{"id":3210,"date":"2018-12-30T10:33:18","date_gmt":"2018-12-30T05:03:18","guid":{"rendered":"https:\/\/pheonixsolutions.com\/blog\/?p=3210"},"modified":"2026-10-03T10:29:50","modified_gmt":"2026-10-03T04:59:50","slug":"docker-images-and-containers-guide","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/docker-images-and-containers-guide\/","title":{"rendered":"Complete Docker Images and Containers Guide for Beginners (2026)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Post Date:<\/strong> December 28, 2018<br><strong>Last Updated:<\/strong> October 03, 2026<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Docker Images and Containers are the foundation of modern application deployment and DevOps practices. Organizations today need applications to run consistently across development, testing, staging, and production environments. One of the biggest challenges in software deployment is ensuring that applications behave the same way regardless of where they are executed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Docker solves this problem through containerization.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Docker is an open-source platform that enables developers and system administrators to package applications and all their dependencies into lightweight, portable containers. These containers can run reliably on any system with Docker installed, making deployments faster, more consistent, and easier to manage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this guide, you will learn Docker Images and Containers, how they work, how to pull images from Docker Hub, create containers, access running containers, and manage them efficiently.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Table of Contents<\/h2>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>What are Docker Images and Containers?<\/li>\n\n\n\n<li>What is Docker?<\/li>\n\n\n\n<li>What is a Docker Container?<\/li>\n\n\n\n<li>Benefits of Docker<\/li>\n\n\n\n<li>Prerequisites<\/li>\n\n\n\n<li>Creating Docker Images and Containers<\/li>\n\n\n\n<li>Useful Docker Commands<\/li>\n\n\n\n<li>Docker Images vs Containers<\/li>\n\n\n\n<li>Benefits of Containerization<\/li>\n\n\n\n<li>Frequently Asked Questions<\/li>\n\n\n\n<li>Conclusion<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What are Docker Images and Containers?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Docker Images and Containers work together to provide a portable and consistent application runtime environment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Docker Image is a read-only template containing application code, libraries, dependencies, configuration files, and runtime components.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A Docker Container is a running instance of a Docker image.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Think of it this way:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Docker Image = Blueprint<\/li>\n\n\n\n<li>Docker Container = Running Building<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Multiple containers can be created from the same Docker image.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Docker Images and Containers Architecture<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Docker Image\n     \u2502\n     \u25bc\nDocker Container\n     \u2502\n     \u25bc\nRunning Application<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What is Docker?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Docker is a containerization platform that packages an application along with its dependencies, libraries, configuration files, and runtime environment into a single unit called a container.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Using Docker Images and Containers ensures applications run consistently across multiple environments without compatibility issues.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Benefits of Docker<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faster application deployment<\/li>\n\n\n\n<li>Environment consistency<\/li>\n\n\n\n<li>Lightweight resource usage<\/li>\n\n\n\n<li>Easy scalability<\/li>\n\n\n\n<li>Simplified dependency management<\/li>\n\n\n\n<li>Improved DevOps workflows<\/li>\n\n\n\n<li>Better CI\/CD integration<\/li>\n\n\n\n<li>Reduced infrastructure overhead<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Docker provides an excellent and efficient way to deploy applications consistently across environments.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">What is a Docker Container?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A Docker Container is a lightweight, standalone, executable package that contains everything required to run an application.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Containers can be created, stopped, restarted, and removed whenever needed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Examples include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ubuntu Container<\/li>\n\n\n\n<li>CentOS Container<\/li>\n\n\n\n<li>Nginx Container<\/li>\n\n\n\n<li>Apache Container<\/li>\n\n\n\n<li>MySQL Container<\/li>\n\n\n\n<li>PostgreSQL Container<\/li>\n\n\n\n<li>PHP Application Container<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Unlike traditional virtual machines, Docker containers share the host operating system kernel, making them significantly faster and more resource-efficient.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Why Use Docker Images and Containers?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Organizations worldwide use Docker Images and Containers because they provide:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Portability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Run applications anywhere without changing configurations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Consistency<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Applications behave identically across development, testing, and production environments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Faster Deployment<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Containers start within seconds compared to traditional virtual machines.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Scalability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Scale applications horizontally with minimal effort.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Isolation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Applications run independently without affecting each other.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Resource Efficiency<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Containers consume fewer resources than virtual machines.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Prerequisites<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before creating Docker Images and Containers, ensure Docker is installed and running on your system.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Install Docker<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Refer to our installation guide:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pheonixsolutions.com\/blog\/how-to-install-docker-in-centos-7\/?utm_source=chatgpt.com\">How to Install Docker in CentOS 7<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Verify Available Disk Space<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">df -h<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">Filesystem      Size  Used Avail Use% Mounted on\n\/dev\/xvda1       50G   12G   36G  25% \/<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Verify Docker Service Status<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker ps<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">CONTAINER ID   IMAGE   COMMAND   CREATED   STATUS   PORTS   NAMES<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Creating Docker Images and Containers<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Pull a CentOS Docker Image<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker pull centos:latest<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">latest: Pulling from library\/centos\na02a4930cb5d: Pull complete\nStatus: Downloaded newer image for centos:latest<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Verify Downloaded Docker Images<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker images<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">REPOSITORY   TAG      IMAGE ID       SIZE\ncentos       latest   1e1148e4cc2c   202MB<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Pull an Ubuntu Docker Image<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker pull ubuntu:latest<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">latest: Pulling from library\/ubuntu\nStatus: Downloaded newer image for ubuntu:latest<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Verify Available Docker Images<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker images<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">REPOSITORY   TAG      IMAGE ID       SIZE\ncentos       latest   1e1148e4cc2c   202MB\nubuntu       latest   93fd78260bd1   86.2MB<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5: Create a CentOS Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker run -itd --name=xyz centos:latest \/bin\/bash<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">667db752093100944df883d799a8d4f09564669f061362e614364d4a319e8529<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Command Explanation<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Option<\/th><th>Description<\/th><\/tr><\/thead><tbody><tr><td>docker run<\/td><td>Create and start container<\/td><\/tr><tr><td>-i<\/td><td>Interactive mode<\/td><\/tr><tr><td>-t<\/td><td>Allocate terminal<\/td><\/tr><tr><td>-d<\/td><td>Detached mode<\/td><\/tr><tr><td>&#8211;name<\/td><td>Assign custom name<\/td><\/tr><tr><td>\/bin\/bash<\/td><td>Launch Bash shell<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 6: Verify Running Containers<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker ps<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">CONTAINER ID   IMAGE           COMMAND       STATUS       NAMES\n667db7520931   centos:latest   \"\/bin\/bash\"   Up 9 sec     xyz<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 7: Create an Ubuntu Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker run -itd --name=abc ubuntu:latest \/bin\/bash<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 8: Verify All Running Containers<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker ps<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">CONTAINER ID   IMAGE           COMMAND       STATUS       NAMES\n95dad75e0c6c   ubuntu:latest   \"\/bin\/bash\"   Up 4 sec     abc\n667db7520931   centos:latest   \"\/bin\/bash\"   Up 57 sec    xyz<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 9: Access the CentOS Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker exec -it xyz \/bin\/bash<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 10: Verify Operating System Details<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">cat \/etc\/os-release<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">NAME=\"CentOS Linux\"\nVERSION=\"7 (Core)\"\nID=\"centos\"\nVERSION_ID=\"7\"<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 11: Exit the Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">exit<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Verify running containers:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker ps<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 12: Access Ubuntu Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker exec -it abc \/bin\/bash<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 13: Verify Ubuntu Version<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">cat \/etc\/os-release<\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Sample Output:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">NAME=\"Ubuntu\"\nVERSION=\"18.04.1 LTS (Bionic Beaver)\"<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Step 14: Exit Ubuntu Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">exit<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Useful Docker Commands<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">View Running Containers<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker ps<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">View All Containers<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker ps -a<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Stop a Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker stop xyz<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Start a Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker start xyz<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Restart a Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker restart xyz<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Remove a Container<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker rm xyz<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Remove an Image<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker rmi ubuntu<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">View Docker Version<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker version<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">View Docker Information<\/h3>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">docker info<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Docker Images vs Containers<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Feature<\/th><th>Docker Image<\/th><th>Docker Container<\/th><\/tr><\/thead><tbody><tr><td>Type<\/td><td>Template<\/td><td>Running Instance<\/td><\/tr><tr><td>State<\/td><td>Static<\/td><td>Dynamic<\/td><\/tr><tr><td>Storage<\/td><td>Stored on Disk<\/td><td>Runs in Memory<\/td><\/tr><tr><td>Editable<\/td><td>No<\/td><td>Yes<\/td><\/tr><tr><td>Purpose<\/td><td>Create Containers<\/td><td>Run Applications<\/td><\/tr><tr><td>Example<\/td><td>ubuntu<\/td><td>abc<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Docker Images and Containers are closely related but serve different purposes. Images act as templates, while containers are the actual running environments created from those templates.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Benefits of Containerization<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Containerization has become a standard practice in modern application deployment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Portability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Applications run anywhere without modification.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Faster Deployments<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Containers start within seconds.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Resource Efficiency<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Containers share the host kernel and consume fewer resources.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Scalability<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Applications can scale horizontally with ease.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Consistency<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Docker Images and Containers ensure identical behavior across environments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Isolation<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Applications remain isolated from one another.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Improved CI\/CD<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Containers integrate seamlessly with modern CI\/CD pipelines.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Best Practices for Docker Images and Containers<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use official Docker images whenever possible.<\/li>\n\n\n\n<li>Keep container images lightweight.<\/li>\n\n\n\n<li>Avoid running applications as root.<\/li>\n\n\n\n<li>Remove unused containers regularly.<\/li>\n\n\n\n<li>Use Docker volumes for persistent data.<\/li>\n\n\n\n<li>Tag images properly.<\/li>\n\n\n\n<li>Scan images for vulnerabilities.<\/li>\n\n\n\n<li>Keep Docker updated.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Docker simplifies application deployment by packaging applications and their dependencies into lightweight, portable containers. Using Docker images and containers, developers and system administrators can quickly create isolated environments, improve deployment consistency, and reduce compatibility issues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this tutorial, we learned how to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Install and verify Docker<\/li>\n\n\n\n<li>Pull images from Docker Hub<\/li>\n\n\n\n<li>Create CentOS and Ubuntu containers<\/li>\n\n\n\n<li>Access running containers<\/li>\n\n\n\n<li>Verify operating system information<\/li>\n\n\n\n<li>Manage container lifecycle operations<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Docker is a foundational technology for DevOps, cloud-native applications, CI\/CD pipelines, microservices, and Kubernetes environments. Understanding these fundamentals provides a strong foundation for learning advanced Docker concepts such as custom images, Docker Compose, networking, volumes, and orchestration.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently Asked Questions (FAQ)<\/h2>\n\n\n\n<h4 class=\"wp-block-heading\">1. What is Docker?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Docker is an open-source platform that enables developers to package applications and dependencies into portable containers.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">2. What is a Docker Container?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">A Docker container is a lightweight and isolated runtime environment used to run applications.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">3. What is Docker Hub?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Docker Hub is a cloud-based repository used to store and distribute Docker images.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related Articles<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pheonixsolutions.com\/blog\/docker-container-to-image\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to Convert a Docker Container to Image<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pheonixsolutions.com\/blog\/how-to-save-docker-images-as-a-tar-file\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to Save Docker Images as a TAR File<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Talk to Our Technology Experts<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Containerizing your applications or setting up a Docker-based infrastructure? Our team can help with containerization, orchestration, and ongoing DevOps support.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pheonixsolutions.com\/contact\">Connect with our technology experts.<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Post Date: December 28, 2018Last Updated: October 03, 2026 Introduction Docker Images and Containers are the foundation of modern application 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