Docker Clustering with Swarm in Centos7

Installing Docker
mkdir /install-files ; cd /install-files

wget https://yum.dockerproject.org/repo/main/centos/7/Packages/docker-engine-1.13.1-1.el7.centos.x86_64.rpm

wget https://yum.dockerproject.org/repo/main/centos/7/Packages/docker-engine-selinux-1.13.1-1.el7.centos.noarch.rpm

#package for docker-engine-selinux
yum install -y policycoreutils-python
rpm -i docker-engine-selinux-1.13.1-1.el7.centos.noarch.rpm

#package for docker-engine
yum install -y libtool-ltdl libseccomp
rpm -i docker-engine-1.13.1-1.el7.centos.x86_64.rpm

#remove rpm packages
rm docker-engine-* -f

#enable systemd service
systemctl enable docker

#start docker
systemctl start docker

firewall-cmd --permanent --add-source=192.168.56.0/24
firewall-cmd --permanent --add-port=2377/tcp
firewall-cmd --permanent --add-port=7946/tcp
firewall-cmd --permanent --add-port=7946/udp
firewall-cmd --permanent --add-port=4789/udp
firewall-cmd --reload

Firewalld
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-using-firewalld-on-centos-7

firewall-cmd --get-active-zones
firewall-cmd --list-all
firewall-cmd --zone=public --add-port=2377/tcp --permanent


systemctl enable docker;
systemctl restart docker

Docker Cluster Env

docker swarm init --advertise-addr=192.168.56.105
Swarm initialized: current node (b4b79zi3t1mq1572r0iubxdhc) is now a manager.


To add a worker to this swarm, run the following command:
    docker swarm join \
    --token SWMTKN-1-1wcz7xfyvhewvj3dd4wcbhufw4lub3b1vgpuoybh90myzookbf-4ksxoxrilifb2tmvuligp9krs \
    192.168.56.101:2377
To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.


To join as a Swarm manager

docker swarm join-token manager
  docker swarm join \
    --token SWMTKN-1-10cqx6yryq5kyfe128m2xhyxzplsc90lzksqggmscv1nfipsbb-bfdbvfhuw9sg8mx2i1a4rkvlv \
    192.168.56.101:2377