Create postgresql backups without intermediate files

roles/backups/docker/Dockerfile

@@ -1,2 +1,3 @@
 FROM restic/restic:0.17.3
 RUN apk add postgresql16-client
+WORKDIR /data

roles/backups/tasks/main.yml

@@ -5,23 +5,6 @@
     dest: /root/.pgpass
     mode: "0600"
     owner: root
-- name: Create postgresql backups volume
-  become: true
-  community.docker.docker_volume:
-    name: postgresql-backups
-- name: Run postgresql backuper
-  become: true
-  community.docker.docker_container:
-    name: postgresql-backuper-1
-    image: git.comfycamp.space/lumin/postgres:16.4-bookworm
-    entrypoint: ["sleep"]
-    command: ["infinity"]
-    volumes:
-      - postgresql-backups:/backups
-      - /root/.pgpass:/root/.pgpass:ro
-    networks:
-      - name: postgresql
-    restart_policy: unless-stopped
 - name: Run backup container
   become: true
   community.docker.docker_container:
@@ -33,9 +16,12 @@
       AWS_SECRET_ACCESS_KEY: "{{ s3_secret_access_key }}"
       AWS_DEFAULT_REGION: "{{ s3_region }}"
       RESTIC_PASSWORD: "{{ restic_password }}"
+    networks:
+      - name: postgresql
     entrypoint: ["sleep"]
     command: ["infinity"]
     volumes:
+      - /root/.pgpass:/root/.pgpass:ro
       - /mnt/hdd/archivebox-data:/data/archivebox:ro
       - archivebox:/data/docker/archivebox:ro
       - authentik-redis:/data/docker/authentik-redis:ro
@@ -68,7 +54,6 @@
       - peertube-redis:/data/docker/peertube-redis:ro
       - /mnt/hdd/peertube:/data/peertube:ro
       - phoenix:/data/docker/phoenix:ro
-      - postgresql-backups:/data/postgresql:ro
       - prosody:/data/docker/prosody:ro
       - synapse:/data/docker/synapse:ro
       - vaultwarden:/data/docker/vaultwarden:ro

roles/backups/templates/backup.sh.j2

@@ -2,7 +2,8 @@
 
 set -e
 
-docker exec postgresql-backuper-1 pg_dumpall -U postgres -h postgresql --no-password -f /backups/postgresql.sql
-docker exec restic-1 restic --repo s3:https://{{ s3_host }}/{{ s3_bucket }} -o s3.bucket-lookup=dns backup /data/postgresql
+docker exec restic-1 restic --repo s3:https://{{ s3_host }}/{{ s3_bucket }} -o s3.bucket-lookup=dns \
+    backup --stdin-filename /data/postgresql.sql --stdin-from-command \
+    -- pg_dumpall -U postgres -h postgresql --no-password
 docker exec restic-1 restic --repo s3:https://{{ s3_host }}/{{ s3_bucket }} -o s3.bucket-lookup=dns backup /data/immich
 docker exec restic-1 restic --repo s3:https://{{ s3_host }}/{{ s3_bucket }} -o s3.bucket-lookup=dns forget --keep-daily 7 --keep-weekly 2