kubernetes叢集calico網路部署

一.部署環境及架構

• 作業系統:ubuntu14.04

• Kubernetes:1.3.5

• Etcd版本:2.2.1

• Docker版本:1.10.1

• calicoctl版本：v0.23.0

• calico版本：v1.4.3

• calico-ipam版本：v1.4.3

• loopback版本：v0.3.0

• 叢集資訊：

二 、前提

1.使用calico需要kubernetes>=1.1。使用NetworkPolicy功能，kubernetes>=1.3.0

2.kubernetes中所有node可以訪問的一個etcd叢集。（可以共享kubernetes的etcd叢集，建議另外新建一個etcd叢集。）

三 、calico元件

1. calico/nodedocker容器執行在k8s的master和每個node節點上。由於它包含用於calico路由的BGPagent。

2. calico-cni外掛與kubelet元件一起部署在每個node節點上，用於當pod建立後，新增該pod到calico網路。

3.calico/kube-policy-controller

四、安裝步驟

1.每個節點安裝docker（包括master節點）

2.安裝etcd和kubernetes

3.每個節點（包括master）執行calico/node

# Download and install `calicoctl`
wget https://github.com/projectcalico/calico-containers/releases/download/v0.23.0/calicoctl
sudo chmod +x calicoctl

# Run the calico/node container
sudo ETCD_ENDPOINTS=http://10.10.102.66:4001
 
 ./calicoctl node

kubelet需要呼叫calico和calico-ipam外掛

wget -N -P /opt/cni/bin https://github.com/projectcalico/calico-cni/releases/download/v1.4.3/calico
wget -N -P /opt/cni/bin https://github.com/projectcalico/calico-cni/releases/download/v1.4.3/calico-ipam
chmod +x /opt/cni/bin/calico /opt/cni/bin/calico-ipam

CalicoCNI外掛需要標準的CNI配置檔案，如下所示。只有當部署calico/kube-policy-controller時候才需要policy欄位。

mkdir -p /etc/cni/net.d
cat >/etc/cni/net.d/10-calico.conf <<EOF
{
    "name": "calico-k8s-network",
    "type": "calico",
    "etcd_endpoints": "http://10.10.102.66:4001",
    "log_level": "info",
    "ipam": {
        "type": "calico-ipam"
    },
    "policy": {
        "type": "k8s"
    },
    "kubernetes": {
        "kubeconfig": "/root/.kube/config"
    }
}
EOF

5.安裝標準CNI lo外掛

wget https://github.com/containernetworking/cni/releases/download/v0.3.0/cni-v0.3.0.tgz
tar -zxvf cni-v0.3.0.tgz
sudo cp loopback /opt/cin/bin/

6.部署Caliconetwork policy controller

calico/kube-policy-controller實現了k8sNetworkPolicy Api 通過watchk8s API中的podnamespce networkpolicy 事件，配置calico響應相應事件。它被RelicaSet管理。

apiVersion: extensions/v1beta1
kind: ReplicaSet
metadata:
  name: calico-policy-controller
  namespace: kube-system
  labels:
    k8s-app: calico-policy
spec:
  replicas: 1
  template:
    metadata:
      name: calico-policy-controller
      namespace: kube-system
      labels:
        k8s-app: calico-policy
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
        scheduler.alpha.kubernetes.io/tolerations: |
          [{"key": "dedicated", "value": "master", "effect": "NoSchedule" },
           {"key":"CriticalAddonsOnly", "operator":"Exists"}]
    spec:
      hostNetwork: true
      containers:
        - name: calico-policy-controller
          image: calico/kube-policy-controller:v0.4.0
          env:
            - name: ETCD_ENDPOINTS
              value: "http://10.10.102.66:4001"
            - name: K8S_API
              value: "https://kubernetes.default:443"
            - name: CONFIGURE_ETC_HOSTS
              value: "true"

kubectl create -f policy-controller.yaml

7.配置kubelet

kubelet啟動的時候使用如下引數配置使用calico

• --network-plugin=cni
• --network-plugin-dir=/etc/cni/net.d

calicoctl pool add 192.168.0.0/16  --nat-outgoing