Kubernetes安装报错总结

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1.kubeadm  init初使化报错

[root@k8s01 ~]# kubeadm  init --kubernetes-version=v1.13.3 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12 --ignore-preflight-errors=Swap

[init] Using Kubernetes version: v1.13.3

[preflight] Running pre-flight checks

[WARNING Swap]: running with swap on is not supported. Please disable swap

[WARNING SystemVerification]: this Docker version is not on the list of validated versions: 18.09.2. Latest validated version: 18.06

[preflight] Pulling images required for setting up a Kubernetes cluster

[preflight] This might take a minute or two, depending on the speed of your internet connection

[preflight] You can also perform this action in beforehand using 'kubeadm config images pull'

error execution phase preflight: [preflight] Some fatal errors occurred:

[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-apiserver:v1.13.3: output: Error response from daemon: Get https://k8s.gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

, error: exit status 1

[ERROR ImagePull]: failed to pull image k8s.gcr.io/kube-controller-manager:v1.13.3: output: Error response from daemon: Get https://k8s.gcr.io/v2/: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)

, error: exit status 1

解决方法：

[root@k8s01 ~]# cat 12.sh

#!/bin/bash

docker pull mirrorgooglecontainers/kube-apiserver:v1.13.3

docker pull mirrorgooglecontainers/kube-controller-manager:v1.13.3

docker pull mirrorgooglecontainers/kube-scheduler:v1.13.3

docker pull mirrorgooglecontainers/kube-proxy:v1.13.3

docker pull mirrorgooglecontainers/pause:3.1

docker pull mirrorgooglecontainers/etcd:3.2.24

docker pull coredns/coredns:1.2.6

docker tag mirrorgooglecontainers/kube-proxy:v1.13.3  k8s.gcr.io/kube-proxy:v1.13.3

docker tag mirrorgooglecontainers/kube-scheduler:v1.13.3 k8s.gcr.io/kube-scheduler:v1.13.3

docker tag mirrorgooglecontainers/kube-apiserver:v1.13.3 k8s.gcr.io/kube-apiserver:v1.13.3

docker tag mirrorgooglecontainers/kube-controller-manager:v1.13.3 k8s.gcr.io/kube-controller-manager:v1.13.3

docker tag mirrorgooglecontainers/etcd:3.2.24  k8s.gcr.io/etcd:3.2.24

docker tag coredns/coredns:1.2.6 k8s.gcr.io/coredns:1.2.6

docker tag mirrorgooglecontainers/pause:3.1  k8s.gcr.io/pause:3.1

docker rmi mirrorgooglecontainers/kube-apiserver:v1.13.3

docker rmi mirrorgooglecontainers/kube-controller-manager:v1.13.3

docker rmi mirrorgooglecontainers/kube-scheduler:v1.13.3

docker rmi mirrorgooglecontainers/kube-proxy:v1.13.3

docker rmi mirrorgooglecontainers/pause:3.1

docker rmi mirrorgooglecontainers/etcd:3.2.24

docker rmi coredns/coredns:1.2.6:q

[root@k8s01 ~]#  ./12.sh

2.关闭swap交换分区

Unfortunately, an error has occurred:

timed out waiting for the condition

This error is likely caused by:

- The kubelet is not running

- The kubelet is unhealthy due to a misconfiguration of the node in some way (required cgroups disabled)

If you are on a systemd-powered system, you can try to troubleshoot the error with the following commands:

- 'systemctl status kubelet'

- 'journalctl -xeu kubelet'

解决方法：

[root@k8s1 ~]# echo "KUBELET_EXTRA_ARGS=--fail-swap-> /etc/sysconfig/kubelet

[root@k8s1 ~]# vim /etc/fstab

#UUID=c5f6d686-6b5a-48ae-92c0-df2f44b6402b swap      swap    defaults        0 0     --注释swap

[root@k8s1 ~]#

3.k8s从节点pod不能显示

[root@k8s2 ~]# kubectl  get pods

The connection to the server localhost:8080 was refused - did you specify the right host or port?

[root@k8s2 ~]#

解决方法:

[root@k8s1 ~]# scp -r /etc/kubernetes/admin.conf root@k8s2:/etc/kubernetes/    --将admin.conf文件拷贝到其它从节点

[root@k8s2 ~]# vim /root/.bash_profile       --在各个从节点添加环境变量

export KUBECONFIG=/etc/kubernetes/admin.conf

[root@k8s2 ~]# source  /root/.bash_profile

4.使用Harbor上传镜像报错

[root@node1 ~]# docker login http://192.168.8.10

Username: admin

Password:

Error response from daemon: Get https://192.168.8.10/v2/: dial tcp 192.168.8.10:443: connect: connection refused

解决方法:

[root@node1 harbor]# vim /usr/lib/systemd/system/docker.service     --修改参数

ExecStart=/usr/bin/dockerd -H fd:// --insecure-registry=192.168.8.10

[root@node1 harbor]# systemctl daemon-reload

[root@node1 harbor]# systemctl restart docker

[root@node1 harbor]# ps -ef | grep -i docker

root      808561    1884  0 16:08 ?        00:00:00 containerd-shim -namespace moby -workdir /var/lib/containerd/io.containerd.runtime.v1.linux/moby/5f13be571995f00b5ec00b8941f612bbf0b5429ae183ab0553e579d31c43f300 -address /run/containerd/containerd.sock -containerd-binary /usr/bin/containerd -runtime-root /var/run/docker/runtime-runc

root      874547       1  6 16:50 ?        00:00:00 /usr/bin/dockerd -H fd:// --insecure-registry=192.168.8.10

[root@node1 harbor]# docker-compose ps

Name                     Command               State                                Ports

------------------------------------------------------------------------------------------------------------------------------

harbor-adminserver   /harbor/start.sh                 Up

harbor-core          /harbor/start.sh                 Up

harbor-db            /entrypoint.sh postgres          Up      5432/tcp

harbor-jobservice    /harbor/start.sh                 Up

harbor-log           /bin/sh -c /usr/local/bin/ ...   Up      127.0.0.1:1514->10514/tcp

harbor-portal        nginx -g daemon off;             Up      80/tcp

nginx                nginx -g daemon off;             Up      0.0.0.0:443->443/tcp, 0.0.0.0:4443->4443/tcp, 0.0.0.0:80->80/tcp

redis                docker-entrypoint.sh redis ...   Up      6379/tcp

registry             /entrypoint.sh /etc/regist ...   Up      5000/tcp

registryctl          /harbor/start.sh                 Up

[root@node1 harbor]# docker login 192.168.8.10

Username: admin

Password:

WARNING! Your password will be stored unencrypted in /root/.docker/config.json.

Configure a credential helper to remove this warning. See

https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded

[root@node1 harbor]#

5.在kubernetes添加节点后提示CNI问题

[root@k8s1 ~]# kubectl describe pods ecs-web-desktop-7cbc98dcdb-nw4fw -n ecs-local-area

Normal   SuccessfulMountVolume   8h      kubelet, ecsnode03  MountVolume.SetUp succeeded for volume "volume-data"
  Normal   SuccessfulMountVolume   8h      kubelet, ecsnode03  MountVolume.SetUp succeeded for volume "setenv-sh"
  Normal   SuccessfulMountVolume   8h      kubelet, ecsnode03  MountVolume.SetUp succeeded for volume "default-token-69l45"
  Warning  FailedCreatePodSandBox  8h (x11 over 8h)   kubelet, ecsnode03  Failed create pod sandbox: rpc error: code = Unknown desc = NetworkPlugin cni failed to set up pod "ecs-web-desktop-7cbc98dcdb-nw4fw_ecs-local-area" network: could not initialize etcdv3 client: open /etc/cni/etcd/pki/calico-etcd-client.crt: no such file or directory
  Normal   SandboxChanged          8h (x123 over 8h)  kubelet, ecsnode03  Pod sandbox changed, it will be killed and re-created.
  Normal   Scheduled               7m                 default-scheduler   Successfully assigned ecs-web-desktop-7cbc98dcdb-nw4fw to ecsnode03

解决方法:

是因为master节点etcd没有新节点数据信息，过5分钟就可以了。

6.安装kubenetes到成功后CoreDNS频繁重启(原因是Iptables规则乱了)

[root@k8s01 yum.repos.d]# kubectl  get pods -n kube-system | grep coredns

NAME                            READY   STATUS             RESTARTS   AGE

coredns-5c98db65d4-8vc5h        0/1     CrashLoopBackOff   3          7m42s

coredns-5c98db65d4-vq9j5        0/1     CrashLoopBackOff   3          7m42s

[root@k8s01 yum.repos.d]# kubectl logs pods coredns-5c98db65d4-8vc5h -n kube-system

Error from server (NotFound): pods "pods" not found

[root@k8s01 yum.repos.d]# kubectl logs  coredns-5c98db65d4-8vc5h -n kube-system

E0907 06:44:40.045232       1 reflector.go:134] github.com/coredns/coredns/plugin/kubernetes/controller.go:317: Failed to list *v1.Endpoints: Get https://10.96.0.1:443/api/v1/endpoints?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host

E0907 06:44:40.045232       1 reflector.go:134] github.com/coredns/coredns/plugin/kubernetes/controller.go:317: Failed to list *v1.Endpoints: Get https://10.96.0.1:443/api/v1/endpoints?limit=500&resourceVersion=0: dial tcp 10.96.0.1:443: connect: no route to host

log: exiting because of error: log: cannot create log: open /tmp/coredns.coredns-5c98db65d4-8vc5h.unknownuser.log.ERROR.20190907-064440.1: no such file or directory

[root@k8s01 yum.repos.d]#

解决方法:

[root@k8s01 yum.repos.d]# iptables -F

[root@k8s01 yum.repos.d]# iptables -Z

[root@k8s01 yum.repos.d]# systemctl restart kubelet

[root@k8s01 yum.repos.d]# systemctl restart docker

[root@k8s01 yum.repos.d]# kubectl  get pods -n kube-system  | grep coredns

NAME                            READY   STATUS    RESTARTS   AGE

coredns-5c98db65d4-8vc5h        1/1     Running   7          12m

coredns-5c98db65d4-vq9j5        1/1     Running   8          12m

[root@k8s01 yum.repos.d]#

7.集群coredns组件挂起状态（flannel组件未初使化，需要重新安装）

[root@k8s01 ~]# kubectl get pods -n kube-system | grep -i coredns
coredns-5644d7b6d9-8wvgt          0/1     ContainerCreating            0          79m
coredns-5644d7b6d9-pzr7g          0/1     ContainerCreating            0          79m

[root@k8s01 ~]# journalctl  -u kubelet -f

Oct 19 14:46:20 k8s01 kubelet[653]: E1019 14:46:20.701679     653 pod_workers.go:191] Error syncing pod e641b551-7f22-40fa-b847-658f6c7696fa ("tiller-deploy-8557598fbc-6jfp7_kube-system(e641b551-7f22-40fa-b847-658f6c7696fa)"), skipping: network is not ready: runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Oct 19 14:46:20 k8s01 kubelet[653]: E1019 14:46:20.702091     653 pod_workers.go:191] Error syncing pod bd45bbe0-8529-4ee4-9fcf-90528178dc0d ("coredns-5c98db65d4-rtktb_kube-system(bd45bbe0-8529-4ee4-9fcf-90528178dc0d)"), skipping: network is not ready: runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized
Oct 19 14:46:20 k8s01 kubelet[653]: E1019 14:46:20.702396     653 pod_workers.go:191] Error syncing pod 87d24c8c-bba8-420b-8901-9e2b8bc339ac ("coredns-5644d7b6d9-8wvgt_kube-system(87d24c8c-bba8-420b-8901-9e2b8bc339ac)"), skipping: network is not ready: runtime network not ready: NetworkReady=false reason:NetworkPluginNotReady message:docker: network plugin is not ready: cni config uninitialized

解决方法：

[root@k8s01 ~]# wget https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

[root@k8s01 ~]# kubectl apply -f  kube-flannel.yml
podsecuritypolicy.policy/psp.flannel.unprivileged configured
clusterrole.rbac.authorization.k8s.io/flannel unchanged
clusterrolebinding.rbac.authorization.k8s.io/flannel unchanged
serviceaccount/flannel unchanged
configmap/kube-flannel-cfg configured
daemonset.apps/kube-flannel-ds-amd64 configured
daemonset.apps/kube-flannel-ds-arm64 configured
daemonset.apps/kube-flannel-ds-arm configured
daemonset.apps/kube-flannel-ds-ppc64le configured
daemonset.apps/kube-flannel-ds-s390x configured
[root@k8s01 ~]# kubectl get pods -n kube-system | grep -i coredns
coredns-5644d7b6d9-8wvgt          1/1     Running            0          92m
coredns-5644d7b6d9-pzr7g          1/1     Running            0          92m
[root@k8s01 ~]#

8.在k8s集群中apiserver占用很高的CPU资源，导致频繁重启。

[root@ecsmaster01 ~]# kubectl  get nodes
The connection to the server 172.31.129.93:6443 was refused - did you specify the right host or port?
[root@ecsmaster01 ~]#

解决方法：

(1).服务器时间不对

[root@ecsmaster01 ~]# date
Fri Oct 25 05:04:24 CST 2019

[root@ecsmaster01 ~]# ntpdate   time1.aliyun.com
25 Oct 13:04:46 ntpdate[5017]: step time server 203.107.6.88 offset 28800.550337 sec
[root@ecsmaster01 ~]# date
Fri Oct 25 13:04:54 CST 2019
[root@ecsmaster01 ~]#

(2).查看系统日志(从日志查看出与etcd pod有关)

[root@ecsmaster01 ~]# tail -200f /var/log/messages

Oct 25 05:04:43 localhost kernel: XFS (dm-5): Unmounting Filesystem
Oct 25 05:04:43 localhost dockerd: time="2019-10-25T05:04:43.961739020+08:00" level=error msg="Handler for POST /v1.24/containers/c2d922d8a203383725b819e497272b25b8e8db315d03a75540b6fbfb3a3ed565/stop returned error: Container c2d922d8a203383725b819e497272b25b8e8db315d03a75540b6fbfb3a3ed565 is already stopped"
Oct 25 05:04:44 localhost kernel: XFS (dm-2): Unmounting Filesystem
Oct 25 05:04:44 localhost dockerd: time="2019-10-25T05:04:44.187195506+08:00" level=error msg="Handler for POST /v1.24/containers/create returned error: Conflict. The name \"/k8s_POD_etcd-ecsmaster01_kube-system_fb87a1f1730f1fe65cd7ce2b1d5a84b8_3\" is already in use by container a468c762916792739e99fc48a85c4a24ce848e09c430be1da99a44576266e548. You have to remove (or rename) that container to be able to reuse that name."
Oct 25 05:04:44 localhost kubelet: W1025 05:04:44.187756    8889 helpers.go:284] Unable to create pod sandbox due to conflict. Attempting to remove sandbox "a468c762916792739e99fc48a85c4a24ce848e09c430be1da99a44576266e548"
Oct 25 05:04:44 localhost systemd-udevd: inotify_add_watch(7, /dev/dm-2, 10) failed: No such file or directory
Oct 25 05:04:44 localhost kubelet: E1025 05:04:44.481171    8889 remote_runtime.go:92] RunPodSandbox from runtime service failed: rpc error: code = Unknown desc = failed to create a sandbox for pod "etcd-ecsmaster01": Error response from daemon: Conflict. The name "/k8s_POD_etcd-ecsmaster01_kube-system_fb87a1f1730f1fe65cd7ce2b1d5a84b8_3" is already in use by container a468c762916792739e99fc48a85c4a24ce848e09c430be1da99a44576266e548. You have to remove (or rename) that container to be able to reuse that name.
Oct 25 05:04:44 localhost kubelet: E1025 05:04:44.481217    8889 kuberuntime_sandbox.go:54] CreatePodSandbox for pod "etcd-ecsmaster01_kube-system(fb87a1f1730f1fe65cd7ce2b1d5a84b8)" failed: rpc error: code = Unknown desc = failed to create a sandbox for pod "etcd-ecsmaster01": Error response from daemon: Conflict. The name "/k8s_POD_etcd-ecsmaster01_kube-system_fb87a1f1730f1fe65cd7ce2b1d5a84b8_3" is already in use by container a468c762916792739e99fc48a85c4a24ce848e09c430be1da99a44576266e548. You have to remove (or rename) that container to be able to reuse that name.

(3).杀死etcd，apiserver进程

[root@ecsmaster01 ~]# ps -ef | grep etcd

[root@ecsmaster01 ~]# kill 6577

[root@ecsmaster01 ~]# ps -ef | grep apiserver

[root@ecsmaster01 ~]# kill 11737

[root@ecsmaster01 ~]# systemctl restart kubelet

(4).问题解决

[root@ecsmaster01 ~]# kubectl  get nodes
NAME          STATUS    ROLES     AGE       VERSION
ecsmaster01   Ready     master    70d       v1.10.0
ecsnode01     Ready     <none>    70d       v1.10.0
[root@ecsmaster01 ~]#

9.使用kubectl查看不到节点，apiserver进程没有

[root@k8s01 ~]# kubectl  get nodes
The connection to the server 192.168.54.128:6443 was refused - did you specify the right host or port?
[root@k8s01 ~]# ps -ef | grep etcd
root       5833   4841  0 13:47 pts/0    00:00:00 grep --color=auto etcd
[root@k8s01 ~]# ps -ef | grep apiserver
root       5911   4841  0 13:47 pts/0    00:00:00 grep --color=auto apiserver

解决方法：

[root@k8s01 docker]# docker images    --查看镜像时没有镜像
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
[root@k8s01 ~]# cat 16.sh
#!/bin/bash
# download k8s 1.15.2 images
# get image-list by 'kubeadm config images list --kubernetes-version=v1.15.2'
# gcr.azk8s.cn/google-containers == k8s.gcr.io
images=(
kube-apiserver:v1.16.0
kube-controller-manager:v1.16.0
kube-scheduler:v1.16.0
kube-proxy:v1.16.0
pause:3.1
etcd:3.3.15-0
coredns:1.6.2
)
for imageName in ${images[@]};do
    docker pull gcr.azk8s.cn/google-containers/$imageName 
    docker tag  gcr.azk8s.cn/google-containers/$imageName k8s.gcr.io/$imageName 
    docker rmi  gcr.azk8s.cn/google-containers/$imageName
done
[root@k8s01 ~]# sh 16.sh    --拉取镜像

[root@k8s01 ~]# docker images
REPOSITORY                           TAG                 IMAGE ID            CREATED             SIZE
k8s.gcr.io/kube-apiserver            v1.16.0             b305571ca60a        5 weeks ago         217MB
k8s.gcr.io/kube-proxy                v1.16.0             c21b0c7400f9        5 weeks ago         86.1MB
k8s.gcr.io/kube-controller-manager   v1.16.0             06a629a7e51c        5 weeks ago         163MB
k8s.gcr.io/kube-scheduler            v1.16.0             301ddc62b80b        5 weeks ago         87.3MB
k8s.gcr.io/etcd                      3.3.15-0            b2756210eeab        7 weeks ago         247MB
k8s.gcr.io/coredns                   1.6.2               bf261d157914        2 months ago        44.1MB
k8s.gcr.io/pause                     3.1                 da86e6ba6ca1        22 months ago       742kB
[root@k8s01 ~]# kubectl  get nodes
NAME    STATUS   ROLES    AGE   VERSION
k8s01   Ready    master   48d   v1.16.0
k8s02   Ready    <none>   48d   v1.16.0
k8s03   Ready    <none>   8d    v1.16.0
[root@k8s01 ~]#

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