K8s pod 容器无法ping通外网, kubesphere devOps 无法使用

kevendeng 这个是我重新搭建的，没有用kk

kevendeng 是的，不知道是部署的原因还是和云服务厂商有关，本地没出现过这个问题

kevendeng 还发现一个问题，不知您有遇到过没。就是 插入MASQUERADE规则到第一行，并且填写的是 IP/Mask 。但查看后发现变成了 HostName 形式，而 ip 形式的没有生效，也没有数据。这是什么问题

kevendeng

kevendeng 这是容器内的IP

kevendeng 对，内网访问没有任何问题。
—————-flannel 配置————————
apiVersion: v1
kind: Pod
metadata:
creationTimestamp: “2021-06-07T07:19:24Z”
generateName: kube-flannel-ds-
labels:
app: flannel
controller-revision-hash: 7fb8b954f9
pod-template-generation: “1”
tier: node
managedFields:

• apiVersion: v1
  fieldsType: FieldsV1
  fieldsV1:
  f:metadata:
  f:generateName: {}
  f:labels:
  .: {}
  f:app: {}
  f:controller-revision-hash: {}
  f:pod-template-generation: {}
  f:tier: {}
  f:ownerReferences:
  .: {}
  k:{“uid”:“eeffaee4-c706-4902-943a-dc674ed5fac9”}:
  .: {}
  f:apiVersion: {}
  f:blockOwnerDeletion: {}
  f:controller: {}
  f:kind: {}
  f:name: {}
  f:uid: {}
  f:spec:
  f:affinity:
  .: {}
  f:nodeAffinity:
  .: {}
  f:requiredDuringSchedulingIgnoredDuringExecution:
  .: {}
  f:nodeSelectorTerms: {}
  f:containers:
  k:{“name”:“kube-flannel”}:
  .: {}
  f:args: {}
  f:command: {}
  f:env:
  .: {}
  k:{“name”:“POD_NAME”}:
  .: {}
  f:name: {}
  f:valueFrom:
  .: {}
  f:fieldRef:
  .: {}
  f:apiVersion: {}
  f:fieldPath: {}
  k:{“name”:“POD_NAMESPACE”}:
  .: {}
  f:name: {}
  f:valueFrom:
  .: {}
  f:fieldRef:
  .: {}
  f:apiVersion: {}
  f:fieldPath: {}
  f:image: {}
  f:imagePullPolicy: {}
  f:name: {}
  f:resources:
  .: {}
  f:limits:
  .: {}
  f:cpu: {}
  f:memory: {}
  f:requests:
  .: {}
  f:cpu: {}
  f:memory: {}
  f:securityContext:
  .: {}
  f:capabilities:
  .: {}
  f:add: {}
  f:privileged: {}
  f:terminationMessagePath: {}
  f:terminationMessagePolicy: {}
  f:volumeMounts:
  .: {}
  k:{“mountPath”:“/etc/kube-flannel/”}:
  .: {}
  f:mountPath: {}
  f:name: {}
  k:{“mountPath”:“/run/flannel”}:
  .: {}
  f:mountPath: {}
  f:name: {}
  f:dnsPolicy: {}
  f:enableServiceLinks: {}
  f:hostNetwork: {}
  f:initContainers:
  .: {}
  k:{“name”:“install-cni”}:
  .: {}
  f:args: {}
  f:command: {}
  f:image: {}
  f:imagePullPolicy: {}
  f:name: {}
  f:resources: {}
  f:terminationMessagePath: {}
  f:terminationMessagePolicy: {}
  f:volumeMounts:
  .: {}
  k:{“mountPath”:“/etc/cni/net.d”}:
  .: {}
  f:mountPath: {}
  f:name: {}
  k:{“mountPath”:“/etc/kube-flannel/”}:
  .: {}
  f:mountPath: {}
  f:name: {}
  f:priorityClassName: {}
  f:restartPolicy: {}
  f:schedulerName: {}
  f:securityContext: {}
  f:serviceAccount: {}
  f:serviceAccountName: {}
  f:terminationGracePeriodSeconds: {}
  f:tolerations: {}
  f:volumes:
  .: {}
  k:{“name”:“cni”}:
  .: {}
  f:hostPath:
  .: {}
  f:path: {}
  f:type: {}
  f:name: {}
  k:{“name”:“flannel-cfg”}:
  .: {}
  f:configMap:
  .: {}
  f:defaultMode: {}
  f:name: {}
  f:name: {}
  k:{“name”:“run”}:
  .: {}
  f:hostPath:
  .: {}
  f:path: {}
  f:type: {}
  f:name: {}
  manager: kube-controller-manager
  operation: Update
  time: “2021-06-07T07:19:24Z”
• apiVersion: v1
  fieldsType: FieldsV1
  fieldsV1:
  f:status:
  f:conditions:
  k:{“type”:“ContainersReady”}:
  .: {}
  f:lastProbeTime: {}
  f:lastTransitionTime: {}
  f:status: {}
  f:type: {}
  k:{“type”:“Initialized”}:
  .: {}
  f:lastProbeTime: {}
  f:lastTransitionTime: {}
  f:status: {}
  f:type: {}
  k:{“type”:“Ready”}:
  .: {}
  f:lastProbeTime: {}
  f:lastTransitionTime: {}
  f:status: {}
  f:type: {}
  f:containerStatuses: {}
  f:hostIP: {}
  f:initContainerStatuses: {}
  f:phase: {}
  f:podIP: {}
  f:podIPs:
  .: {}
  k:{“ip”:“172.27.200.160”}:
  .: {}
  f:ip: {}
  f:startTime: {}
  manager: kubelet
  operation: Update
  time: “2021-06-07T07:22:58Z”
  name: kube-flannel-ds-zckq2
  namespace: kube-system
  ownerReferences:
• apiVersion: apps/v1
  blockOwnerDeletion: true
  controller: true
  kind: DaemonSet
  name: kube-flannel-ds
  uid: eeffaee4-c706-4902-943a-dc674ed5fac9
  resourceVersion: “45705”
  selfLink: /api/v1/namespaces/kube-system/pods/kube-flannel-ds-zckq2
  uid: 107e0185-230e-44ca-b6b7-25a153ed91d0
  spec:
  affinity:
  nodeAffinity:
  requiredDuringSchedulingIgnoredDuringExecution:
  nodeSelectorTerms:
  - matchFields:
  - key: metadata.name
  operator: In
  values:
  - kubernetesdev
  containers:
• args:
  • –ip-masq
  • –kube-subnet-mgr
    command:
  • /opt/bin/flanneld
    env:
  • name: POD_NAME
    valueFrom:
    fieldRef:
    apiVersion: v1
    fieldPath: metadata.name
  • name: POD_NAMESPACE
    valueFrom:
    fieldRef:
    apiVersion: v1
    fieldPath: metadata.namespace
    image: quay.io/coreos/flannel:v0.14.0
    imagePullPolicy: IfNotPresent
    name: kube-flannel
    resources:
    limits:
    cpu: 100m
    memory: 50Mi
    requests:
    cpu: 100m
    memory: 50Mi
    securityContext:
    capabilities:
    add:
    • NET_ADMIN
    • NET_RAW
      privileged: false
      terminationMessagePath: /dev/termination-log
      terminationMessagePolicy: File
      volumeMounts:
  • mountPath: /run/flannel
    name: run
  • mountPath: /etc/kube-flannel/
    name: flannel-cfg
  • mountPath: /var/run/secrets/kubernetes.io/serviceaccount
    name: flannel-token-6nqmq
    readOnly: true
    dnsPolicy: ClusterFirst
    enableServiceLinks: true
    hostNetwork: true
    initContainers:
• args:
  • -f
  • /etc/kube-flannel/cni-conf.json
  • /etc/cni/net.d/10-flannel.conflist
    command:
  • cp
    image: quay.io/coreos/flannel:v0.14.0
    imagePullPolicy: IfNotPresent
    name: install-cni
    resources: {}
    terminationMessagePath: /dev/termination-log
    terminationMessagePolicy: File
    volumeMounts:
  • mountPath: /etc/cni/net.d
    name: cni
  • mountPath: /etc/kube-flannel/
    name: flannel-cfg
  • mountPath: /var/run/secrets/kubernetes.io/serviceaccount
    name: flannel-token-6nqmq
    readOnly: true
    nodeName: kubernetesdev
    preemptionPolicy: PreemptLowerPriority
    priority: 2000001000
    priorityClassName: system-node-critical
    restartPolicy: Always
    schedulerName: default-scheduler
    securityContext: {}
    serviceAccount: flannel
    serviceAccountName: flannel
    terminationGracePeriodSeconds: 30
    tolerations:
• effect: NoSchedule
  operator: Exists
• effect: NoExecute
  key: node.kubernetes.io/not-ready
  operator: Exists
• effect: NoExecute
  key: node.kubernetes.io/unreachable
  operator: Exists
• effect: NoSchedule
  key: node.kubernetes.io/disk-pressure
  operator: Exists
• effect: NoSchedule
  key: node.kubernetes.io/memory-pressure
  operator: Exists
• effect: NoSchedule
  key: node.kubernetes.io/pid-pressure
  operator: Exists
• effect: NoSchedule
  key: node.kubernetes.io/unschedulable
  operator: Exists
• effect: NoSchedule
  key: node.kubernetes.io/network-unavailable
  operator: Exists
  volumes:
• hostPath:
  path: /run/flannel
  type: ""
  name: run
• hostPath:
  path: /etc/cni/net.d
  type: ""
  name: cni
• configMap:
  defaultMode: 420
  name: kube-flannel-cfg
  name: flannel-cfg
• name: flannel-token-6nqmq
  secret:
  defaultMode: 420
  secretName: flannel-token-6nqmq
  status:
  conditions:
• lastProbeTime: null
  lastTransitionTime: “2021-06-07T07:19:25Z”
  status: “True”
  type: Initialized
• lastProbeTime: null
  lastTransitionTime: “2021-06-07T07:22:49Z”
  status: “True”
  type: Ready
• lastProbeTime: null
  lastTransitionTime: “2021-06-07T07:22:49Z”
  status: “True”
  type: ContainersReady
• lastProbeTime: null
  lastTransitionTime: “2021-06-07T07:19:24Z”
  status: “True”
  type: PodScheduled
  containerStatuses:
• containerID: docker://37ae778489c6ee9202dbb9e0cc376afe12555f5bb6102052c332872532a3bb43
  image: quay.io/coreos/flannel:v0.14.0
  imageID: docker-pullable://quay.io/coreos/flannel@sha256:4a330b2f2e74046e493b2edc30d61fdebbdddaaedcb32d62736f25be8d3c64d5
  lastState:
  terminated:
  containerID: docker://0adbc7924866769ed23b88816c7f5cf02d397154a0eb44c5ed767427edf16b94
  exitCode: 0
  finishedAt: “2021-06-07T07:19:30Z”
  reason: Completed
  startedAt: “2021-06-07T07:19:25Z”
  name: kube-flannel
  ready: true
  restartCount: 1
  started: true
  state:
  running:
  startedAt: “2021-06-07T07:22:47Z”
  hostIP: 172.27.200.160
  initContainerStatuses:
• containerID: docker://7d1e1d33afcf0eed98928c71c89e5381c7af2fbd28b413ebaf0a405d641df44d
  image: quay.io/coreos/flannel:v0.14.0
  imageID: docker-pullable://quay.io/coreos/flannel@sha256:4a330b2f2e74046e493b2edc30d61fdebbdddaaedcb32d62736f25be8d3c64d5
  lastState: {}
  name: install-cni
  ready: true
  restartCount: 1
  state:
  terminated:
  containerID: docker://7d1e1d33afcf0eed98928c71c89e5381c7af2fbd28b413ebaf0a405d641df44d
  exitCode: 0
  finishedAt: “2021-06-07T07:22:46Z”
  reason: Completed
  startedAt: “2021-06-07T07:22:46Z”
  phase: Running
  podIP: 172.27.200.160
  podIPs:
• ip: 172.27.200.160
  qosClass: Burstable
  startTime: “2021-06-07T07:19:24Z”

kevendeng 就是做SNAT 源地址转换。我本地虚拟机从没有设置过是正常，但测试了两台云服务都需设置

kevendeng 另一台云服务之前是能访问控制面板，但容器内无法访问外网，加上这个规则就好了。
这个是进出都不行，加了规则也没用

kevendeng 加上去掉都不行，宿主机可以ping通，外网还是不行

kevendeng 通过在容器上，宿主机上，远端主机抓包发现。容器的数据包能到达宿主机，能到达远端主机，远端主机的数据包能回到宿主机，但宿主机上的数据包无法回到容器

ShadowOvO

容器发往公网

宿主机有回包

但容器无法收到回包