![]() Monitoring allows network admins to know what is going on in their network, be it with their WAN, LAN, VoIP, MPLS, and other connections or the state of various network elements or nodes such as the access, distribution and core switches, routers, firewalls, servers, client systems, and so on.īefore you begin with network monitoring, it is necessary to understand networking in general, as well as essentials about Windows ® systems which is the major OS used in enterprises worldwide. In spite of all the evolution that has occurred, one factor that has been constant is the need for network monitoring software. Everything was connected-to a more complex design where there are a lot more technologies, such as cloud, wireless, remote users, VPN, IoT, mobile devices, and so on. Networks have evolved from being a flat network where there were only a handful of elements. Implement High Availability with Failover Options.Hardware Monitoring – The Backbone of Network Monitoring.Thresholds, repeat-count, and time delays.Simple Network Management Protocol (SNMP).General Monitoring Techniques and Protocols.Dynamic Host Configuration Protocol (DHCP).For example, you could set up a script to send you Slack notifications, store it as /usr/local/bin/slack-webhook. Set alert since Monit has the ability to run scripts with the exec command, you can set up custom alerts however you'd like. Obviously, you'll also need to set the email address it sends to: The second line tells Monit to queue alerts, if the mail server isn't reachable for whatever reason. The easiest method would be to just use with a Gmail account, though you could install Postfix on your server to run locally, or use an enterprise email service. The first block defines the mail server to use. You'll need to add configuration for your mail server: Monit can be configured to send email alerts whenever major issues occur, or when processes are restarted. It should automatically restart if the process goes down, with no additional config, but if you want to restart based on resource usage, you'll have to specify that yourself with a few if statements: You'll need to pass Monit a command to start and stop your process. Start program = "/etc/init.d/nginx start" Usually, this is done with the processes PID file (often found in /var/run/) which stores the current PID of the running instance of that process, since the PID will change whenever the process restarts.Ĭheck process nginx with pidfile /var/run/nginx.pid Monit can then be configured to monitor individual processes. There's a few more configuration options for the web interface, but this is good for now. We'll want to lock it down to an authorized IP address andĬhange this password, of course. This is fine, but it's entirely open by default with a default password. Monit's web interface is configured to run on port 2812. If MySQL starts using too many resources, it can be restarted automatically, though you'll be warned by email first. If it goes down, it can start it again using the start program = config. Monit is configured to monitor the running MySQL process. If 3 restarts within 5 cycles then timeout If totalmem > 600 MB for 5 cycles then restart If totalmem > 400 MB for 5 cycles then alert Stop program = "/usr/sbin/service mysql stop" with timeout 60 seconds Start program = "/usr/sbin/service mysql start" with timeout 60 seconds Here's the default config for MySQL as an example: ![]() ![]() Monit defines its behavior entirely through config files. This includes relaunching crashed processes, and restarting processes using too many resources. It keeps a log of resource usage, and can take action if an error occurs. Essentially, Monit will check in on a given process every two minutes (by default) to see how it's doing.
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