k8s --＞ 19 k8s集群down机

Posted 2022-10-15 FikL-09-19

文章目录

• • • 一、master节点
    • • 1、在masster节点操作
    • 二、故障排查
    • • 1、查看6443（api-server）
      • 2、检查docker和kubelet服务
      • 3、查看日志
      • 4、登录master机器
      • 5、故障处理

一、master节点

1、在masster节点操作

kubectl get node 

`  kubectl get 报错：Unable to connect to the server: dial tcp 10.20.2.224:6443: connect: no route to host

二、故障排查

1、查看6443（api-server）

[mss@z0rzpsap9003 ~]$ netstat -lntp |grep 6443
(No info could be read for "-p": geteuid()=1001 but you should be root.)
tcp6       0      0 :::6443                 :::*                    LISTEN      -     

2、检查docker和kubelet服务

[root@z0rzpsap9003 ~]# systemctl status docker
● docker.service - Docker Application Container Engine
   Loaded: loaded (/usr/lib/systemd/system/docker.service; enabled; vendor preset: disabled)
   Active: active (running) since 二 2022-08-09 17:14:45 CST; 2 months 3 days ago
     Docs: https://docs.docker.com
 Main PID: 1213 (dockerd)
    Tasks: 43
   Memory: 1.6G
   CGroup: /system.slice/docker.service
Hint: Some lines were ellipsized, use -l to show in full.
[root@z0rzpsap9003 ~]# systemctl status kubelet
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/usr/lib/systemd/system/kubelet.service; enabled; vendor preset: disabled)
  Drop-In: /usr/lib/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since 三 2022-10-12 16:20:50 CST; 4h 12min ago
     Docs: https://kubernetes.io/docs/
 Main PID: 211732 (kubelet)
    Tasks: 42
   Memory: 83.5M

3、查看日志

[root@z0rzpsap9003 log]# tail -f /var/log/messages
Oct  9 03:20:01 z0rzpsap9003 kubelet: E1009 03:20:01.852901  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:01 z0rzpsap9003 kubelet: E1009 03:20:01.953018  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.053132  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.153240  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.253357  137657 kubelet.go:2263] node "10.142.218.23" not found
`   Oct  9 03:20:02 z0rzpsap9003 Keepalived_vrrp[1294]: /etc/keepalived/keepalived_checkkubeapiserver.sh exited due to signal 15` 
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.353485  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.453609  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.553696  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.653820  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.753930  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.854088  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:02 z0rzpsap9003 kubelet: E1009 03:20:02.954273  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.054377  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.154482  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.254588  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.354694  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.454810  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.554902  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.655019  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.755149  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.855256  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:03 z0rzpsap9003 kubelet: E1009 03:20:03.955363  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:04 z0rzpsap9003 kubelet: E1009 03:20:04.055466  137657 kubelet.go:2263] node "10.142.218.23" not found
Oct  9 03:20:04 z0rzpsap9003 kubelet: E1009 03:20:04.155553  137657 kubelet.go:2263] node "10.142.218.23" not found
` Oct  9 03:20:04 z0rzpsap9003 kubelet: E1009 03:20:04.241147  137657 reflector.go:153] k8s.io/kubernetes/pkg/kubelet/config/apiserver.go:46: Failed to list *v1.Pod: Get https://10.142.218.241:6443/api/v1/pods? `fieldSelector=spec.nodeName%3D10.142.218.23&limit=500&resourceVersion=0: dial tcp 10.142.218.241:6443: connect: no route to host

# 通哥查看日志发现kubelet一直报not found  而且报https://10.142.218.241:6443/api/v1/错误

4、登录master机器

# 1、 查看master节点的vip 无法找到
[root@z0rzpsap9003 log]# ip -4 a |grep 10.
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    inet 10.142.218.23/24 brd 10.142.218.255 scope global eth0 # 三台同理
# 2、查看keepalived服务   
[root@z0rzpsap9003 log]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
   Loaded: loaded (/usr/lib/systemd/system/keepalived.service; enabled; vendor preset: disabled)
   Active: active (running) since 三 2022-10-12 16:25:26 CST; 4h 12min ago  # 服务正常
  Process: 220321 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
 Main PID: 220323 (keepalived)
    Tasks: 3
# 3、查看keepaived检测脚本
[root@z0rzpsap9003 ~]# cat keepalived_checkkubeapiserver.sh 
#!/bin/bash

TOKEN=$(kubectl --kubeconfig=/root/admin.conf get secrets -o jsonpath=".items[?(@.metadata.annotations['kubernetes\\.io/service-account\\.name']=='default')].data.token"|base64 -d)
STATUS_CODE=$(curl -I -m 10 -o /dev/null -s -w %http_code -X GET https://localhost:6443/api --header "Authorization: Bearer $TOKEN" --insecure)
if test $STATUS_CODE -eq '200'
then
    exit 0
else
    exit 1
fi
# 手动执行 curl -I -m 10 -o /dev/null -s -w %http_code -X GET https://localhost:6443/api --header "Authorization: Bearer $TOKEN" --insecure  报错非200

5、故障处理

# 1、keepaived服务
`通过查看keepaived脚本,发现使用的是 https://localhost:6443（实际执行脚本用的是vip:6443）
# 2、查看那个脚本调用keepaivd检测脚本
修改server： https://localhost:6443

# 3、执行执行keepavied检测脚本 # （是成功的）
# 4、重新keepaived服务
systemctl  restart keepalived
# 5、查看集群是否正常
kubectl get node