/docker-swarm-setup

Docker swarm cluster setup and running instructions.

Docker-Swarm-Setup

For centOS7 && Docker version 19.03.12

1. set up hosts static IP

sudo vim /etc/hosts

192.168.89.102  managernode
192.168.89.103  workernode1
192.168.89.104  workernode2

2. Set up IP address

Manager node:

sudo hostnamectl set-hostname managernode

Worker node1:

sudo hostnamectl set-hostname workernode1

Worker node2

sudo hostnamectl set-hostname workernode2

3. Fire wall

sudo firewall-cmd --permanent --add-port=2376/tcp
sudo firewall-cmd --permanent --add-port=2377/tcp
sudo firewall-cmd --permanent --add-port=7946/tcp
sudo firewall-cmd --permanent --add-port=80/tcp
sudo firewall-cmd --permanent --add-port=7946/udp
sudo firewall-cmd --permanent --add-port=4789/udp

4. Reload Docker and firewall

sudo firewall-cmd --reload
sudo systemctl restart docker

5. Config cluster

Manager node

sudo docker swarm init --force-new-cluster

Worker node

Docker swarm uses port 2377 by default.

sudo swarm join --token <token> <MANAGER_IP_ADDRESS>:2377