Setting up ELK

elasticsearch (elastic licence, with builtin JAVA)

shasum -a 512 -c elasticsearch-7.9.0-amd64.deb.sha512

kibana (elastic licence)

shasum -a 512 -c kibana-7.9.0-amd64.deb

logstash (elastic licence, require Java 8)

shasum -a 512 -c logstash-7.9.0.deb.sha512

elasticsearch (apache2 licence, no Java)

remember to set JAVA_HOME

shasum -a 512 -c elasticsearch-oss-7.9.0-no-jdk-amd64.deb.sha512

kibana (apache2 licence, no Java)

shasum -a 512 -c kibana-oss-7.9.0-amd64.deb.sha512

logstash (apache2 licence, no Java)

shasum -a 514 -c logstash-oss-7.9.0.deb.sha512

installing elasticsearch

dpkg -i elasticsearch-7.9.0-amd64.deb
sudo systemctl status elasticsearch.service
sudo systemctl start elasticsearch.service

installing kibana

dpkg -i kibana-7.9.0-amd64.deb
sudo systemctl status kibana.service
sudo systemctl start kibana.service

installing logstash

dpkg -i logstash-7.9.0.deb
echo ‘LS_OPTS=”-w 2″‘ >> /etc/defaults/logstash
sudo systemctl status logstash.service
sudo systemctl start logstash.service

Will human transplants change biometrics?

9 December 2019

A transplant patient developed the DNA of his donor, it has emerged.

Chris Long, from Reno in Nevada, had a blood test three months after receiving a bone marrow transplant.

Results revealed his DNA had been “replaced” by that of his donor, a German man 10 years his junior.

Four years later, the donor’s genetic material was found in Mr Long’s cheeks, lips and semen. While levels fluctuated over time, only his chest and head hair were unaffected.

HTTPS and Geolocation with web browsers

I’ve starting coding apps to get a javascript geolocation refresher. Switching between OSX and W10 was quite a pain because:

  1. Safari does not support geolocation over HTTP (no idea why http://localhost/ is considered an issue with Safari).
  2. W10 Edge supports geolocation over HTTP.

After some experimenting, I discovered Chrome and Brave both support geolocation over HTTP on OSX. Chrome definitely was doing WiFi triangulation because it could return my exact lat/lng whereas Brave was returning the midtown lat/lng coordinates.

Problems starting Eclipse after updating JDK on OSX

I came across this problem when updating jdk via brew. Somehow brew removed openjdk-12 and replaced it with 14. Pesky.

After some checks, I figured the Eclipse 2020-06 executable was relying on a hardcoded openjdk path.

To rectify this, I’ve done the following:

  1. Determine the jvm available on osx by dropping to command line and running ‘/usr/libexec/jvm_home -V’

Below is a screen capture of the available openjdks on my OSX. (openjdk-12 was removed somehow). Remember the location of the openjdk directory you wish to use.

2. Edit the openjdk path in eclipse.ini. The path to eclipse.ini is as follows:

Note: I have mine in $HOME/eclipse/java-2020-06. Yours could be in the Applications directory (ie /Applications/Eclipse)

Run ‘nano eclipse’

3. To get this:

eclipse.ini pointing to missing openjdk-12 folder

4. Amend the folder name to the openjdk directory that you’ve determined in Step 1.

I’ve selected openjdk-14.0.2.jdk

5. Ready to start Eclipse by running the eclipse executable.

“The Blockchain hype has slowed : where has it gone and why?” –

Hath the blockchain euphoria finally died a quiet death?

I’ve been saying this to 1. customers, 2. tech friends, 3. lesser tech friends, 4. non-tech friends. Not one believed me apart from the Vandy tech gang (where the real tech people are).

Hope the SG govt didn’t throw in good tax payers $ into this slow database.


Extremely happy to hear the PINEBOOK is now available in a Pro version. The form factor looks identical to a ThinkPad Carbon (afaics)

There will be support for Linux, *BSD and Android 9. The preorder starts on 25th July 2019 but only for those who had registered in the Pinebook forum prior to 1st July 2019.

I say PINEBOOK had stolen the thunder from Apple on innovation for developers!