dosubot[bot]
commented
1 month ago @GangLiCN Hello there! I'm here to assist you with any bugs, questions, or contributions. Let's tackle this issue together while we wait for a human maintainer.
To ensure that the PostgreSQL database used by the dify_db container starts correctly after a physical box restart or shutdown, you can use the restart: always policy in your Docker Compose configuration. This policy ensures that the container will always restart if it stops, including after a system reboot.
Here is the relevant part of your docker-compose.yaml:
services:
pgvecto-rs:
image: tensorchord/pgvecto-rs:pg16-v0.2.0
restart: always
environment:
PGUSER: postgres
POSTGRES_PASSWORD: difyai123456
POSTGRES_DB: dify
PGDATA: /var/lib/postgresql/data/pgdata
volumes:
- ./volumes/pgvectors/data:/var/lib/postgresql/data
ports:
- "5431:5432"
healthcheck:
test: [ "CMD", "pg_isready" ]
interval: 1s
timeout: 3s
retries: 30For best practices in backup and recovery in a Docker or Kubernetes environment, you should:
-
Regular Backups: Schedule regular backups of your PostgreSQL database. You can use tools like
pg_dumpfor logical backups orpg_basebackupfor physical backups. -
Volume Mounts: Ensure that your PostgreSQL data is stored in a Docker volume or a persistent volume in Kubernetes. This allows the data to persist even if the container is destroyed.
-
Automated Backup Scripts: Create automated scripts to back up your data and store it in a secure location, such as an S3 bucket or another cloud storage service.
-
Disaster Recovery Plan: Have a disaster recovery plan in place that includes steps to restore your database from backups.
-
Health Checks: Use health checks to monitor the status of your PostgreSQL container and ensure it is running correctly.
Here is an example of how you might set up a backup script in a Docker environment:
#!/bin/bash
# Define backup directory and filename
BACKUP_DIR=/path/to/backup/dir
BACKUP_FILE=$BACKUP_DIR/backup_$(date +%Y%m%d%H%M%S).sql
# Run pg_dump to create a backup
docker exec -t dify_db pg_dumpall -c -U postgres > $BACKUP_FILE
# Optional: Upload the backup to S3
aws s3 cp $BACKUP_FILE s3://your-bucket-name/$(basename $BACKUP_FILE)In a Kubernetes environment, you can use CronJobs to schedule backups:
apiVersion: batch/v1beta1
kind: CronJob
metadata:
name: postgres-backup
spec:
schedule: "0 2 * * *" # Every day at 2 AM
jobTemplate:
spec:
template:
spec:
containers:
- name: postgres-backup
image: postgres:15-alpine
env:
- name: PGUSER
value: "postgres"
- name: PGPASSWORD
value: "difyai123456"
command: ["/bin/sh", "-c", "pg_dumpall -c -U $PGUSER > /backup/backup_$(date +%Y%m%d%H%M%S).sql"]
volumeMounts:
- name: backup-volume
mountPath: /backup
restartPolicy: OnFailure
volumes:
- name: backup-volume
persistentVolumeClaim:
claimName: your-pvc-nameBy following these practices, you can ensure that your PostgreSQL database is resilient and can be recovered in case of failures [1][2][3][4].
To continue talking to Dosu, mention @dosu.
GangLiCN
crazywoola
kurokobo
Self Checks
Dify version
0.8.3
Cloud or Self Hosted
Self Hosted (Docker)
Steps to reproduce
Issue:
I have a local dify web app running on windows based VM instance(Ubuntu 22.04 for WSL2), Unfortunately this env is not ready after the VM box restarts(because Host laptop shuts down every day)
Error logs: From the output of "docker-compose logs", it appears that postgreSQL database fails to start up due to invalid checkpoint record .
Analysis: It looks that this is caused by pgdb's abnormal shutdown. But I can't find any official document talking about this. So, Does it mean " User must shutdown database(for container "dify_db" usage) normally and do a full backup in case the database may not start up correctly " ?
✔️ Expected Behavior
Better pg database backup and recovery strategy especically for docker or k8s env.
❌ Actual Behavior
you have a full database backup or have correct and complete WAL log files for recovery.