Failed to dial to Docker socket while deploy etcd

[qianxiaoming]

RKE version:
v0.1.1

Docker version: (docker version,docker info preferred)
Client:
Version: 17.03.2-ce
API version: 1.27
Go version: go1.7.5
Git commit: f5ec1e2
Built: Tue Jun 27 02:21:36 2017
OS/Arch: linux/amd64

Server:
Version: 17.03.2-ce
API version: 1.27 (minimum version 1.12)
Go version: go1.7.5
Git commit: f5ec1e2
Built: Tue Jun 27 02:21:36 2017
OS/Arch: linux/amd64
Experimental: false

Operating system and kernel: (cat /etc/os-release, uname -r preferred)
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"

kernel version: 3.10.0-693.11.1.el7.x86_64

Type/provider of hosts: (VirtualBox/Bare-metal/AWS/GCE/DO)
private cloud envirment

cluster.yml file:

nodes:

• address: a4
  user: root
  role: [worker]
• address: a5
  user: root
  role: [worker]
• address: a6
  user: root
  role: [worker]
• address: a7
  user: root
  role: [etcd]
• address: a8
  user: root
  role: [controlplane]

services:
etcd:
image: quay.io/coreos/etcd:latest
kube-api:
image: rancher/k8s:v1.8.3-rancher2
kube-controller:
image: rancher/k8s:v1.8.3-rancher2
scheduler:
image: rancher/k8s:v1.8.3-rancher2
kubelet:
image: rancher/k8s:v1.8.3-rancher2
kubeproxy:
image: rancher/k8s:v1.8.3-rancher2

Steps to Reproduce:
./rke up

Results:
INFO[0000] Building Kubernetes cluster
INFO[0000] [dialer] Setup tunnel for host [a7]
FATA[0000] Failed to set up SSH tunneling for Etcd host [a7]: Can't retrieve Docker Info: error during connect: Get http://%2Fvar%2Frun%2Fdocker.sock/v1.24/info: Failed to dial to Docker socket: ssh: rejected: administratively prohibited (open failed)

by the way: selinux is enforcing

[moelsayed]

Please check #93

[qianxiaoming]

Thanks! It works for CentOS 7.4.