Applications or appliances that observe systems and networks to find problems and notify administrators.

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79
votes
2answers
33k views

What exactly do the colors in htop status bars mean?

By default, htop shows colored status bars for processors, memory, and swap. From left to right, the bars are colored green, blue, yellow, and red depending on some thresholds. What does it mean when ...
56
votes
9answers
50k views

Shell command to monitor changes in a file - What's it called again?

I know there was a command on Unix that I could use to monitor a file and see changes that are getting written to it. This was quite useful especially for checking log files. Do you know what it is ...
31
votes
14answers
26k views

How to monitor a windows log file in real time? [closed]

There is a already question that asks about opening a large log files. But my intention is different. Is there any application that monitors a log file and updates as it is updated in real time? ...
30
votes
24answers
6k views

What are your most useful/valued Nagios plugins? [closed]

We're expanding our Nagios 3 setup, and are frequently coming across new NRPE or general Nagios plugins to test our existing infrastructure. This is in dribs and drabs though - it would be useful to ...
27
votes
6answers
17k views

A better “top” command for Mac OS X? [closed]

The top command on OS X is pretty crappy.. The one included with most Linux distros allows you to change the sort-by column using < and >, there is a coloured mode (by pressing the z key), and a ...
25
votes
3answers
3k views

Shinken - Anyone using it? [closed]

I've recently discovered Shinken, which is a new implementation of Nagios using python. Shinken "divides" Nagios in 5 different types of daemons, each one performing separated tasks. I haven't tried ...
19
votes
6answers
6k views

Colorize Monitoring of Logs

I sometimes monitor apache and php error logs using tail under FreeBSD. Is there any way to get colorized output, either using tail or some other command line app? Alternatively, what is your ...
19
votes
3answers
7k views

How i configure monit to start a process with a determinated user?

Monit runs with root, but i don't want to start my processes as root.. like mysql, mongrel, apache..
18
votes
2answers
2k views

Is there a Windows equivalent of Unix 'CPU steal time'?

In order to assess performance monitoring accuracy on virtualization platforms, the CPU steal time has become an increasingly relevant metric - see EC2 monitoring: the case of stolen CPU for an ...
17
votes
4answers
2k views

Monitoring production server

Hey all, We have 3 dedicated server, splitted in several VPS using openVZ. We're using munin to monitor the VPS with the production sites, and monit on some one of the VPS to make sure it restarts the ...
16
votes
6answers
22k views

Enable Ping in Windows Server Firewall?

I've just installed Windows Server 2008 on a server and I'm able to connect through Remote Desktop but can't ping. Do I need to open an special port on the firewall to be able to ping a server?
16
votes
5answers
7k views

monit: check process without pidfile

I'm looking for a way to kill all processes with a given name that have been running for more than X amount of time. I spawn many instances of this particular executable, and sometimes it goes into a ...
16
votes
5answers
16k views

Do SSDs support SMART?

S.M.A.R.T. (for Self-Monitoring Analysis and Reporting Technology) is a wonderful technology to detect hard drive failure before it really happens. But is S.M.A.R.T. relevant for SSDs?
16
votes
8answers
7k views

Nagios alerts by telephone?

I have a couple of nagios servers that currently alert me via SMS and email, but I'd like to add outgoing calls to that. The ideal solution would have the nagios machines call my cellphone and play an ...
16
votes
7answers
13k views

Monitor an incoming SSH session in real time

Is there any linux software to monitor an incoming ssh session. At a previous job I was told that if you ever needed support from Red Hat for example you could have them SSH into your machine and you ...
15
votes
8answers
1k views

Best practices for backup checking?

It is a common situation, when administrator makes system for automatic backuping and forgets it. Only after a system fails administrator notices, that backup system has broken before or backups are ...
15
votes
2answers
5k views

What is the difference between OpenTSDB and Graphite?

As far as I can tell, here are the main differences: OpenTSDB does not deteriorate data over time, unlike Graphite where the size of the database is pre-determined. OpenTSDB can store metrics per ...
15
votes
5answers
500 views

With virtualization, does it still make sense to use multiple mount points?

In 2013, does it make sense to still have multiple mount points on a new Linux image, or does allocating all space to / make more sense? I'd prefer to avoid the reboot required to increase the size ...
15
votes
6answers
10k views

Is Zabbix the right tool for me?

I just want to monitor a small handful of servers (less than 10). From reading various places it sounds like the top leading contenders (for open source at least) are: nagios munin zabbix From ...
15
votes
8answers
10k views

How can I see how much bandwidth each Apache Virtual Host is using?

I have Apache set up to serve several Virtual Hosts, and I would like to see how much bandwidth each site uses. I can see how much the entire server uses, but I would like more detailed reports. ...
15
votes
4answers
2k views

How to Monitor Bandwidth usage in real terms

I have a small (windows) network with a few people on it. We have internet access via a BT router Generally things are all fine, but occasionally, we seem to experience a dramatic loss of ...
14
votes
5answers
3k views

What is the best way to monitor a production server?

We are running two production servers with Apache 2 and MySQL. I am looking for a reliable way of monitoring our load, stability and uptime. I have come across monit, but are there better ...
14
votes
1answer
3k views

Get notification from supervisord when a job exits

Is there any way supervisord can automatically restart a failed/exited/terminated job and send me a notification email with a dump of the last x lines of log file?
14
votes
16answers
10k views

Real time monitoring of MS Windows servers and their services

We have a bunch of large HDTVs in our monitoring office keeping an eye on all of our production equipment. We are monitoring: Cisco routers HP switches HP proliant servers Windows 2003 IIS SQL ...
14
votes
2answers
535 views

How can I gain better insight into ISP-managed equipment (routers)?

I have a number of customers who have networking equipment managed by their ISP. This is usually in the form of an ISP-provided switch or router placed at the customer location(s). For sites that ...
13
votes
6answers
906 views

How do you monitor a monitoring server?

So we run Groundworks (with Nagios) on CentOS to monitor our various servers and processes. I have it setup to automatically send emails and SMS texts when things reach a WARNING or CRITICAL state. ...
13
votes
11answers
2k views

Server monitoring? [duplicate]

Possible Duplicate: What tool do you use to monitor your servers? is there a free, open source server monitoring tool like Nagios that runs on the MS stack? It will need to be able to ...
13
votes
4answers
1k views

Windows DHCP Server - get notification when a non-AD joined device gets an IP address

SCENARIO To simplify this down to it's easiest example: I have a Windows 2008 R2 standard DC with the DHCP server role. It hands out IPs via various IPv4 scopes, no problem there. WHAT I'D LIKE I ...
13
votes
4answers
2k views

Log transport and aggregation at scale

How're you analysing log files from UNIX/Linux machines? We run several hundred servers which all generate their own log files, either directly or through syslog. I'm looking for a decent solution to ...
12
votes
8answers
3k views

Continuosly monitor logs with tail that are occasionally rotated

We're using tail to continuously monitor several logs, but when a log is rotated the tail for that file will cease. As far as I understand, the problem is that when the log is rotated, there is a new ...
12
votes
11answers
11k views

Techniques to Monitor cron tasks?

Are there good techniques for monitoring cron tasks over a cluster? We're starting to use cron to launch tasks at daily intervals. A few ideas for checking out information: Add special application ...
12
votes
18answers
3k views

MySQL monitoring tools

What tools do you use to monitor the health of your MySQL server instance? Are they for free or commercial?
12
votes
9answers
7k views

There is any monitoring hosted solution? [closed]

I know Zabbix and Nagios, but I don't know any company that host those services for others to use. I would like to find a solution that monitored at least some of my public URLs (if they are ...
12
votes
7answers
4k views

How can I force a MySQL table to become corrupted?

I have written a simple Nagios plugin that calls mysqlcheck (which checks for corrupted tables) and will give a warning if any are corrupt. However none of my tables are corrupt now. So I'm not 100% ...
12
votes
2answers
869 views

Geographically distributed, fault-tolerant and “intelligent” application/host monitoring systems

Greetings, I'd like to ask the collectives opinion and view on distributed monitoring systems, what do you use and what are you aware of which might tick my boxes? The requirements are quite ...
12
votes
1answer
840 views

Is anyone using an SNMP and/or WMI poller to push custom metrics to Amazon CloudWatch, and if so how?

Amazon CloudWatch has a decent console, and an alarm system which uses Amazon SNS for notifications. Originally it only gave you AWS metrics, e.g. EC2 instance CPU utilization. Recently they added ...
11
votes
7answers
716 views

Uptime Monitoring Every Second - Bad For the Server?

I'm wondering if there's avantages of checking if a server is UP by doing a "HTTP GET Request" every second? Can any server handle it?
11
votes
4answers
9k views

Linux: logwatch(8) is too noisy. How can I control the noise level?

Our Linux systems run logwatch(8) utility by default. On a RedHat/CentOS/SL system, Logwatch is called by the /etc/cron.daily/ cronjob, which then sends a daily email with the results. These emails ...
11
votes
11answers
12k views

A monitoring tool that captures processes' memory usage/cpu usage, etc over time

I am looking for a way to diagnose issues, such as swap death, where a balooning memory process fills up swap and kills the whole machine (such as apache). I'm already using cacti and I can set up ...
11
votes
4answers
979 views

What am I looking for in a Monitoring Solution?

This is a Canonical Question about Monitoring Software. Also Related: What tool do you use to monitor your servers? I need to monitor my servers; what do I need to consider when deciding on ...
11
votes
1answer
2k views

Disable Monit alerts when PID changed

When you monitor a process with Monit by its pid, like : check process blop with pidfile /.../blop.pid start program = "..." stop program = "..." you get an alert when the pidfile is ...
11
votes
1answer
2k views

SNMP Deprecated in Windows Server 2012

According to Technet's Features Removed or Deprecated in Windows Server 2012, SNMP is being depreciated: SNMP is deprecated. Instead, use the Common Information Model (CIM), which is supported ...
11
votes
2answers
632 views

Snort Performance Monitoring

Using snort version 2.8.6, I am attempting to collect application performance stats such as Number of packets not processed due to application overload Percentage of time in processing layers ...
10
votes
19answers
1k views

As a system administrator, what Firefox plugin helps you do your job? [closed]

I know that there are several Firefox plugins that are invaluable for development. What plugins exist that are useful for system administration, monitoring, and the like? What plugins make your ...
10
votes
9answers
2k views

Should old servers be retired

I have servers which are still running well but are over 5 years old. They are still doing the job perfectly and there will be no advantage to upgrade the servers, should I just let them run forever ...
10
votes
6answers
406 views

Taming an existing network

I have recently joined a company as the sole IT guy and I'm struggling to get a handle on what software and hardware we own and how it is deployed. Keeping in mind my limited time and budget, what ...
10
votes
2answers
7k views

How to generate netflow data in linux

We have a number of Linux servers for which I would like to capture netflow data to be processed by a netflow analyzer. I've been spoiled by the ease in which Mikrotik routers allow netflow data ...
10
votes
5answers
13k views

How do I passively monitor the Windows Event Log?

How can I monitor the Windows Event Log remotely such that I will be informed automatically when certain events occur? There are plenty of active monitoring solutions, but they require human ...
10
votes
5answers
1k views

How do *you* track and document routine maintenance?

What software or system do you guys out on server fault use to remind you to do routine maintenance? How do you checklist and log the various items you are supposed to check? Do you have an internal ...
10
votes
2answers
516 views

What's difference between monitoring, tracing and profiling?

I have seen these three words showing up a lot, but don't understand the exact differences between them. For example, collecting CPU utilisation is often called profiling and can also fall into ...