kottans-backend

Git and GitHub

• Version Control with Git

  Course is pretty basic, but I did learn a bit about proper usage of tags and reverts of the commits. Mainly because I have always struggled with counting commits back from the HEAD

• try.github.io

  Have already passed it a while ago, though Learngitbranching was quite a tool for me at the time.

• Extras

  • Git за 30 хвилин

  • Git tips — consolidate your knowledge of Git

  • Learn git branching — improve your understanding of branching

  • Fork a repo - freely experiment with changes without affecting the original project; Sync a repo - keep a fork of the repository up-to-date with the upstream repository

  • Communicating using Markdown

  • TypingClub — improve your typing speed

  • Как учиться и справляться с негативными мыслями

Unix Shell

• Linux Survival
  Modules 1-3 were quite easy, since I use Ubuntu at university, but 4th module was helpful and full of new information, that takes too much time to find and read but saves a lot more than that.

• linuxcommand.org
  Learned a lot about writing scripts. Though I do not get across them too often, I think it nice to know at least a necessary minimum.

• Extra Materials
  • Linux Bash Shell Cheat Sheet
  • Advanced Bash-Scripting Guide. An in-depth exploration of the art of shell scripting
  • A Guide to 100 (ish) Useful Unix Commands

Git Collaboration

I found latest section on rebasing, cherry-picks and other useful as never really used those commands, mainly because did not need to summary

• Extra materials
• An Introduction to Git and GitHub by Brian Yu (CS50 course), video, ~40 min.
• Oh shit, git!
• Flight rules for git
• GitHub Learning Lab

Go basics 1

Theory

1. Passed "Tour of Go", Effective go, Golangbootcamp
2. Reported that EXL skills did not work.
3. Finished articles

Practice

Please note, roman digits task uses numbers.go file, since I did not want to clutter the main.go

roman digits

• Extra materials

• FreeCodeCamp Golang Course

• Go By Example

• An Introduction to Programming in Go;

• 50 оттенков Go

Memory Management

Answers

• What's going to happen if program reaches maximum limit of stack ?

  we have a stack overflow and the program receives a Segmentation Fault.

• What's going to happen if program requests a big (more then 128KB) memory allocation on heap ?

  the heap is enlarged via the brk() system call (implementation) to make room for the requested block

• What's the difference between Text and Data memory segments ? Text - read/execute - has code that was run Data - read/write - has initialized variables

  An extract from the output

7f67a4850000-7f67a4854000 r--p 00027000 08:11 134921                     /usr/lib64/libtinfo.so.6.0                                                                            
7f67a4854000-7f67a4855000 rw-p 0002b000 08:11 134921                     /usr/lib64/libtinfo.so.6.0                                                                            
7f67a4855000-7f67a487c000 r-xp 00000000 08:11 134641                     /usr/lib64/ld-2.25.so                                                                                 
7f67a4a27000-7f67a4a65000 r-xp 00000000 08:11 134826                     /usr/lib64/libnss_systemd.so.2                                                                        
7f67a4a65000-7f67a4a68000 r--p 0003d000 08:11 134826                     /usr/lib64/libnss_systemd.so.2                                                                        
7f67a4a68000-7f67a4a69000 rw-p 00040000 08:11 134826                     /usr/lib64/libnss_systemd.so.2                                                                        
7f67a4a69000-7f67a4a6c000 rw-p 00000000 00:00 0                                                                                                                                
7f67a4a79000-7f67a4a7b000 rw-p 00000000 00:00 0                                                                                                                                
7f67a4a7b000-7f67a4a7c000 r--p 00026000 08:11 134641                     /usr/lib64/ld-2.25.so                                                                                 
7f67a4a7c000-7f67a4a7e000 rw-p 00027000 08:11 134641                     /usr/lib64/ld-2.25.so                                                                                 
7f67a4a7e000-7f67a4b83000 r-xp 00000000 08:11 131601                     /usr/bin/bash                                                                                         
7f67a4d82000-7f67a4d86000 r--p 00104000 08:11 131601                     /usr/bin/bash                                                                                         
7f67a4d86000-7f67a4d8f000 rw-p 00108000 08:11 131601                     /usr/bin/bash
7f67a4054000-7f67a421b000 r-xp 00000000 08:11 134666                     /usr/lib64/libc-2.25.so                                                                                           
7f67a4d8f000-7f67a4d99000 rw-p 00000000 00:00 0                                                                                                                                
7f67a58a6000-7f67a58e8000 rw-p 00000000 00:00 0                          [heap]                                                                                                
7ffe34c43000-7ffe34c64000 rw-p 00000000 00:00 0                          [stack]                                                                                               
7ffe34cbb000-7ffe34cbd000 r-xp 00000000 00:00 0                          [vdso]                                                                                                
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]

Heap 7f67a58a6000-7f67a58e8000                                                                                                 
Stack 7ffe34c43000-7ffe34c64000 
MMS 7f67a4054000-7f67a421b000

Materials were not easy but some background from university helped a lot. Besides, commands did not really work on my mac, but since, hey, Ubuntu is running on it as well, I found my way around these obstacles.

• Extra materials
• Debugging: Simple Memory Leaks in Go
• Avoiding Memory Leak in Golang API
• Как устроен garbage collector в Go 1.9

TCP. UDP. Network

1. Internet 101

   Easy course with just little basics

2. Networking for Web Developers

   Had some interesting info in parts 4 and 5. Liked reading how sending packets and etc work(handshakes, flags, teardowns and so on)

   Also, the way traceroute works - sending suicide packets to get the route seems like a genius idea for the problem

3. How DNS Works

   Nice comic, enjoyed myself and sent to a friend

   

Extra materials

• Introduction to TCP/IP. Course
• What happens when you type google.com into your browser and press enter?
• Big list of TCP/UDP ports
• Package 'net' Golang docs