teyc/b2b

Back to base Linux workshop

Linux for .NET developers

1. Install Windows GIT

2. Start the bash shell

3. Get a login and password for the system using

   curl -X POST https://SERVERNAME/adduser
   

4. Follow the instructions to generate your own key pair and configure your logon to using keys rather than password

5. Once logged in clone this repository

   git clone [email protected]:teyc/b2b.git  
   

6. Then go to the exercise directory

   cd b2b/exercise
   

7. First commands

   cal
   

   echo Microsoft loves linux cat hello.txt more /usr/share/doc/adduser/examples/README man more pwd ls ~ ls -l /bin/net*

8. Identify the Read Write Executable bits when you list files in a directory. Observe that greet.sh is executable. Try running it.

   ./greet.sh
   

9. You can modify the executable bit by using chmod

   chmod uga-x greet.sh
   

10. Run tasks in the foreground

    sleep 5; echo I have snoozed enough!

11. Run tasks in the background

    bash -c "sleep 5; echo I have snoozed enough!" & cal cal

12. Use history to get your past commands, and use bang number e.g. !5 to run command number 5.

13. Use bang and first few letters e.g. !ps works as well

14. Use arrow up and down, and CTRL+A and CTRL+E to move to start and end of line

15. Try

    ifconfig find .. -iname '*.md' which docker

16. Write a telnet service!

    echo "Microsoft <3 Linux" > hello.txt

    nc -l 58016 < hello.txt &

    telnet localhost 58016

17. Daemonize it

    echo '#!/bin/bash nc -l 58016 < hello.txt ' > greet.sh

    chmod a+x greet.sh

    daemon -r -D pwd ./greet.sh

    you can connect to your network service

    using a telnet or nc

    nc localhost 58016

18. You can turn this into a HTTP service

    echo 'HTTP/1.0 200 OK
    Content-Type: text/plain
    
    Microsoft Loves Linux' > hello.html
    

    Then check it out using curl

    curl http://localhost:58016/
    

19. Clear the screen using CTRL+L

Task Manager

1. top

2. htop

3. dstat

4. strace ls strace python

5. netstat -ae

6. opensnoop

   What's opening and closing the .txt files?

   opensnoop '.txt$'

Palette cleanser

1. Enough Linux?

    sudo docker run -it microsoft/dotnet
    cd ~
    dotnet new
    dotnet restore
    dotnet build
    dotnet run
    ls -l
   

2. To log out from docker, use CTRL+D

3. To log out from your session, use CTRL+D

4. Note, this machine has 2GB memory, docker is virtualization without the overhead

For administrators Configuration

Set up the machine by running

sudo ./reset-the-world.sh

This should automatically run up the web service. If you need to do this manually, refer to

ssh -i ~/.ssh/id_rsa chui@SERVER
cd b2b
sudo python app.py 443