Should each service have its own database instance or share one?
I'm new to Docker and using it to learn and experiment. I currently have two services sharing a PostgreSQL container, with an initial migration that creates a separate…
Docker containers
What Are Good Alternatives to Cloud Hosting for Dockerized Apps?
I want to host a website, a private Git service, and a ticketing system using Docker. I've tried several major cloud providers, but I've found some of them…
My ROS2 Docker Container Disappeared After a Month—What Happened?
I'm using a Raspberry Pi 4B with a container based on a ROS2 image. I took about a month away from programming while working on a Pi-based NAS,…
Are These Duplicate Docker Images Safe to Delete?
While checking my Docker images through UGOS, I noticed several entries that appear to be duplicates. The green image is currently running, the gray image seems to be…
Are Old or Duplicate Docker Images Safe to Delete?
I was checking my Docker images in UGOS/Ugreen while doing routine updates and noticed several apparent duplicates. One image is currently running, another looks like the previous version,…
How can I let a Dockerized n8n workflow access files from my computer?
I'm running n8n locally inside Docker and using a Read from Disk node to load files such as an .xlsx spreadsheet and a PDF. The node keeps returning…
How Much Linux Do I Need to Know Before Learning Docker?
I want to start learning Docker, but I have very little Linux experience. Will that make Docker significantly harder to learn, or can I get started while learning…
Docker Containers Are Running but Web Access Returns 502 or Fails Completely
I have a Docker Compose setup on Ubuntu 26.04 that worked normally for almost a year. Yesterday, most of the client-facing containers suddenly became inaccessible—around 24 out of…
Firewalld Gateway Policy Isn’t Forwarding Ports to My VM
I'm setting up an AlmaLinux machine as a router using firewalld's gateway policy configuration. The basic filtering works as expected: incoming traffic is denied by default while permitted…
Should I Stop Docker Containers Before Updating the Host OS?
I run several Docker containers in a small home lab and previously wrote a manually triggered script that stopped them before updating the host operating system, then started…
What’s the best way to schedule PostgreSQL backups with Docker?
I'm running PostgreSQL in a Docker container and want to create regular automated backups. Should I run cron inside the database container, use docker exec from the host,…
What’s the best way to find and safely edit a configuration file inside a container?
I'm running an application from a container image, and the image includes a configuration file that is normally updated through the application's settings screen. There appears to be…