ubuntu16 kubernetes 1.9.2 集群

参考官方文档
Using kubeadm to Create a Cluster

记得半年前也捣鼓过一次kubernetes的集群，看别人的文章容易踩坑，今天又踩了！！现在记录一下！！

环境说明：

我是在虚拟机上安装的，宿主机是win，两个ubuntu16.04虚拟机，通过nat方式已经可以上网。
两台虚拟机的ip分别是:
master（c）:192.168.217.129
slave（c2）:192.168.217.130

Step1: install docker ce

apt-get update
apt-get install -y \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
add-apt-repository \
   "deb https://download.docker.com/linux/$(. /etc/os-release; echo "$ID") \
   $(lsb_release -cs) \
   stable"
apt-get update && apt-get install -y docker-ce=$(apt-cache madison docker-ce | grep 17.03 | head -1 | awk '{print $3}')

Step2: install kubenetes

apt-get update && apt-get install -y apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl

Step3: initialize via kubeadm

master ops:

kubeadm reset #optinal, if you want to flush all of the old settings
kubeadm init  --pod-network-cidr=10.244.0.0/16 #wait a few minutes

then, you will see logs:

...
To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

You can now join any number of machines by running the following on each node
as root:

  kubeadm join --token 31e3a7.afe7ade149e2c2fc 192.168.217.129:6443 --discovery-token-ca-cert-hash sha256:0b226ad3b722f2f39a357526f056da97d211053f70afea0a71e30c9b2292a1**

tips: $HOME/.kube is your kube config diretory, rm if you have old config

and then run commands

mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Step4: install network addon:

sysctl net.bridge.bridge-nf-call-iptables=1
kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml

check pods, a ready sample:

$ kubectl get pods --all-namespaces
NAMESPACE     NAME                        READY     STATUS    RESTARTS   AGE
default       redis-master-hz4vq          1/1       Running   0          38m
kube-system   etcd-c                      1/1       Running   0          43m
kube-system   kube-apiserver-c            1/1       Running   0          43m
kube-system   kube-controller-manager-c   1/1       Running   0          43m
kube-system   kube-dns-6f4fd4bdf-sbjdl    3/3       Running   0          44m
kube-system   kube-flannel-ds-v6kc4       1/1       Running   0          43m
kube-system   kube-flannel-ds-zjnlk       1/1       Running   1          39m
kube-system   kube-proxy-47qjv            1/1       Running   0          39m
kube-system   kube-proxy-s9crw            1/1       Running   0          44m
kube-system   kube-scheduler-c            1/1       Running   0          43m

Step5: repeat operations

in other nodes of your kubenetes cluster, repeat Step1&Step2 to prepare environment.

then, root user:

kubeadm join --token 31e3a7.afe7ade149e2c2fc 192.168.217.129:6443 --discovery-token-ca-cert-hash sha256:0b226ad3b722f2f39a357526f056da97d211053f70afea0a71e30c9b2292a1**

now the cluster is ready， in master，you can see

 $ kubectl get nodes
NAME      STATUS    ROLES     AGE       VERSION
c         Ready     master    45m       v1.9.2
c2        Ready     <none>    40m       v1.9.2