排错

ImagePullBackOff

查看pod状态，发现 ImagePullBackOff ，需要查看详细日志，最终看到是网络问题。

  1. [root@node1 ~]# kubectl get pods --namespace=kube-system
  2. NAME                                       READY   STATUS                  RESTARTS   AGE
  3. calico-kube-controllers-57546b46d6-2mwhm   1/1     Running                 0          10m
  4. calico-node-cpdpb                          0/1     Init:ImagePullBackOff   0          10m
  5. calico-node-ftp2r                          1/1     Running                 0          10m
  6. calico-node-wmnp6                          0/1     Init:ImagePullBackOff   0          10m
  1. [root@node1 ~]# kubectl describe pod calico-node-wmnp6 --namespace=kube-system | tail
  2.   ----     ------     ----                  ----               -------
  3.   Normal   Scheduled  <unknown>             default-scheduler  Successfully assigned kube-system/calico-node-wmnp6 to node4
  4.   Warning  Failed     13m                   kubelet, node4     Failed to pull image "calico/cni:v3.10.4": rpc error: code = Unknown desc = Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io on [::1]:53: read udp [::1]:18807->[::1]:53: read: connection refused
  5.   Warning  Failed     12m                   kubelet, node4     Failed to pull image "calico/cni:v3.10.4": rpc error: code = Unknown desc = Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io on [::1]:53: read udp [::1]:54163->[::1]:53: read: connection refused
  6.   Warning  Failed     12m                   kubelet, node4     Failed to pull image "calico/cni:v3.10.4": rpc error: code = Unknown desc = Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io on [::1]:53: read udp [::1]:63309->[::1]:53: read: connection refused
  7.   Warning  Failed     11m (x4 over 13m)     kubelet, node4     Error: ErrImagePull
  8.   Normal   Pulling    11m (x4 over 13m)     kubelet, node4     Pulling image "calico/cni:v3.10.4"
  9.   Warning  Failed     11m                   kubelet, node4     Failed to pull image "calico/cni:v3.10.4": rpc error: code = Unknown desc = Error response from daemon: Get https://registry-1.docker.io/v2/: dial tcp: lookup registry-1.docker.io on [::1]:53: read udp [::1]:48808->[::1]:53: read: connection refused
  10.   Normal   BackOff    7m56s (x22 over 13m)  kubelet, node4     Back-off pulling image "calico/cni:v3.10.4"
  11.   Warning  Failed     2m59s (x44 over 13m)  kubelet, node4     Error: ImagePullBackOff
  12. (reverse-i-search)`del': cat buckfile^Cl.log-0710171825

ImagePullBackOff 状态

错误处理

calico lookup localhost on 114.114.114.114:53: no such host , 一直处于这个状态，/etc/hosts文件中缺少下面两行。加上后，

  1. 127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
  2. ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

  1. [root@ty03 ~]# kubeadm join 172.31.0.50:6443 --token qkagxf.ntcj2g95ibk5y8lm \
  2. > .--discovery-token-ca-cert-hash sha256:5f8e23648085795e2363acefe4a91632378dfc4ae6a0a4ed355559da6d9ccb67
  3. accepts at most 1 arg(s), received 3
  4. To see the stack trace of this error execute with --v=5 or higher