KeyCloak

KeyCloak is "an open source identity and access management solution". Using a local database, or a variety of backends (think OpenLDAP), you can provide Single Sign-On (SSO) using OpenID, OAuth 2.0, and SAML. KeyCloak's OpenID provider can be used in combination with Traefik Forward Auth, to protect vulnerable services with an extra layer of authentication.

Ingredients

!!! Summary Existing:

* [X] [Docker swarm cluster](/ha-docker-swarm/design/) with [persistent shared storage](/ha-docker-swarm/shared-storage-ceph/)
* [X] [Traefik](/ha-docker-swarm/traefik) configured per design
* [X] DNS entry for the hostname (_i.e. "keycloak.your-domain.com"_) you intend to use, pointed to your [keepalived](/ha-docker-swarm/keepalived/) IP

Preparation

Setup data locations

We'll need several directories to bind-mount into our container for both runtime and backup data, so create them as follows

mkdir -p /var/data/runtime/keycloak/database
mkdir -p /var/data/keycloak/database-dump

Prepare environment

Create /var/data/config/keycloak/keycloak.env, and populate with the following variables, customized for your own domain structure.

# Technically, this could be auto-detected, but we prefer to be prescriptive
DB_VENDOR=postgres
DB_DATABASE=keycloak
DB_ADDR=keycloak-db
DB_USER=keycloak
DB_PASSWORD=myuberpassword
KEYCLOAK_USER=admin
KEYCLOAK_PASSWORD=ilovepasswords

# This is required to run keycloak behind traefik
PROXY_ADDRESS_FORWARDING=true

# What's our hostname?
KEYCLOAK_HOSTNAME=keycloak.batcave.com

# Tell Postgress what user/password to create
POSTGRES_USER=keycloak
POSTGRES_PASSWORD=myuberpassword

Create /var/data/config/keycloak/keycloak-backup.env, and populate with the following, so that your database can be backed up to the filesystem, daily:

PGHOST=keycloak-db
PGUSER=keycloak
PGPASSWORD=myuberpassword
BACKUP_NUM_KEEP=7
BACKUP_FREQUENCY=1d

Setup Docker Swarm

Create a docker swarm config file in docker-compose syntax (v3), something like this:

--8<-- "premix-cta.md"

version: '3'

services:
  keycloak:
    image: jboss/keycloak
    env_file: /var/data/config/keycloak/keycloak.env
    volumes:
      - /etc/localtime:/etc/localtime:ro
    networks:
      - traefik_public
      - internal
    deploy:
      labels:
        - traefik.frontend.rule=Host:keycloak.batcave.com
        - traefik.port=8080
        - traefik.docker.network=traefik_public

  keycloak-db:
    env_file: /var/data/config/keycloak/keycloak.env
    image: postgres:10.1
    volumes:
      - /var/data/runtime/keycloak/database:/var/lib/postgresql/data
      - /etc/localtime:/etc/localtime:ro
    networks:
      - internal

  keycloak-db-backup:
    image: postgres:10.1
    env_file: /var/data/config/keycloak/keycloak-backup.env
    volumes:
      - /var/data/keycloak/database-dump:/dump
      - /etc/localtime:/etc/localtime:ro
    entrypoint: |
      bash -c 'bash -s <<EOF
      trap "break;exit" SIGHUP SIGINT SIGTERM
      sleep 2m
      while /bin/true; do
        pg_dump -Fc > /dump/dump_\`date +%d-%m-%Y"_"%H_%M_%S\`.psql
        (ls -t /dump/dump*.psql|head -n $$BACKUP_NUM_KEEP;ls /dump/dump*.psql)|sort|uniq -u|xargs rm -- {}
        sleep $$BACKUP_FREQUENCY
      done
      EOF'
    networks:
      - internal

networks:
  traefik_public:
    external: true
  internal:
    driver: overlay
    ipam:
      config:
        - subnet: 172.16.49.0/24

!!! note Setup unique static subnets for every stack you deploy. This avoids IP/gateway conflicts which can otherwise occur when you're creating/removing stacks a lot. See my list here.

Serving

Launch KeyCloak stack

Launch the KeyCloak stack by running docker stack deploy keycloak -c <path -to-docker-compose.yml>

Log into your new instance at https://YOUR-FQDN, and login with the user/password you defined in keycloak.env.

--8<-- "recipe-footer.md"

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