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strace Wow Much Syscall

strace is the system call tracer for Linux. It currently uses the arcane ptrace() (process trace) debugging interface, which operates in a violent manner: pausing the target process for each...

Understanding the CPU Usage in Apache server status

I was spending time on graphing the Apache Server status values in graphite ( Cpu load and busy worker etc ) . While doing all this performance testing I was...

HAProxy and Apache performance tuning tips

Got a wonderful article by Grig about HAProxy and Apache tuning. http://agiletesting.blogspot.in/2009/03/haproxy-and-apache-performance-tuning.html  

How to enable Haproxy Logs in Centos

For performance  reasons HAProxy doesn't log directly to files. So we need to handle  that with syslog server. But Haproxy also requires a syslog to listen on UDP port (...

CheckMK memory plugin - Linux free command explained

CheckMK is graphing the numbers on the "-/+ bufferes/cache" line.  This is a common misconception of the Linux "free" command.   Linux manages memory by using any unused RAM for...

MongoDB vs CouchDB

MongoDB vs CouchDB. Fantastic explanation by DanG

etsy/logster

etsy/logster.   Logster is a utility for reading log files and generating metrics to configurable outputs. Graphite, Ganglia, Amazon CloudWatch, Nagios, StatsD and stdout are currently supported. It is ideal...

Graphite dashboards

Some wonderful Graphite dashboards http://grafana.org/ https://github.com/urbanairship/tessera https://github.com/ripienaar/gdash https://github.com/Dieterbe/graph-explorer https://github.com/obfuscurity/descartes https://github.com/obfuscurity/tasseo http://kenhub.github.com/giraffe http://jondot.github.com/graphene/ http://square.github.com/cubism/ via Installing and Configuring Graphite on CentOS | 4Aiur4Aiur.

Found ‘${BUILDROOT}’ in installed files; aborting | Adam Young’s Web Log

his is the set of files that get packaged up for the final RPM.  The files here then get checked to see if they have this path embedded in them. ...

Openstack Archiecure

[slideshare id=43160012&doc=architecture-150102195159-conversion-gate01]

How to Enable the Uptime alerts in Check_Mk

How to Enable  the Uptime alerts in Check_Mk   OMD[watchdog]:~/etc/check_mk/conf.d$ cat uptime.mk check_parameters += [ ( {"min": (600, 600)}, ALL_HOSTS, ["Uptime"] ), ]  

www.TipsNtrapS.com: Technodrone: Nova-Docker on Juno

After enabling the docker as a hyper wiser support on my test one node open-stack implementation.   I added another host in my nova compute farm, done slimier steps as...

My RDO installation procedure | my Knowledge Base

as your real public network, let’s remove these settings and start fresh: via My RDO installation procedure | my Knowledge Base.

Ansible Handlers

http://wherenow.org/ansible-handlers/

Closing the stdin in Bash script

For one of my requirement my script is behaving oddly and the reason come out was its stdin was open ( will right in detail later)   to fix the...