在Kubernetes集群中使用calico做网络驱动的配置方法

参考calico官网：http://docs.projectcalico.org/v2.0/getting-started/kubernetes/installation/hosted/kubeadm/

上述链接介绍的是利用calico内置独立的etcd节点实现pod发现与存储的机制，过程中通过yaml文件描述的规则在Kubernetes master所在node上部署一个单节点的etcd集群，此etcd集群只供calico内部使用

贴一下我的配置：

# This ConfigMap is used to configure a self-hosted Calico installation.
kind: ConfigMap
apiVersion: v1
metadata:
  name: calico-config
  namespace: kube-system
data:
  # The location of your etcd cluster.  This uses the Service clusterIP
  # defined below.
  # 192.168.182.128是我虚拟机的地址 也就是Kubernetes master节点所在机器的地址，下面配置中用到的这个地址同理
  etcd_endpoints: "http://192.168.182.128:6666"

  # True enables BGP networking, false tells Calico to enforce
  # policy only, using native networking.
  enable_bgp: "true"

  # The CNI network configuration to install on each node.
  cni_network_config: |-
    {
        "name": "k8s-pod-network",
        "type": "calico",
        "etcd_endpoints": "http://192.168.182.128:6666",
        "log_level": "info",
        "ipam": {
            "type": "calico-ipam"
        },
        "policy": {
            "type": "k8s",
             "k8s_api_root": "https://192.168.182.128:6443",
             "k8s_auth_token": ""
        },
        "kubernetes": {
            "kubeconfig": "/etc/kubernetes/kubelet.conf"
        }
    }

  # The default IP Pool to be created for the cluster.
  # Pod IP addresses will be assigned from this pool.
  ippool.yaml: |
      apiVersion: v1
      kind: ipPool
      metadata:
        cidr: 10.1.0.0/16
      spec:
        ipip:
          enabled: true
        nat-outgoing: true

---

# This manifest installs the Calico etcd on the kubeadm master.  This uses a DaemonSet
# to force it to run on the master even when the master isn't schedulable, and uses
# nodeSelector to ensure it only runs on the master.
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: calico-etcd
  namespace: kube-system
  labels:
    k8s-app: calico-etcd
spec:
  template:
    metadata:
      labels:
        k8s-app: calico-etcd
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
        scheduler.alpha.kubernetes.io/tolerations: |
          [{"key": "dedicated", "value": "master", "effect": "NoSchedule" },
           {"key":"CriticalAddonsOnly", "operator":"Exists"}]
    spec:
      # Only run this pod on the master.
      nodeSelector:
        kubeadm.alpha.kubernetes.io/role: master
      hostNetwork: true
      containers:
        - name: calico-etcd
          image: k8s/etcd:v3.0.15
          env:
            - name: CALICO_ETCD_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
          command: ["/bin/sh","-c"]
          args: ["/usr/local/bin/etcd --name=calico --data-dir=/var/etcd/calico-data --advertise-client-urls=http://$CALICO_ETCD_IP:6666 --listen-client-urls=http://0.0.0.0:6666 --listen-peer-urls=http://0.0.0.0:6667"]
          volumeMounts:
            - name: var-etcd
              mountPath: /var/etcd
      volumes:
        - name: var-etcd
          hostPath:
            path: /var/etcd

---

# This manfiest installs the Service which gets traffic to the Calico
# etcd.
apiVersion: v1
kind: Service
metadata:
  labels:
    k8s-app: calico-etcd
  name: calico-etcd
  namespace: kube-system
spec:
  # Select the calico-etcd pod running on the master.
  selector:
    k8s-app: calico-etcd
  # This ClusterIP needs to be known in advance, since we cannot rely
  # on DNS to get access to etcd.
  clusterIP: None
  ports:
    - port: 6666

---

# This manifest installs the calico/node container, as well
# as the Calico CNI plugins and network config on
# each master and worker node in a Kubernetes cluster.
kind: DaemonSet
apiVersion: extensions/v1beta1
metadata:
  name: calico-node
  namespace: kube-system
  labels:
    k8s-app: calico-node
spec:
  selector:
    matchLabels:
      k8s-app: calico-node
  template:
    metadata:
      labels:
        k8s-app: calico-node
      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:
        # Runs calico/node container on each Kubernetes node.  This
        # container programs network policy and routes on each
        # host.
        - name: calico-node
          image: calico/node:v1.0.2
          env:
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints
            # Enable BGP.  Disable to enforce policy only.
            - name: CALICO_NETWORKING
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: enable_bgp
            # Disable file logging so `kubectl logs` works.
            - name: CALICO_DISABLE_FILE_LOGGING
              value: "true"
            # Set Felix endpoint to host default action to ACCEPT.
            - name: FELIX_DEFAULTENDPOINTTOHOSTACTION
              value: "ACCEPT"
            # Don't configure a default pool.  This is done by the Job
            # below.
            - name: NO_DEFAULT_POOLS
              value: "true"
            # Auto-detect the BGP IP address.
            - name: IP
              value: ""
          securityContext:
            privileged: true
          volumeMounts:
            - mountPath: /lib/modules
              name: lib-modules
              readOnly: true
            - mountPath: /var/run/calico
              name: var-run-calico
              readOnly: false
        # This container installs the Calico CNI binaries
        # and CNI network config file on each node.
        - name: install-cni
          image: quay.io/calico/cni:v1.5.5
          command: ["/install-cni.sh"]
          env:
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints
            # The CNI network config to install on each node.
            - name: CNI_NETWORK_CONFIG
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: cni_network_config
          volumeMounts:
            - mountPath: /host/opt/cni/bin
              name: cni-bin-dir
            - mountPath: /host/etc/cni/net.d
              name: cni-net-dir
      volumes:
        # Used by calico/node.
        - name: lib-modules
          hostPath:
            path: /lib/modules
        - name: var-run-calico
          hostPath:
            path: /var/run/calico
        # Used to install CNI.
        - name: cni-bin-dir
          hostPath:
            path: /opt/cni/bin
        - name: cni-net-dir
          hostPath:
            path: /etc/cni/net.d

---

# This manifest deploys the Calico policy controller on Kubernetes.
# See https://github.com/projectcalico/k8s-policy
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: calico-policy-controller
  namespace: kube-system
  labels:
    k8s-app: calico-policy
spec:
  # The policy controller can only have a single active instance.
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      name: calico-policy-controller
      namespace: kube-system
      labels:
        k8s-app: calico-policy-controller
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
        scheduler.alpha.kubernetes.io/tolerations: |
          [{"key": "dedicated", "value": "master", "effect": "NoSchedule" },
           {"key":"CriticalAddonsOnly", "operator":"Exists"}]
    spec:
      # The policy controller must run in the host network namespace so that
      # it isn't governed by policy that would prevent it from working.
      hostNetwork: true
      containers:
        - name: calico-policy-controller
          image: calico/kube-policy-controller:v0.5.2
          env:
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints
            # The location of the Kubernetes API.  Use the default Kubernetes
            # service for API access.
            - name: K8S_API
              value: "https://kubernetes.default:443"
            # Since we're running in the host namespace and might not have KubeDNS
            # access, configure the container's /etc/hosts to resolve
            # kubernetes.default to the correct service clusterIP.
            - name: CONFIGURE_ETC_HOSTS
              value: "true"

---

## This manifest deploys a Job which performs one time
# configuration of Calico
apiVersion: batch/v1
kind: Job
metadata:
  name: configure-calico
  namespace: kube-system
  labels:
    k8s-app: calico
spec:
  template:
    metadata:
      name: configure-calico
      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
      restartPolicy: OnFailure
      containers:
        # Writes basic configuration to datastore.
        - name: configure-calico
          image: calico/ctl:v1.0.2
          args:
          - apply
          - -f
          - /etc/config/calico/ippool.yaml
          volumeMounts:
            - name: config-volume
              mountPath: /etc/config
          env:
            # The location of the etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints
      volumes:
       - name: config-volume
         configMap:
           name: calico-config
           items:
            - key: ippool.yaml
              path: calico/ippool.yaml

通过kubectl命令安装calico

kubectl create -f calico.yaml

可以根据执行结果和kubectl系列命令查看相应的deployment和各个pod的运行状态以及出错信息。

如果一切正常，就可以创建测试pod进行ping通信测试了，官方给出的测试方法也可以：

kubectl create ns policy-demo

# Run the Pods.
kubectl run --namespace=policy-demo nginx --replicas=2 --image=nginx

# Create the Service.
kubectl expose --namespace=policy-demo deployment nginx --port=80

# Run a Pod and try to access the `nginx` Service.
$ kubectl run --namespace=policy-demo access --rm -ti --image busybox /bin/sh
Waiting for pod policy-demo/access-472357175-y0m47 to be running, status is Pending, pod ready: false

If you don't see a command prompt, try pressing enter.

/ # wget -q nginx -O -

如果看到nginx的回复说明网络已经通了， 注意前提是Kubernetes集群中已经运行dns服务

也可以直接在命令行发送ping：

kubectl exec -ti nginx-701339712-f2cdm --namespace=policy-demo ping 10.1.155.75

涉及到的docker镜像文件在国内网络环境下载很慢，如果有需要我可以贴上来。