{"id":464,"date":"2024-07-22T12:11:57","date_gmt":"2024-07-22T12:11:57","guid":{"rendered":"https:\/\/dockerpros.com\/?p=464"},"modified":"2024-07-23T14:08:20","modified_gmt":"2024-07-23T14:08:20","slug":"understanding-the-causes-of-unexpected-container-shutdowns","status":"publish","type":"post","link":"https:\/\/dockerpros.com\/fr\/container-creation-and-management\/understanding-the-causes-of-unexpected-container-shutdowns\/","title":{"rendered":"Understanding the Causes of Unexpected Container Shutdowns"},"content":{"rendered":"

Comprendre et r\u00e9soudre les probl\u00e8mes d'arr\u00eats inattendus des conteneurs Docker<\/h1>\n

Docker a r\u00e9volutionn\u00e9 la mani\u00e8re dont nous d\u00e9ployons et g\u00e9rons les applications en les encapsulant dans des conteneurs l\u00e9gers et portables. Cependant, \u00e0 mesure que les d\u00e9veloppeurs et les \u00e9quipes op\u00e9rationnelles deviennent de plus en plus d\u00e9pendants de conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> technology, they occasionally encounter a frustrating issue: containers stopping unexpectedly. This article delves into the myriad reasons why Docker containers might stop suddenly and will provide step-by-step solutions to troubleshoot and resolve these issues effectively.<\/p>\n

The Lifecycle of a Docker Container<\/h2>\n

Before we explore the reasons behind unexpected stops, it’s essential to understand the lifecycle of a Docker conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>. A Docker conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> goes through several states:<\/p>\n

    \n
  1. Cr\u00e9\u00e9<\/strong>Le conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> is created but not started.<\/li>\n
  2. Courir<\/strong>Le conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> is actively executing its process.<\/li>\n
  3. Paused<\/strong>: The container\u2019s processes have been temporarily halted.<\/li>\n
  4. Exited<\/strong>Le conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> has stopped running for some reason.<\/li>\n<\/ol>\n

    An exited conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> can be restarted unless it was explicitly configured to stop terminating after failure. Thus, understanding the state transitions can help pinpoint issues.<\/p>\n

    Common Reasons for Unexpected Container Stops<\/h2>\n
      \n
    1. \n

      \u00c9chec de l'application<\/strong>: The most straightforward reason for a conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> to stop is that the application running inside it has crashed. This could be due to uncaught exceptions, segmentation faults, or other operational failures.<\/p>\n<\/li>\n

    2. \n

      Contraintes de ressources<\/strong>: Containers are designed to be lightweight, but that doesn\u2019t mean they can run<\/a><\/span>\"RUN\" refers to a command in various programming languages and operating systems to execute a specified program or script. It initiates processes, providing a controlled environment for task execution. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> indefinitely without proper resource allocation. If a conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> exceeds its CPU or memory limits, the Docker d\u00e9mon<\/a><\/span>Un d\u00e9mon est un processus d'arri\u00e8re-plan en informatique qui s'ex\u00e9cute de mani\u00e8re autonome, effectuant des t\u00e2ches sans intervention de l'utilisateur. Il g\u00e8re g\u00e9n\u00e9ralement des fonctions au niveau du syst\u00e8me ou de l'application, am\u00e9liorant ainsi l'efficacit\u00e9. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> may stop it.<\/p>\n<\/li>\n

    3. \n

      Exit Codes<\/strong>: Every time a conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> stops, it does so with an exit code. If the application inside the conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> exits with a non-zero exit code, Docker considers it as an error. Common exit codes include 1 (Erreur g\u00e9n\u00e9rale)<\/code>, 137 (M\u00e9moire insuffisante)<\/code>, and 255 (Code de sortie hors plage)<\/code>.<\/p>\n<\/li>\n

    4. \n

      Contr\u00f4le de sant\u00e9<\/a><\/span>A health check is a systematic evaluation of an individual's physical and mental well-being, often involving assessments of vital signs, medical history, and lifestyle factors to identify potential health risks. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> Failures<\/strong>: Docker allows you to define health checks that monitor the state of your applications. If these checks fail consistently, Docker will mark the conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> as unhealthy and will stop it based on your configuration.<\/p>\n<\/li>\n

    5. \n

      Probl\u00e8mes de configuration<\/strong>: Erreur de configuration dans le Dockerfile<\/a><\/span>A Dockerfile is a script containing a series of instructions to automate the creation of Docker images. It specifies the base image, application dependencies, and configuration, facilitating consistent deployment across environments. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>, such as an incorrect command or entry point, can cause the conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> to exit immediately upon launch.<\/p>\n<\/li>\n

    6. \n

      R\u00e9seau<\/a><\/span>A network, in computing, refers to a collection of interconnected devices that communicate and share resources. It enables data exchange, facilitates collaboration, and enhances operational efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> Issues<\/strong>: If your application is dependent on external services (for example, databases or APIs) and those services are unreachable, the application may stop running.<\/p>\n<\/li>\n

    7. \n

      Docker Daemon<\/a><\/span>Un d\u00e9mon est un processus d'arri\u00e8re-plan en informatique qui s'ex\u00e9cute de mani\u00e8re autonome, effectuant des t\u00e2ches sans intervention de l'utilisateur. Il g\u00e8re g\u00e9n\u00e9ralement des fonctions au niveau du syst\u00e8me ou de l'application, am\u00e9liorant ainsi l'efficacit\u00e9. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> Issues<\/strong>: Sometimes the problem may not be with the conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> itself but with the Docker d\u00e9mon<\/a><\/span>Un d\u00e9mon est un processus d'arri\u00e8re-plan en informatique qui s'ex\u00e9cute de mani\u00e8re autonome, effectuant des t\u00e2ches sans intervention de l'utilisateur. Il g\u00e8re g\u00e9n\u00e9ralement des fonctions au niveau du syst\u00e8me ou de l'application, am\u00e9liorant ainsi l'efficacit\u00e9. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>, which manages containers. If the d\u00e9mon<\/a><\/span>Un d\u00e9mon est un processus d'arri\u00e8re-plan en informatique qui s'ex\u00e9cute de mani\u00e8re autonome, effectuant des t\u00e2ches sans intervention de l'utilisateur. Il g\u00e8re g\u00e9n\u00e9ralement des fonctions au niveau du syst\u00e8me ou de l'application, am\u00e9liorant ainsi l'efficacit\u00e9. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> encounters issues, it may affect the running containers.<\/p>\n<\/li>\n<\/ol>\n

      Diagnostic des arr\u00eats inattendus de conteneurs<\/h2>\n

      La premi\u00e8re \u00e9tape pour r\u00e9soudre les arr\u00eats inattendus consiste \u00e0 diagnostiquer le probl\u00e8me. Voici une approche structur\u00e9e :<\/p>\n

      \u00c9tape 1 : V\u00e9rifier les journaux des conteneurs<\/h3>\n

      Docker captures logs for each conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> which can provide insight into what went wrong. Use the following command to view the logs:<\/p>\n

      docker logs <\/code><\/pre>\n
      Cette commande affichera la sortie de l'application, y compris les \u00e9ventuelles erreurs qu'elle a pu rencontrer. <\/p>\n
      \u00c9tape 2 : Inspecter le conteneur<\/h3>\n
      The docker inspect<\/code> command provides detailed information about a conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>, including its configuration, state, and resource usage:<\/p>\n
      docker inspect <\/code><\/pre>\n
      Cherchez le \u00c9tat<\/code> section, which includes information about the exit status and error messages.<\/p>\n
      \u00c9tape 3 : Examinez les codes de sortie<\/h3>\n
      After a conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> stops, you can check its exit code with the following command:<\/p>\n
      docker ps -a<\/code><\/pre>\n
      Cette commande r\u00e9pertorie tous les conteneurs, y compris ceux qui se sont arr\u00eat\u00e9s, ainsi que leurs codes de sortie.<\/p>\n
      \u00c9tape 4 : V\u00e9rifier l'utilisation des ressources<\/h3>\n
      Pour enqu\u00eater sur le fait que les contraintes de ressources ont contribu\u00e9 au probl\u00e8me, vous pouvez utiliser le docker stats<\/code> command. This command provides real-time statistics about the containers\u2019 CPU, memory, and I\/O usage:<\/p>\n
      docker stats<\/code><\/pre>\n
      If a conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> is consuming too much memory, it could be killed by the kernel’s OOM (Out of Memory) killer.<\/p>\n
      Step 5: Verify Health Check Status<\/h3>\n
      Si vous avez configur\u00e9 des v\u00e9rifications de sant\u00e9, v\u00e9rifiez leur \u00e9tat pour voir si elles ont contribu\u00e9 \u00e0 l'arr\u00eat du conteneur :<\/p>\n
      docker inspect --format='{{json .State.Health}}' <\/code><\/pre>\n
      \u00c9tape 6 : V\u00e9rifier les journaux syst\u00e8me<\/h3>\n
      System logs can sometimes hold clues about issues impacting Docker containers. Check the d\u00e9mon<\/a><\/span>Un d\u00e9mon est un processus d'arri\u00e8re-plan en informatique qui s'ex\u00e9cute de mani\u00e8re autonome, effectuant des t\u00e2ches sans intervention de l'utilisateur. Il g\u00e8re g\u00e9n\u00e9ralement des fonctions au niveau du syst\u00e8me ou de l'application, am\u00e9liorant ainsi l'efficacit\u00e9. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> logs (usually found in \/var\/log\/syslog<\/code> or \/var\/log\/messages<\/code> sur les syst\u00e8mes Linux) pour toute anomalie ou erreur li\u00e9e \u00e0 Docker.<\/p>\n
      Best Practices to Prevent Unexpected Stops<\/h2>\n
      Pour minimiser le risque que les conteneurs s'arr\u00eatent de mani\u00e8re inattendue, envisagez d'adopter les meilleures pratiques suivantes :<\/p>\n
      1. Implement Robust Error Handling<\/h3>\n
      Ensure that your applications have proper error handling in place. This includes catching exceptions, validating input, and handling retries for transient errors. <\/p>\n
      2. Utilisez les contr\u00f4les de sant\u00e9 \u00e0 bon escient<\/h3>\n
      Mettez en place des v\u00e9rifications de sant\u00e9 qui refl\u00e8tent ad\u00e9quatement l'\u00e9tat de votre service<\/a><\/span>Le service fait r\u00e9f\u00e9rence \u00e0 l'acte de fournir une assistance ou un soutien pour r\u00e9pondre \u00e0 des besoins ou des exigences sp\u00e9cifiques. Dans divers domaines, il englobe le service client, le support technique et les services professionnels, en mettant l'accent sur l'efficacit\u00e9 et la satisfaction de l'utilisateur. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>. Ensure that they are appropriately configured to avoid false positives that could lead to unnecessary stops.<\/p>\n
      3. Optimize Resource Allocation<\/h3>\n
      Understand the resource requirements of your applications and allocate sufficient CPU and memory limits in your Docker Compose<\/a><\/span>Docker Compose is a tool for defining and running multi-container Docker applications using a YAML file. It simplifies deployment, configuration, and orchestration of services, enhancing development efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> files or Docker run<\/a><\/span>\"RUN\" refers to a command in various programming languages and operating systems to execute a specified program or script. It initiates processes, providing a controlled environment for task execution. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> commands. This can help prevent containers from being killed due to excessive usage.<\/p>\n
      4. Log Extensively<\/h3>\n
      Mettez en place un syst\u00e8me de journalisation (logging) au sein de vos applications et utilisez des solutions de journalisation centralis\u00e9e (comme ELK) pile<\/a><\/span>Une pile est une structure de donn\u00e9es qui fonctionne selon le principe du dernier entr\u00e9, premier sorti (LIFO), o\u00f9 l'\u00e9l\u00e9ment le plus r\u00e9cemment ajout\u00e9 est le premier \u00e0 \u00eatre retir\u00e9. Elle prend en charge deux op\u00e9rations principales : empiler et d\u00e9piler. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>, Fluentd, ou d'autres) pour capturer les journaux de mani\u00e8re centralis\u00e9e afin de faciliter le d\u00e9bogage.<\/p>\n
      5. Surveiller les conteneurs<\/h3>\n
      Use monitoring solutions (such as Prometheus, Grafana, or Datadog) to keep track of your containers\u2019 performance metrics, alerting you to any anomalies before they lead to crashes.<\/p>\n
      6. Utiliser les Politiques de red\u00e9marrage<\/h3>\n
      Docker propose des strat\u00e9gies de red\u00e9marrage int\u00e9gr\u00e9es qui peuvent red\u00e9marrer automatiquement les conteneurs dans certaines conditions. --restart<\/code> flag when running your conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> to specify your preferred policy:<\/p>\n
      docker run<\/a><\/span>\"RUN\" refers to a command in various programming languages and operating systems to execute a specified program or script. It initiates processes, providing a controlled environment for task execution. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> --restart=always <\/code><\/pre>\n
      Les politiques courantes comprennent non<\/code>, always<\/code>, sauf-arr\u00eat<\/code>, and on-failure<\/code>.<\/p>\n
      7. Effectuer des mises \u00e0 jour r\u00e9guli\u00e8res<\/h3>\n
      Gardez vos images Docker, vos conteneurs et Docker lui-m\u00eame \u00e0 jour. Les vuln\u00e9rabilit\u00e9s de s\u00e9curit\u00e9 et les bogues peuvent entra\u00eener une instabilit\u00e9.<\/p>\n
      Conclusion<\/h2>\n
      Bien que les arr\u00eats inattendus des conteneurs Docker puissent \u00eatre frustrants, comprendre les raisons sous-jacentes et adopter une approche structur\u00e9e pour le d\u00e9pannage peut att\u00e9nuer une grande partie de la douleur. En appliquant les meilleures pratiques, en maintenant une journalisation robuste et en surveillant l'utilisation des ressources, les \u00e9quipes peuvent cr\u00e9er des applications plus r\u00e9silientes et r\u00e9duire consid\u00e9rablement les temps d'arr\u00eat. <\/p>\n
      Remember, the nature of containerization is to promote rapid development and deployment; however, the complexity of modern applications requires that we remain vigilant and proactive when managing our containers. With a deep understanding of Docker\u2019s mechanics and a commitment to best practices, you can ensure smoother operation and better reliability for your containerized applications.<\/p>","protected":false},"excerpt":{"rendered":"
      Inattendu conteneur<\/a><\/span>Containers are lightweight, portable units that encapsulate software and its dependencies, enabling consistent execution across different environments. They leverage OS-level virtualization for efficiency. More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> shutdowns can disrupt operations and lead to data loss. Common causes include resource exhaustion, configuration errors, and external dependencies. Understanding these factors is crucial for effective troubleshooting.<\/p>","protected":false},"author":1,"featured_media":752,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-464","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-container-creation-and-management"],"yoast_head":"\nUnderstanding the Causes of Unexpected Container Shutdowns - Dockerpros<\/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:\/\/dockerpros.com\/fr\/creation-et-gestion-de-conteneurs\/understanding-the-causes-of-unexpected-container-shutdowns\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Understanding the Causes of Unexpected Container Shutdowns - Dockerpros\" \/>\n<meta property=\"og:description\" content=\"Unexpected container shutdowns can disrupt operations and lead to data loss. 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