What's New in Docker 1.12 by Nishant Totla for Docker SF Meetup 08.03.16

What’s New in Docker 1.12

Docker MeetupAugust 3, 2016

Nishant Totla@[email protected]

Overview of new features• Orchestration• Swarm mode• Docker services• Secure by default• Networking

• Live Restore• Container Healthchecks• Plugin Improvements

Swarm Mode• Your Docker Engine is now cluster-aware• The best way to orchestrate Docker is Docker• Really easy to set up your cluster and manage deployments

Swarm Mode

$ docker swarm init

Engine

Swarm mode

$ docker swarm init

$ docker swarm join <manager IP>:2377

Engine Engine

Swarm mode

$ docker swarm init

$ docker swarm join <manager IP>:2377

Engine Engine

Engine

Engine

Engine

Services

$ docker service create \

--replicas 3 \

--name frontend \

--network mynet \

--publish 80:80/tcp \

frontend_image:latest

Engine Engine

Engine

Engine

Engine

mynet

Services


--name redis \

--network mynet \

redis:latest

Engine Engine

Engine

Engine

Engine

mynet

Node Failure


--name redis \

--network mynet \

redis:latest

Engine Engine

Engine

Engine

Engine

mynet

Desired State ≠ Actual State

Engine

Engine

Engine

Engine

mynet


--replicas 3 \

--name frontend \

--network mynet \



Converge back to Desired State

Engine

Engine

Engine

Engine

mynet


--replicas 3 \

--name frontend \

--network mynet \



Service Scaling

Engine

Engine

Engine

Enginemynet

$ docker service scale frontend=6

Global Services


--mode=global \

--name=prometheus \

prom/prometheus

Engine Engine

Engine

Engine

Engine

Constraints

Engine Engine

Engine

Engine

Engine $ docker daemon --label

com.example.storage=“ssd”

$ docker daemon --label


Constraints


--replicas 5 \

--name frontend \

--network mynet \


--constraint engine.labels.com.example.storage==ssd


Engine Engine

Engine

Engine

Engine

mynet





Constraints

Engine Engine

Engine

Engine

Engine

mynet





$ docker service scale frontend=10

Rolling Updates


--replicas 8 \

--name frontend \

--network mynet \


frontend_image:v1.0

Engine Engine

Engine

Engine

Engine

mynet

Rolling Updates

$ docker service update \

--image frontend_image:v2.0 \

--update-delay 10s \

--update-parallelism 2 \

frontend

Engine Engine

Engine

Engine

Engine

mynet

Secure by Default with end to end Encryption• Cryptographic node

identity• Automatic encryption

and mutual auth (TLS)• Automatic certificate

rotation• External CA integration

Manager[TLS][CA]

Manager[TLS][CA]

Manager[TLS][CA]

Agent[TLS]

Agent[TLS]

Agent[TLS]

Routing Mesh• Operator reserves a

swarm-wide ingress port (8080) for myapp

• Every node listens on 8080

Manager

Agent 1 Agent 2 Agent 3


--replicas 3 \

--name frontend \

--network mynet \



:8080 :8080 :8080

:8080

access

myapp.com:8080

Routing Mesh• Container-aware

routing mesh can transparently reroute traffic to a node that is running the container• Built-in (layer 4)

load balancing• DNS-based service

discovery

Manager

Agent 1 Agent 2 Agent 3


--replicas 3 \

--name frontend \

--network mynet \



:8080 :8080 :8080

:8080

access

myapp.com:8080

Swarm Mode is Optional• Docker 1.12 is fully backwards compatible• You can continue to use your old deployments without Swarm Mode• Swarm Mode is now the easiest way to try orchestration with Docker

Live Restore

{

“live-restore”: true

}

• By default, terminating Docker daemon shuts down running containers• Starting with 1.12, it is possible to configure the daemon so that containers

remain running when daemon becomes unavailable• Useful for upgrades, planned outages, crashes• Either update the default configuration file

• Or pass a flag when starting the daemon

$ sudo dockerd --live-restore

Container Healthchecks in Dockerfile

• Checks every 5 minutes that web server can return index page within 3 seconds• Three consecutive failures puts container in an unhealthy state• Works with services in Swarm Mode

HEALTHCHECK --interval=5m --timeout=3s

--retries=3

CMD curl –f http://localhost/ || exit 1

New Plugin Subcommands (Experimental)

$ docker plugin install tiborvass/no-remove

$ docker plugin enable no-remove

$ docker plugin disable no-remove

Plugin Permissions Model

$ docker plugin install tiborvass/no-remove

Plugin “tiborvass/no-remove:latest” requested the following

privileges:

- Networking: host

- Mounting host path: /data

Do you grant the above permissions? [y/N]

Thank You! Questions?

Nishant Totla@[email protected]

Docker for AWS/Azure

Sign up for the beta at beta.docker.com

Swarm Topology

Overview of new features

• Strongly consistent – holds desired state• Simple to operate• Fast (in-memory reads, domain specific indexing, …)• Secure

Overview of new features

• Eventually consistent – routing mesh, load balancing rules, …• High volume, p2p network between workers• Secure: symmetric encryption with key rotation in Raft

What's New in Docker 1.12 by Nishant Totla for Docker SF Meetup 08.03.16

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