Initial commit.

Dockerfile

@@ -0,0 +1,22 @@
+FROM alpine:3.4
+MAINTAINER Pau Rodriguez-Estivill "prodrigestivill@gmail.com"
+
+ADD install.sh install.sh
+RUN sh install.sh && rm install.sh
+
+ENV POSTGRES_DATABASE **None**
+ENV POSTGRES_HOST **None**
+ENV POSTGRES_PORT 5432
+ENV POSTGRES_USER **None**
+ENV POSTGRES_PASSWORD **None**
+ENV POSTGRES_EXTRA_OPTS '-Z9'
+ENV SCHEDULE **None**
+ENV BACKUP_DIR '/backups'
+ENV BACKUP_KEEP_DAYS 7
+ENV BACKUP_KEEP_WEEKS 4
+ENV BACKUP_KEEP_MONTHS 6
+
+ADD run.sh run.sh
+ADD backup.sh backup.sh
+
+CMD ["sh", "run.sh"]

README.md

@@ -0,0 +1,45 @@
+# postgres-backup-local
+
+Backup PostgresSQL to local filesystem with periodic backups and rotate backups.
+Based on [schickling/postgres-backup-s3](https://hub.docker.com/r/schickling/postgres-backup-s3/).
+
+## Usage
+
+Docker:
+```sh
+$ docker run -e BACKUP_DIR=/backups -e POSTGRES_DATABASE=dbname -e POSTGRES_USER=user -e POSTGRES_PASSWORD=password -e POSTGRES_HOST=localhost schickling/postgres-backup-local
+```
+
+Docker Compose:
+```yaml
+postgres:
+  image: postgres
+  environment:
+    POSTGRES_USER: user
+    POSTGRES_PASSWORD: password
+
+pgbackups:
+  image: prodrigestivill/postgres-backup-local
+  links:
+    - postgres
+  volumes:
+    - /var/opt/pgbackups:/backups
+  environment:
+    SCHEDULE: '@daily'
+    BACKUP_DIR: /backups
+    BACKUP_KEEP_DAYS: 7
+    BACKUP_KEEP_WEEKS: 4
+    BACKUP_KEEP_MONTHS: 6
+    POSTGRES_DATABASE: dbname
+    POSTGRES_USER: user
+    POSTGRES_PASSWORD: password
+    POSTGRES_EXTRA_OPTS: '-Z9 --schema=public --blobs'
+```
+
+### Automatic Periodic Backups
+
+You can additionally set the `SCHEDULE` environment variable like `-e SCHEDULE="@daily"` to run the backup automatically.
+
+More information about the scheduling can be found [here](http://godoc.org/github.com/robfig/cron#hdr-Predefined_schedules).
+
+Folders daily, weekly and monthly are created and populated using hard links to save disk space.

backup.sh

@@ -0,0 +1,57 @@
+#! /bin/sh
+
+set -e
+set -o pipefail
+
+if [ "${POSTGRES_DATABASE}" = "**None**" ]; then
+  echo "You need to set the POSTGRES_DATABASE environment variable."
+  exit 1
+fi
+
+if [ "${POSTGRES_HOST}" = "**None**" ]; then
+  if [ -n "${POSTGRES_PORT_5432_TCP_ADDR}" ]; then
+    POSTGRES_HOST=$POSTGRES_PORT_5432_TCP_ADDR
+    POSTGRES_PORT=$POSTGRES_PORT_5432_TCP_PORT
+  else
+    echo "You need to set the POSTGRES_HOST environment variable."
+    exit 1
+  fi
+fi
+
+if [ "${POSTGRES_USER}" = "**None**" ]; then
+  echo "You need to set the POSTGRES_USER environment variable."
+  exit 1
+fi
+
+if [ "${POSTGRES_PASSWORD}" = "**None**" ]; then
+  echo "You need to set the POSTGRES_PASSWORD environment variable or link to a container named POSTGRES."
+  exit 1
+fi
+
+#Proces vars
+export PGPASSWORD=$POSTGRES_PASSWORD
+POSTGRES_HOST_OPTS="-h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER $POSTGRES_EXTRA_OPTS"
+KEEP_DAYS=$BACKUP_KEEP_DAYS
+KEEP_WEEKS=`expr $((($BACKUP_KEEP_WEEKS * 7) + 1))`
+KEEP_MONTHS=`expr $((($BACKUP_KEEP_MONTHS * 31) + 1))`
+
+#Initialize filename vers and dirs
+DFILE="$BACKUP_DIR/daily/$POSTGRES_DATABASE-`date +%Y%m%d-%H%M%S`.sql.gz"
+WFILE="$BACKUP_DIR/weekly/$POSTGRES_DATABASE-`date +%G%V`.sql.gz"
+MFILE="$BACKUP_DIR/monthly/$POSTGRES_DATABASE-`date +%Y%m`.sql.gz"
+mkdir -p "$BACKUP_DIR/daily/" "$BACKUP_DIR/weekly/" "$BACKUP_DIR/monthly/"
+
+#Create dump
+echo "Creating dump of ${POSTGRES_DATABASE} database from ${POSTGRES_HOST}..."
+pg_dump -f "$DFILE" $POSTGRES_HOST_OPTS $POSTGRES_DATABASE
+
+#Copy (hardlink) for each entry
+ln -vf "$DFILE" "$WFILE"
+ln -vf "$DFILE" "$MFILE"
+
+#Clean old files
+find "$BACKUP_DIR/daily" -maxdepth 1 -mtime +$KEEP_DAYS -name "$POSTGRES_DATABASE-*.sql*" -exec rm -rf '{}' ';'
+find "$BACKUP_DIR/weekly" -maxdepth 1 -mtime +$KEEP_WEEKS -name "$POSTGRES_DATABASE-*.sql*" -exec rm -rf '{}' ';'
+find "$BACKUP_DIR/monthly" -maxdepth 1 -mtime +$KEEP_MONTHS -name "$POSTGRES_DATABASE-*.sql*" -exec rm -rf '{}' ';'
+
+echo "SQL backup uploaded successfully"

install.sh

@@ -0,0 +1,18 @@
+#! /bin/sh
+
+# exit if a command fails
+set -e
+
+apk update
+
+# install pg_dump
+apk add postgresql
+
+# install go-cron
+apk add curl
+curl -L https://github.com/odise/go-cron/releases/download/v0.0.6/go-cron-linux.gz | zcat > /usr/local/bin/go-cron
+chmod u+x /usr/local/bin/go-cron
+apk del curl
+
+# cleanup
+rm -rf /var/cache/apk/*

run.sh

@@ -0,0 +1,9 @@
+#! /bin/sh
+
+set -e
+
+if [ "${SCHEDULE}" = "**None**" ]; then
+  sh backup.sh
+else
+  exec go-cron "$SCHEDULE" /bin/sh backup.sh
+fi