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Connu aussi comme outil de monitoring, l’objectif d’un outil de supervision est de veiller au bon fonctionnement des systèmes d’information, d’anticiper de possibles défaillances et de rendre les systèmes toujours disponibles. Il permet au gestionnaire informatique de connaître le comportement de son parc et de savoir si des possibles dysfonctionnements pourraient nuire aux applications métier de l’entreprise.
Centreon est une référence européenne majeure des logiciels de supervision informatique professionnelle open source. En 2003 la 1ère interface utilisateur Web baptisée Oreon est développé au sein d'Epitech. Le but est de créer un moyen plus convivial de configurer et de gérer cet outil de supervision complexe ( Nagios ). Grâce à sa communauté open source, l’interface utilisateur Oreon gagne en popularité et bénéficie d’un suivi international. En 2006 Oreon devient Centreon.
L’entreprise aborde une nouvelle phase de repositionnement stratégique en 2016 à travers l’ajustement de ses offres payantes et le renforcement de ses équipes. À l'heure actuelle plusieurs formules sont disponibles pour utiliser Centreon. Depuis sa création Centreon ne cesse d'évoluer. Il est primordial de réaliser les mises à jour afin de bénéficier des derniers correctifs et des dernières fonctionnalités.
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Cet article aborde un retour d'expérience sur la mise à jour de Centreon 19.10 vers 20.04 (version sortie en juin 2020).
Pour réaliser cette mise à jour je vous conseille de suivre la documentation officielle de Centreon.
Avant toute chose, il est préférable de s’assurer de l’état et de la consistance des sauvegardes de l’ensemble des serveurs centraux de votre plate-forme :
- Serveur Centreon Central
- Serveur de gestion de base de données
Il faut savoir que Centreon 20.04 a changé son gestionnaire de tâches en passant de Centcore à Gorgone. Les statistiques Engine qui étaient collectées par Centcore le seront maintenant par Gorgone.
Également, le composant Centreon Broker a changé le format de son fichier de configuration. Il utilise maintenant JSON à la place de XML.
Si vous n'êtes pas alaise avec l'architecture de Centreon je vous recommande de suivre la documentation officielle afin de mieux comprendre le fonctionnement de Centreon.
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Le premier problème rencontré lors de la mise à jour est que les fichiers /etc/centreon-broker/central-broker.json et /etc/centreon-broker/central-rrd.json ne contenait plus les variables de connexion à la base de donnés. Il faut donc vérifier les informations de ces fichiers en fonction de votre configuration.
Le deuxieme problème rencontré est que lors d'un restart de centreon-engine j'avais cette erreur :
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Je me suis rendu compte que dans /etc/centreon-broker/ le fichier central-module.xml n'a pas été transformé en .json. J'ai donc converti le fichier au format JSON et appliqué les permissions nécessaires :
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Une fois le fichier au bon format il faut modifier la configuration de centengine afin qu'il utilise le nouveau fichier.
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Une fois ces modifications réalisées n'oubliez pas de redémarrer tous les processus.
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Personnellement j'utilise httpd et non httpd24-httpd. Il se peut donc qu'après votre authentification vous ayez une animation de chargement en continu. Il ajouter la section d'accès à l'API dans votre fichier de configuration apache. Dans mon cas /etc/httpd/conf.d/mon_site.conf
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N'oubliez pas de redémarrer votre serveur Web une fois la modification réalise.
Pour conclure je conseille fortement de réaliser un snapshot du serveur / de la vm avant de réaliser la mise à jour afin de revenir en arrière le plus vite possible et sans efforts. Cela va vous éviter de passer des heures à debugger Centreon en cas de problèmes. De plus Centreon dispose d'une grande communauté, vous pourrez donc facilement trouver ou obtenir de l'aide via leur GitHub.
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Une grande nouveauté de cette mises à jour est la page d'affichage des événements. Celle-ci est notre vue principale pour suivre les événements et l'état des ressources, les analyser et les gérer rapidement. Cette vue mélange l'hôte et les services pour avoir une interface unifiée et un moyen de gérer les événements.
Personnellement je préfère cette page puisque celle-ci respecte les designs actuels et permet d'avoir toutes les informations nécessaires plus facilement.
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