centum

## Documentation.md

      
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                centum
                / Documentation.md
            
            
              Created
              December 11, 2022 18:44
                — forked from KartikTalwar/Documentation.md
            
              
                Rsync over SSH - (40MB/s over 1GB NICs)
              
          
    The fastest remote directory rsync over ssh archival I can muster (40MB/s over 1gb NICs)

This creates an archive that does the following:

rsync
(Everyone seems to like -z, but it is much slower for me)

a: archive mode - rescursive, preserves owner, preserves permissions, preserves modification times, preserves group, copies symlinks as symlinks, preserves device files.
H: preserves hard-links
A: preserves ACLs


## custom_keys_git_ssh
#!/bin/bash
# Script to use custom ssh keys for various git repositories
# Run without arguments to get usage info.
#
# How it works:
# When used with SSH, git sends the path to the repository in the SSH command.
#   @see: https://github.com/git/git/blob/e870325/connect.c#L1268
# We extract this info and search for a key with the name.
# Based on the source, this seems to be used format since v2.0 at least.
#   @see: https://github.com/git/git/commit/a2036d7

## how_to_reset_kafka_consumer_group_offset.md

      
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                centum
                / how_to_reset_kafka_consumer_group_offset.md
            
            
              Created
              May 21, 2020 13:02
                — forked from marwei/how_to_reset_kafka_consumer_group_offset.md
            
              
                How to Reset Kafka Consumer Group Offset
              
          
    Kafka 0.11.0.0 (Confluent 3.3.0) added support to manipulate offsets for a consumer group via cli kafka-consumer-groups command.

List the topics to which the group is subscribed

kafka-consumer-groups --bootstrap-server <kafkahost:port> --group <group_id> --describe
Note the values under "CURRENT-OFFSET" and "LOG-END-OFFSET". "CURRENT-OFFSET" is the offset where this consumer group is currently at in each of the partitions.

Reset the consumer offset for a topic (preview)


## tokens.md

      
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                centum
                / tokens.md
            
            
              Created
              December 4, 2019 08:52
                — forked from zmts/tokens.md
            
              
                Про токены, JSON Web Tokens (JWT), аутентификацию и авторизацию. Token-Based Authentication
              
          
    Про токены, JSON Web Tokens (JWT), аутентификацию и авторизацию. Token-Based Authentication

Last major update: 21.10.2019
Основы:

Аутентификация(authentication, от греч. αὐθεντικός [authentikos] – реальный, подлинный; от αὐθέντης [authentes] – автор) - это процесс проверки учётных данных пользователя (логин/пароль). Проверка подлинности пользователя путём сравнения введённого им логина/пароля с данными сохранёнными в базе данных.
Авторизация(authorization — разрешение, уполномочивание) - это проверка прав пользователя на доступ к определенным ресурсам.
Например после аутентификации юзер sasha получает право обращатся и получать от ресурса "super.com/vip" некие данные. Во время обращения юзера sasha к ресурсу vip система авторизации проверит имеет ли право юзер обращатся к этому ресурсу (проще говоря переходить по неким разрешенным ссылкам)

  
## yaml_ordered_dict.py
import yaml
import yaml.constructor

try:
    # included in standard lib from Python 2.7
    from collections import OrderedDict
except ImportError:
    # try importing the backported drop-in replacement
    # it's available on PyPI
    from ordereddict import OrderedDict

## mysql-convert-utf8.py
#! /usr/bin/env python
import MySQLdb

host = "localhost"
passwd = ""
user = "root"
dbname = "mydbname"

db = MySQLdb.connect(host=host, user=user, passwd=passwd, db=dbname)
cursor = db.cursor()
	#!/bin/bash
	# Script to use custom ssh keys for various git repositories
	# Run without arguments to get usage info.
	#
	# How it works:
	# When used with SSH, git sends the path to the repository in the SSH command.
	# @see: https://github.com/git/git/blob/e870325/connect.c#L1268
	# We extract this info and search for a key with the name.
	# Based on the source, this seems to be used format since v2.0 at least.
	# @see: https://github.com/git/git/commit/a2036d7
	import yaml
	import yaml.constructor

	try:
	# included in standard lib from Python 2.7
	from collections import OrderedDict
	except ImportError:
	# try importing the backported drop-in replacement
	# it's available on PyPI
	from ordereddict import OrderedDict
	#! /usr/bin/env python
	import MySQLdb

	host = "localhost"
	passwd = ""
	user = "root"
	dbname = "mydbname"

	db = MySQLdb.connect(host=host, user=user, passwd=passwd, db=dbname)
	cursor = db.cursor()