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

Docker

docker ps

docker ps -a (all)

docker ps -l (latest exited)

docker exec -it acc357f011f4 psql -U testuser testdb

# \dt

Schema | Name | Type  |  Owner   

--------+------+-------+----------

 public | asdf | table | testuser

 

docker images

docker ps --format $FORMAT

docker run -ti ubuntu:latest  bash

https://docs.docker.com/install/linux/docker-ce/ubuntu/#install-docker-engine---community-1

https://docs.docker.com/engine/examples/postgresql_service/

https://dev.mysql.com/doc/mysql-installation-excerpt/8.0/en/docker-mysql-getting-started.html#docker-starting-mysql-server

docker ps -a
docker pull mysql/mysql-server:tag
docker run  -P -p 3308:3306 --name=mysql3308 -d mysql/mysql-server:5.7
docker logs mysql3308 | grep GENERATED
docker exec -it mysql1 mysql -uroot -p

ALTER USER 'root'@'localhost' IDENTIFIED BY '12345';

CREATE USER 'asdf'@'%' IDENTIFIED BY '12345';

GRANT ALL PRIVILEGES ON *.* TO 'asdf'@'%' WITH GRANT OPTION;


#########################################
https://dev.mysql.com/doc/mysql-installation-excerpt/8.0/en/docker-mysql-getting-started.html#docker-starting-mysql-server

https://stackoverflow.com/questions/50177216/how-to-grant-all-privileges-to-root-user-in-mysql-8-0

SELECT host, user FROM user ;

CREATE USER 'asdf'@'%' IDENTIFIED BY '12345';

GRANT ALL PRIVILEGES ON *.* TO 'asdf'@'%' WITH GRANT OPTION;

https://docs.docker.com/engine/examples/postgresql_service/

#############################33

docker-compose.yaml

version: '3.1'

services:

  db:
    image: postgres
    restart: always
    environment:

      POSTGRES_USER: usr
      POSTGRES_PASSWORD: pwd
      POSTGRES_DB: test     
    ports:
      - "5433:5432"

docker + postgres (amigoscode)

https://youtu.be/9i1gQ7w2V24?t=1590