[Docker 배우기] Section 9. Container Orchestration - Docker Swarm & Kubernetes

Docker for the Absolute Beginner - Hands On - DevOps | Udemy

 

Container Orchestration is used to host multiple containers over multiple hosts by using scripts and codes.

• Some solution scales containers automatically and even scale hosts

Famous container orchestration solutions:

1. Docker Swarm
2. Kubernetes
3. Mesos

Docker Swarm

Distributes containers over many hosts for higher availability and load balancing

In order to set up a docker swarm, one of the hosts must be a swarm manager while the others are workers.

• Running docker swarm init in the swarm manager starts docker swarm and provides instructions to set up other workers

docker service create --replicas=[number of containers]: runs determined amount of containers distributed across worker nodes

Kubernetes

kubectl run --replicas=[number of containers]: runs replica of container across multiple nodes

• kubectl scale: scales container by a determined amount

Kubernetes can automatically scale up and down based on the load.

• Allows rolling back
• Various authentication methods

 

Nodes are grouped by cluster and it is controlled by the master node.