k8s+docker+calico
实验环境：enp0s3：192.168.112.149 （master）
enp0s3：192.168.112.42（node1）
enp0s3：192.168.112.249 （node2）
注意：以上操作系统环境都是 Ubuntu Xenial 16.04 (LTS)
一.安装Docker
注意：docker支持64位操作系统，docker 的内核3.10以上版本
1.更新包信息，确保APT使用https方法，并且已安装CA证书
sudo apt-get update
sudo apt-get install apt-transport-https ca-certificates
2.添加新的GPG密钥
sudo apt-key adv --keyserver hkp://ha.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D
3.添加docker源
echo 'deb https://apt.dockerproject.org/repo ubuntu-xenial main' >> /etc/apt/sources.list.d/docker.list
注意：这是Ubuntu Xenial 16.04 (LTS)的安装源，每个版本的源是不一样的具体见官方文档
4.更新源
sudo apt-get update
5.验证APT的存储库是否正确
apt-cache policy docker-engine
注意：出现以上这样的才正确
6.更新源
sudo apt-get update
7.安装镜像
sudo apt-get install linux-image-extra-$(uname -r) linux-image-extra-virtual
8.安装docker
sudo apt-get install docker-engine
9.启动docker守护进程
sudo service docker start
10.拉取hello-world镜像验证docker是否正确
sudo docker run hello-world
二.在每个节点都要操作
1.拉取镜像（注意：不是root用户及时sudo）
docker pull calico/node:v0.23.0
docker pull tristan129/pause-amd64:3.0
docker tag tristan129/pause-amd64:3.0 gcr.io/google_containers/pause-amd64:3.0
将附件里的kubernets_wangjun.tar 放到每个节点的家目录下并解压
cp master/calico-node.service /etc/systemd/
systemctl enable /etc/systemd/calico-node.service
cp master/calicoctl.0.23.0 master/kubectl.1.4.3 master/kubelet.1.4.3 /usr/bin/
ln -snf kubelet.1.4.3 kubelet
ln -snf kubectl.1.4.3 kubectl
ln -snf calicoctl.0.23.0 calicoctl
mkdir -p /etc/kubernetes/manifests
sudo mkdir -p /etc/kubernetes/{manifests,ssl}
编辑 /etc/profile
export MASTER_NODE_IP='填写master ip'
export NODE_IP='填写node ip'
三.TLS认证
.master节点上生成证书
openssl genrsa -out ca-key.pem 2048
openssl req -x509 -new -nodes -key ca-key.pem -days 1000 -out ca.pem -subj "/CN=kube-ca"
openssl genrsa -out apiserver-key.pem 2048
openssl req -new -key apiserver-key.pem -out apiserver.csr -subj "/CN=kube-apiserver" -config openssl.cnf
这里的openssl.conf路径是在提供的tar包里的master路径下
openssl x509 -req -in apiserver.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out apiserver.pem -days 1000 -extensions v3_req -extfile openssl.cnf 这里的openssl.conf路径是在提供的tar包里的master路径下
cp *.pem /etc/kubernetes/ssl/
cp master/kubernetes-master.manifest /etc/kubernetes/manifests/
cp master/ calico-etcd.manifest /etc/kubernetes/ssl
启动服务
systemctl start calico-node
这时候calico并不会起来，因为连接不到etcd的6666端口
检查calcio服务状态
sudo systemctl status calico-node.service
可以看下日志 /var/log/syslog
Nov 22 15:56:08 master calicoctl: ERROR: Could not connect to etcd at 192.168.112.123:6666: Connection to etcd failed due to MaxRetryError("HTTPConnectionPool(host='192.168.112.123', port=6666): Max retries exceeded with url: /version (Caused by NewConnectionError(': Failed to establish a new connection: Connection refused',))",)
Nov 22 15:56:08 master systemd: calico-node.service: Main process exited, code=exited, status=1/FAILURE
Nov 22 15:56:08 master systemd: calico-node.service: Unit entered failed state.
Nov 22 15:56:08 master systemd: calico-node.service: Failed with result 'exit-code'.
Nov 22 15:56:18 master systemd: calico-node.service: Service hold-off time over, scheduling restart.
Nov 22 15:56:18 master systemd: Stopped Calico per-node agent.
Nov 22 15:56:18 master systemd: Started Calico per-node agent.
Nov 22 15:56:18 master calicoctl: ERROR: Could not connect to etcd at 192.168.112.123:6666: Connection to etcd failed due to MaxRetryError("HTTPConnectionPool(host='192.168.112.123', port=6666): Max retries exceeded with url: /version (Caused by NewConnectionError(': Failed to establish a new connection: Connection refused',))",)
Nov 22 15:56:18 master systemd: calico-node.service: Main process exited, code=exited, status=1/FAILURE
Nov 22 15:56:18 master systemd: calico-node.service: Unit entered failed state.
Nov 22 15:56:18 master systemd: calico-node.service: Failed with result 'exit-code'.
cp master/kubeletserver /etc/systemd/
systemctl enable kubelet.service
systemctl start kubelet.service
此时你docker ps 应该看到 apiserver proxy scheduler controlle pause etcd (2个，一个被kubernetes集群使用另外一个备calico集群使用)
在node节点上
cd client_node/
生成私钥和证书请求文件
openssl genrsa -out worker-key.pem 2048
mv worker-key.pem /etc/kubernetes/ssl
chmod 600 /etc/kubernetes/ssl/worker-key.pem
chown root:root /etc/kubernetes/ssl/worker-key.pem
export WORKER_IP=这里填节点IP
openssl req -new -key worker-key.pem -out worker.csr -subj "/CN=worker-key" -config worker-openssl.cnf
需要将worker.csr 发送到maste节点上的进行签名
scp worker.csr ${MASTER_NODE_IP}/../master/
四.在maser节点上签名
export WORKER_IP=这里填节点IP
openssl x509 -req -in worker.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out worker.pem -days 365 -extensions v3_req -extfile worker-openssl.cnf/
scp apiserver-key.pem apiserver.pem ca.pem worker-key.pem worker.pem 拷贝到节点的/etc/kubernetes/ssl/
五.在node节点上
mkdir -p /etc/cni/net.d
mkdir -p /opt/cni/bin
cp client_node/10-calico.conf /etc/cni/net.d 注意替换${MASTER_NODE_IP}
cp client_node/cni_network.tar /opt/cni/bin 并解压
cp client_node/kubelet.service /etc/systemd/
cp client_node/network-environment /etc/ 注意替换${MASTER_NODE_IP} 和${NODE_IP}
export ETCD_AUTHORITY=${MASTER_NODE_IP}:6666 注意替换${MASTER_NODE_IP}
calico pool remove 192.168.0.0/16
calico pool add 172.26.0.0/16
calico pool show
systemctl enable /etc/systemd/kubelet.service
systemctl start systemd/kubelet
这个时候docker ps 应该看到 proxy 进程已经起来了
六 安装额外组件 dashboard及kube-dns在master 上操作
cd addon
kubectl create -f kubernetes-dashboard.yaml
kubectl create -f kubdns-rc.yaml
kubectl create -f kubdns-svc.yaml
完毕
在集群中任意节点上可以访问cluster ip 及 pod ip
calico status 可以看到各节点之间为bgp全互联关系，我们可以关闭全互联，作为三层交换机的RR client . 这样我们的容器可以访问到集群外的应用或者你访问使用snat
calico pool add 2.26.0.0/16 --nat-outgoing
这时候你的容器就可以访问外部应用了。
如果外部需要访问你的服务可以使用node port 或者loadblance的方式，详细内容见V2将更性使用BGP 反射器的结构及master的高可用。
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