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Stream PostgreSQL backups safely to S3 #4

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ffce751
fix(postgres-backup): stream dumps to S3
Aug 31, 2026
36bf618
fix(backup): promote completed uploads
Aug 31, 2026
4d958d7
fix(checker): ignore in-progress backups
Aug 31, 2026
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44 changes: 32 additions & 12 deletions postgres-backup-s3/backup.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -78,16 +78,26 @@ echo "Starting backup at $(date -Iseconds)"

if [ "${POSTGRES_BACKUP_ALL}" == "true" ]; then
echo "Creating dump of all databases from ${POSTGRES_HOST}..."

pg_dumpall -h $POSTGRES_HOST -p $POSTGRES_PORT -U $POSTGRES_USER | gzip | gpg -c --batch --passphrase $GPG_PASSWORD -o ${DUMP_PATH}dump.sql.gz.gpg

echo "Uploading dump to $S3_BUCKET"

cat ${DUMP_PATH}dump.sql.gz.gp | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}all_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz.gpg" || exit 2
BACKUP_URI="s3://${S3_BUCKET}${S3_PREFIX}all_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz.gpg"
IN_PROGRESS_URI="${BACKUP_URI}.in-progress"
if ! pg_dumpall -h "$POSTGRES_HOST" -p "$POSTGRES_PORT" -U "$POSTGRES_USER" \
| gzip \
| gpg -c --batch --pinentry-mode loopback --passphrase "$GPG_PASSWORD" --output - \
| aws $AWS_ARGS s3 cp - "$IN_PROGRESS_URI"; then
echo "SQL backup failed; removing any partial upload"
aws $AWS_ARGS s3 rm "$IN_PROGRESS_URI" || true
exit 2
fi

echo "SQL backup uploaded successfully"
if ! aws $AWS_ARGS s3 mv "$IN_PROGRESS_URI" "$BACKUP_URI"; then
echo "SQL backup promotion failed; removing the in-progress upload"
aws $AWS_ARGS s3 rm "$IN_PROGRESS_URI" || true
exit 2
fi

rm -rf ${DUMP_PATH}dump.sql.gz
echo "SQL backup uploaded successfully"
else
OIFS="$IFS"
IFS=','
Expand All @@ -96,16 +106,26 @@ else
IFS="$OIFS"

echo "Creating dump of ${DB} database from ${POSTGRES_HOST}..."

pg_dump $POSTGRES_HOST_OPTS $DB | gzip | gpg -c --batch --passphrase $GPG_PASSWORD -o ${DUMP_PATH}dump.sql.gz.gpg

echo "Uploading dump to $S3_BUCKET"

cat ${DUMP_PATH}dump.sql.gz.gpg | aws $AWS_ARGS s3 cp - "s3://${S3_BUCKET}${S3_PREFIX}${DB}_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz.gpg" || exit 2
BACKUP_URI="s3://${S3_BUCKET}${S3_PREFIX}${DB}_$(date +"%Y-%m-%dT%H:%M:%SZ").sql.gz.gpg"
IN_PROGRESS_URI="${BACKUP_URI}.in-progress"
if ! pg_dump $POSTGRES_HOST_OPTS "$DB" \
| gzip \
| gpg -c --batch --pinentry-mode loopback --passphrase "$GPG_PASSWORD" --output - \
| aws $AWS_ARGS s3 cp - "$IN_PROGRESS_URI"; then
echo "SQL backup failed; removing any partial upload"
aws $AWS_ARGS s3 rm "$IN_PROGRESS_URI" || true
exit 2
fi

if ! aws $AWS_ARGS s3 mv "$IN_PROGRESS_URI" "$BACKUP_URI"; then
echo "SQL backup promotion failed; removing the in-progress upload"
aws $AWS_ARGS s3 rm "$IN_PROGRESS_URI" || true
exit 2
fi

echo "SQL backup uploaded successfully"

rm -rf ${DUMP_PATH}dump.sql.gz
done
fi

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2 changes: 1 addition & 1 deletion s3-lastmodified-checker/run.sh
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Expand Up @@ -32,7 +32,7 @@ export AWS_DEFAULT_REGION=$S3_REGION


# AWS CLI command to list objects in the S3 bucket sorted by modification time
latest_file=$(aws $AWS_ARGS s3api list-objects-v2 --bucket $S3_BUCKET --prefix $S3_PREFIX --query 'sort_by(Contents, &LastModified)[-1].Key' --output text)
latest_file=$(aws $AWS_ARGS s3api list-objects-v2 --bucket $S3_BUCKET --prefix $S3_PREFIX --query 'sort_by(Contents[?ends_with(Key, `.in-progress`) == `false`], &LastModified)[-1].Key' --output text)

echo $latest_file

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