{"id":1259,"date":"2017-03-24T08:40:35","date_gmt":"2017-03-24T03:10:35","guid":{"rendered":"https:\/\/pheonixsolutions.com\/blog\/?p=1259"},"modified":"2026-08-15T14:20:45","modified_gmt":"2026-08-15T08:50:45","slug":"overview-of-docker","status":"publish","type":"post","link":"https:\/\/pheonixsolutions.com\/blog\/overview-of-docker\/","title":{"rendered":"Docker for Beginners: A Complete Guide to Installation and Essential Commands"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Introduction<\/h2>\n\n\n\n<p>Docker has become one of the most widely used tools in modern DevOps workflows, and for good reason. It lets developers package an application together with everything it needs  code, runtime, libraries, and system tools into a single lightweight unit called a <strong>container<\/strong>. That container runs the same way on your laptop, a test server, or in production, which eliminates the classic &#8220;it works on my machine&#8221; problem.<\/p>\n\n\n\n<p>If you&#8217;re just getting started with Docker, this guide walks you through installing it on Ubuntu and covers the essential commands you&#8217;ll use every day, from pulling your first image to managing containers, volumes, and network ports.<\/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 Docker?<\/h2>\n\n\n\n<p>Docker is a platform for building, shipping, and running applications inside isolated environments called containers. Unlike a full virtual machine, a container shares the host system&#8217;s kernel, which makes it much faster to start and far more efficient with system resources.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Installing Docker on Ubuntu<\/h2>\n\n\n\n<p>Setting up Docker on an Ubuntu machine involves a few straightforward steps. The commands below work the same way across most Linux distributions, though installation steps can vary slightly depending on your base OS.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Step 1: Install Required Dependencies<\/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=\"\">sudo apt-get install -y --no-install-recommends \\\napt-transport-https \\\nca-certificates \\\ncurl \\\nsoftware-properties-common\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 2: Add the Docker GPG Key<\/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=\"\">curl -fsSL https:\/\/apt.dockerproject.org\/gpg | sudo apt-key add -\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 3: Add the Docker Repository<\/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=\"\">add-apt-repository \\\n\"deb https:\/\/apt.dockerproject.org\/repo\/ \\\nubuntu-$(lsb_release -cs) \\\nmain\"\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 4: Update Package Lists<\/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=\"\">apt-get update\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Step 5: Install the Docker Engine<\/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=\"\">apt-get -y install docker-engine\n<\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Docker&#8217;s Basic Directory Structure<\/h2>\n\n\n\n<p>Once installed, Docker stores its data in a predictable set of directories:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Path<\/th><th>Purpose<\/th><\/tr><\/thead><tbody><tr><td><code>\/var\/lib\/docker<\/code><\/td><td>Base directory for all Docker data<\/td><\/tr><tr><td><code>\/var\/lib\/docker\/container<\/code><\/td><td>Stores container information<\/td><\/tr><tr><td><code>\/var\/lib\/docker\/container\/&lt;container-longname&gt;\/hostconfig.json<\/code><\/td><td>Full host configuration details for a container<\/td><\/tr><tr><td><code>\/var\/lib\/docker\/volumes\/&lt;volumeID&gt;\/_data<\/code><\/td><td>Persistent data created inside a container&#8217;s volume<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Essential Docker Commands<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Running Your First Container<\/h3>\n\n\n\n<p>Test your installation by pulling and running the classic hello-world image:<\/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 run hello-world\n<\/pre>\n\n\n\n<p>To pull an Ubuntu image and drop into an interactive terminal:<\/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 run -it ubuntu bash\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Working with Images<\/h3>\n\n\n\n<p>View all images available locally:<\/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 images\n<\/pre>\n\n\n\n<p>Tag an image before pushing it to a registry:<\/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 tag 73fd91f23a84 pheonixsolutions\/docker-whale:latest\n<\/pre>\n\n\n\n<p><em>(<code>73fd91f23a84<\/code> is the image ID.)<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pushing and Pulling Images from Docker Hub<\/h3>\n\n\n\n<p>Create a free account at <a href=\"https:\/\/hub.docker.com\/\">hub.docker.com<\/a>, then log in from the terminal:<\/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 login\n<\/pre>\n\n\n\n<p>Push a tagged image to your Docker Hub repository:<\/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 push pheonixsolutions\/docker-whale\n<\/pre>\n\n\n\n<p>Pull and run an image from a repository:<\/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 run pheonixsolutions\/docker-whale\n<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Managing Containers<\/h3>\n\n\n\n<p>Start an interactive container session:<\/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 run -ti ubuntu:14.04 \/bin\/bash\n<\/pre>\n\n\n\n<p>Press <strong>Ctrl + P + Q<\/strong> to detach from the container without stopping it.<\/p>\n\n\n\n<p>List currently 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\n<\/pre>\n\n\n\n<p>Reattach to a running container using its ID:<\/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 attach c26fe223abeb\n<\/pre>\n\n\n\n<p>List all containers, including stopped ones:<\/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 -a\n<\/pre>\n\n\n\n<p>Start a stopped container:<\/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 start 196b121e371b\n<\/pre>\n\n\n\n<p>Stop a running container:<\/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 stop 196b121e371b\n<\/pre>\n\n\n\n<p>Run a named, detached container:<\/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 run -d -ti --name=pheonixcontainer ubuntu:14.04 \/bin\/bash\n<\/pre>\n\n\n\n<p>Here, <code>-d<\/code> detaches the container so it runs in the background, and <code>--name<\/code> assigns it a readable name.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Working with Volumes<\/h3>\n\n\n\n<p>Mount a volume inside the container at <code>\/data<\/code>:<\/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 run -ti -v \/data --name=pheonixvolume ubuntu:14.04\n<\/pre>\n\n\n\n<p>Mount a specific host directory into the container:<\/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 run -ti -v \/home\/pheonixsolutions:\/data --name=pheonixvolume ubuntu:14.04\n<\/pre>\n\n\n\n<p>The <code>-v<\/code> flag defines the container&#8217;s mount point.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Mapping Ports<\/h3>\n\n\n\n<p>Expose a container port (e.g., for MySQL):<\/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 run -d -p 3306 -ti --name=mysql1 mysql \/bin\/bash\n<\/pre>\n\n\n\n<p>Forward a specific host port to the container:<\/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 run -d -p 80:80 -ti --name=mysql2 mysql \/bin\/bash\n<\/pre>\n\n\n\n<p>The <code>80:80<\/code> mapping forwards requests on host port 80 to the container&#8217;s port 80.<\/p>\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>Docker simplifies how applications are built, packaged, and deployed by wrapping everything an app needs into a portable container. Once you&#8217;re comfortable with the basics installing Docker, pulling and tagging images, managing containers, and mapping volumes and ports you have the foundation needed to explore more advanced DevOps workflows like Docker Compose and container orchestration with Kubernetes.<\/p>\n\n\n\n<p>Start small: run the <code>hello-world<\/code> image, spin up an Ubuntu container, and get hands-on with the commands above. The best way to learn Docker is by using it.<\/p>\n\n\n\n<p>Related Articles:<\/p>\n\n\n\n<p><a href=\"https:\/\/pheonixsolutions.com\/blog\/how-to-convert-a-docker-container-into-a-docker-image\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to convert a docker container into a docker image?<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/pheonixsolutions.com\/blog\/simple-steps-to-install-docker-on-ubuntu\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to install docker on ubuntu in simple steps?<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Introduction Docker has become one of the most widely used tools in modern DevOps workflows, and for good reason. It lets developers package an application together with everything it needs code, runtime, libraries, and system tools into a single lightweight unit called a container. That container runs the same way&hellip; <a href=\"https:\/\/pheonixsolutions.com\/blog\/overview-of-docker\/\" class=\"more-link read-more\" rel=\"bookmark\">Continue Reading <span class=\"screen-reader-text\">Docker for Beginners: A Complete Guide to Installation and Essential Commands<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[303,306],"tags":[305,304],"class_list":{"0":"post-1259","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-devops","7":"category-docker","8":"tag-devops","9":"tag-docker","10":"h-entry","12":"h-as-article"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pheonix Solutions - We Empower Your Business Growth<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pheonixsolutions.com\/blog\/overview-of-docker\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pheonix Solutions - We Empower Your Business Growth\" \/>\n<meta property=\"og:description\" content=\"Introduction Docker has become one of the most widely used tools in modern DevOps workflows, and for good reason. It lets developers package an application together with everything it needs code, runtime, libraries, and system tools into a single lightweight unit called a container. That container runs the same way&hellip; Continue Reading Docker for Beginners: A Complete Guide to Installation and Essential Commands\" \/>\n<meta property=\"og:url\" content=\"https:\/\/pheonixsolutions.com\/blog\/overview-of-docker\/\" \/>\n<meta property=\"og:site_name\" content=\"PHEONIXSOLUTIONS\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/PheonixSolutions-209942982759387\/\" \/>\n<meta property=\"article:published_time\" content=\"2017-03-24T03:10:35+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-15T08:50:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pheonixsolutions.com\/blog\/wp-content\/uploads\/2016\/09\/PX2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"3837\" \/>\n\t<meta property=\"og:image:height\" content=\"2540\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@pheonixsolution\" \/>\n<meta name=\"twitter:site\" content=\"@pheonixsolution\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/blog\\\/overview-of-docker\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/blog\\\/overview-of-docker\\\/\"},\"author\":{\"name\":\"admin\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/blog\\\/#\\\/schema\\\/person\\\/0ffa33d73c869faec2d50e79c24e3503\"},\"headline\":\"Docker for Beginners: A Complete Guide to Installation and Essential Commands\",\"datePublished\":\"2017-03-24T03:10:35+00:00\",\"dateModified\":\"2026-08-15T08:50:45+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/blog\\\/overview-of-docker\\\/\"},\"wordCount\":586,\"commentCount\":2,\"publisher\":{\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/blog\\\/#organization\"},\"keywords\":[\"devops\",\"docker\"],\"articleSection\":[\"Devops\",\"Docker\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/pheonixsolutions.com\\\/blog\\\/overview-of-docker\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/pheonixsolutions.com\\\/blog\\\/overview-of-docker\\\/\",\"url\":\"https:\\\/\\\/pheonixsolutions.com\\\/blog\\\/overview-of-docker\\\/\",\"name\":\"Pheonix Solutions - 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