Talk at T3DD16

2. VIRTUALIZATION
HOST OS (MAC, WINDOWS, LINUX)
HYPERVISOR (VBOX, VMWARE, PARALLELS)
GUEST OS GUEST OS GUEST OS
WEBSERVER WEBSERVER WEBSERVER

3. DRAWBACKS
▸ Full guest OS (lots of software you don't need)
▸ Hardware simulation
▸ CPU (Scheduling, Protection ring)
▸ Memory (Virtual memory mapping)
▸ Disk
▸ Boot time
▸ Installation time

4. DOCKER
HOST OS (MAC, WINDOWS, LINUX)
CONTAINER ENGINE
WEBSERVER WEBSERVER WEBSERVER

5. KERNEL
WRITABLE CONTAINER APP
DEBIAN - IMAGE
ADD APACHE - IMAGE
ADD PHP-FPM - IMAGE
ADD PROJECT FILES - IMAGE
WRITABLE CONTAINER DB
CENTOS - IMAGE
ADD MYSQL - IMAGEPort 3306
Port 80
/opt/data/fileadmin
/app/web/fileadmin
/app/web/uploads
/opt/data/uploads

6. DOCKER CONTAINER
▸ A running instance of an image
▸ Has its own disk
▸ Has its own network
▸ Can expose ports to the host
▸ Runs a single process
▸ Resources (CPU, Memory) directly from the host
▸ Is not persistent!

7. DOCKER IMAGE
▸ Is based on another docker image
▸ Contains a projection of the complete filesystem
▸ Can be versionized
▸ Share the same layers (binary) with their base images
▸ Easy exchangeable

8. CONFIGURE DOCKERIZED SOFTWARE
▸ Handled by environment variables
▸ Variables are declared during runtime
▸ Default variables maybe encoded in the image
▸ Overwrite configuration files via mounted files
if (getenv('MYSQL_USER')) {
$GLOBALS['TYPO3_CONF_VARS']['DB']['username'] = getenv('MYSQL_USER');
}
if (getenv('MYSQL_PASSWORD')) {
$GLOBALS['TYPO3_CONF_VARS']['DB']['password'] = getenv('MYSQL_PASSWORD');
}

9. DOCKER COMPOSE
app:
image: hhoechtl/t3dd16:typo3
links:
- mysql
ports:
- "80:80"
- "443:443"
- "10022:22"
volumes:
- /opt/fileadmin:/app/web/fileadmin
- uploads:/app/web/uploads
env_file:
- etc/environment.yml
- etc/environment.production.yml
mysql:
image: hhoechtl/t3dd16:db
volumes:
- db:/var/lib/mysql
env_file:
- etc/environment.yml
- etc/environment.production.yml
Servicename (also DNS internally)
Host port
Container internal port
Container internal filesystem
Host filesystem
Engine volume

10. THINGS YOU SHOULD LOOK AT
▸ Dinghy HTTP-Proxy http://bit.ly/2bTm5L6
▸ Project website https://webdevops.io/
▸ Get support on slack https://webdevops.io/slack/
▸ Rancher http://rancher.com/rancher/