Uly.me

cloud engineer

Rebuild Docker containers

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How to rebuild your application from scratch using Docker.

#!/bin/bash
docker-compose down -v
docker rmi $(docker images -a -q)
docker-compose up -d
docker-compose restart -t 10

Steps

  • Purge the containers.
  • Delete docker images.
  • Reinitiate docker.
  • Restart docker.

Install Docker on Amazon Linux 2

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Steps how to install Docker and Docker Compose on Amazon Linux 2.

Install Docker

$ sudo amazon-linux-extras install docker
$ sudo service docker start
$ sudo usermod -a -G docker ec2-user

Start at boot.

$ sudo chkconfig docker on

Install git (optional).

$ sudo yum install -y git

Install Docker Compose

$ sudo curl -L https://github.com/docker/compose/releases/latest/download/docker-compose-$(uname -s)-$(uname -m) \
-o /usr/bin/docker-compose
$ sudo chmod +x /usr/local/bin/docker-compose

Check

docker --version
docker-compose --version

Stop and remove all Docker containers

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How to stop and remove all Docker containers.

Stop all containers

$ docker kill $(docker ps -q)

Remove all containers

$ docker rm $(docker ps -a -q)

Delete all docker images

$ docker rmi $(docker images -q)

Github generate a key

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Generate a ssh key for Github

ssh-keygen -t ed25519 -C "your_email@example.com"

Copy and paste the ‘id_ed25519.pub’ key to Github.

cd .ssh
$ ls -l 
-rw-r--r-- 1 ulysses ulysses   537 Jul 14 12:54 id_ed25519
-rw-r--r-- 1 ulysses ulysses   194 Jul 14 12:54 id_ed25519.pub

Go to Settings > SSH and GPG keys. Add new SSH key and authorize.

You can then clone using the SSH format.

$ git init
$ git clone git@github.com:acoount/repo.git

Docker container logs

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How to check Docker container logs. Look for the container ID.

$ docker ps -a
3e2c1193915f

To view the logs for the container.

docker logs 3e2c1193915f
# or
docker container logs 3e2c1193915f

GCP Spot VM

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Spot VMs are preemtible, they can be reclaimed by the Cloud provider.

However you can get deep discounts using them.

Launch a spot instance in GCP using Terraform.

provider "google" {
  project = "airy-totality-151318"
  zone    = "us-central1-c"
}
 
resource "google_compute_instance" "test" {
  name         = "test"
  machine_type = "e2-micro"
 
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }
 
  scheduling {
    preemptible       = true
    automatic_restart = false
  }
 
  network_interface {
    network = "default"
    access_config {
    }
  }
}