Nmap allows you to scan your server for open ports or detect which OS is being used. But you could also use this for SQL injection vulnerabilities, network discovery and other means related to penetration testing. MTR combines the functionality of traceroute and the ping tool into a single network diagnostic tool. When using the tool it will limit the number hops individual packets has to travel while also listening to their expiry.
It then repeats this every second. You can also save the this data for further analysis. Justniffer is a tcp packet sniffer. You can choose whether you would like to collect low-level data or high-level data with this sniffer. It also allows you to generate logs in customizable way. You could for instance mimic the access log that apache has. Our server monitoring tool! It has a web interface that allows you to set alerts and view graphs for all system and network metrics. You can also set up monitoring of websites whether they are up or down.
Server Density allows you to set permissions for users and you can extend your monitoring with our plugin infrastructure or api. The service already supports Nagios plugins.
OpenNMS has four main functional areas: event management and notifications; discovery and provisioning; service monitoring and data collection. SysUsage monitors your system continuously via Sar and other system commands. It also allows notifications to alarm you once a threshold is reached.
SysUsage itself can be run from a centralized place where all the collected statistics are also being stored. It has a web interface where you can view all the stats. PCP has the capability of collating metrics from multiple hosts and does so efficiently. It also has a plugin framework so you can make it collect specific metrics that is important to you. You can access graph data through either a web interface or a GUI. Good for monitoring large systems. This tool is both a system monitor and task manager. You can view server metrics from several machines through the worksheet and if a process needs to be killed or if you need to start a process it can be done within KDE system guard.
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Munin is both a network and a system monitoring tool which offers alerts for when metrics go beyond a given threshold. It uses RRDtool to create the graphs and it has web interface to display these graphs. Its emphasis is on plug and play capabilities with a number of plugins available. Nagios is system and network monitoring tool that helps you monitor monitor your many servers.
It has support for alerting for when things go wrong. It also has many plugins written for the platform. Zenoss provides a web interface that allows you to monitor all system and network metrics. Moreover it discovers network resources and changes in network configurations. It has alerts for you to take action on and it supports the Nagios plugins. And one for luck! Cacti is network graphing solution that uses the RRDtool data storage.
It allows a user to poll services at predetermined intervals and graph the result. Cacti can be extended to monitor a source of your choice through shell scripts. Zabbix is an open source infrastructure monitoring solution. It can use most databases out there to store the monitoring statistics. You can display CPU, memory, network, filesystems, top processes.
The data can also be added to a RRD database for further analysis. Conky monitors a plethora of different OS stats. For the handy person you could extend it with your own scripts or programs using Lua. Glances monitors your system and aims to present a maximum amount of information in a minimum amount of space. It also has a web interface. Saidar is a very small tool that gives you basic information about your system resources.
It displays a full screen of the standard system resources. The emphasis for saidar is being as simple as possible. This tool provides a way to extract RRD data in a graphical format. Monit has the capability of sending you alerts as well as restarting services if they run into trouble. Linux process explorer is akin to the activity monitor for OSX or the windows equivalent.
It aims to be more usable than top or ps. You can view each process and see how much memory usage or CPU it uses. Discus is similar to df however it aims to improve df by making it prettier using fancy features as colors, graphs and smart formatting of numbers. Dstat aims to be a replacement for vmstat, iostat, netstat and ifstat. It allows you to view all of your system resources in real-time.
The data can then be exported into csv. Most importantly dstat allows for plugins and could thus be extended into areas not yet known to mankind. Incron allows you to monitor a directory tree and then take action on those changes. Monitorix is lightweight system monitoring tool. It helps you monitor a single machine and gives you a wealth of metrics. It also has a built-in HTTP server to view graphs and a reporting mechanism of all metrics. This small command that quickly gives you information about how long the machine has been running, how many users currently are logged on and the system load average for the past 1, 5 and 15 minutes.
The most common command is using mpstat -P ALL which gives you the usage of all the cores. You can also get an interval update of the CPU usage. You can use this command to find out causes of memory bottlenecks. The ps command will give you an overview of all the current processes. You can easily select all processes using the command ps -A. Similar to sar collectl collects performance metrics for your machine.
By default it shows cpu, network and disk stats but it collects a lot more. The difference to sar is collectl is able to deal with times below 1 second, it can be fed into a plotting tool directly and collectl monitors processes more extensively. This is a built-in command that displays the total amount of free and used physical memory on your machine.
It also displays the buffers used by the kernel at that given moment. The proc file system gives you a peek into kernel statistics. From these statistics you can get detailed information about the different hardware devices on your machine. Take a look at the full list of the proc file statistics. GKrellm is a gui application that monitor the status of your hardware such CPU, main memory, hard disks, network interfaces and many other things.
It can also monitor and launch a mail reader of your choice. Gnome system monitor is a basic system monitoring tool that has features looking at process dependencies from a tree view, kill or renice processes and graphs of all server metrics. A demo of Nagios Core can be downloaded from here. Meridian can be thought of as the stable release of OpenNMS, which changes very seldomly, and is advisable to enterprises that need stability and functionality. Horizon is more of an experimental version of OpenNMS, which innovates often, and includes experimental functionality that has unknown factors that are not necessarily suitable for production environments.
Whichever version of OpenNMS you decide on, there are some features that you can expect to use straight out of the box. The software platform is able to detect service outages such as latency and performance graphing, as well as synthetic bench-marking for network performance analysis.
There is default application template support, so you can monitor popular applications without having to do too much configuration to get your monitoring system setup. System administrators will be pleased to know that they can monitor all device types, from Windows PCs and servers, to Linux based systems, as well as network appliances such as switches and routers.
The OpenNMS system installs onto a Linux server, and runs continuously while scanning your environment for data. OpenNMS also offers great alert and warning functionality, which notifies you about any threshold exceeding events, such as non-responsive devices or bandwidth allocation overutilization. This means that you will never be caught completely unaware if any devices or systems fail on your network, making OpenNMS a compelling choice for IT professionals.
The latest version of OpenNMS can be downloaded from here. Zenoss Core is an on-premises, self-managed, community supported monitoring solution that runs on a Linux platform, and offers stability, scalability, and excellent monitoring features. It provides users with event management, basic monitoring, a unified monitoring solution, limited root-cause analysis, reports, and more. The Zenoss Core product can monitor up to devices, but other versions such as Zenoss On Premises, or Zenoss Cloud, can provide monitoring for , devices, and unlimited numbers for the cloud version.
This means that your team can stay on the same wave-length, and measure the same metrics.
This reduces the overall complexities of the troubleshooting phase of support, and results in faster issue resolution. The kinds of events that can be monitored are almost limitless, with anything from chassis intrusion detection, to Linux and Microsoft monitoring, to hard drive and fan speeds and health. Zenoss can be as localized, or as global as you need your monitoring to be. It allows your planning team to gain valuable information about the current state of your networks, both local and wide, giving them the information that they need to plan, maintain, and support the existing infrastructure.
Local workstations and servers can be actively monitored , while switches and routers can be added to the alert and notification feature, giving your team real time feedback on issues as and when they occur. Zenoss makes visualizing your network very easy by giving proper tools that trace out the network path for each class of these devices. Data logs and system logs are all accessible from one centralized location, which gives you all of the tools that you need to investigate suspicious activity on your network, and compile a comprehensive report about any anomalies that may be occurring in your environment.
Schedule a demo here. Pricing: Pricing is available on request, and can be asked for from here. Not all monitoring applications need to be an entire suite of applications. Some of the older monitoring solutions that were used in Linux environments from many years ago are still being maintained and updated by the developers.
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These can be downloaded and used where more modern monitoring systems are not feasible. We have a list of some of these that you can look at for your own network, depending on your requirements. Cacti has been around for a very long time, and is a monitoring solution that many Linux admins and open source enthusiasts will be familiar with.
This data can then be queries via SQL commands. The Frontend relies on PHP, and can be made to create graphs, charts and data sources. In any event, Cacti handles all othe data gathering. Cacti is able to handle this massive data collection by using multiple paths, and can correlate with the data on the graph that it is creating.
The graph creation is therefore unlimited, and the items that need to be tracked can be represented graphically. Cacti can therefore be seen as more of a logging tool, but it is definitely still useful for troubleshooting. This also allows for specialized monitoring, although customizing these graphs can take a little bit of practice. Overall, Cacti is still a valuable graphing and monitoring tool, especially down at a protocol level, where specific data is required to compile comprehensive reports. The fact that it is well supported by a large community, runs on Linux, and it is free and open source, makes it a worthy tool to look into for system admins.
It is a derivative of ntop, which is a network traffic probe that monitors any and all network traffic. Ntopng has been created with a basis in libpcap, which is portable, making this a tool that can run on a system without requiring compilation or installing.
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Its main features are related to network traffic sorting, and criteria can be chosen and viewed from here. IP addresses, ports, L8 protocol, throughput , autonomous systems and more can be viewed from within this platform. This assists with generating network traffic in real time, which gives your IT team a detailed view of the current network environment at a glance.
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The user interface is clean and easy to navigate, and it generates clean graphics that are clear and detailed. Those wishing to download NtoPNG can get it from here. Htop is another version of the famous process viewer for Unix systems, top. This particular version is a text-mode application that runs on Linux and Unix systems with console or X terminal.
It is able to do this by using ncurses, which is text based.
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The overall aesthetic of this application is that of an old school terminal, so is not as visually informative as a graphical interface might be at a glance, but for some people, it could be quite useful. For those that are looking to download Htop, they can find the link to the download packages here.
Ibmonitor is another interactive Linux console that can show valuable information about your network. Its main features allow users to view received, transmitted, and total bandwidth usage for specific interfaces, it can calculate and display the combined values of all interfaces. Users can display the total data transferred per interface. Values can be displayed different size ranges, so you can customize the range to accommodate your particular needs.
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While this application can be seen as more of a legacy styled monitoring tool, there are some older environments that run hardware that could benefit from terminal based applications. Users that are looking to download ibmonitor can download it from here. BMW-NG is a bandwidth monitoring solution that is currently in its beta phase. It is able to monitor network and hard disk activity, and keep track of this information in a light weight, compact application.
This is a very straight forward and simple logging tool, and while it is certainly useful, its usefulness will depend entirely on what you are trying to monitor, and for how many targets. Its beta status might also be a detracting factor for some people, especially for those that are in a production environment. Dstat is a versatile and lightweight replacement application for vmstat, iostat, netstat and ifstat. Dstat is able to surpass many of the limiting functionalities that these older applications were faced with by adding modern features, such as more counters, and greater flexibility.
Dstat is able to give users a view of system resources in real time, which is a great tool for system administrators. This is a useful tool for system admins that need to visualize their information from wihin a non-graphical command line. There is a wealth of information available for system admins to gain a better understanding of what is running on the network. Monitorix is a free, open source, lightweight system monitoring tool that has been created to monitor multiple services and system resources on a single Linux machine, normally a server.
It is able to do all of this by accessing valuable system logs and records within the Linux operating system, compiling them all in a graphical format that can be viewed from another PC or device that supports HTML. Some examples of features that Monitorix can keep you informed about are: system load, active processes, memory allocation, system entropy, system uptime, and other local performance indicators.
IPTraf is a legacy app that is somewhat dormant these days, as the last update that was launched was back in September of It is a non-graphical application, that uses command based information and statistics to keep you informed about what you specific system is currently busy with. This allows you to keep updated with what your system is busy with.
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This is a valuable piece of software on older systems that are still active, but cannot run in a graphical mode.
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