kubelet报listen tcp [::1]:0: bind问题解决

本文分享自天翼云开发者社区《kubelet报listen tcp [::1]:0: bind问题解决》，作者：SummerSnow

目录

1.环境目录
2.问题现象
3.问题定位
4.问题解决

环境介绍

# k8s集群环境如下：
[root@k8s-master][~]
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.0", GitCommit:"xxx", GitTreeState:"clean", BuildDate:"xxx", GoVersion:"go1.17.3", Compiler:"gc", Platform:"linux/amd64"}

[root@k8s-master][~]
$kubectl get node
NAME         STATUS   ROLES                  AGE    VERSION
k8s-master   Ready    control-plane,master   559d   v1.23.0
k8s-node1    Ready    <none>                 559d   v1.23.0
k8s-node2    Ready    <none>                 559d   v1.23.0

# 系统环境信息
[root@k8s-master][~]
$cat /etc/redhat-release
CentOS Linux release 7.7.1908 (Core)

问题现象

#1 在master节点查看node节点信息的时候报NotReady
[root@k8s-master][~]
$kubectl get node
NAME         STATUS     ROLES                  AGE    VERSION
k8s-master   Ready      control-plane,master   559d   v1.23.0
k8s-node1    Ready      <none>                 559d   v1.23.0
k8s-node2   NotReady    <none>                 559d   v1.23.0

#2 登录k8s-node2，查看kubelet状态，处于restarting状态
[root@k8s-node2][~]
$systemctl status kubelet

#3 查看日志，出现报错
[root@k8s-node2][~]
$journalctl -fu kubelet
.........
Streaming server stopped unexpectedly" err="listen tcp [::1]:0: bind: cannot assign requested address
.........

问题定位

#1 初步判定
通过报错信息 [::1]:0: bind 可以判断回环地址有问题

#2 查看hosts配置信息,发现没配置本地解析信息
[root@k8s-node2][~]
$cat /etc/hosts

xx.xx.xx.xx k8s-master
xx.xx.xx.xx k8s-node1
xx.xx.xx.xx k8s-node2

问题解决

#问题原因已找到，接下来就是解决问题
#1 在hosts添加以下信息
[root@k8s-node2][~]
$vim /etc/hosts
127.0.0.1  localhost localhost.localdomain localhost4 localhost4.localdomain4
::1     localhost localhost.localdomain localhost6 localhost6.localdomain6

#2 重启kubelet
[root@k8s-node2][~]
$systemctl restart kubelet

#3 查看kubelet状态，已经处于running
[root@k8s-node2][~]
$systemctl status kubelet

#4 登录master节点查看node信息，已经变成ready了
[root@k8s-master][~]
$kubectl get node
NAME         STATUS   ROLES                  AGE    VERSION
k8s-master   Ready    control-plane,master   559d   v1.23.0
k8s-node1    Ready    <none>                 559d   v1.23.0
k8s-node2    Ready    <none>                 559d   v1.23.0

#5 查看是否还有异常pod，通过命令查看已经无异常pod了
[root@k8s-master][~]
$kubectl get pod -A |grep -v Running