The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Power User’ Category

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Redirect Detective – A Free Tool To Trace Where Redirects End Up

Posted by jpluimers on 2020/02/27

Cool tool, but be aware it does aJavaScript:xmlhttpPost from , so your data can be logged [WayBack] Redirect Detective – A Free Tool To Trace Where Redirects End Up.

For http://www.xs4all.nl/~jp, it shows these redirects (where in bold I’ve listed the changes):

Oh and it runs this call: JavaScript:xmlhttpPost("/linkdetect.px")?word=www.xs4all.nl%2F%7Ejp from [WayBack] redirectdetective.com/ajax.js.

Note that this shows more redirects than the plain http ones, so wget from [WayBack] wget – How do I display all URLs in a redirect chain? – Unix & Linux Stack Exchange shows this:

$ wget http://www.xs4all.nl/~jp 2>&1 | grep Location:
Location: https://www.xs4all.nl/~jp [following]
Location: https://jp.home.xs4all.nl/ [following]

–jeroen

Posted in *nix, *nix-tools, Communications Development, Development, HTTP, Internet protocol suite, Power User, TCP, wget | Leave a Comment »

When you have physical access to a machine, assume it is compromised

Posted by jpluimers on 2020/02/24

When you have physical access to a machine, assume it is compromised.

Sometimes the compromise can be as simple as a HID device access:

–jeroen

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Posted in Power User, Security | Leave a Comment »

Tomato by shibby – upgrade procedure and cfg backup | LinksysInfo.org

Posted by jpluimers on 2020/02/24

Reminder to self: [WayBack] Tomato by shibby – upgrade procedure and cfg backup | LinksysInfo.org:

I keep a text file with the changes I’ve made after a fresh install and I keep the file updated as I make changes.

Re-configuring the router after that takes a bit of time, but it is not that bad. Toastman’s method (here) noted above as well as the methods described here and here can also be used, but I haven’t tried them.

which references:

–jeroen

Posted in Internet, Power User, routers, TomatoUSB | Leave a Comment »

ESXi: Failed to reconfigure virtual machine… There are insufficient licenses to complete this operation.

Posted by jpluimers on 2020/02/21

Failed to reconfigure virtual machine W81Entx64-vs2017. There are insufficient licenses to complete this operation.

Searching for “There are insufficient licenses to complete this operation.” memory did not reveal much, so at first I thought I had a memory issue.

A quick look at esxtop in memory (m) mode indicated that was totally fine:

BTW: esxtop is a fantascit tool, with truckloads of information, so you should definitely read these:

Then something occurred to me:

The cause was that I tried to update the memory of an ESXi Windows VM which I thought I had shut-down from within Windows, but actually bumped an error message during the shutdown.

Shutting down properly (shutdown -s -t 0 in Windows), then increasing the memory worked fine:

Virtual machine W81Ent64-vs2017 was successfully reconfigured.

ESXi cannot increase the memory of a live system, hence the license error as per [WayBack] VMware Hot-Add: How and When to Use it:

One of the most common questions I receive on the daily management of virtual machines is if you should turn on hot-add features and why doesn’t VMware turn them on by default. The answer is very clear.

What are the requirements for Hot-add/Hot-plug:

  • Your virtual machines need to run at minimum hardware version 7.
  • Hot-add/Hot-Plug is not compatible with Fault Tolerance
  • vSphere Advanced, Enterprise or Enterprise plus.
  • Only hot-add is possible. You cannot “hot-remove” RAM or vCPUs.
  • Hot-Add/Hot-plug must be supported by the VM operating system!
  • Guest-OS licensing limitations need to be monitored and taken into consideration. You are changing the number of vCPUs/RAM!

–jeroen

Posted in ESXi6.5, Power User, Virtualization, VMware, VMware ESXi | Leave a Comment »

Swap and Memory Pressure: How Developers think to how Operations people think – The Isoblog.

Posted by jpluimers on 2020/02/21

Still a very insightful read: [WayBack] Swap and Memory Pressure: How Developers think to how Operations people think – The Isoblog.

I totally agree with the view Kristian Köhntopp presents which I usually call “fail early, fail hard, fail clearly”.

–jeroen

via: [WayBack] Swap and Memory Pressure: How Developers think vs. how Operations people think. – Kristian Köhntopp – Google+

Posted in DevOps, Power User | Leave a Comment »

5 Minutes Early Is On Time; On Time Is Late; Late Is Unacceptable

Posted by jpluimers on 2020/02/21

I agree with this, but used to be very bad at it: [WayBack] 5 Minutes Early Is On Time; On Time Is Late; Late Is Unacceptable

Being late is unacceptable. While that sounds harsh, it’s the truth and something that should be said more often. I don’t care whether you’re attending a dinner party, a conference call, or a coffee meeting — your punctuality says a lot about you.

A few things that helped me:

  • only attend things that are really important
  • reserve way enough time for travel and preparation

It’s still not perfect, but they help me things I had a hard time coping with:

  • planning way too much in a day (hence the only really important stuff)
  • making far to optimistic estimates for travel and preparation (now I do my estimate times 2 or better: 3)

Via: [WayBack] 5 Minutes Early Is On Time; On Time Is Late; Late Is Unacceptable – Marjan Venema – Google+

–jeroen

Posted in LifeHacker, Power User | Leave a Comment »

Writing a Time Series Database from Scratch | Fabian Reinartz

Posted by jpluimers on 2020/02/20

Long read but very much worth it: [WayBack] Writing a Time Series Database from Scratch | Fabian Reinartz.

On using the file systems strengths for a flexible time series database that is both fast to write, and read millions of data points per second.

via:

Similarly interesting: [WayBack] Translations: This article was translated to Simplified Chinese by Xiong Duo and to Korean by Matt Lee (이 성욱). Introduction I want to make solid-state

–jeroen

Posted in Development, Power User, Software Development, Systems Architecture | Leave a Comment »

Does anyone knows a existing implementation of bcrypt or scrypt for delphi?

Posted by jpluimers on 2020/02/19

For my link archive: [WayBack] Does anyone knows a existing implementation of bcrypt or scrypt for delphi? – Fabian S. Biehn – Google+:

–jeroen

Posted in Delphi, Development, Encryption, Power User, Security, Software Development | Leave a Comment »

linux – Bash: Command grouping (&&, ||, …) – Stack Overflow

Posted by jpluimers on 2020/02/18

Excellent answer at [WayBack] linux – Bash: Command grouping (&&, ||, …) – Stack Overflow by Charles Duffy:

Operator precedence for && and || is strictly left-to-right.

Thus:

pwd; (ls) || { cd .. && ls student/; }  && cd student || cd / && cd ;

…is equivalent to…

pwd; { { { (ls) || { cd .. && ls student/; }; } && cd student; } || cd /; } && cd ; }

…breaking that down graphically:

pwd; {                                      # 1
       {                                    # 2
         { (ls) ||                          # 3
                   { cd .. &&               # 4
                              ls student/;  # 5
                   };                       # 6
         } && cd student;                   # 7
       } || cd /;                           # 8
     } && cd ;                              # 9
  1. pwd happens unconditionally
  2. (Grouping only)
  3. ls happens (in a subshell) unconditionally.
  4. cd .. happens if (3) failed.
  5. ls student/ happens if (3) failed and (4) succeeded
  6. (Grouping only)
  7. cd student happens if either (3) succeeded or both (4) and (5) succeeded.
  8. cd / happens if either [both (3) and one of (4) or (5) failed], or [(7) failed].
  9. cd happens if (7) occurred and succeeded, or (7) occurred and succeeded.

Using explicit grouping operators is wise to avoid confusing yourself. Avoiding writing code as hard to read as this is even wiser.

–jeroen

Posted in *nix, *nix-tools, bash, bash, Development, Power User, Scripting, Software Development | Leave a Comment »

100 km – how much needs to go into a tank? well2wheels/well to wheels (kWh).png at master · htc1977/well2wheels · GitHub

Posted by jpluimers on 2020/02/17

Since physics does not tend to change, this is still very accurate: [WayBack] well2wheels/well to wheels (kWh).png at master · htc1977/well2wheels · GitHub graphical WELL-TO-WHEELS Report Version 4.1 European Commission, 2014 – htc1977/well2wheels

A big picture is below the fold.

Other graphical file formats at [WayBack] GitHub – htc1977/well2wheels: graphical WELL-TO-WHEELS Report Version 4.1 European Commission, 2014

via:

–jeroen

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Posted in LifeHacker, Power User, science | Leave a Comment »

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