kubernetes 环境搭建，ubuntu16.04

通过kubeadm安装kubernetes的教程：

1: 首先在每台机器上安装: docker(1.12), kubeadm(1.6), kubectl, kubelet, kubernetes-cni

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 #将kubernetes的源加入到当前的source list中

EOF

apt-get update

# Install docker if you don't have it already.

apt-get install -y docker-engine

apt-get install -y kubelet kubeadm kubectl kubernetes-cni

~~~~~~~~~~~~~~~~~~~~~~~~

其中docker install 安装注意事项:

https://docs.docker.com/engine/installation/linux/ubuntu/#install-using-the-repository

由于通过k8s管理containers,只需要有docker-engine部分就可以了，其它的并不需要，因此：

有两个命令可以查看当前可以安装的docker-ce版本和docker-engine版本:

apt-cache policy docker-engine

apt-cache madison docker-ce

~~~~~~~~~~~~~~~~~~~~~~~~~

2: 然后在master节点上：

kubeadm init

第一次执行等待时间比较长，卡在（Created API client, waiting for the control plane to become ready）

解决办法：kubeadm reset -> kubeadm init

当出现：

renjingui@renjg-HP-Compaq-Pro-6380-MT:~$ sudo kubeadm init

[kubeadm] WARNING: kubeadm is in beta, please do not use it for production clusters.

[init] Using Kubernetes version: v1.6.2

[init] Using Authorization mode: RBAC

[preflight] Running pre-flight checks

[preflight] Starting the kubelet service

[certificates] Generated CA certificate and key.

[certificates] Generated API server certificate and key.

[certificates] API Server serving cert is signed for DNS names [renjg-HP-Compaq-Pro-6380-MT kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.96.0.1 109.123.123.6]

[certificates] Generated API server kubelet client certificate and key.

[certificates] Generated service account token signing key and public key.

[certificates] Generated front-proxy CA certificate and key.

[certificates] Generated front-proxy client certificate and key.

[certificates] Valid certificates and keys now exist in "/etc/kubernetes/pki"

[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/controller-manager.conf"

[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/scheduler.conf"

[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/admin.conf"

[kubeconfig] Wrote KubeConfig file to disk: "/etc/kubernetes/kubelet.conf"

[apiclient] Created API client, waiting for the control plane to become ready

[apiclient] All control plane components are healthy after 16.520114 seconds

[apiclient] Waiting for at least one node to register

[apiclient] First node has registered after 4.010585 seconds

[token] Using token: d9961d.36bce67db0c5bd3b

[apiconfig] Created RBAC rules

[addons] Created essential addon: kube-proxy

[addons] Created essential addon: kube-dns

Your Kubernetes master has initialized successfully!

To start using your cluster, you need to run (as a regular user):

sudo cp /etc/kubernetes/admin.conf $HOME/

sudo chown $(id -u):$(id -g) $HOME/admin.conf

export KUBECONFIG=$HOME/admin.conf

You should now deploy a pod network to the cluster.

Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:

http://kubernetes.io/docs/admin/addons/

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

as root:

kubeadm join --token d9961d.36bce67db0c5bd3b 109.123.123.6:6443

就说明init成功了。

通过： kubectl taint nodes --all node-role.kubernetes.io/master- 可以将一个master节点映射为一个node节点

通过 kubectl get nodes 可以查看当前节点情况。

3: 配置网络环境。

由于机器的硬件环境不同，所以要采用通用的网络组件，Flannel 和 Weave Net，前面一种没有成功，原因：dns docker container启动不了

后面一种配置方法：

kubectl apply -f https://git.io/weave-kube-1.6

可以查看所有的namespace的信息：

renjingui@renjg-HP-Compaq-Pro-6380-MT:~$ kubectl get pods --all-namespaces

NAMESPACE NAME READY STATUS RESTARTS AGE

kube-system etcd-renjg-hp-compaq-pro-6380-mt 1/1 Running 0 6m

kube-system kube-apiserver-renjg-hp-compaq-pro-6380-mt 1/1 Running 0 6m

kube-system kube-controller-manager-renjg-hp-compaq-pro-6380-mt 1/1 Running 0 6m

kube-system kube-dns-3913472980-1j8dx 3/3 Running 0 7m

kube-system kube-proxy-4j745 1/1 Running 0 7m

kube-system kube-scheduler-renjg-hp-compaq-pro-6380-mt 1/1 Running 0 6m

kube-system weave-net-r4b8d 2/2 Running 0 5m

renjingui@renjg-HP-Compaq-Pro-6380-MT:~$

4：部署应用/调试信息

kubectl describe -n kube-system po kube-flannel-ds-rr7xv

(NAMESPACE) (NAME)

5：删除一个节点：

Master:

kubectl drain maoxj-optiplex-7010 --delete-local-data --force --ignore-daemonsets

kubectl delete node <node name>

node:

kubeadm reset

6：加入Cluster的方式为：

在node节点上执行：

kubeadm join --token a93f59.e500af089136cc83 109.123.123.6:6443

7:添加dashboard：

在master节点上执行

参看链接：

https://github.com/kubernetes/dashboard#kubernetes-dashboard

apache 转发代理配置：

<VirtualHost *:8081>

ProxyRequests On

ProxyPass / http://127.0.0.1:8001/

</VirtualHost>