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

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199
votes
2answers
71k 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 ...
42
votes
14answers
39k 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? ...
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 ...
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 ...
26
votes
1answer
6k 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?
25
votes
5answers
19k 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
11k 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
24k 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
13k 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..
21
votes
8answers
17k 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
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
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 ...
19
votes
4answers
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 ...
19
votes
7answers
18k 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
37k 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
3answers
39k 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 ...
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
8answers
5k 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 ...
17
votes
11answers
22k 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 ...
16
votes
5answers
13k 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
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
665 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
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 ...
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
1answer
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
725 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 ...
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
45k 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
10answers
16k 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 ...
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
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 ...
13
votes
8answers
71k 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 ...
13
votes
5answers
14k 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.
13
votes
5answers
16k 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
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 ...
12
votes
1answer
10k 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.
12
votes
3answers
5k 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
2answers
1k 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
2k 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
9answers
3k 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 ...
11
votes
8answers
37k views

Get a history of CPU/memory usage

Is there someway to record Task Managers info about CPU and memory usage to examine later? Or an equivalent tool?
11
votes
2answers
16k 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 ...
11
votes
2answers
2k 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 ...
11
votes
3answers
4k views

Alternative to etsy/statsd

Is there any alternative to etsy's statsd? Maybe even a complete dashboard-like solution? My research only found proprietary SaaS solutions. For those who do not know: statsd is a deamon which ...