1、查看系统环境版本
1.1、系统版本
1.1.1、Master节点
[root@master ~]# cat /etc/os-release NAME="CentOS Linux" VERSION="7 (Core)" ID="centos" ID_LIKE="rhel fedora" VERSION_ID="7" PRETTY_NAME="CentOS Linux 7 (Core)" ANSI_COLOR="0;31" CPE_NAME="cpe:/o:centos:centos:7" HOME_URL="https://www.centos.org/" BUG_REPORT_URL="https://bugs.centos.org/" CENTOS_MANTISBT_PROJECT="CentOS-7" CENTOS_MANTISBT_PROJECT_VERSION="7" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="7"
1.1.2、node1节点
root@node1:~# cat /etc/os-release PRETTY_NAME="Debian GNU/Linux 10 (buster)" NAME="Debian GNU/Linux" VERSION_ID="10" VERSION="10 (buster)" VERSION_CODENAME=buster ID=debian HOME_URL="https://www.debian.org/" SUPPORT_URL="https://www.debian.org/support" BUG_REPORT_URL="https://bugs.debian.org/"
1.2、K8S版本
1.2.1、master节点
[root@master ~]# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-16T11:54:15Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
1.2.2、node1节点
root@node1:~# kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-16T11:54:15Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
1.3、Docker版本
1.3.1、master节点
[root@master ~]# docker version Client: Docker Engine - Community Version: 19.03.8 API version: 1.40 Go version: go1.12.17 Git commit: afacb8b Built: Wed Mar 11 01:27:04 2020 OS/Arch: linux/amd64 Experimental: false Server: Docker Engine - Community Engine: Version: 19.03.8 API version: 1.40 (minimum version 1.12) Go version: go1.12.17 Git commit: afacb8b Built: Wed Mar 11 01:25:42 2020 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.2.6 GitCommit: 894b81a4b802e4eb2a91d1ce216b8817763c29fb runc: Version: 1.0.0-rc8 GitCommit: 425e105d5a03fabd737a126ad93d62a9eeede87f docker-init: Version: 0.18.0 GitCommit: fec3683
1.3.2、node1节点
root@node1:~# docker version Client: Docker Engine - Community Version: 19.03.8 API version: 1.40 Go version: go1.12.17 Git commit: afacb8b7f0 Built: Wed Mar 11 01:25:56 2020 OS/Arch: linux/amd64 Experimental: false Server: Docker Engine - Community Engine: Version: 19.03.8 API version: 1.40 (minimum version 1.12) Go version: go1.12.17 Git commit: afacb8b7f0 Built: Wed Mar 11 01:24:28 2020 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.2.13 GitCommit: 7ad184331fa3e55e52b890ea95e65ba581ae3429 runc: Version: 1.0.0-rc10 GitCommit: dc9208a3303feef5b3839f4323d9beb36df0a9dd docker-init: Version: 0.18.0 GitCommit: fec3683
2、错误提示
2.1、节点状态
[root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready master 2d2h v1.18.2 node1 NotReady <none> 31m v1.18.2 [root@master ~]#
2.2、组件状态
2.2.1、master节点查看
[root@master ~]# kubectl get pod -n kube-system -o wide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES coredns-7ff77c879f-78sl5 1/1 Running 2 2d2h 10.244.0.6 master <none> <none> coredns-7ff77c879f-pv744 1/1 Running 2 2d2h 10.244.0.7 master <none> <none> etcd-master 1/1 Running 2 2d2h 10.1.1.11 master <none> <none> kube-apiserver-master 1/1 Running 2 2d2h 10.1.1.11 master <none> <none> kube-controller-manager-master 1/1 Running 2 2d2h 10.1.1.11 master <none> <none> kube-flannel-ds-amd64-h5skl 1/1 Running 2 2d2h 10.1.1.11 master <none> <none> kube-flannel-ds-amd64-mg4n5 0/1 Init:0/1 0 31m 10.1.1.13 node1 <none> <none> kube-proxy-j7np7 1/1 Running 0 31m 10.1.1.13 node1 <none> <none> kube-proxy-x7s46 1/1 Running 2 2d2h 10.1.1.11 master <none> <none> kube-scheduler-master 1/1 Running 2 2d2h 10.1.1.11 master <none> <none>
2.2.2、查看node1节点容器运行状态
root@node1:~# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 76fee67569a2 registry.aliyuncs.com/google_containers/kube-proxy "/usr/local/bin/kube…" 33 minutes ago Up 33 minutes k8s_kube-proxy_kube-proxy-j7np7_kube-system_9c28dac9-f5f5-460e-93b3-d8679d0867e2_0 2c7fa6fa86a3 registry.aliyuncs.com/google_containers/pause:3.2 "/pause" 33 minutes ago Up 33 minutes k8s_POD_kube-proxy-j7np7_kube-system_9c28dac9-f5f5-460e-93b3-d8679d0867e2_0 0d570648b79f registry.aliyuncs.com/google_containers/pause:3.2 "/pause" 33 minutes ago Up 33 minutes k8s_POD_kube-flannel-ds-amd64-mg4n5_kube-system_c7496136-fe22-438d-8267-9d69f705311e_0 root@node1:~#
此时可以看到，在node1节点根本没有这个ds服务的容器，由于这个服务涉及到域名解析，然后想起来好像我在部署的时候没有设置主机映射，所以先尝试从hosts文件下手
2.3、查看hosts文件配置
2.3.1、master节点
[root@master ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 10.1.1.11 master 10.1.1.11 master
此时可以看到，少了node1节点的映射
2.3.2、node1节点
root@node1:~# cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 node1 # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters
同样的，在node1节点上也没有master节点的主机映射信息
2.3.3、更新主机映射
master节点
[root@master ~]# echo '10.1.1.13 node1' >> /etc/hosts [root@master ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 10.1.1.11 master 10.1.1.11 master 10.1.1.13 node1
node1节点
root@node1:~# echo -e "10.1.1.11 master Master\n10.1.1.13 node1 Node1" >> /etc/hosts root@node1:~# cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 node1 # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters 10.1.1.11 master Master 10.1.1.13 node1 Node1
2.4、主机通讯检测
2.4.1、master节点
[root@master ~]# ping node1 -c 5 PING node1 (10.1.1.13) 56(84) bytes of data. 64 bytes from node1 (10.1.1.13): icmp_seq=1 ttl=64 time=0.331 ms 64 bytes from node1 (10.1.1.13): icmp_seq=2 ttl=64 time=0.330 ms 64 bytes from node1 (10.1.1.13): icmp_seq=3 ttl=64 time=0.468 ms 64 bytes from node1 (10.1.1.13): icmp_seq=4 ttl=64 time=0.614 ms 64 bytes from node1 (10.1.1.13): icmp_seq=5 ttl=64 time=0.469 ms --- node1 ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 4002ms rtt min/avg/max/mdev = 0.330/0.442/0.614/0.107 ms
2.4.2、node1节点
root@node1:~# ping master -c 5 PING master (10.1.1.11) 56(84) bytes of data. 64 bytes from master (10.1.1.11): icmp_seq=1 ttl=64 time=0.479 ms 64 bytes from master (10.1.1.11): icmp_seq=2 ttl=64 time=0.262 ms 64 bytes from master (10.1.1.11): icmp_seq=3 ttl=64 time=0.249 ms 64 bytes from master (10.1.1.11): icmp_seq=4 ttl=64 time=0.428 ms 64 bytes from master (10.1.1.11): icmp_seq=5 ttl=64 time=0.308 ms --- master ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 94ms rtt min/avg/max/mdev = 0.249/0.345/0.479/0.092 ms
3、重启k8s服务
3.1、所有节点重启服务
master节点
[root@master ~]# systemctl restart kubelet docker [root@master ~]# kubectl get nodes The connection to the server 10.1.1.11:6443 was refused - did you specify the right host or port? [root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready master 2d2h v1.18.2 node1 NotReady <none> 45m v1.18.2
node1节点
root@node1:~# systemctl restart kubelet docker root@node1:~# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 9a8f714be9f6 0d40868643c6 "/usr/local/bin/kube…" About a minute ago Up About a minute k8s_kube-proxy_kube-proxy-j7np7_kube-system_9c28dac9-f5f5-460e-93b3-d8679d0867e2_2 aceb8ae3a07b registry.aliyuncs.com/google_containers/pause:3.2 "/pause" About a minute ago Up About a minute k8s_POD_kube-proxy-j7np7_kube-system_9c28dac9-f5f5-460e-93b3-d8679d0867e2_2 dd608fbcc5f5 registry.aliyuncs.com/google_containers/pause:3.2 "/pause" About a minute ago Up About a minute k8s_POD_kube-flannel-ds-amd64-mg4n5_kube-system_c7496136-fe22-438d-8267-9d69f705311e_0 e9b073aa917e 0d40868643c6 "/usr/local/bin/kube…" 2 minutes ago Exited (2) About a minute ago k8s_kube-proxy_kube-proxy-j7np7_kube-system_9c28dac9-f5f5-460e-93b3-d8679d0867e2_1 71d69c4dccc5 registry.aliyuncs.com/google_containers/pause:3.2 "/pause" 2 minutes ago Exited (0) About a minute ago k8s_POD_kube-proxy-j7np7_kube-system_9c28dac9-f5f5-460e-93b3-d8679d0867e2_1
3.2、删除node1节点，重新加入
3.2.1、删除节点
[root@master ~]# kubectl delete node node1 node "node1" deleted
3.2.2、生成注册命令
[root@master ~]# kubeadm token create --print-join-command W0425 01:02:19.391867 62603 configset.go:202] WARNING: kubeadm cannot validate component configs for API groups [kubelet.config.k8s.io kubeproxy.config.k8s.io] kubeadm join 10.1.1.11:6443 --token 757a06.wnp34zge3cdcqag6 --discovery-token-ca-cert-hash sha256:b1ab3a019f671de99e3af0d9fd023078ad64941a3b8cd56c2a65624f0a218642
3.2.3、删除所有容器（node1）
root@node1:~# docker ps -qa | xargs docker rm -f 5e71e6e988d8 5c2ff662e72b 9a8f714be9f6 aceb8ae3a07b dd608fbcc5f5
3.2.4、重新注册
root@node1:~# kubeadm join 10.1.1.11:6443 --token 757a06.wnp34zge3cdcqag6 --discovery-token-ca-cert-hash sha256:b1ab3a019f671de99e3af0d9fd023078ad64941a3b8cd56c2a65624f0a218642 W0425 01:03:08.461617 22573 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set. [preflight] Running pre-flight checks [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/ error execution phase preflight: [preflight] Some fatal errors occurred: [ERROR FileAvailable--etc-kubernetes-kubelet.conf]: /etc/kubernetes/kubelet.conf already exists [ERROR Port-10250]: Port 10250 is in use [ERROR FileAvailable--etc-kubernetes-pki-ca.crt]: /etc/kubernetes/pki/ca.crt already exists [preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...` To see the stack trace of this error execute with --v=5 or higher
下面开始解决报错
3.3、解决重新注册失败的问题
3.3.1、删除旧的配置文件
root@node1:~# rm -f /etc/kubernetes/kubelet.conf
3.3.2、重启k8s及docker服务
root@node1:~# systemctl restart docker kubelet root@node1:~#
3.3.3、删除旧的ca文件
root@node1:~# rm -f /etc/kubernetes/pki/ca.crt root@node1:~#
3.4、重新注册
node节点
root@node1:~# kubeadm join 10.1.1.11:6443 --token 757a06.wnp34zge3cdcqag6 --discovery-token-ca-cert-hash sha256:b1ab3a019f671de99e3af0d9fd023078ad64941a3b8cd56c2a65624f0a218642 W0425 01:09:45.778629 23773 join.go:346] [preflight] WARNING: JoinControlPane.controlPlane settings will be ignored when control-plane flag is not set. [preflight] Running pre-flight checks [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/ [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml' [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.18" ConfigMap in the kube-system namespace [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Starting the kubelet [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap... This node has joined the cluster: * Certificate signing request was sent to apiserver and a response was received. * The Kubelet was informed of the new secure connection details. Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
master节点
[root@master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION master Ready master 2d2h v1.18.2 node1 Ready <none> 38s v1.18.2
至此，问题解决！所以导致这个问题的主要原因就是前期没有设置主机映射