Docker

When using the Docker Engine API to execute commands inside a container, some users report seeing garbage characters or random symbols appearing in the API response. These characters do not appear when the same command is executed interactively in the terminal, and they often show up inconsistently. This behavior can be confusing, but it’s actually expected under certain conditions. 1. The Issue A developer may use the Docker Exec API to run commands in containers, such as: ...

Introduction Have you encountered the “npm error Exit handler never called!” in your GitHub Action? It’s a frustrating issue that can halt your workflow execution unexpectedly. This post delves into understanding why this error occurs and how to effectively resolve it. error: ---> Running in 44d17f6484e3 npm error Exit handler never called! npm error This is an error with npm itself. Please report this error at: npm error <https://github.com/npm/cli/issues> npm error A complete log of this run can be found in: /root/.npm/_logs/2025-10-18T04_48_30_916Z-debug-0.log The command '/bin/sh -c npm ci' returned a non-zero code: 1 ...

If you build your own container manage system when integrating docker client library, you may also encounter issues with credential resolution. If you system maintain the registry credential, it is easy to assume that authentication will “just work” once credentials are configured in your platform. But behind the scenes, Docker follows a specific and sometimes confusing logic for how it locates and uses credentials. This post explains that behavior in depth and highlights one of the most common causes of authentication issues developers face when using the Docker client as part of a backend or automation workflow. ...

Understanding the Error and Why It Occurs The message Please use the command-line updater because updating via browser is disabled in your config.php means NextCloud’s configuration file (config.php) is set to restrict browser-based updates. This is a security measure designed to prevent unauthorized or potentially malicious updates. Docker setups often implement this for added security. Step-by-Step Instructions 1. Access Your Docker Container First, you need to access your NextCloud Docker container’s shell. Let’s assume your NextCloud container is named nextcloud. Replace nextcloud with the actual name of your container. ...

Setting up a self-hosted GitHub Runner on a DigitalOcean droplet allows for more control and customization in your CI/CD pipelines. This guide walks you through creating a droplet using a Docker image, configuring GitHub secrets, and setting up a self-hosted runner in a few easy steps. 1. Setup DigitalOcean Droplet 1.1 Create a DigitalOcean Droplet Start by creating a droplet from the DockerImage marketplace on DigitalOcean. This pre-configured image includes Docker, so you won’t need to install it yourself. ...

Problem When self-hosting Seatable using Docker, you might experience issues with your SMTP setup, even if you’re confident that your configuration is correct because it works on another platform. This might appear to be a bug, but there is a specific cause. Recently, a friend encountered this problem, and I was able to identify the root cause. Root Cause Seatable does not automatically refresh its email configuration from Docker Compose environment variables after the initial setup. ...

The Problem I’m building a container management tool using the Docker Compose SDK (link) and the Docker CLI library (link). One feature is the ability to deploy Docker Compose YAML files that reference images from private registries. To handle authentication, I added private registry credentials into my tool and injected them into the Docker client using the authConfig field during Compose service initialization. I expected Docker Compose to use these credentials when pulling images. ...

If you’ve ever worked with Docker Compose and encountered a situation where your container suddenly can’t see any files in a previously working mounted folder, you’re not alone. This issue can be especially frustrating when everything seems to work fine on the initial deployment, only to break inexplicably after redeploy. The Problem When a folder is bind-mounted into a Docker container using Docker Compose, it works correctly during the initial deployment. However, after a redeploy — particularly when triggered by automation tools like Portainer — the mounted folder inside the container becomes empty. ...

When managing services in Docker Swarm mode, the --prune flag in docker stack deploy helps keep your stack synchronized with your compose file. It ensures that only the services defined in your current file remain running, and anything outdated is automatically cleaned up. What the --prune Flag Does When you run this command: docker stack deploy -c docker-compose.yml mystack --prune Docker compares your current stack with the new compose file and performs three actions: ...

1. Introduction In this tutorial, we will walk through the steps to create a local Kubernetes cluster with TLS certificates configured. This setup ensures secure communication between your Kubernetes components. 2. Prerequisites Docker installed on your local machine kubectl installed kind installed OpenSSL installed for generating TLS certificates 3. Install kubectl (Ubuntu) curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl" chmod +x kubectl sudo mv kubectl /usr/local/bin/ Verify the Installation You can verify the installation by running the following command: ...