admin

Jun 082017
 

Howdy!

I won’t be going into a whole lot of detail about sar as this has been documented elsewhere multiple times but basically, SAR stands for System Activity Report and as its name suggests, the sar command is used to collect,report & save CPU, Memory, I/O usage in Unix like operating systems. The SAR command produces reports on the fly and can also save the reports in the log files as well. The sar man page states:

The sar command writes to standard output the contents of selected cumulative activity counters in the operating system. The accounting system, based on the values in the count and interval parameters, writes information the specified number of times spaced at the specified intervals in seconds. If the interval parameter is set to zero, the sar command displays the average statistics for the time since the system was started. If the interval parameter is specified without the count parameter, then reports
are generated continuously.

Continue reading »

 Posted by at 9:57 am
Jun 062017
 

As a request comes in, it is denoted in the scoreboard. The scoreboard itself is basically a way to keep track of each incoming, waiting, and completing connections. These connections are broken down into the following types:

  1. “_” Waiting for Connection
  2. “S” Starting up
  3. “R” Reading Request
  4. “W” Sending Reply
  5. “K” Keepalive (read)
  6. “D” DNS Lookup
  7. “C” Closing connection
  8. “L” Logging
  9. “G” Gracefully finishing
  10. “I” Idle cleanup of worker
  11. “.” Open slot with no current process

Here is an example of the apache scoreboard in WHM:
Continue reading »

 Posted by at 4:24 pm
May 282016
 

Hey all,

We all know the feeling of dread (eg. pucker) when a linecard goes down because someone uploaded and then rebooted into a corrupt IOS on a core router and the phones start ringing off the hook… le sigh…

Here. It. Comes.

I AM LOSING THOUSANDS OF DOLLARS A SECOND….!!!

In having to deal with this and a multitude of other issue which caused client’s “concern”, I have found that the following thoughts and ideas can shape your perspective on how to address a client’s concerns in a manner that is beneficial to both you and them and will ultimately address the overriding issue at hand, which is the primary goal. (Is some of it positive psychological manipulation? yup… Knowing and understanding human behavior is the best way to deal with any issues, even in such a temporarily client/vendor relationship as addressing a new issue)
Continue reading »

 Posted by at 11:18 am
May 212016
 

DESCRIPTION
‘findmnt’ will list all mounted filesytems or search for a filesystem. The findmnt command is able to search in /etc/fstab, /etc/mtab or proc/self/mountinfo. If device or mountpoint is not given, all filesystems are shown.
The device may be specified by device name, maj:min, filesystem LABEL or UUID, or partition PARTUUID or PARTLABEL. Note that a device name may be interpreted as a mount?point (and vice versa) if the –target or –source options are not specified. The command prints all mounted filesystems in the tree-like format by default.

Continue reading »

 Posted by at 8:21 am