Docker & Kubernetes snippets

copy-all.sh

#Copy docker images from a registry to another one given a pattern

#!/bin/bash

SRC_REGISTRY=localhost:5000
DST_REGISTRY=public.ecr.aws/xxxxxxx
NEW_TAG=latest

docker images --format "{{.ID}} {{.Repository}}" | while read line; do
  pieces=($line)
  if [[ "${pieces[1]}" == *"${SRC_REGISTRY}"* ]]; then
    IMAGE_NAME=$(echo "${pieces[1]}" | sed -e "s|^${SRC_REGISTRY}/||")
    NEW_IMAGE_NAME="${DST_REGISTRY}/${IMAGE_NAME}:${NEW_TAG}"
    docker tag "${pieces[0]}" $NEW_IMAGE_NAME
    docker push $NEW_IMAGE_NAME
  fi
 done

docker-compose-wait-for.yaml

# Docker Compose service wait for postgresql db to be up and ready accepting connections

version: '3.4'

services:

  web:
    image: my-web-app
    build:
      context: .
      dockerfile: Dockerfile
    depends_on:
      # wait for dependency to be healthy, as defined in the dependency healthcheck
      db:
        condition: service_healthy

  db:
    image: postgres:12.4-alpine
    ports:
      - 5432:5432
    volumes:
      - ./db/data:/var/lib/postgresql/data
    environment: 
      POSTGRES_DB: ${DB_NAME}
      POSTGRES_USER: ${DB_USER}
      POSTGRES_PASSWORD: ${DB_PASSWORD}
    # run the healthcheck every 5 seconds (5s timeout) up to 10 times
    healthcheck:
      test: "psql --list -U $DB_USER"
      interval: 5s
      timeout: 5s
      retries: 10