Mysql on Micha Kops' Tech Notes

Quick Apache NiFi Setup with Docker

Tue, 08 Feb 2022 00:00:00 +0100

Steps

Pull image and run with ports exposed:

docker run --name "nifi" -p 8443:8443 -d apache/nifi:latest

Fetch the generated username and password from the logs:

docker logs nifi | grep -A1 "Generated Username"

Generated Username [8f6d91f7-733e-40cf-b900-059ea9dccbf2]
Generated Password [v7KGiiRYLJL2+HzhKOqz1rbgiPOaWz0B]

Now we may enter the https://localhost:8443/nifi/login in our browser, accept the security exemption and login with the credentials from above, voila!

Installing additional connectors

I have found a nice summary on the following GitHub repository:

MySQL and phpMyAdmin Setup with Docker-Compose

Fri, 14 May 2021 00:00:00 +0200

Goals

Setup mySQL with phpMyAdmin connected using docker-compose (for development purpose)

Prerequisites

docker-compose installed

Setup

This is our docker-compose.yml:

version: '3.2'

services:
   db:
      image: mysql:8.0
      container_name: mysql-container
      restart: always
      ports:
       - '6603:3306'
      environment:
        MYSQL_ROOT_PASSWORD: 12345678

   app:
      depends_on:
       - db
      image: phpmyadmin/phpmyadmin
      container_name: phpmyadmin
      restart: always
      ports:
       - '8080:80'
      environment:
        PMA_HOST: db

Running

docker-compose up
Starting mysql-container ... done
Starting phpmyadmin      ... done
Attaching to mysql-container, phpmyadmin
[..]

We may now login using the following ultra-secure credentials ;) User: root, Password: 12345678

WordPress Docker Setup

Fri, 14 May 2021 00:00:00 +0200

Goals

Run WordPress via Docker / Docker-Compose
Increase the Upload Filesize Limit

Create Docker Compose Configuration

Create a docker-compose.yml:

version: '3.1'

services:

  wordpress:
    image: wordpress
    restart: always
    ports:
      - 8080:80
    environment:
      WORDPRESS_DB_HOST: db
      WORDPRESS_DB_USER: exampleuser
      WORDPRESS_DB_PASSWORD: examplepass
      WORDPRESS_DB_NAME: exampledb
    volumes:
      - wordpress:/var/www/html

  db:
    image: mysql:5.7
    restart: always
    environment:
      MYSQL_DATABASE: exampledb
      MYSQL_USER: exampleuser
      MYSQL_PASSWORD: examplepass
      MYSQL_RANDOM_ROOT_PASSWORD: '1'
    volumes:
      - db:/var/lib/mysql

volumes:
  wordpress:
  db:

Run Docker Compose / Start Containers

docker-compose up
WARNING: Found orphan containers (wordpress-docker_phpmyadmin_1) for this project. If you removed or renamed this service in your compose file, you can run this command with the --remove-orphans flag to clean it up.
Starting wordpress-docker_db_1        ... done
Starting wordpress-docker_wordpress_1 ... done
Attaching to wordpress-docker_db_1, wordpress-docker_wordpress_1
[..]
db_1         | 2021-04-03T18:58:17.247963Z 0 [Note] mysqld: ready for connections.
db_1         | Version: '5.7.33'  socket: '/var/run/mysqld/mysqld.sock'  port: 3306  MySQL Community Server (GPL)

Docker Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Restrict Network

Can be useful when using a third-party image that we do not trust

Run with no network

docker run --network none <image>

Run with private isolated network

At least containers attached to this network can talk with another

docker network create --internal my_isolated_network
docker run --network my_isolated_network <image>

Block using firewall

e.g. using iptables or ipfw

# Get container's IP
docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' <container_name>

# Block all outbound connections from that IP
sudo iptables -I DOCKER-USER -s <container_ip> -j DROP

SQL Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Count unique / all values

SELECT COUNT(DISTINCT <FIELDNAME>), COUNT(ALL <FIELDNAME>) FROM <TABLE>;

Partially anonymize e-mail addresses

UPDATE <TABLE_NAME>
SET <EMAIL_FIELD>=
INSERT(
<EMAIL_FIELD>,
POSITION('@' IN <EMAIL_FIELD>),
100,
CONCAT(FLOOR(1 + (RAND() * 100)),'@hascode.com'))
WHERE
POSITION('@' IN <EMAIL_FIELD>)>0;

Find duplicate entries

SELECT COUNT(*), <FIELDNAME> FROM <TABLENAME>
GROUP BY <FIELDNAME>
HAVING COUNT(*)>1;

MySQL Fix Zero Dates for Data Imports

Error: ERROR 1067 (42000) at line 1234: Invalid default value for ‘datefield’

In newer MySQL Versions zero in date or zero dates are forbidden .. check this with: