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Docker Articles
Found 111 articles
How to pass command line arguments to a python Docker container?
Before getting into the docker container arguments we must know about python command line arguments and how they are accessed by the developer. Command line arguments are of great use when we want our python script to be controlled outside of the program. Access the Python Script's Command Line Arguments Step 1: Create a Python Script main.py First, let's create a Python script that can accept and process command line arguments ? # sys will allow us to access the passed arguments import sys # sys.argv[0] access the first argument passed that is the ...
Read MorePython Library API for Docker
You can access, manage and manipulate docker objects such as containers, images, clusters, swarms, etc. using a Python library API. You can do pretty much anything that docker commands let you do. This comes very handy when you are using a python app such as Django or Flask and you want to maintain your docker container using the same python script that you use for the application. Installation To use the python library API for docker, you need to install a package called docker-py. You can do so using the following pip command. If you have python 2 installed, replace ...
Read MoreHow to Optimize Docker Performance?
Docker has revolutionized the way software is developed, deployed, and scaled. With its lightweight containers and efficient resource utilization, Docker enables faster application delivery and greater scalability. However, as your Docker-based applications grow in complexity, ensuring optimal performance becomes crucial to maintain efficiency and meet user demands. In this article, we'll explore the best practices and techniques for optimizing Docker performance. We'll delve into various factors that influence Docker's performance, such as container configuration, resource allocation, networking, storage, and monitoring. By implementing these optimization strategies, you can enhance the speed, efficiency, and scalability of your Dockerized applications. Understanding ...
Read MoreHow to Override Entrypoint Using Docker Run?
In the world of containerization, Docker has become a popular choice for packaging and deploying applications. One of the key aspects of Docker containers is the entrypoint, which defines the default command that is executed when the container starts. However, there are scenarios where you may need to override the entrypoint and execute a different command inside the container. This flexibility allows you to customize the container behavior based on your specific requirements. In this article, we will explore the concept of overriding the entrypoint using the docker run command. We will delve into the reasons why you might ...
Read MoreInstall Docker and Learn Basic Container Manipulation in CentOS and RHEL 8/7
Docker is a containerization platform that packages applications and their dependencies into lightweight, portable containers. This allows applications to run consistently across different environments, from development to production. In this article, we will guide you through installing Docker on CentOS and RHEL 8/7 and demonstrate basic container operations. Installing Docker on CentOS/RHEL 8 Preparing the System Before installing Docker, ensure your system is up to date and install required dependencies − $ sudo yum update $ sudo yum install -y yum-utils device-mapper-persistent-data lvm2 Adding Docker Repository Add the official Docker repository to ...
Read MoreTips to Manage Docker Containers Using CLI
Docker has revolutionized how we create, ship, and deploy applications through lightweight containerization. While Docker provides a graphical interface, the command-line interface (CLI) remains the most powerful tool for efficiently managing containers. This article covers essential CLI tips for Docker container management with practical examples. Installing Docker CLI Before managing Docker containers, ensure Docker CLI is installed on your system. Docker CLI is available for Windows, macOS, and Linux. Visit the official Docker website to download and install the appropriate version for your operating system. Basic Container Operations Starting and Stopping Containers Start a container ...
Read MoreRun Docker Container in Background (Detached Mode)
Docker containers can run in detached mode (background) using various methods. This allows containers to operate independently without blocking the terminal, making it ideal for running services, web applications, or long-running processes that don't require immediate interaction. Methods to Run Containers in Detached Mode Using the -d flag with docker run Using the --detach option Using Docker Compose with the -d flag Using the "-d" Flag The most common method is using the -d flag with the docker run command. This launches the container in detached mode, returning the container ID and freeing up ...
Read MoreHow to Name or Rename Docker Containers?
Docker container naming is a crucial aspect of container management that significantly improves workflow efficiency. When working with multiple containers, Docker's default random names like "clever_curie" or "admiring_feynman" can make identification and management challenging. By assigning meaningful names, you can easily identify, interact with, and organize your containers effectively. Naming Docker Containers Default Container Names When you create a Docker container without specifying a name, Docker assigns a random name consisting of an adjective and a famous scientist's surname. While creative, these names provide no context about the container's purpose, making management difficult in complex environments with ...
Read MoreDocker host network vs bridge network
Docker provides two primary single-host networking modes: host and bridge networks. Single-host networks operate locally on each individual Docker host, providing different levels of network isolation and connectivity options. In host networking, Docker containers share the host's network stack directly, eliminating network isolation between container and host. With bridge networking, containers run in an isolated network namespace and require explicit port mapping to communicate with external systems. Host Network Mode Host networking allows containers to use the host's network interface directly. This mode provides maximum performance but sacrifices network isolation. Creating a Container with Host Network ...
Read MoreHow is Docker different from a Virtual Machine?
When we speak about efficient utilization and proper allocation of computer resources, both virtual machines and Docker containers are effective in their own ways. In the past few years, Docker containers have gained tremendous popularity among organizations of all sizes. It is very important to understand the use-cases and purposes that they both serve if you want to decide which of the two is better for your requirements. However, before we start the discussion make sure that you have the basic knowledge of what Docker is. You can refer to our tutorial on Docker. So without any further ado, ...
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