@ -0,0 +1,31 @@
+
+- hosts: all
+  become: yes
+  become_user: root
+
+  vars:
+    local_backup_dir: ../backups
+
+  tasks:
+  - name: Make a fresh backup of the database
+    command: "{{ bin_dir }}/db-backup"
+
+  - name: Download all the files
+    # Beware it will overwrite existing files
+    # TODO: Timestamps maybe?
+    fetch:
+      src: "{{ item }}"
+      dest: "{{ local_backup_dir }}/"
+      flat: yes
+      fail_on_missing: no
+    with_items:
+    - "{{ db_dump_file }}"
+    - "{{ db_dump_file }}.1"
+    - "{{ db_dump_file }}.2"
+    - "{{ db_dump_file }}.3"
+    - "{{ db_dump_file }}.4"
+    - "{{ db_dump_file }}.5"
+    - "{{ db_dump_file }}.6"
+    - "{{ db_dump_file }}.7"
+    - "{{ db_dump_file }}.8"
+    - "{{ db_dump_file }}.9"

ansible/deploy.yml

@@ -4,16 +4,16 @@
   become_user: root
 
   vars:
-  - home_dir: /home/{{ ansible_user }}
-    root_home_dir: /root
-
     certbot_dns_credentials: ../etc/certbot-dns-user-credentials.yml
     docker_compose_file: ../docker-compose-prod.yml
 
     cert_host: tiddlyhost.com
     letsencrypt_dir: /etc/letsencrypt/live/{{ cert_host }}
     certs_dir: "{{ home_dir }}/certs"
 
+    db_name: app_production
+    db_user: postgres
+
   tasks:
 
   - name: Add repo for docker-ce
@@ -137,3 +137,20 @@
     command:
       cmd: docker-compose rm
     tags: app
+
+  - name: Create bin dir
+    become: no
+    file:
+      path: "{{ bin_dir }}"
+      state: directory
+    tags: scripts
+
+  - name: Copy up some scripts
+    become: no
+    template:
+      src: templates/{{ item }}.j2
+      dest: "{{ bin_dir }}/{{ item }}"
+      mode: "0755"
+    with_items:
+    - db-backup
+    tags: scripts

ansible/inventory.yml

@@ -2,3 +2,10 @@ all:
   hosts:
     tiddlyhost.com:
       ansible_user: fedora
+
+  vars:
+    root_home_dir: /root
+    home_dir: /home/{{ ansible_user }}
+    bin_dir: "{{ home_dir }}/bin"
+    backups_dir: "{{ home_dir }}/backups"
+    db_dump_file: "{{ backups_dir }}/dbdump.gz"

ansible/templates/db-backup.j2

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+mkdir -p {{ backups_dir }}
+
+# Keep a few old backups
+for i in {8..0}; do
+  [[ -f {{ db_dump_file }}.$i ]] && mv {{ db_dump_file }}.$i {{ db_dump_file }}.$((i+1))
+done
+mv {{ db_dump_file }} {{ db_dump_file }}.0
+
+# Make a new backup
+sudo docker-compose exec db bash -c \
+  'pg_dump --dbname={{ db_name }} --username={{ db_user }}' | gzip > {{ db_dump_file }}