{"id":1415,"date":"2024-07-23T12:39:41","date_gmt":"2024-07-23T12:39:41","guid":{"rendered":"https:\/\/dockerpros.com\/?post_type=glossary&#038;p=1415"},"modified":"2024-07-23T12:39:41","modified_gmt":"2024-07-23T12:39:41","slug":"maintenance-du-cache-dockerfile","status":"publish","type":"glossary","link":"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile-cache-maintenance\/","title":{"rendered":"Dockerfile \u2013maintenance du cache"},"content":{"rendered":"<h1>Compr\u00e9hension <code>--cache-maintenance<\/code> dans les Dockerfiles : Bonnes pratiques pour les utilisateurs avanc\u00e9s<\/h1>\n<p>In the realm of containerization, Docker has emerged as a pivotal tool for developers and systems architects, allowing for the creation, deployment, and management of applications in isolated environments. One of the core features of Docker is its build caching mechanism, which optimizes the process of creating Docker images by reusing previously built layers when possible. The <code>--cache-maintenance<\/code> flag is a relatively new addition to Docker\u2019s fleet of build options, specifically aimed at enhancing the management of this caching behavior. This article delves into the intricacies of the <code>--cache-maintenance<\/code> option, en explorant ses fonctionnalit\u00e9s, ses avantages, les meilleures pratiques d'utilisation et comment elle peut \u00eatre exploit\u00e9e pour une efficacit\u00e9 optimale. <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> management.<\/p>\n<h2>The Fundamentals of Docker Caching<\/h2>\n<p>Avant d'entrer dans les d\u00e9tails de <code>--cache-maintenance<\/code> Il est crucial de comprendre les principes sous-jacents du m\u00e9canisme de cache de Docker. Lorsque vous construisez une image Docker... <span class=\"glossaryai-tooltip glossary-term-651\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\" target=\"_blank\">image<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">Une image est une repr\u00e9sentation visuelle d'un objet ou d'une sc\u00e8ne, g\u00e9n\u00e9ralement compos\u00e9e de pixels dans les formats num\u00e9riques. Elle peut transmettre des informations, susciter des \u00e9motions et faciliter la communication \u00e0 travers diff\u00e9rents m\u00e9dias.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> \u00e0 partir d'un <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>, Docker breaks down the <span class=\"glossaryai-tooltip glossary-term-651\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\" target=\"_blank\">image<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">Une image est une repr\u00e9sentation visuelle d'un objet ou d'une sc\u00e8ne, g\u00e9n\u00e9ralement compos\u00e9e de pixels dans les formats num\u00e9riques. Elle peut transmettre des informations, susciter des \u00e9motions et faciliter la communication \u00e0 travers diff\u00e9rents m\u00e9dias.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> creation process into discrete steps, each generating a layer. Each of these layers can be reused in subsequent builds if the instructions and the context (files, environment variables, etc.) remain unchanged. <\/p>\n<h3>Layer Caching<\/h3>\n<p>Docker employs a layer caching mechanism to enhance performance. When a <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> is built, Docker checks whether it can reuse any of the existing layers from previous builds. If a layer hasn\u2019t changed, Docker will use the cached version, allowing it to skip the build step entirely. This not only speeds up the build process but also optimizes resource usage, as unchanged layers don\u2019t need to be rebuilt.<\/p>\n<h3>Invalidation du cache<\/h3>\n<p>However, cache invalidation is an inherent complexity within this process. Any modification to a preceding instruction in the <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> or the context will invalidate all subsequent layers, causing Docker to rebuild them. This can lead to longer build times and can sometimes lead to developers not using the cache effectively due to unintentional changes in the <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>.<\/p>\n<h2>Introducing <code>--cache-maintenance<\/code><\/h2>\n<p>The <code>--cache-maintenance<\/code> Ce drapeau est con\u00e7u pour am\u00e9liorer la fa\u00e7on dont Docker g\u00e8re le cache lors des builds. Cette option introduit un contr\u00f4le plus pr\u00e9cis sur le m\u00e9canisme de cache, permettant aux d\u00e9veloppeurs de maintenir leur cache efficace et propre tout en minimisant les reconstructions inutiles.<\/p>\n<h3>But de <code>--cache-maintenance<\/code><\/h3>\n<p>Le but principal de l' <code>--cache-maintenance<\/code> L'option permet de maintenir l'int\u00e9grit\u00e9 et l'efficacit\u00e9 des couches de cache tout au long du processus de construction. Lorsqu'elle est utilis\u00e9e, cette option invite Docker \u00e0 effectuer une s\u00e9rie d'op\u00e9rations visant \u00e0 nettoyer les couches de cache obsol\u00e8tes ou inutilis\u00e9es qui peuvent occuper un espace pr\u00e9cieux. Ce processus de nettoyage est particuli\u00e8rement important dans les environnements o\u00f9 des processus d'int\u00e9gration et de d\u00e9ploiement continus sont en place, car les artefacts de construction peuvent s'accumuler rapidement.<\/p>\n<h2>Caract\u00e9ristiques principales de <code>--cache-maintenance<\/code><\/h2>\n<h3>1. Enhanced Cleanup Operations<\/h3>\n<p>One of the standout features of the <code>--cache-maintenance<\/code> Cette option se concentre sur le nettoyage. Elle peut \u00eatre particuli\u00e8rement b\u00e9n\u00e9fique dans les constructions multi-\u00e9tapes, o\u00f9 les couches des \u00e9tapes pr\u00e9c\u00e9dentes peuvent devenir irrelevantes dans les \u00e9tapes ult\u00e9rieures. En activant ce drapeau, les d\u00e9veloppeurs peuvent s'assurer que ces anciennes couches sont nettoy\u00e9es et ne consomment pas inutilement de l'espace disque.<\/p>\n<h3>2. Improved Build Performance<\/h3>\n<p>En maintenant un cache plus propre, le processus de construction peut devenir plus rapide et plus efficace. Lorsque Docker doit g\u00e9rer moins de couches et de d\u00e9bris, il peut se concentrer sur les t\u00e2ches principales, ce qui entra\u00eene des temps de construction plus rapides et une consommation de ressources moindre.<\/p>\n<h3>3. Cache Integrity<\/h3>\n<p>Cache integrity is critical for ensuring reliable builds, especially in production settings. The <code>--cache-maintenance<\/code> flag helps in removing stale or conflicting cache layers, which can lead to unpredictable behaviors in applications. By ensuring that only valid and relevant layers are present, developers can achieve a more stable build pipeline.<\/p>\n<h2>Meilleures pratiques pour l'utilisation <code>--cache-maintenance<\/code><\/h2>\n<p>To make the most of the <code>--cache-maintenance<\/code> En adoptant certaines bonnes pratiques, on peut consid\u00e9rablement am\u00e9liorer la gestion des constructions Docker.<\/p>\n<h3>1. Regularly Incorporate <code>--cache-maintenance<\/code><\/h3>\n<p>Pour les projets qui subissent des mises \u00e0 jour ou des modifications fr\u00e9quentes, il est important d'incorporer r\u00e9guli\u00e8rement les <code>--cache-maintenance<\/code> L'int\u00e9gration de l'option --no-cache dans le processus de construction peut aider \u00e0 g\u00e9rer efficacement le cache. Cela devrait faire partie de votre pipeline CI\/CD ou de vos scripts de construction pour garantir que vos constructions restent efficaces et propres.<\/p>\n<h3>2. Combiner avec d'autres options de compilation<\/h3>\n<p>En utilisant <code>--cache-maintenance<\/code> en conjonction avec d'autres options de construction Docker peut davantage optimiser les performances de construction. Par exemple, en l'utilisant avec <code>--no-cache<\/code> during specific builds where you want to ensure a completely fresh build can help manage your layers better. <\/p>\n<h3>3. Monitor Cache Usage<\/h3>\n<p>Monitoring cache usage helps in understanding how layers are being utilized over time. By implementing logging and analysis tools, developers can gather insights on how effective the caching mechanism is working. This can inform decisions on when to invoke the <code>--cache-maintenance<\/code> drapeau.<\/p>\n<h3>4. Optimize Dockerfile Instructions<\/h3>\n<p>Optimizing <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> instructions can significantly reduce the need for extensive cache maintenance. For instance, ensuring that frequently changing instructions (like <code><span class=\"glossaryai-tooltip glossary-term-673\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/copy\/\" target=\"_blank\">COPIE<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">COPY is a command in computer programming and data management that facilitates the duplication of files or data from one location to another, ensuring data integrity and accessibility.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/copy\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span><\/code> or <code><span class=\"glossaryai-tooltip glossary-term-672\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/run\/\" target=\"_blank\">RUN<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">\"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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/run\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span><\/code>) are placed towards the end of the <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> can minimize cache invalidation, thereby reducing the frequency with which the <code>--cache-maintenance<\/code> le drapeau doit \u00eatre utilis\u00e9.<\/p>\n<h3>5. Utilize Multi-Stage Builds<\/h3>\n<p>Multi-stage builds can be an effective way to manage your <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> layers. By splitting the build process into multiple stages, unnecessary layers can be eliminated early on. This approach not only streamlines the final <span class=\"glossaryai-tooltip glossary-term-651\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\" target=\"_blank\">image<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">Une image est une repr\u00e9sentation visuelle d'un objet ou d'une sc\u00e8ne, g\u00e9n\u00e9ralement compos\u00e9e de pixels dans les formats num\u00e9riques. Elle peut transmettre des informations, susciter des \u00e9motions et faciliter la communication \u00e0 travers diff\u00e9rents m\u00e9dias.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> but also allows the <code>--cache-maintenance<\/code> drapeau pour se concentrer sur le nettoyage des \u00e9tapes qui ne sont plus n\u00e9cessaires.<\/p>\n<h2>Common Scenarios for Using <code>--cache-maintenance<\/code><\/h2>\n<p>Comprendre quand utiliser le <code>--cache-maintenance<\/code> option can help streamline workflows and maintain a robust Docker environment.<\/p>\n<h3>Scenario 1: Continuous Integration Pipelines<\/h3>\n<p>In continuous integration (CI) environments, where builds are triggered frequently, the accumulation of cache layers can lead to bloated resources. Incorporating <code>--cache-maintenance<\/code> dans le cadre de votre pipeline CI peut garantir que les couches obsol\u00e8tes sont r\u00e9guli\u00e8rement purg\u00e9es, ce qui conduit \u00e0 des builds plus propres et plus efficaces.<\/p>\n<h3>Scenario 2: Frequent Dockerfile Changes<\/h3>\n<p>If your team frequently updates the <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span>, utilizing the <code>--cache-maintenance<\/code> flag can help maintain a clean cache and reduce the risk of introducing issues due to stale layers. This is especially critical in agile environments where fast-paced development is crucial.<\/p>\n<h3>Scenario 3: Large Applications<\/h3>\n<p>For large applications that consist of multiple dependencies and layers, the <code>--cache-maintenance<\/code> flag can be used strategically to manage the increased complexity of caching. It can help keep the <span class=\"glossaryai-tooltip glossary-term-651\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\" target=\"_blank\">image<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">Une image est une repr\u00e9sentation visuelle d'un objet ou d'une sc\u00e8ne, g\u00e9n\u00e9ralement compos\u00e9e de pixels dans les formats num\u00e9riques. Elle peut transmettre des informations, susciter des \u00e9motions et faciliter la communication \u00e0 travers diff\u00e9rents m\u00e9dias.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> size manageable and improve build times by cleaning up layers that are no longer needed.<\/p>\n<h2>Conclusion<\/h2>\n<p>The <code>--cache-maintenance<\/code> option in Docker offers an advanced mechanism for managing cache layers effectively within Docker builds. By understanding its functionalities, leveraging its benefits, and adopting best practices, developers can enhance their build processes, optimize resource usage, and ensure that their applications are built against clean and reliable layers. As Docker continues to evolve, embracing such features can provide significant advantages in maintaining efficient development and deployment workflows. By implementing smart cache management strategies, teams can reduce build times, improve reliability, and streamline their operational processes in the ever-evolving landscape of software development.<\/p>","protected":false},"excerpt":{"rendered":"<p>L'option `\u2013cache-maintenance` dans <span class=\"glossaryai-tooltip glossary-term-652\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\" target=\"_blank\">Dockerfile<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">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.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/dockerfile\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> optimise <span class=\"glossaryai-tooltip glossary-term-651\"><span class=\"glossaryai-link\"><a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\" target=\"_blank\">image<\/a><\/span><span class=\"gai-content-hidden glossaryai-tooltip-content\"><span class=\"gai-tooltip-body\"><span class=\"glossaryai-tooltip-text\">Une image est une repr\u00e9sentation visuelle d'un objet ou d'une sc\u00e8ne, g\u00e9n\u00e9ralement compos\u00e9e de pixels dans les formats num\u00e9riques. Elle peut transmettre des informations, susciter des \u00e9motions et faciliter la communication \u00e0 travers diff\u00e9rents m\u00e9dias.<span class=\"glossaryai-more-link\"> <a href=\"https:\/\/dockerpros.com\/fr\/wiki\/image\/\">More \u00bb<\/a><\/span><\/span><\/span><\/span><\/span> en g\u00e9rant la mise en cache des couches. Cela permet une r\u00e9utilisation efficace des couches inchang\u00e9es, r\u00e9duisant ainsi les temps de construction et la consommation de ressources dans les flux de travail CI\/CD.<\/p>","protected":false},"author":1,"featured_media":2143,"parent":0,"template":"","glossary-cat":[],"class_list":["post-1415","glossary","type-glossary","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dockerfile -cache-maintenance - 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\/wiki\/maintenance-du-cache-dockerfile\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dockerfile -cache-maintenance - Dockerpros\" \/>\n<meta property=\"og:description\" content=\"The `--cache-maintenance` flag in Dockerfile optimizes image building by managing layer caching. 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