Rancher / Centos7

Rancher hosts setup on Centos7 machines.

1. Setup firewalld rules for Centos on server
2. only then startup the rancher server
3. Setup firewalld rules for Centos on client
4. only then startup the rancher server

first setup rancher server

docker run -d --restart=unless-stopped -p 8080:8080 rancher/server

on new centos host

yum update

curl -fsSL https://get.docker.com/ | sh

systemctl enable docker

systemctl start docker

systemctl status docker

[root@localhost ~]#  firewall-cmd --zone=public --permanent --add-port=2378/tcp

success

[root@localhost ~]#  firewall-cmd --zone=public --permanent --add-port=6379/tcp

success

[root@localhost ~]#  firewall-cmd --zone=public --permanent --add-port=2888/tcp

success

[root@localhost ~]#  firewall-cmd --zone=public --permanent --add-port=4500/udp

success

[root@localhost ~]#  firewall-cmd --zone=public --permanent --add-port=500/udp

success

[root@localhost ~]#  firewall-cmd --zone=public --permanent --add-port=2181/tcp

success

[root@localhost ~]#  firewall-cmd --zone=public --permanent --add-port=3888/tcp

systemctl restart firewalld

the following ports are needed on both server and client

[root@localhost ~]# firewall-cmd --zone=public --list-ports

500/udp 3888/tcp 2181/tcp 4500/udp 2888/tcp 6379/tcp 2378/tcp

Some useful docker commands:

then paste in the command from rancher UI add Host 

docker ps

docker stop $(docker ps -a -q)

docker rm$(docker ps -a -q)

try restart docker and restart firewall if cannot connect