Docker exited with code 139 (Solved)

Before this, I have used a Window container for docker and never face issues with code 139.

Then I changed to WSL (Windows Subsystem for Linux) container for the purpose to improve the performance.

But by using WSL I can't start a certain image, the container keeps restarting. This restarting state makes it is impossible to see the container logs by using the command $ docker logs -f <container>.

Hence instead of using $ docker-compose up -d I use $ docker-compose up so I can see the logs during the start.

sample

So somewhere I read this 139 related to system unable to access so location due to permission issues. Then to solve this issue at WSL by updating the .wslconfig by adding

kernelCommandLine = vsyscall=emulate

   Step 1 : Create a file named .wslconfig in your user directory
   Ex:- C://users/[your user name]/.wslconfig
   Step 2 : Add following line to the .wslconfig file

kernelCommandLine = vsyscall=emulate

How to use Google-OR-Tools with Python ( Beginner Tutorial)

Install Python

Download python here https://www.python.org/downloads/

After downloading find the application to install

Click on the application and install. Please tick the checkbox of "Add Python 3.10 to PATH".

Next open cmd or PowerShell then run $ python --version to make sure it has already been installed

Install Google-OR-Tools

Install the Google-OR-Tools as shown at their website at https://developers.google.com/optimization/install.

By using the Powershell run command $ python -m pip install --upgrade --user ortools

Google-OR-Tools installation complete

Running Python program

Then after installing the OR-Tools we can start the code. Furthermore, Google has given a sample script at https://developers.google.com/optimization/introduction/python that we can try.

Use any IDE that you like, for example, I use Sublime. Create a new file paste the script and save it as "program.py"

Next, find the file directory and open the File Explorer. Then by using the Shift + Right Click on Mouse inside the folder.

You will be able to open the PowerShell at the folder directory/location. Choose the "Open PowerShell window here" option.

Finally, run the script by using $ python program.py on the PowerShell.

List of Free Graphics Site ( 33 sites)

If you are beginner game developer and want to try create a game . We recommend you to use this sprite as prototype of your game.

2D Graphics (Free)

Bigchaindb

Failed to connect with another node due to genesis using old cached

$ tendermint unsafe_reset_priv_validator

[Windows] Tutorial of JMeter to Web Load Testing (Localhost)

Download JMeter here --> https://jmeter.apache.org/download_jmeter.cgi

Extract the zip and find the application

Choose File then click on Template

Choose Building Web Test Plan and click on "Create"

To increase users thread goto Scenario 1 and change the Number of Thread

Lastly, click on the Start button

View the result

Load Balancing Between Virtual Box

After a few try and error, I figure out the best tutorial to make Nginx load balancing works.

$ sudo gedit /etc/nginx/conf.d/loadbalancer.conf

upstream backend {
        server 192.168.56.110;
        server 192.168.56.120;

        server 192.168.56.130;

        server 192.168.56.120;

    }
	
    server {
        listen      80 default_server;
        listen      [::]:80 default_server;

        location / {
	        proxy_set_header    X-Real-IP $remote_addr;
	        proxy_redirect      off;
	        proxy_set_header    X-Forwarded-For $proxy_add_x_forwarded_for;
	        proxy_set_header    Host $http_host;
		proxy_pass http://backend;
	}
}

$ sudo nginx -t

$ sudo systemctl restart nginx
$ sudo systemctl enable nginx

Ref: https://www.tecmint.com/use-nginx-as-http-load-balancer-in-linux/amp/

Image Credit : https://www.serverlab.ca/tutorials/windows/web-servers/load-balancing-web-servers-with-windows-server-2012-r2/

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