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

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215
votes
2answers
78k 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 ...
187
votes
73answers
191k views

What tool do you use to monitor your servers?

For a more comprehensive list of monitoring tools and their features, check out this Wikipedia page. As the question states, what are the most commonly used tools used for this task and what are ...
42
votes
14answers
41k 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? ...
42
votes
19answers
8k views

Can anyone recommend a website monitoring service? [closed]

What are people using for website monitoring services? I am referring to a service that I can configure specific hits to my site to monitor if the site is up, and how fast it is responding to the ...
40
votes
34answers
7k views

Best smartphone for sysadmins?

I need a cell phone that will help me keep an eye on my servers and services when I am away from my computer/desk/workplace. Which smart phone would you recommend for sysadmins? An SSH client is a ...
31
votes
24answers
8k 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
34k 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 ...
27
votes
1answer
7k 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?
26
votes
2answers
14k 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 ...
25
votes
5answers
20k 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 ...
25
votes
6answers
12k 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 ...
25
votes
5answers
25k 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?
25
votes
3answers
4k 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 ...
24
votes
3answers
14k views

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

Monit runs with root, but i don't want to start my processes as root.. like mysql, mongrel, apache..
22
votes
8answers
18k 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. ...
20
votes
9answers
2k 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 ...
20
votes
4answers
14k 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 ...
20
votes
5answers
2k 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 a ...
20
votes
2answers
3k 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 ...
19
votes
3answers
43k views

ipmitool - can't find /dev/ipmi0 or /dev/ipmidev/0

Based on a previous question, I installed ipmitool (yum install ipmitool). Even after a reboot, though, i get the following error when trying to run ipmitool power status: Could not open device at /...
19
votes
7answers
19k 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 ...
18
votes
7answers
39k 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?
18
votes
11answers
23k views

How to monitor and log the memory/cpu usage of processes over time? [closed]

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 ...
18
votes
10answers
3k views

Network Traffic Monitoring

What is the best tool to monitor/analyze network traffic on an entire network (several subnets)? I'm looking for something that will help me toubleshoot bandwidth problems when, for instance, users ...
18
votes
4answers
2k views

Monitoring production server [closed]

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 ...
17
votes
7answers
6k views

Continuously 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 ...
17
votes
6answers
14k 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 ...
16
votes
6answers
14k views

Process Monitor fails to start on a 64 bit computer

When I try to start Process Monitor from SysInternals on some 64 bit windows 7 machines,the process fails to start. There is no error message. I double click and nothing happens. Other 64 bit windows ...
16
votes
5answers
15k views

View content of memcached

Are there any tools to explore what is currently cached inside a memcached pool? Not some much graphs, but the actual key/values currently stored.
16
votes
8answers
8k 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 ...
15
votes
5answers
679 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
10answers
17k 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 ...
15
votes
9answers
9k 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 ...
15
votes
2answers
4k 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 ...
15
votes
2answers
730 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 ...
15
votes
1answer
5k 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 ...
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 bandwidth....
14
votes
8answers
78k views

Testing a website from Linux command line

I am looking for a tool to test a website from a Linux command line. From the output, I need to know the http response (status codes) but also benchmark the time it takes to download the different ...
14
votes
5answers
49k views

How can I manually run a nagios check from the command line?

When defining and testing new services in nagios I have been restarting nagios, then clicking the service, and rescheduling a check for as soon as possible, then waiting until the check happens. Is ...
14
votes
6answers
1k 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. ...
14
votes
5answers
4k 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
7answers
6k 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% ...
14
votes
16answers
11k 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
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 detect ...
14
votes
4answers
4k 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 ...
14
votes
4answers
3k 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 ...
13
votes
1answer
11k views

Monit versus Nagios

Does nagios offer any additional functionality when compared to monit? This answer states that monit is a clumsy tool for situational awareness, which is the reason I'm asking the question.
13
votes
5answers
17k 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 ...
13
votes
3answers
6k views

Disk Capacity Planning for Whisper / Graphite

Does anyone have any formulas, or maybe some sample data from their environment that can help me estimate how much disk space will be used by graphite per datapoint?
12
votes
17answers
4k views

MySQL monitoring tools

What tools do you use to monitor the health of your MySQL server instance? Are they for free or commercial?