James J

Sysadmin/Engineer/Developer

Linux

» linux

Articles by category: linux


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2018
22 May 2018

Chef-Solo: Basic cookbook intro using NTP from scratch

  Install the Chef Development Kit I am using CentOS 7. Grab the package appropriate for you from here [root@testbox...

11 May 2018

Folding@Home: Linux FAHClient Command Line Installation/Usage

  Overview   A friend of my wife recently lost her husband to a rare form of Cancer. From diagnosis...

11 Apr 2018

Docker: Making a single binary micro-container

  What do we want to containerize   This can be done with whatever binary you choose. You will just...

22 Mar 2018

Secure password sharing via self destruction.

Overview   Often we find ourselves in a situation where we have to share a password. But how do you...

2017
12 Dec 2017

CentOS 6: Upgrade GCC to 5.3.1

  CentOS 6: Upgrade GCC to 5.3.1   Install CentOS SCL repo. yum -y install centos-release-scl   Install the actual...

01 Nov 2017

/dev/[u]random: entropy explained

  Entropy When the topic of /dev/random and /dev/urandom come up, you always hear this word: “Entropy”. Everyone seems to...

21 Sep 2017

sysstat: keep more than 30 days worth of sar data

  Being a good sysadmin, you should comb through your logs periodically… Even better, get a log analyzer. With that...

01 Sep 2017

strace: how do I even use this?

  Strace is one of those tools that can be quite intimidating. But if you dont know how to use...

30 Jul 2017

sysstat: run sar more than one time per minute

  While working on some issues with performance, we needed a bit more granularity than the 10 minute default that...

04 Jul 2017

VMware ESX 6.5: The provided manifest file is invalid: Invalid OVF manfiest entry

Set the stage: Recently while deploying an OVA that I had deployed many times before, I came across this error....

04 Jul 2017

RPM SPEC: Directives of interest

This is not intended to be an extensive guide to building rpms. Although, if there is interest, that can be...

2013
19 May 2013

LVM: Slaving an old drive with existing data

I have an old drive with existing LVM data. The drive is plugged in as /dev/sdb. [root@bt ~]# fdisk -l...

12 Feb 2013

Named: Disable zone transfer(AXFR)

  Recently I have been watching my log files a lot more closely. While doing so, I noticed A LOT...

07 Jan 2013

LFTP: File Transfer Swiss Army Knife

Working in the industry, at one time or another, you will have to transfer files. Im sure it will be...

2012
10 Mar 2012

RPM: Rebuild corrupt rpmdb

So this used to happen a lot… but since yum, not so much… Like an impatient admin, I got tired...