kubernetes 1.8 高可用安装（五）

5安装网络组件calico

安装前需要确认kubelet配置是否已经增加--network-plugin=cni
如果没有配置就加到kubelet配置文件里

Environment="KUBELET_NETWORK_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin

5.1先装rbac

官方URL
https://docs.projectcalico.org/v2.6/getting-started/kubernetes/installation/rbac.yaml

calico-rbac.yaml

# Calico Version v2.6.1
# https://docs.projectcalico.org/v2.6/releases#v2.6.1

---

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: calico-kube-controllers
  namespace: kube-system
rules:
  - apiGroups:
    - ""
    - extensions
    resources:
      - pods
      - namespaces
      - networkpolicies
    verbs:
      - watch
      - list
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: calico-kube-controllers
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: calico-kube-controllers
subjects:
- kind: ServiceAccount
  name: calico-kube-controllers
  namespace: kube-system

---

kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: calico-node
  namespace: kube-system
rules:
  - apiGroups: [""]
    resources:
      - pods
      - nodes
    verbs:
      - get

---

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: calico-node
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: calico-node
subjects:
- kind: ServiceAccount
  name: calico-node
  namespace: kube-system

5.2 创建calico.yaml

官方URL
https://docs.projectcalico.org/v2.6/getting-started/kubernetes/installation/hosted/calico.yaml

配置修改请看下面的参数说明

# Calico Version v2.6.1
# https://docs.projectcalico.org/v2.6/releases#v2.6.1
# This manifest includes the following component versions:
#   calico/node:v2.6.1
#   calico/cni:v1.11.0
#   calico/kube-controllers:v1.0.0

# This ConfigMap is used to configure a self-hosted Calico installation.
kind: ConfigMap
apiVersion: v1
metadata:
  name: calico-config
  namespace: kube-system
data:
  # Configure this with the location of your etcd cluster.
  etcd_endpoints: " :2379"

  # Configure the Calico backend to use.
  calico_backend: "bird"

  # The CNI network configuration to install on each node.
  cni_network_config: |-
    {
        "name": "k8s-pod-network",
        "cniVersion": "0.1.0",
        "type": "calico",
        "etcd_endpoints": "__ETCD_ENDPOINTS__",
        "etcd_key_file": "__ETCD_KEY_FILE__",
        "etcd_cert_file": "__ETCD_CERT_FILE__",
        "etcd_ca_cert_file": "__ETCD_CA_CERT_FILE__",
        "log_level": "info",
        "mtu": 1500,
        "ipam": {
            "type": "calico-ipam"
        },
        "policy": {
            "type": "k8s",
            "k8s_api_root": "https://__KUBERNETES_SERVICE_HOST__:__KUBERNETES_SERVICE_PORT__",
            "k8s_auth_token": "__SERVICEACCOUNT_TOKEN__"
        },
        "kubernetes": {
            "kubeconfig": "__KUBECONFIG_FILEPATH__"
        }
    }

  # If you're using TLS enabled etcd uncomment the following.
  # You must also populate the Secret below with these files.
  etcd_ca: ""   # "/calico-secrets/etcd-ca"
  etcd_cert: "" # "/calico-secrets/etcd-cert"
  etcd_key: ""  # "/calico-secrets/etcd-key"

---

# The following contains k8s Secrets for use with a TLS enabled etcd cluster.
# For information on populating Secrets, see http://kubernetes.io/docs/user-guide/secrets/
apiVersion: v1
kind: Secret
type: Opaque
metadata:
  name: calico-etcd-secrets
  namespace: kube-system
data:
  # Populate the following files with etcd TLS configuration if desired, but leave blank if
  # not using TLS for etcd.
  # This self-hosted install expects three files with the following names.  The values
  # should be base64 encoded strings of the entire contents of each file.
  # etcd-key: null
  # etcd-cert: null
  # etcd-ca: null

---

# 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
      serviceAccountName: calico-node
      containers:
        # Runs calico/node container on each Kubernetes node.  This
        # container programs network policy and routes on each
        # host.
        - name: calico-node
          image: quay.io/calico/node:v2.6.1
          env:
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints
            # Choose the backend to use.
            - name: CALICO_NETWORKING_BACKEND
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: calico_backend
            # Cluster type to identify the deployment type
            - name: CLUSTER_TYPE
              value: "k8s,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"
            # Configure the IP Pool from which Pod IPs will be chosen.
            - name: CALICO_IPV4POOL_CIDR
              value: "192.168.0.0/16"
            - name: CALICO_IPV4POOL_IPIP
              value: "always"
            # Disable IPv6 on Kubernetes.
            - name: FELIX_IPV6SUPPORT
              value: "false"
            # Set Felix logging to "info"
            - name: FELIX_LOGSEVERITYSCREEN
              value: "info"
            # Set MTU for tunnel device used if ipip is enabled
            - name: FELIX_IPINIPMTU
              value: "1440"
            # Auto-detect the BGP IP address.
            - name: IP
              value: "autodetect"
            - name: IP_AUTODETECTION_METHOD
              value: "can-reach=www.baidu.com"
            - name: FELIX_HEALTHENABLED
              value: "true"
          securityContext:
            privileged: true
          resources:
            requests:
              cpu: 250m
          livenessProbe:
            httpGet:
              path: /liveness
              port: 9099
            periodSeconds: 10
            initialDelaySeconds: 10
            failureThreshold: 6
          readinessProbe:
            httpGet:
              path: /readiness
              port: 9099
            periodSeconds: 10
          volumeMounts:
            - mountPath: /lib/modules
              name: lib-modules
              readOnly: true
            - mountPath: /var/run/calico
              name: var-run-calico
              readOnly: false
            - mountPath: /calico-secrets
              name: etcd-certs
        # This container installs the Calico CNI binaries
        # and CNI network config file on each node.
        - name: install-cni
          image: quay.io/calico/cni:v1.11.0
          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
            - mountPath: /calico-secrets
              name: etcd-certs
      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
        # Mount in the etcd TLS secrets.
        - name: etcd-certs
          secret:
            secretName: calico-etcd-secrets

---

# This manifest deploys the Calico Kubernetes controllers.
# See https://github.com/projectcalico/kube-controllers
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: calico-kube-controllers
  namespace: kube-system
  labels:
    k8s-app: calico-kube-controllers
  annotations:
    scheduler.alpha.kubernetes.io/critical-pod: ''
    scheduler.alpha.kubernetes.io/tolerations: |
      [{"key": "dedicated", "value": "master", "effect": "NoSchedule" },
       {"key":"CriticalAddonsOnly", "operator":"Exists"}]
spec:
  # The controllers can only have a single active instance.
  replicas: 1
  strategy:
    type: Recreate
  template:
    metadata:
      name: calico-kube-controllers
      namespace: kube-system
      labels:
        k8s-app: calico-kube-controllers
    spec:
      # The controllers must run in the host network namespace so that
      # it isn't governed by policy that would prevent it from working.
      hostNetwork: true
      serviceAccountName: calico-kube-controllers
      containers:
        - name: calico-kube-controllers
          image: quay.io/calico/kube-controllers:v1.0.0
          env:
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints

---

# This deployment turns off the old "policy-controller". It should remain at 0 replicas, and then
# be removed entirely once the new kube-controllers deployment has been deployed above.
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: calico-policy-controller
  namespace: kube-system
  labels:
    k8s-app: calico-policy
spec:
  # Turn this deployment off in favor of the kube-controllers deployment above.
  replicas: 0
  strategy:
    type: Recreate
  template:
    metadata:
      name: calico-policy-controller
      namespace: kube-system
      labels:
        k8s-app: calico-policy
    spec:
      hostNetwork: true
      serviceAccountName: calico-kube-controllers
      containers:
        - name: calico-policy-controller
          image: quay.io/calico/kube-controllers:v1.0.0
          env:
            # The location of the Calico etcd cluster.
            - name: ETCD_ENDPOINTS
              valueFrom:
                configMapKeyRef:
                  name: calico-config
                  key: etcd_endpoints

---

apiVersion: v1
kind: ServiceAccount
metadata:
  name: calico-kube-controllers
  namespace: kube-system

---

apiVersion: v1
kind: ServiceAccount
metadata:
  name: calico-node
  namespace: kube-system

参数说明：

• etcd_endpoints
  改为你自己的etcd集群

• CALICO_IPV4POOL_CIDR
  calico的IP池，不要和集群的cidr，以及机器的其他IP段冲突，比如用：10.10.0.0/16

• IP Autodetection methods
  机器多网卡的时候，安装calico-node会报错，因为calico默认IP的获取方式是first-found，这个ip可能不是你需要的那个。导致网络不成功，导致注册失败

#calico报错日志
Skipping datastore connection test
IPv4 address 10.96.0.1 discovered on interface kube-ipvs0
No AS number configured on node resource, using global value

需要修改calico.yaml,修改IP的获取方式为autodetect,注意顺序,修改如下

- name: IP
  value: "autodetect"
- name: IP_AUTODETECTION_METHOD
  value: "can-reach=www.baidu.com"

IP_AUTODETECTION_METHOD 参数说明
官方文档URL:https://docs.projectcalico.org/v2.6/reference/node/configuration

• 使用通过ip访问的interface
  can-reach=61.135.169.121

• 使用通过域名访问的interface
  can-reach=www.baidu.com

• 使用指定的interface
  interface=ethx

此时node都应该处于Ready状态

[root@kvm-master network]# kubectl get nodes
NAME         STATUS    ROLES     AGE       VERSION
node2        Ready     <none>    23h       v1.8.0
node1        Ready     <none>    1d        v1.8.0

5.3 安装calicoctl管理calico网络

calicoctl.yaml

# Calico Version v2.6.1
# https://docs.projectcalico.org/v2.6/releases#v2.6.1
# This manifest includes the following component versions:
#   calico/ctl:v1.6.1

apiVersion: v1
kind: Pod
metadata:
  name: calicoctl
  namespace: kube-system
spec:
  hostNetwork: true
  containers:
  - name: calicoctl
    image: quay.io/calico/ctl:v1.6.1
    command: ["/bin/sh", "-c", "while true; do sleep 3600; done"]
    env:
    - name: ETCD_ENDPOINTS
      valueFrom:
        configMapKeyRef:
          name: calico-config
          key: etcd_endpoints

注意：calicoctl以pod形式运行时，无法使用calicoctl node 命令

本文转自银狐博客51CTO博客，原文链接http://blog.51cto.com/foxhound/1978467如需转载请自行联系原作者

战狐