flannal+kubernetes+docker

# Deploy flannal with kubernetes on Centos

# turn off the firewall
systemctl disable firewalld && systemctl stop firewalld

# install docker && start docker
yum install -y docker 
systemctl enable docker && systemctl start docker

# install kubernetes(kubeadm, kubelet and kubectl) && start 
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
EOF

# Disabling SELinux
setenforce 0

yum install -y kubelet kubeadm kubectl
systemctl enable kubelet && systemctl start kubelet

# ensure iptables 
cat <<EOF >  /usr/lib/sysctl.d/00-system.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sysctl --system

echo 1 > /proc/sys/net/ipv4/ip_forward

# check cgroups
docker info | grep -i cgroup
cat /etc/systemd/system/kubelet.service.d/10-kubeadm.conf | grep -i cgroup

# restart to validate changes
systemctl daemon-reload
systemctl restart kubelet

# init 
kubeadm init --pod-network-cidr=10.244.0.0/16

# enable master node being scheduled
export KUBECONFIG=/etc/kubernetes/admin.conf
kubectl taint nodes --all node-role.kubernetes.io/master:NoSchedule-

# flannal
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.10.0/Documentation/kube-flannel.yml