{"id":2072,"date":"2026-03-12T17:19:55","date_gmt":"2026-03-12T16:19:55","guid":{"rendered":"https:\/\/askem.eu\/?p=2072"},"modified":"2026-03-12T17:19:57","modified_gmt":"2026-03-12T16:19:57","slug":"observabilite-open-source-surveiller-son-infrastructure-avec-prometheus-grafana-et-loki","status":"publish","type":"post","link":"https:\/\/askem.eu\/en\/2026\/03\/12\/observabilite-open-source-surveiller-son-infrastructure-avec-prometheus-grafana-et-loki\/","title":{"rendered":"Observabilit\u00e9 open source : surveiller son infrastructure avec Prometheus, Grafana et Loki"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Observabilit\u00e9 open source&nbsp;: surveiller son infrastructure avec Prometheus, Grafana et Loki<\/h2>\n\n\n\n<p>D\u00e9ployer des services, c&rsquo;est bien. Savoir ce qui s&rsquo;y passe en temps r\u00e9el, c&rsquo;est mieux. L&rsquo;observabilit\u00e9 \u2014 m\u00e9triques, logs et traces \u2014 est le pilier souvent n\u00e9glig\u00e9 d&rsquo;une infrastructure auto-h\u00e9berg\u00e9e. Cet article pr\u00e9sente une stack d&rsquo;observabilit\u00e9 enti\u00e8rement open source, d\u00e9ployable en quelques conteneurs, pour reprendre le contr\u00f4le sur la visibilit\u00e9 de vos services.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pourquoi l&rsquo;observabilit\u00e9 est indispensable<\/h2>\n\n\n\n<p>Quand on g\u00e8re ses propres serveurs \u2014 Nextcloud, Keycloak, CKAN, Gitea \u2014 il est tentant de ne r\u00e9agir qu&rsquo;aux pannes. Mais sans m\u00e9triques ni logs centralis\u00e9s, chaque incident devient une enqu\u00eate aveugle. L&rsquo;observabilit\u00e9 permet de passer d&rsquo;un mode r\u00e9actif \u00e0 un mode proactif&nbsp;: d\u00e9tecter les anomalies avant qu&rsquo;elles ne deviennent des pannes, comprendre les tendances de consommation, et documenter le comportement r\u00e9el de l&rsquo;infrastructure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les trois piliers&nbsp;: m\u00e9triques, logs, traces<\/h2>\n\n\n\n<p>L&rsquo;observabilit\u00e9 repose sur trois types de donn\u00e9es compl\u00e9mentaires&nbsp;:<\/p>\n\n\n\n<p><strong>Les m\u00e9triques<\/strong> sont des valeurs num\u00e9riques \u00e9chantillonn\u00e9es dans le temps&nbsp;: utilisation CPU, m\u00e9moire, nombre de requ\u00eates HTTP, latence. Elles r\u00e9pondent \u00e0 la question  \u00ab&nbsp;est-ce que \u00e7a va&nbsp;?&nbsp;\u00bb et permettent de poser des alertes.<\/p>\n\n\n\n<p><strong>Les logs<\/strong> sont les messages textuels \u00e9mis par les applications. Centralis\u00e9s et index\u00e9s, ils permettent de comprendre le  \u00ab&nbsp;pourquoi&nbsp;\u00bb quand quelque chose dysfonctionne.<\/p>\n\n\n\n<p><strong>Les traces<\/strong> suivent le parcours d&rsquo;une requ\u00eate \u00e0 travers plusieurs services. Elles sont essentielles dans une architecture de microservices pour identifier les goulets d&rsquo;\u00e9tranglement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La stack propos\u00e9e<\/h2>\n\n\n\n<p>Voici une stack coh\u00e9rente, enti\u00e8rement open source et auto-h\u00e9bergeable&nbsp;:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Prometheus<\/strong> \u2014 collecte et stockage des m\u00e9triques. Il fonctionne en mode pull&nbsp;: il interroge p\u00e9riodiquement les endpoints <code>\/metrics<\/code> expos\u00e9s par vos services. Sa configuration est d\u00e9clarative et son mod\u00e8le de donn\u00e9es (s\u00e9ries temporelles avec labels) est devenu un standard de fait.<\/li>\n\n\n\n<li><strong>Grafana<\/strong> \u2014 visualisation et tableaux de bord. Il se connecte \u00e0 Prometheus, Loki et d&rsquo;autres sources pour cr\u00e9er des dashboards lisibles et partageables. La communaut\u00e9 propose des centaines de dashboards pr\u00eats \u00e0 l&#8217;emploi pour les services courants (Nginx, PostgreSQL, Docker, Node Exporter).<\/li>\n\n\n\n<li><strong>Loki<\/strong> \u2014 agr\u00e9gation de logs. Con\u00e7u par l&rsquo;\u00e9quipe Grafana, Loki adopte une approche l\u00e9g\u00e8re&nbsp;: il indexe les labels des logs, pas leur contenu complet, ce qui le rend \u00e9conome en ressources compar\u00e9 \u00e0 Elasticsearch.<\/li>\n\n\n\n<li><strong>Promtail<\/strong> \u2014 agent de collecte de logs qui envoie les flux vers Loki. Il s&rsquo;installe comme sidecar ou en daemon et sait lire les logs Docker nativement.<\/li>\n\n\n\n<li><strong>Node Exporter<\/strong> \u2014 expose les m\u00e9triques syst\u00e8me (CPU, RAM, disque, r\u00e9seau) au format Prometheus. Un incontournable pour surveiller l&rsquo;h\u00f4te lui-m\u00eame.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">D\u00e9ploiement avec Docker Compose<\/h2>\n\n\n\n<p>L&rsquo;ensemble de la stack tient dans un seul fichier <code>docker-compose.yml<\/code>. Voici la structure typique&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>services:\n  prometheus:\n    image: prom\/prometheus:latest\n    volumes:\n      - .\/prometheus.yml:\/etc\/prometheus\/prometheus.yml\n      - prometheus_data:\/prometheus\n    ports:\n      - \"9090:9090\"\n\n  grafana:\n    image: grafana\/grafana:latest\n    volumes:\n      - grafana_data:\/var\/lib\/grafana\n    ports:\n      - \"3000:3000\"\n    environment:\n      - GF_SECURITY_ADMIN_PASSWORD=changeme\n\n  loki:\n    image: grafana\/loki:latest\n    ports:\n      - \"3100:3100\"\n\n  promtail:\n    image: grafana\/promtail:latest\n    volumes:\n      - \/var\/log:\/var\/log\n      - \/var\/lib\/docker\/containers:\/var\/lib\/docker\/containers:ro\n      - .\/promtail.yml:\/etc\/promtail\/config.yml\n\n  node-exporter:\n    image: prom\/node-exporter:latest\n    ports:\n      - \"9100:9100\"\n    pid: host\n    volumes:\n      - \/proc:\/host\/proc:ro\n      - \/sys:\/host\/sys:ro\n\nvolumes:\n  prometheus_data:\n  grafana_data:<\/code><\/pre>\n\n\n\n<p>En quelques minutes, vous disposez d&rsquo;un syst\u00e8me de monitoring complet, accessible via Grafana sur le port 3000.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Configuration de Prometheus<\/h2>\n\n\n\n<p>Le fichier <code>prometheus.yml<\/code> d\u00e9clare les cibles \u00e0 scraper&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>global:\n  scrape_interval: 15s\n\nscrape_configs:\n  - job_name: 'node'\n    static_configs:\n      - targets: &#91;'node-exporter:9100']\n\n  - job_name: 'prometheus'\n    static_configs:\n      - targets: &#91;'localhost:9090']<\/code><\/pre>\n\n\n\n<p>Chaque service exposant un endpoint <code>\/metrics<\/code> peut \u00eatre ajout\u00e9 comme cible. Nginx (via <code>nginx-prometheus-exporter<\/code>), PostgreSQL (via <code>postgres_exporter<\/code>) et Keycloak exposent tous des m\u00e9triques compatibles.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cr\u00e9er des alertes avec Alertmanager<\/h2>\n\n\n\n<p>Prometheus int\u00e8gre un moteur de r\u00e8gles d&rsquo;alerte. Coupl\u00e9 \u00e0 Alertmanager, il peut envoyer des notifications par email, Slack ou webhook. Un exemple de r\u00e8gle&nbsp;:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>groups:\n  - name: infra\n    rules:\n      - alert: HighMemoryUsage\n        expr: node_memory_MemAvailable_bytes \/ node_memory_MemTotal_bytes &lt; 0.1\n        for: 5m\n        labels:\n          severity: warning\n        annotations:\n          summary: \"M\u00e9moire disponible sous 10% sur {{ $labels.instance }}\"<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Bonnes pratiques<\/h2>\n\n\n\n<p><strong>Commencer petit.<\/strong> Node Exporter + Prometheus + Grafana suffisent pour d\u00e9marrer. Ajoutez Loki quand le besoin de centraliser les logs se fait sentir.<\/p>\n\n\n\n<p><strong>Utiliser les dashboards communautaires.<\/strong> Sur <a href=\"https:\/\/grafana.com\/grafana\/dashboards\/\" target=\"_blank\" rel=\"noreferrer noopener\">grafana.com\/dashboards<\/a>, importez des dashboards pr\u00eats \u00e0 l&#8217;emploi par ID. Le dashboard Node Exporter Full (ID 1860) est un classique.<\/p>\n\n\n\n<p><strong>S\u00e9curiser l&rsquo;acc\u00e8s.<\/strong> En production, placez Grafana derri\u00e8re votre reverse proxy Nginx avec authentification Keycloak (OAuth2 Proxy). Ne laissez pas Prometheus et Loki expos\u00e9s publiquement.<\/p>\n\n\n\n<p><strong>Dimensionner la r\u00e9tention.<\/strong> Par d\u00e9faut, Prometheus conserve 15 jours de donn\u00e9es. Ajustez avec <code>--storage.tsdb.retention.time<\/code> selon votre espace disque et vos besoins d&rsquo;historique.<\/p>\n\n\n\n<p><strong>\u00c9tiqueter proprement.<\/strong> Adoptez une convention de labels coh\u00e9rente d\u00e8s le d\u00e9but (environnement, service, instance). C&rsquo;est ce qui rendra vos requ\u00eates PromQL exploitables \u00e0 l&rsquo;\u00e9chelle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>L&rsquo;observabilit\u00e9 n&rsquo;est pas un luxe r\u00e9serv\u00e9 aux grandes \u00e9quipes DevOps. Avec Prometheus, Grafana et Loki, une personne seule peut mettre en place un monitoring professionnel de son infrastructure en une apr\u00e8s-midi. C&rsquo;est un investissement qui se rentabilise d\u00e8s le premier incident \u00e9vit\u00e9 \u2014 et qui transforme la gestion d&rsquo;infrastructure d&rsquo;un exercice de pompier en une pratique sereine et ma\u00eetris\u00e9e.<\/p>","protected":false},"excerpt":{"rendered":"<p>Observabilit\u00e9 open source&nbsp;: surveiller son infrastructure avec Prometheus, Grafana et Loki D\u00e9ployer des services, c&rsquo;est bien. Savoir ce qui s&rsquo;y passe en temps r\u00e9el, c&rsquo;est mieux. L&rsquo;observabilit\u00e9 \u2014 m\u00e9triques, logs et traces \u2014 est le pilier souvent n\u00e9glig\u00e9 d&rsquo;une infrastructure auto-h\u00e9berg\u00e9e. Cet article pr\u00e9sente une stack d&rsquo;observabilit\u00e9 enti\u00e8rement open source, d\u00e9ployable en quelques conteneurs, pour [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2073,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","osh_disable_topbar_sticky":"default","osh_disable_header_sticky":"default","osh_sticky_header_style":"default","osh_sticky_header_effect":"","osh_custom_sticky_logo":0,"osh_custom_retina_sticky_logo":0,"osh_custom_sticky_logo_height":0,"osh_background_color":"","osh_links_color":"","osh_links_hover_color":"","osh_links_active_color":"","osh_links_bg_color":"","osh_links_hover_bg_color":"","osh_links_active_bg_color":"","osh_menu_social_links_color":"","osh_menu_social_hover_links_color":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[18],"tags":[],"class_list":["post-2072","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-devops","entry","has-media"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Observabilit\u00e9 open source : surveiller son infrastructure avec Prometheus, Grafana et Loki - askem<\/title>\n<meta name=\"description\" content=\"ASKEM BUREAU D&#039;\u00c9TUDES ET DE FORMATION NUM\u00c9RIQUE. 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