k8s节点变为NotReady状态

╰+哭是因爲堅強的太久メ 2023-07-12 14:11 49阅读 0赞

记录一个小教训。切记： k8s安装完成后不要轻易修改hostname。

# 问题： #

k8s的master节点变为notReady，另外一个worker节点正常。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3J1c3NsZQ_size_16_color_FFFFFF_t_70]

症状：master上的flannel pod显示为pending状态，但是describe pod没有有用信息，最后运行**journalctl -f -u kubelet.service** 日志中，发现节点名称的问题， 想起来刚才修改过主机名，然后问题就清楚了。  
journalctl -f -u kubelet.service显示的日志信息

Mar 09 05:04:49 localhost.localdomain kubelet[5724]: E0309 05:04:49.636853    5724 kubelet.go:2248] node "localhost.localdomain" not found
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: E0309 05:04:49.693945    5724 reflector.go:125] k8s.io/kubernetes/pkg/kubelet/config/apiserve
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: E0309 05:04:49.696794    5724 reflector.go:125] k8s.io/kubernetes/pkg/kubelet/kubelet.go:453:
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: E0309 05:04:49.699268    5724 reflector.go:125] k8s.io/kubernetes/pkg/kubelet/kubelet.go:444:
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: I0309 05:04:49.732622    5724 kubelet_node_status.go:286] Setting node annotation to enable v
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: E0309 05:04:49.736983    5724 kubelet.go:2248] node "localhost.localdomain" not found
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: I0309 05:04:49.782223    5724 kubelet_node_status.go:72] Attempting to register node localhos
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: E0309 05:04:49.782581    5724 kubelet_node_status.go:94] Unable to register node "localhost.l
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: I0309 05:04:49.806613    5724 kubelet.go:1822] skipping pod synchronization - container runti
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: I0309 05:04:49.807165    5724 plugin_manager.go:116] Starting Kubelet Plugin Manager
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: E0309 05:04:49.807373    5724 eviction_manager.go:247] eviction manager: failed to get summar
    Mar 09 05:04:49 localhost.localdomain kubelet[5724]: E0309 05:04:49.844272    5724 kubelet.go:2248] node "localhost.localdomain" not found

关键的一句就是node “localhost.localdomain” not found

# 解决办法： #

最后将master机器的主机名修改为原先的名称， 重启master机器，

hostnamectl set-hostname localhost.localdomain

重启master机器后，一切正常了

[root@localhostxxxxx]# kubectl get node
    NAME                    STATUS   ROLES    AGE     VERSION
    localhost.localdomain   Ready    master   7d21h   v1.15.0
    node2                   Ready    <none>   7d20h   v1.15.0

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