James J

Sysadmin/Engineer/Developer

Blog

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...

20 Feb 2018

CryptoCurrency: Building ccminer in Ubuntu 17.10

  CryptoCurrency: Building ccminer in Ubuntu 17.10   In a previous post, I complained about how impossible it was to...

10 Feb 2018

VMware: How to install RVC with RVM

  VMware: How to install RVC with RVM   For most of my life, I have preferred the command line...

24 Jan 2018

CryptoCurrency: Building a Rig Part 3

  CryptoCurrency: Building a Rig Part 3   So, this has been quite a learning experience. Don’t mix between your...

04 Jan 2018

CryptoCurrency: Building a Rig Part 2

  CryptoCurrency: Building a Rig Part 2   As expected, dedicated CPU mining didn’t last very long. Verium(VRM) spiked, which...

23 Dec 2017

CryptoCurrency: Building a Rig Part 1

  CryptoCurrency: Building a Rig Part 1   Recently the price of BitCoin has skyrocketed. This led to a lot...

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...

15 Oct 2017

smurf.c: The first DDoS attack tool (20th Anniversary)

  History Smurf.c(by TFreak) hit the spotlight 20 years ago this month(Oct 1997). To give you an idea of the...

01 Oct 2017

Cloud: Fully utilizing LVM in IBM Bluemix (Softlayer cloud)

  Backstory My apologies in advance I will likely use the names Softlayer and IBM Bluemix interchangably… For years I...

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...

08 Sep 2017

VMware: bye, bye c# client

  The common use-case here is that you updated to ESX 6.5 and now you get this error when connecting:...

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...

16 Aug 2017

VMware OVFTool: new default to sha256?

  Dealing with quite a few different versions of VMware, I get quite a bit of indirect support work. Recently,...

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...

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...