Un jour vous pouvez resté bloqué par un mot de passe perdu pour accéder à Webmin et vous auriez besoin d’un moyen de le changer.
Voici comment: pour commencer, connectez-vous à votre système en ssh.Vous devez trouver où Webmin est installé et donc le chemin que le script utilisera pour réinitialiser le mot de passe. Lire la suite…
Source: OSXdaily
Private Eye is a free real-time network monitor app for Mac OS X that is extremely easy to use. Upon launching the app, you’ll start to see all open network connections by application and process, and you can then filter connections by app, monitor all open connections, or watch only incoming or outgoing transfer.
Connections are reported by application, the time of the connection, and arguably the most useful, the IP address that is being connected to by the app, making it easy to see socket and routing data, letting you know exactly what app is communicating with what server or IP address, for both local and broader internet networks. If you have any interest in networking, privacy, security, or you just want to keep an eye on what apps are connecting to the internet and to where, you should download this app, but it’s also an amazingly useful tool for troubleshooting network problems and figuring out what is using the network.
Download and install Private Eye by putting it into your /Applications/ folder, then open PrivateEye to get started. The list of open network connections is easy to read, you’ll see a time stamp of the connection, the application name, and where the connection is going to by IP (or coming from, as determined by the arrow pointing left for in, or right for out).
Using the left side menu you can quickly break down connections to see them all, only show incoming transfers, outgoing connections, or display connections by specific application only. Apps are easy to identify in this list, as are daemons running in the background (like PubSubAgent), and command line processes belonging to the user are also visible (ssh, for example).
This is a simple yet powerful tool without the complexity or the learning curves related to compiling and using the command line tools lsof, watch, open_ports, or wireshark, and is therefore highly recommended for anyone who is interested in seeing this kind of information, whether it’s out of general curiosity, or to help troubleshoot and diagnose specific network activities.
Source: l’admin sous GNU/Linux – blog libre
Voici une procédure permettant de contrôler l’activité d’un serveur de messagerie postfix via Nagios / Centreon.
Pour cela nous allons utiliser le plugins check_mailstat.pl avec une petite adaptation du script afin de le rendre compatible avec la génération de graphe sous Centreon.
Le plugin check_mailstat.pl va récupérer depuis des données depuis mailgraph qui permet de générer des graphes via RRDTool
Tout d’abord, il faut installer Mailgraph sur l’hôte à superviser, ici une Debian.
aptitude install mailgraph
Si l’installation ne vous a pas poser les questions propres au paramétrage, lancer :
dpkg-reconfigure mailgraph
Voici les questions et réponse à fournir :
Mailgraph doit-il être lancé au démarrage ? OUI
Fichier de journalisation à utiliser par mailgraph : /var/log/mail.log (à adapter)
Faut-il compter les courriels entrants comme des courriels sortants ? NON (J’utilise Amavis, donc j’ai choisi cette option, encore une fois à adapter.