From 64f5d0f82a916e739c778c387b1dae725f4c18ef Mon Sep 17 00:00:00 2001
From: Adar Nimrod <nimrod@shore.co.il>
Date: Fri, 15 Dec 2023 20:07:06 +0200
Subject: [PATCH] Postgres: Backup and restore scripts.
---
postgres/Dockerfile | 2 +-
postgres/README.md | 24 ++++++++++++++++++++++++
postgres/backup | 6 ++++++
postgres/restore | 6 ++++++
4 files changed, 37 insertions(+), 1 deletion(-)
create mode 100755 postgres/backup
create mode 100755 postgres/restore
diff --git a/postgres/Dockerfile b/postgres/Dockerfile
index f85f511..3a93669 100644
--- a/postgres/Dockerfile
+++ b/postgres/Dockerfile
@@ -1,3 +1,3 @@
FROM docker.io/postgres:16.1-alpine3.19
-COPY --chown=root:root healthcheck /usr/local/bin/
+COPY --chown=root:root healthcheck backup restore /usr/local/bin/
HEALTHCHECK --start-period=3m CMD healthcheck
diff --git a/postgres/README.md b/postgres/README.md
index 42e8063..0aefb52 100644
--- a/postgres/README.md
+++ b/postgres/README.md
@@ -1,3 +1,27 @@
# postgres
Just the upstream image but with a healthcheck.
+
+## Backups
+
+The image includes a `backup` and `restore` scripts. The `backup` scripts dumps
+all of the databases using `pg_dumpall` and compresses the output using `zstd`
+to stdout. This is meant so that backups are run by an external process and it
+saves the output to a file, for example:
+
+```
+docker exec pg1 backup > /var/backups/pg1/dump.sql.zstd
+```
+
+The `restore` script matches the `backup` script in that the it reads a zstd
+compress SQL dump from stdin. An example restore:
+
+```
+cat dump.sql.zstd | docker exec -i pg2 restore
+```
+
+In fact you're able to migrate data from 1 instance to another like so:
+
+```
+docker exec pg1 backup | docker exec -i pg2 restore
+```
diff --git a/postgres/backup b/postgres/backup
new file mode 100755
index 0000000..44099e8
--- /dev/null
+++ b/postgres/backup
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export PGUSER="${POSTGRES_USER:-postgres}"
+
+pg_dumpall | zstd
diff --git a/postgres/restore b/postgres/restore
new file mode 100755
index 0000000..5aefec2
--- /dev/null
+++ b/postgres/restore
@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+export PGUSER="${POSTGRES_USER:-postgres}"
+
+zstd --decompress - | psql
--
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