Example of using docker bridge networking

docker-bridge-example.bash

#!/bin/bash

PS4='+\[\033[01;34m\](${BASH_SOURCE[0]}:${LINENO})\[\033[00m\]: ${FUNCNAME[0]:+\[\033[01;33m\]${FUNCNAME[  0]}()\[\033[00m\]: }'

set -eu

# Tear Down previous run
{
  docker container rm -f db client || true
  docker network rm majidi || true
} 2>/dev/null

# Setup network
docker network create majidi

db_password="sekret${RANDOM}"

function banner() {
  echo
  echo "================================================"
  echo "$*"
  echo
}

function is_db_up() {
  echo 'SELECT 1;' |
    docker run \
      "--name=client" \
      "--network=majidi" \
      "--rm" \
      "--interactive" \
      mariadb:latest \
      mysql \
      "--host=db" \
      "--user=root" \
      "--password=${db_password}" \
      mysql
}

banner "Using 'root' password: ${db_password}"

banner "Starting the container with the name and hostname 'db'..."
docker run \
  "--name=db" \
  "--network=majidi" \
  "--env=MYSQL_ROOT_PASSWORD=${db_password}" \
  "--detach" \
  mariadb:latest

while ! is_db_up; do
  echo "waiting for 'db' to start..."
  sleep 1
done
banner "The database is started!"

banner "This is a mysql client into the MariaDB running in another client."
echo 'SELECT TABLE_NAME, TABLE_TYPE FROM TABLES ORDER BY TABLE_NAME LIMIT 10;' |
  docker run \
    --name=client \
    --network=majidi \
    --rm \
    --interactive \
    mariadb:latest \
    mysql \
    "--host=db" \
    "--user=root" \
    "--password=${db_password}" \
    information_schema

# EOF