Простой надежный прерыватель указателя поворотов

Не претендую на оригинальность решения, если где-то кто-то раньше опубликовал подобное - пишите, добавлю ссылку в описании

 

AWS

 aws lambda invoke --function-name=<fn> --region=us-west-1 out.txt

asw s3 ls

awsconsole > my security credentials > Access keys
 aws configure

aws ec2 describe-regions

aws s3 mb s3://asfg

aws s3 sync s3://asdf --delete

aws s3 cp /path/to/file s3://sample_bucket --acl public-read




    final static String ACCESS_KEY = "";
    final static String SECRET_KEY = "";
    final static Regions REGION = Regions.EU_CENTRAL_1;
    

//        final AmazonS3 s3 = AmazonS3ClientBuilder.defaultClient();
        final AmazonS3 s3 = AmazonS3ClientBuilder.standard()
                .withCredentials(new AWSStaticCredentialsProvider(new BasicAWSCredentials(ACCESS_KEY, SECRET_KEY)))
                .withRegion(REGION)
                .build();
        List<Bucket> list = s3.listBuckets();

 

Windows cleanup

win+r disk cleanup

win+r %temp%

Select the Start button, then select Settings > Apps > Startup.

 

Ubuntu autorun

alt+F2 gnome-session-properties

 gnome-startup-applications

AWS

SIMPLE MONTHLY CALCULATOR
https://calculator.s3.amazonaws.com/index.html
   

AWS Free Tier
https://aws.amazon.com/free/?nc2=smc&all-free-tier.sort-by=item.additionalFields.SortRank&all-free-tier.sort-order=asc&awsf.Free%20Tier%20Categories=categories%23databases

aws configure

aws dynamodb describe-table --table-name BaseballStats

 aws dynamodb batch-write-item --request-items file://./teams.json

aws dynamodb scan --return-consumed-capacity "TOTAL" --table-name BaseballStats

 aws ec2 describe-instances --profile prod-user

AWS credentials provider chain that looks for credentials in this order:

• Environment Variables - AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY (RECOMMENDED since they are recognized by all the AWS SDKs and CLI except for .NET), or AWS_ACCESS_KEY and AWS_SECRET_KEY (only recognized by Java SDK)
• Java System Properties - aws.accessKeyId and aws.secretKey
• Web Identity Token credentials from the environment or container
• Credential profiles file at the default location (~/.aws/credentials) shared by all AWS SDKs and the AWS CLI
• Credentials delivered through the Amazon EC2 container service if AWS_CONTAINER_CREDENTIALS_RELATIVE_URI" environment variable is set and security manager has permission to access the variable,
• Instance profile credentials delivered through the Amazon EC2 metadata service

Credential retrieval order

sudo yum remove java-1.6.

sudo yum install java-1.8.0-openjdk-devel

sudo alternatives --config java

sudo yum install apache-maven

mvn -v

export JAVA_HOME=

mvn -v

aws sr mb s3://asdf.com

aws s3 ls s3://asdf.com

./mvnw clean install

maven reload all projects

./mvnw clean verify

RESTfull API

REST API Architectural Constraints:

 A Restful system consists of a:

• client who requests for the resources.
• server who has the resources.

 Architectural Constraints of RESTful API: 

• Uniform Interface
• Stateless
• Cacheable
• Client-Server
• Layered System
• Code on Demand

RESTfull = REST over HTTP

GET	200 OK	404 Not Found
POST	201 Created	404 Not Found 401 Unauthoriized 409 Conflict
PUT PATCH	200 OK	404 Not Found 401 Unauthoriized 405 Method Not Allowed
DELETE	200 OK	404 Not Found 401 Unauthoriized
OPTIONS	200 OK
HEAD	200 OK	404 Not Found

Response code:
1xx Information
2xx Success
3xx Redirect
4xx Client error
   400 - Bad request
   401 - Unauthorized
   403 - Forbidden
   404 - Not found
   405 - Method not allowed
5xx Server error

https://restcountries.com/#endpoints-all

MySQL

 connect phpMyAdmin to localhost:3307

https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-ubuntu-18-04#step-2-%E2%80%94-installing-mysql

vim /etc/phpmyadmin/config-db.php

/etc/init.d/apache2 restart
 

ALTER USER 'asdf'@'%' IDENTIFIED WITH mysql_native_password
BY '123';
FLUSH PRIVILEGES;

SELECT user,authentication_string,plugin,host FROM mysql.user;

MS SQL

https://docs.microsoft.com/en-us/sql/relational-databases/databases/view-a-list-of-databases-on-an-instance-of-sql-server?view=sql-server-ver15 

SELECT name, database_id, create_date FROM sys.databases ; GO 

SELECT name FROM sys.databases ;

USE AdventureWorks2012;

SELECT DATEADD(month, 1, '20060830');

UPDATE column SET am=DATEADD(month, 1, column)   

AMD compatibility

 https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/PRIME_A320M-E/Memory_QVL_for_AMD_Ryzen_2nd_Generation_Processors.pdf

 https://www.amd.com/en/products/apu/7th-gen-a6-9500e-apu

https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/Z170-K/E11133_MB_Pin_Definition_v2_web_only.pdf 

https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/PRIME_A320M-E/PRIME_A320M-E_Devices_report.pdf?_ga=2.150868278.121035418.1589210573-1092435267.1587983989

SSL

 

 https://www.baeldung.com/spring-boot-https-self-signed-certificate

 keytool -genkeypair -alias baeldung -keyalg RSA -keysize 2048 -storetype PKCS12 -keystore baeldung.p12 -validity 3650

 https://mkyong.com/spring-boot/spring-boot-ssl-https-examples/

 $ keytool -genkeypair -keyalg RSA -keysize 2048 -storetype PKCS12 -keystore mkyong.p12 -validity 365

 

https://letsencrypt.org/ru/getting-started/

https://certbot.eff.org/lets-encrypt/ubuntubionic-other 

sudo certbot certonly --standalone

 https://dzone.com/articles/spring-boot-secured-by-lets-encrypt

 /etc/letsencrypt/live/asdf.pp.ua# openssl pkcs12 -export -in fullchain.pem -inkey privkey.pem -out keystore.p12 -name tomcat -CAfile chain.pem -caname root

Time Complexity

https://medium.com/@ariel.salem1989/an-easy-to-use-guide-to-big-o-time-complexity-5dcf4be8a444

O(1) — Constant Time

O(N)—Linear Time

O(log(n)) — Logarithmic Time

O(N²) — Quadratic Time

O(2^N) — Exponential Time