- Docker allows for OS-level virtualization of applications into lightweight isolated containers. Docker Hub is used to store and distribute Docker images. - Rancher provides tools for orchestrating Docker containers across multiple hosts. The Rancher Catalog allows deploying Dockerized applications in a standardized way using templates that prompt for configurable options. - The document discusses using Docker and Rancher together to build, deploy, manage and scale containerized applications both on a single host and across multiple hosts for production use.

1. Alin Voinea
Eau de Web, Romania
Docker & Rancher
Docker Hub, Rancher Catalog

2. Summary
● Docker
○ Docker Hub
● Rancher
○ Rancher Catalog

3. What is Docker?
● OS level virtualization - “containerization”
● First released in 2013 - Solomon Hykes - dotCloud
● Maintained and and developed by Docker Inc.
● Lightweight than virtual machines
● Single operating-system kernel
● Portable
● Scalable
● Stackable

4. Running Applications w/ Docker
$ docker run plone:5
$ docker run eeacms/eionet:5.1-1.0
$ docker run registry.gitlab.com/avoinea/docker:3.5

5. Custom Docker Image: Dockerifle
FROM plone:5.1.5
RUN apt-get update
&& apt-get install -y --no-install-recommends libldap2-dev libssl-dev
&& rm -rf /var/lib/apt/lists/*
COPY site.cfg /plone/instance/
COPY docker-entrypoint.sh
RUN gosu plone buildout -c site.cfg
HEALTHCHECK --interval=1m --timeout=5s --start-period=1m
CMD curl -f http://localhost:8080/ || exit 1
ENTRYPOINT [“/plone/instance/docker-entrypoint.sh”]

6. Custom Docker Image: docker-entrypoint.sh
#!/bin/bash
set -e
# Make sure that the application can write within data volume
chown -R plone:plone /data
# Move the main application to `PID 1` by using `exec`
# Use a non-root user to start your app
exec gosu plone bin/instance "$@"

7. Build Docker Image: devel
$ docker build -t eionet-dev /path/to/Dockerfile
$ docker run -p 8080:8080 eionet-dev

8. Build Docker Image: production
$ docker push eeacms/eionet
$ git tag 5.1-1.0
$ git push --tags

9. $ docker-compose up
$ docker-compose down
$ docker-compose down -v
Orchestration: Single host

10. $ docker-compose up -d
$ docker-compose scale plone=3
version: "2"
services:
plone:
image: eeacms/eionet:5.1-1.0
environment:
- ZEO_ADDRESS=zeo:8100
zeo:
image: plone:5.1.5
command: zeoserver
volumes:
- data:/data
volumes:
data:
driver: local
Orchestration: docker-compose
docker-compose.yml

11. Orchestration: Multiple host

12. version: "2"
services:
plone:
scale: 2
health_check:
healthy_threshold: 2
response_timeout: 2000
port: 8080
unhealthy_threshold: 3
interval: 5000
strategy: recreate
request_line: GET /
zeo:
scale: 1
health_check:
...
version: "2"
services:
plone:
mem_reservation: 1g
mem_limit: 2g
labels:
io.rancher.scheduler.affinity:host_label: backend=yes
io.rancher.scheduler.affinity:host_label_ne: reserved=yes
io.rancher.scheduler.affinity:container_label_soft_ne:
io.rancher.stack_service.name=$${stack_name}/$${service_name}
eu.europa.eionet.plone: true
…
volumes:
data:
driver: rancher-ebs / netapp / rancher-nfs / local
driver-opts:
size: 1g
volumeType: gp2
docker-compose.yml rancher-compose.yml
Orchestration: rancher-compose

13. version: "2"
catalog:
name: "Eionet - WWW"
description: "Eionet Plone 5 website"
version: "5.1-1.0"
questions:
- variable: "HOST_LABELS"
label: "Do not schedule services on
these hosts"
description: "List of host labels”
type: "string"
required: true
default: "reserved=yes"
- variable: "TZ"
...
version: "2"
services:
plone:
labels:
io.rancher.scheduler.affinity:host_label_ne:
${HOST_LABELS}
…
volumes:
data:
driver: ${DATA_VOLUME_DRIVER}
driver-opts:
{{.Values.DATA_VOLUME_DRIVER_OPTS}}
docker-compose.yml rancher-compose.yml
Rancher Catalog

14. $ rancher catalog ls
$ rancher catalog install
--name www-eionet-demo
--answers /path/to/answers.txt
EEA:www-eionet:1
Rancher Catalog: CLI & Web UI

15. Rancher Catalog: answers.txt

16. Rancher Catalog: Upgrades & Roll-back

17. Rancher Load Balancer
● Service rules
● Selector rules

18. Thank you!
● EEA Rancher Catalog:
○ github.com/eea/eea.rancher.catalog
● Documentation
○ docker.com
○ rancher.com
● Examples
○ github.com/eea?q=docker