Docker swarm

TOPICS

```
Container Orchestration
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```
Docker Swarm Intro
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```
Key Concepts
```

Clustering

Scheduling

Fault Tolerance

Load Balancing

Scaling

Application
Deployments

Features

SWARM

Kubernetes

Mesos and Marathon

orchestrators

swarm

```
Native Docker Orchestration Engine
```
```
May become a norm in future 
```
```
Compatible with Docker Compose
```
```
Integrated with Docker Engine and CLI
```

KEY CONCEPTS

```
Architecture
```
```
Services
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```
Scheduling 
```
```
Networking
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Load Balancing 
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Fault Tolerance 
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Zero Downtime Deployment
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gossip

raft

managers

workers

services

```
Unit of deployment
```
```
One or more containers
```
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Global or Replicated
```

replicated

replicas = 5

global

```
one per node
```

useful to setup monitoring, logging agents etc.

scheduling

node1

node2

node3

```
resource aware
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```
spreads by default
```
```
placement constraints can be defined
```

 deploy:
      placement:
        constraints:
          - node.role == worker
          - node.labels.env = staging
          - node.hostname != node-2
          - engine.labels.os == opensuse

placement constraints

networking

node1

node2

node3

bridge

overlay

```
overlay
```
```
ingress
```
```
docker_gwbridge
```

swarm LB

swarm LB

swarm LB

published port

External Load Balancer

load balancing

node1

node2

node3

fault tolerance

node1

node2

node3

fault tolerance

node1

node2

node3