{"id":12707,"date":"2025-12-20T11:45:21","date_gmt":"2025-12-20T06:15:21","guid":{"rendered":"https:\/\/www.youstable.com\/blog\/?p=12707"},"modified":"2025-12-24T16:17:50","modified_gmt":"2025-12-24T10:47:50","slug":"what-is-docker-on-linux-server","status":"publish","type":"post","link":"https:\/\/www.youstable.com\/blog\/what-is-docker-on-linux-server","title":{"rendered":"What is Docker on Linux Server? (Step-by-Step Guide 2026)"},"content":{"rendered":"\n<p><strong>Docker on a Linux server<\/strong> is a containerization platform that packages applications with all dependencies into isolated units called containers. To use it, install Docker Engine, pull images from a registry, run containers with the CLI or Compose, secure them with least privilege, and monitor performance. It improves portability, density, and deployment speed.<\/p>\n\n\n\n<p>If you want to understand Docker on a Linux server without the jargon, this guide walks you from first principles to production-ready practices. We\u2019ll cover how Docker works on Linux, installation on popular distributions, essential commands, Compose, security, performance tuning, monitoring, and troubleshooting\u2014based on real hosting experience.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"what-is-docker-and-how-it-works-on-linux\"><strong>What is Docker and How it Works on Linux<\/strong>?<\/h2>\n\n\n\n<div class=\"wp-block-media-text has-media-on-the-right is-stacked-on-mobile\" style=\"grid-template-columns:auto 40%\"><div class=\"wp-block-media-text__content\">\n<p>Docker is an open platform to build, ship, and run applications inside containers. On Linux, Docker leverages kernel features like namespaces and cgroups to isolate processes, control resources, and provide a lightweight alternative to traditional virtual machines.<\/p>\n<\/div><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"1168\" height=\"784\" src=\"https:\/\/www.youstable.com\/blog\/wp-content\/uploads\/2025\/12\/What-Is-Docker-and-How-It-Works-on-Linux-1.png\" alt=\"What Is Docker and How It Works on Linux\" class=\"wp-image-12972 size-full\" srcset=\"https:\/\/www.youstable.com\/blog\/wp-content\/uploads\/2025\/12\/What-Is-Docker-and-How-It-Works-on-Linux-1.png 1168w, https:\/\/www.youstable.com\/blog\/wp-content\/uploads\/2025\/12\/What-Is-Docker-and-How-It-Works-on-Linux-1-150x101.png 150w\" sizes=\"auto, (max-width: 1168px) 100vw, 1168px\" \/><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"containers-vs-virtual-machines\"><strong>Containers vs Virtual Machines<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Isolation layer: <\/strong>Containers share the host kernel; VMs run full guest OS kernels.<\/li>\n\n\n\n<li><strong>Overhead:<\/strong> Containers start in milliseconds and use fewer resources; VMs take more memory\/CPU.<\/li>\n\n\n\n<li><strong>Portability:<\/strong> Container images are consistent across environments; VMs are heavier to move.<\/li>\n\n\n\n<li><strong>Use cases:<\/strong> Containers excel for microservices and web apps; VMs suit strong isolation or mixed OS needs.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"core-building-blocks\"><strong>Core Building Blocks<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Images:<\/strong> Read-only templates (layered) that define your app and its dependencies.<\/li>\n\n\n\n<li><strong>Containers: <\/strong>Running instances of images, with a writable layer.<\/li>\n\n\n\n<li><strong>Docker Engine:<\/strong> The daemon (dockerd) and CLI that manage images\/containers; uses containerd under the hood.<\/li>\n\n\n\n<li><strong>Registry: <\/strong>A repository (e.g., Docker Hub or private) to store and pull images.<\/li>\n\n\n\n<li><strong>Dockerfile: <\/strong>Script to build images deterministically.<\/li>\n\n\n\n<li><strong>Docker Compose: <\/strong>YAML-based tool to define multi-container apps and dependencies.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"under-the-hood-on-linux\"><strong>Under the Hood on Linux<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Namespaces:<\/strong> pid, net, mnt, ipc, uts, and user isolate processes and resources.<\/li>\n\n\n\n<li><strong>cgroups v2: <\/strong>Limit and account CPU, memory, PIDs, I\/O.<\/li>\n\n\n\n<li><strong>Storage driver: <\/strong>overlay2 is the default and most efficient for modern kernels.<\/li>\n\n\n\n<li><strong>Networking:<\/strong> Default bridge (docker0), user-defined bridges, host mode, macvlan.<\/li>\n\n\n\n<li><strong>Init\/systemd:<\/strong> Docker runs as a systemd service; containers can be managed via systemd units if needed.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"prerequisites-and-choosing-a-linux-distro\"><strong>Prerequisites and Choosing a Linux Distro<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Kernel:<\/strong> Modern 5.x+ kernels with cgroups v2 and nf_tables recommended.<\/li>\n\n\n\n<li><strong>Distros: <\/strong>Ubuntu LTS and Debian are beginner-friendly; AlmaLinux\/Rocky for RHEL clones; Fedora for latest features.<\/li>\n\n\n\n<li><strong>Storage:<\/strong> SSD\/NVMe improves build and I\/O performance for images and volumes.<\/li>\n\n\n\n<li><strong>Firewall: <\/strong>Know how Docker interacts with iptables\/nftables to avoid surprises.<\/li>\n\n\n\n<li><strong>Access: <\/strong>Non-root user with sudo; optional rootless Docker for extra isolation.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"install-docker-on-linux-step-by-step\"><strong>Install Docker on Linux (Step-by-Step)<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"ubuntu-debian\"><strong>Ubuntu \/ Debian<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt-get update\nsudo apt-get install -y ca-certificates curl gnupg lsb-release\nsudo install -m 0755 -d \/etc\/apt\/keyrings\ncurl -fsSL https:\/\/download.docker.com\/linux\/ubuntu\/gpg | sudo gpg --dearmor -o \/etc\/apt\/keyrings\/docker.gpg\necho \\\n  \"deb &#91;arch=$(dpkg --print-architecture) signed-by=\/etc\/apt\/keyrings\/docker.gpg] \\\n  https:\/\/download.docker.com\/linux\/ubuntu \\\n  $(. \/etc\/os-release &amp;&amp; echo $VERSION_CODENAME) stable\" | \\\n  sudo tee \/etc\/apt\/sources.list.d\/docker.list &gt; \/dev\/null\nsudo apt-get update\nsudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin\nsudo systemctl enable --now docker\nsudo usermod -aG docker $USER  # log out\/in to apply\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"rhel-centos-stream-almalinux-rocky\"><strong>RHEL \/ CentOS Stream \/ AlmaLinux \/ Rocky<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo dnf -y install dnf-plugins-core\nsudo dnf config-manager --add-repo https:\/\/download.docker.com\/linux\/centos\/docker-ce.repo\nsudo dnf install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin\nsudo systemctl enable --now docker\nsudo usermod -aG docker $USER  # log out\/in to apply\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"fedora\"><strong>Fedora<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo dnf -y install dnf-plugins-core\nsudo dnf config-manager --add-repo https:\/\/download.docker.com\/linux\/fedora\/docker-ce.repo\nsudo dnf install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin\nsudo systemctl enable --now docker\nsudo usermod -aG docker $USER\n<\/code><\/pre>\n\n\n\n<p><strong>Optional: <\/strong>Run Docker in rootless mode for stronger host isolation.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Install prerequisites (Ubuntu example)\nsudo apt-get install -y uidmap dbus-user-session slirp4netns\n# As the non-root user:\ndockerd-rootless-setuptool.sh install\n# Then use: export DOCKER_HOST=unix:\/\/\/run\/user\/$(id -u)\/docker.sock\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"first-10-docker-commands-youll-use-daily\"><strong>First 10 Docker Commands You\u2019ll Use Daily<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code># Verify Docker works\ndocker run --rm hello-world\n\n# Start Nginx\ndocker run -d --name web -p 80:80 nginx:alpine\n\n# List, inspect, logs\ndocker ps\ndocker logs -f web\ndocker inspect web\n\n# Exec into a container\ndocker exec -it web sh\n\n# Stop and remove\ndocker stop web &amp;&amp; docker rm web\n\n# Images and cleanup\ndocker images\ndocker rmi &lt;image_id&gt;\ndocker system prune -af  # removes unused data\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"build-your-first-image-and-use-docker-compose\"><strong>Build Your First Image and Use Docker Compose<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"minimal-dockerfile-python-example\"><strong>Minimal Dockerfile (Python Example)<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code># Dockerfile\nFROM python:3.12-slim\nWORKDIR \/app\nCOPY requirements.txt .\nRUN <a href=\"https:\/\/www.youstable.com\/blog\/install-pip-on-ubuntu\/\">pip install<\/a> --no-cache-dir -r requirements.txt\nCOPY . .\n# Drop privileges\nRUN useradd -u 10001 -r -s \/sbin\/nologin appuser\nUSER 10001\nEXPOSE 8000\nCMD &#91;\"python\", \"app.py\"]\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"compose-a-web-plus-database-stack\"><strong>Compose a Web + Database Stack<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code># docker-compose.yml (Docker Compose v2 uses `docker compose` command)\nversion: \"3.9\"\nservices:\n  web:\n    build: .\n    ports:\n      - \"8000:8000\"\n    environment:\n      - DATABASE_URL=postgresql:\/\/app:secret@db:5432\/app\n    depends_on:\n      - db\n    volumes:\n      - .:\/app\n  db:\n    image: postgres:16\n    environment:\n      - POSTGRES_USER=app\n      - POSTGRES_PASSWORD=secret\n      - POSTGRES_DB=app\n    volumes:\n      - pgdata:\/var\/lib\/postgresql\/data\nvolumes:\n  pgdata:\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code># Build and start in background\ndocker compose up -d --build\n# View status and logs\ndocker compose ps\ndocker compose logs -f\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"persist-data-with-volumes-and-bind-mounts\"><strong>Persist Data with Volumes and Bind Mounts<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Volumes:<\/strong> Managed by Docker; best for databases and portability.<\/li>\n\n\n\n<li><strong>Bind mounts:<\/strong> Map host directories into containers; ideal for development.<\/li>\n\n\n\n<li><strong>Backups:<\/strong> Archive volumes to tarballs for simple offsite storage.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code># Backup a named volume\ndocker run --rm -v pgdata:\/data -v $(pwd):\/backup alpine \\\n  tar czf \/backup\/pgdata_$(date +%F).tgz -C \/data .\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"networking-basics-for-docker-on-a-linux-server\"><strong>Networking Basics for Docker on a Linux Server<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Default bridge:<\/strong> Containers get private IPs; publish ports with -p host:container.<\/li>\n\n\n\n<li><strong>User-defined bridge: <\/strong>Better service discovery and isolation.<\/li>\n\n\n\n<li><strong>Host network: <\/strong>Highest performance, less isolation; use carefully.<\/li>\n\n\n\n<li><strong>Reverse proxies:<\/strong> Nginx or Traefik route traffic to containers and handle TLS.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code># Create an isolated network and attach containers\ndocker network create appnet\ndocker run -d --name api --network appnet my\/api:latest\ndocker run -d --name proxy --network appnet -p 80:80 -p 443:443 nginx:alpine\n<\/code><\/pre>\n\n\n\n<p><strong>Firewalls:<\/strong> Docker manages iptables\/nftables rules automatically. If you use UFW, be aware Docker can bypass default policies. Apply allow\/deny rules in the DOCKER-USER chain for global container filtering.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Example: allow HTTP\/HTTPS, then drop everything else (adjust interface)\nsudo iptables -I DOCKER-USER -p tcp --dport 80 -j ACCEPT\nsudo iptables -I DOCKER-USER -p tcp --dport 443 -j ACCEPT\nsudo iptables -A DOCKER-USER -j DROP\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"security-best-practices-for-docker-in-production\"><strong>Security Best Practices for Docker in Production<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Least privilege:<\/strong> Run as non-root inside containers (USER in Dockerfile). Avoid &#8211;privileged and mount only what you must.<\/li>\n\n\n\n<li><strong>Capabilities:<\/strong> Drop all and add back only needed ones (e.g., NET_BIND_SERVICE).<\/li>\n\n\n\n<li><strong>Read-only rootfs:<\/strong> Use &#8211;read-only and mount writable dirs explicitly.<\/li>\n\n\n\n<li><strong>Resource limits:<\/strong> Constrain CPU, memory, and PIDs to contain abuse.<\/li>\n\n\n\n<li><strong>Rootless mode:<\/strong> Consider for multi-tenant hosts.<\/li>\n\n\n\n<li><strong>Secrets: <\/strong>Pass sensitive data via Docker secrets or environment injection from a vault.<\/li>\n\n\n\n<li><strong>Image hygiene: <\/strong>Use slim base images, pin versions, and scan with tools like Trivy.<\/li>\n\n\n\n<li><strong>Supply chain: <\/strong>Sign and verify images (Docker Content Trust\/Cosign).<\/li>\n\n\n\n<li><strong>Patch cadence: <\/strong>Rebuild images regularly to pick up base image security updates.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code># Example: locked-down run\ndocker run -d --name web \\\n  --cap-drop=ALL --cap-add=NET_BIND_SERVICE \\\n  --read-only --tmpfs \/tmp --pids-limit=200 \\\n  --memory=512m --cpus=\"1.0\" --security-opt no-new-privileges \\\n  -p 80:8000 myorg\/web:1.0\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"monitoring-logging-and-backups\"><strong>Monitoring, Logging, and Backups<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Logs:<\/strong> By default, Docker uses the json-file driver. For production, forward to journald, syslog, or a log collector (Fluentd\/Vector).<\/li>\n\n\n\n<li><strong>Metrics: <\/strong>Use cAdvisor and Prometheus\/Grafana for container CPU, memory, I\/O, and network metrics.<\/li>\n\n\n\n<li><strong>Healthchecks: <\/strong>Add HEALTHCHECK in Dockerfile and have orchestrators restart unhealthy containers.<\/li>\n\n\n\n<li><strong>Backups: <\/strong>Snapshot volumes, database dumps, and Compose files. Test restores.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code># docker daemon logging to journald (daemon.json)\nsudo mkdir -p \/etc\/docker\ncat | sudo tee \/etc\/docker\/daemon.json &gt;\/dev\/null &lt;&lt;'JSON'\n{\n  \"log-driver\": \"journald\",\n  \"storage-driver\": \"overlay2\"\n}\nJSON\nsudo systemctl restart docker\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"performance-tuning-on-linux-servers\"><strong>Performance Tuning on Linux Servers<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Storage driver: <\/strong>Use overlay2 on ext4\/xfs (without d_type disabled). Avoid devicemapper in loopback mode.<\/li>\n\n\n\n<li><strong>Hardware: <\/strong>Prefer NVMe SSDs; allocate enough RAM for builds and caches.<\/li>\n\n\n\n<li><strong>Build optimization: <\/strong>Multi-stage builds, .dockerignore, and layer caching save time and space.<\/li>\n\n\n\n<li><strong>Kernel and sysctl:<\/strong> Keep kernel updated; tune vm.swappiness and file descriptors for high-conn apps.<\/li>\n\n\n\n<li><strong>Limits:<\/strong> Set sensible &#8211;memory, &#8211;cpus, and &#8211;pids-limit to prevent noisy neighbors.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"real-world-use-cases-and-when-not-to-use-docker\"><strong>Real-World Use Cases and When Not to Use Docker<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Microservices and APIs: <\/strong>Fast deploys with blue\/green strategies.<\/li>\n\n\n\n<li><strong>Web stacks:<\/strong> Nginx + PHP-FPM or Node.js, proxied by Traefik, with Let\u2019s Encrypt.<\/li>\n\n\n\n<li><strong>CI\/CD:<\/strong> Build, test, and ship consistent artifacts via registries.<\/li>\n\n\n\n<li><strong>Cron\/Workers: <\/strong>Queue consumers and scheduled jobs as isolated containers.<\/li>\n\n\n\n<li><strong>Databases: <\/strong>Viable with persistent volumes and tuned I\/O, but managed DBs may be simpler.<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Not ideal for: <\/strong>Apps needing kernel modules, full desktop UIs, or strict isolation bordering on VM-level security without extra controls.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"common-errors-and-quick-fixes\"><strong>Common Errors and Quick Fixes<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Permission denied on \/var\/run\/docker.sock: <\/strong>Add your user to the docker group, log out\/in, or use sudo.<\/li>\n\n\n\n<li><strong>Cannot connect to Docker daemon:<\/strong> Ensure service is running (systemctl status docker); check rootless DOCKER_HOST.<\/li>\n\n\n\n<li><strong>Port already in use:<\/strong> Find conflicts with <code>ss -tulpn | grep :80<\/code> and stop the other service or change ports.<\/li>\n\n\n\n<li><strong>No space left on device:<\/strong> <code>docker system prune -af<\/code>; move Docker data-root in <code>\/etc\/docker\/daemon.json<\/code> and restart.<\/li>\n\n\n\n<li><strong>Firewall surprises:<\/strong> Use DOCKER-USER chain to enforce global rules; verify nftables vs iptables-legacy mode.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code># Example: move Docker data-root to a larger disk\ncat | sudo tee \/etc\/docker\/daemon.json &gt;\/dev\/null &lt;&lt;'JSON'\n{\n  \"data-root\": \"\/mnt\/docker\",\n  \"storage-driver\": \"overlay2\"\n}\nJSON\nsudo systemctl stop docker\nsudo rsync -aHXS --numeric-ids \/var\/lib\/docker\/ \/mnt\/docker\/\nsudo systemctl start docker\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" class=\"wp-block-heading\" id=\"faqs\"><strong>FAQs:<\/strong><\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-question-1765612258235\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \" class=\"rank-math-question \" id=\"is-docker-a-virtual-machine-on-linux\"><strong>Is Docker a virtual machine on Linux?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>No. Docker uses the <a href=\"https:\/\/www.youstable.com\/blog\/best-linux-distros-for-hosting\/\">host Linux<\/a> kernel and isolates processes with namespaces and cgroups. That\u2019s why containers are lighter and faster than VMs, but they provide less isolation. For strong boundaries or different OS kernels, use VMs; for speed and density, use containers.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1765612277269\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \" class=\"rank-math-question \" id=\"how-do-i-install-docker-on-ubuntu-the-right-way\"><strong>How do I install Docker on Ubuntu the right way?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Add the official Docker repository, install docker-ce, docker-ce-cli, containerd.io, and the Docker Compose plugin, then enable the service. Avoid outdated distro packages. After install, add your user to the docker group and relogin.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1765612297669\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \" class=\"rank-math-question \" id=\"should-i-run-containers-as-root\"><strong>Should I run containers as root?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Prefer non-root users inside containers (USER in Dockerfile) and avoid &#8211;privileged. Consider rootless Docker for extra protection on shared hosts. Drop Linux capabilities, use read-only filesystems, and limit resources for defense-in-depth.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1765612310397\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \" class=\"rank-math-question \" id=\"what-is-the-difference-between-docker-and-docker-compose\"><strong>What is the difference between Docker and Docker Compose?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Docker is the engine and CLI to build and run a single container. Docker Compose orchestrates multi-container applications with a declarative YAML file, handling networks, volumes, dependencies, and environment configuration.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1765612332446\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \" class=\"rank-math-question \" id=\"how-do-i-back-up-docker-volumes-safely\"><strong>How do I back up Docker volumes safely?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Use per-service backup strategies. For databases, perform logical dumps (e.g., pg_dump, mysqldump) and\/or filesystem snapshots when containers are quiesced. For general volumes, tarball the volume path via a throwaway container and store it offsite. Test restores regularly.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Docker on a Linux server is a containerization platform that packages applications with all dependencies into isolated units called containers. [&hellip;]<\/p>\n","protected":false},"author":21,"featured_media":15586,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[350,1195],"tags":[],"class_list":["post-12707","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledgebase","category-blogging"],"acf":[],"featured_image_src":"https:\/\/www.youstable.com\/blog\/wp-content\/uploads\/2025\/12\/What-is-Docker-on-Linux-Server-1.jpg","author_info":{"display_name":"Sanjeet Chauhan","author_link":"https:\/\/www.youstable.com\/blog\/author\/sanjeet"},"_links":{"self":[{"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/posts\/12707","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/users\/21"}],"replies":[{"embeddable":true,"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/comments?post=12707"}],"version-history":[{"count":11,"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/posts\/12707\/revisions"}],"predecessor-version":[{"id":15587,"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/posts\/12707\/revisions\/15587"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/media\/15586"}],"wp:attachment":[{"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/media?parent=12707"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/categories?post=12707"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.youstable.com\/blog\/wp-json\/wp\/v2\/tags?post=12707"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}