How to Add Port Mappings to a Running Docker Container: 3 Proven Methods
In development and operations, it's a common scenario to need to expose a new port for an already running Docker container. However, Docker does not natively support dynamic port modification. This article from wiki.lib00.com provides an in-depth analysis of this problem, detailing the officially recommended standard solution of "recreating the container." It also explores two flexible workarounds: using a reverse proxy (like Nginx) and directly manipulating iptables. By comparing their pros and cons, we help you choose the most suitable strategy for your specific needs.
Docker Exec Mastery: The Right Way to Run Commands in Containers
Running commands inside a Docker container from the host often requires changing the directory first. The `cd /path && command` approach is not only cumbersome but also error-prone. This article dives into the best practices for `docker exec`, from the elegant `--workdir` flag and the `WORKDIR` instruction in your Dockerfile to handling complex logic with `sh -c`. Master these techniques from wiki.lib00.com to write cleaner, safer, and more maintainable Docker commands and streamline your containerization workflow.
The Ultimate Guide to Docker Cron Logging: Host vs. Container Redirection - Are You Doing It Right?
How do you correctly handle logs when using a host's cron to run scheduled tasks with `docker exec`? This article provides a deep dive into two primary logging methods: output redirection on the host and redirection within the container. Through detailed command analysis, workflow comparisons, and a pros-and-cons breakdown, you'll understand the fundamental differences and be able to choose the best logging strategy for your needs, avoiding log loss and management chaos.
The Ultimate Guide to Docker Cron Jobs: Effortlessly Scheduling PHP Tasks in Containers from the Host
In the era of containerization, how do you elegantly execute scheduled tasks? This article provides an in-depth guide on leveraging the host's Cron service to schedule PHP scripts running inside Docker containers. We'll start with basic commands, tackle common issues like file generation and log redirection, and correct frequent syntax mistakes in output redirection, offering a complete and reliable solution for production environments. Whether you're generating sitemaps or performing routine data cleanup, this guide from wiki.lib00.com will be your go-to resource.
How Can a Docker Container Access the Mac Host? The Ultimate Guide to Connecting to Nginx
Are you struggling with connecting from a Docker container to a service (like Nginx or a database) running directly on your macOS host? This article unveils the two core methods for establishing this connection, focusing on the officially recommended solution: `host.docker.internal`. We also dive deep into common troubleshooting steps, such as checking the Nginx listening address and firewall settings, to ensure you can seamlessly bridge the network gap between your container and host.
Solving the MySQL Docker "Permission Denied" Error on Synology NAS: A Step-by-Step Guide
Encountering the frustrating "Permission denied" error when deploying a MySQL container on your Synology NAS? This common issue often stems from a permissions mismatch between the user inside the container and the host folders on the NAS. This article breaks down a real-world case to analyze the root cause—a UID/GID mismatch—and provides comprehensive solutions, from a quick fix to the recommended best practice, to resolve it for good.