我按照本指南部署了一个 3 节点 CoreOS Vagrant VM,按照此处所述进行了修改。
虚拟机运行良好;K8s 控制器/工作节点很好;我可以部署 Pod;副本集;等等
但是,DNS 似乎不起作用,当我查看flannel
pod 的状态时,它们肯定是不健康的:
$ kubectl get po --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
apps frontend-cluster-q4gvm 1/1 Running 1 1h
apps frontend-cluster-tl5ts 1/1 Running 0 1h
apps frontend-cluster-xgktz 1/1 Running 1 1h
kube-system kube-apiserver-172.17.8.101 1/1 Running 2 32d
kube-system kube-controller-manager-172.17.8.101 1/1 Running 2 32d
kube-system kube-flannel-ds-6csjl 0/1 CrashLoopBackOff 46 31d
kube-system kube-flannel-ds-f8czg 0/1 CrashLoopBackOff 48 31d
kube-system kube-flannel-ds-qbtlc 0/1 CrashLoopBackOff 52 31d
kube-system kube-proxy-172.17.8.101 1/1 Running 2 32d
kube-system kube-proxy-172.17.8.102 1/1 Running 0 6m
kube-system kube-proxy-172.17.8.103 1/1 Running 0 2m
kube-system kube-scheduler-172.17.8.101 1/1 Running 2 32d
此外,当我尝试kubedns
使用相同的故障模式部署这些失败时:
$ kubectl logs kube-flannel-ds-f8czg -n kube-system
I0608 23:03:32.526331 1 main.go:475] Determining IP address of default interface
I0608 23:03:32.528108 1 main.go:488] Using interface with name eth0 and address 10.0.2.15
I0608 23:03:32.528135 1 main.go:505] Defaulting external address to interface address (10.0.2.15)
E0608 23:04:02.627348 1 main.go:232] Failed to create SubnetManager: error retrieving pod spec for 'kube-system/kube-flannel-ds-f8czg': Get https://10.3.0.1:443/api/v1/namespaces/kube-system/pods/kube-flannel-ds-f8czg: dial tcp 10.3.0.1:443: i/o timeout
因此,似乎10.3.0.1
无法从其他 pod 访问通过 IP 运行的控制器服务:
$ kubectl get svc --all-namespaces
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
apps frontend ClusterIP 10.3.0.170 <none> 80/TCP,443/TCP 1h
default kubernetes ClusterIP 10.3.0.1 <none> 443/TCP 32d
我的猜测是围绕 Flannel 的etcd
配置。或kube-proxy
YAML;所以,我在所有节点中添加了以下内容:
core@core-01 ~ $ etcdctl ls /flannel/network/subnets
/flannel/network/subnets/10.1.80.0-24
/flannel/network/subnets/10.1.76.0-24
/flannel/network/subnets/10.3.0.0-16
/flannel/network/subnets/10.1.34.0-24
core@core-01 ~ $ etcdctl get /flannel/network/subnets/10.3.0.0-16
{"PublicIP": "172.17.8.101"}
并重新启动flanneld
:
core@core-01 ~ $ sudo systemctl restart flanneld
但是,这似乎没有任何好处;从正在运行的 Pod 中:
# This is expected (no client certs):
root@frontend-cluster-q4gvm:/opt/simple# curl -k https://172.17.8.101/api/v1/pods
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {
},
"status": "Failure",
"message": "Unauthorized",
"reason": "Unauthorized",
"code": 401
}
# But this one just times out:
root@frontend-cluster-q4gvm:/opt/simple# curl -k https://10.3.0.1/api/v1/pods
然后我查看kube-proxy.yaml
并怀疑--master
配置(对于工作节点)不正确,不知何故?
core@core-02 /etc/kubernetes/manifests $ cat kube-proxy.yaml
apiVersion: v1
kind: Pod
metadata:
name: kube-proxy
namespace: kube-system
spec:
hostNetwork: true
containers:
- name: kube-proxy
image: quay.io/coreos/hyperkube:v1.10.1_coreos.0
command:
- /hyperkube
- proxy
>>>>> Should it be like this?
- --master=https://172.17.8.101
>>>>> or like this?
- --master=http://127.0.0.1:8080
securityContext:
privileged: true
volumeMounts:
- mountPath: /etc/ssl/certs
name: ssl-certs-host
readOnly: true
volumes:
- hostPath:
path: /usr/share/ca-certificates
name: ssl-certs-host
该127.0.0.1:8080
配置似乎仅(充其量)对控制器节点起作用,但肯定会在其他节点上无处可去?
--master
但是,如上所述修改并重新启动 pod 也没有任何好处。
底线是,如何使控制器 API 可访问10.3.0.1
?如何启用 KubeDNS(我尝试了“Hard Way”指南中的说明,但得到的故障模式与上述完全相同)。
提前谢谢了!
更新
这是带有flanneld
选项的文件:
$ cat /etc/flannel/options.env
FLANNELD_IFACE=172.17.8.101
FLANNELD_ETCD_ENDPOINTS=http://172.17.8.102:2379,http://172.17.8.103:2379,http://172.17.8.101:2379
我现在已经删除了 flannel 守护程序集:
kc delete ds kube-flannel-ds -n kube-system
并按照以下说明部署 Kube DNS:服务定义在这里,部署在这里:
$ kc -n kube-system get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kube-dns ClusterIP 10.3.0.10 <none> 53/UDP,53/TCP 4d
$ kc get po -n kube-system
NAME READY STATUS RESTARTS AGE
kube-apiserver-172.17.8.101 1/1 Running 5 36d
kube-controller-manager-172.17.8.101 1/1 Running 5 36d
kube-dns-7868b65c7b-ntc95 3/4 Running 2 3m
kube-proxy-172.17.8.101 1/1 Running 5 36d
kube-proxy-172.17.8.102 1/1 Running 3 4d
kube-proxy-172.17.8.103 1/1 Running 2 4d
kube-scheduler-172.17.8.101 1/1 Running 5 36d
但是,我仍然收到超时错误(实际上是一堆):
E0613 19:02:27.193691 1 sync.go:105] Error getting ConfigMap kube-system:kube-dns err: Get https://10.3.0.1:443/api/v1/namespaces/kube-system/configmaps/kube-dns: dial tcp 10.3.0.1:443: i/o timeout
更新#2
在类似的系统设置上,我具有以下flanneld
配置:
core@core-02 ~ $ etcdctl get /flannel/network/config
{ "Network": "10.1.0.0/16" }
core@core-02 ~ $ etcdctl ls /flannel/network/subnets
/flannel/network/subnets/10.1.5.0-24
/flannel/network/subnets/10.1.66.0-24
/flannel/network/subnets/10.1.6.0-24
core@core-02 ~ $ etcdctl get /flannel/network/subnets/10.1.66.0-24
{"PublicIP":"172.17.8.102"}
(对于其他人来说也是如此,指向101
and ) -子网103
应该有什么东西config
吗?此外,控制器 API10.3.0.0/16
是否应该有一个条目(指向) ?类似于以下内容:172.17.8.101
10.3.0.1
/flannel/network/subnets/10.3.0.0-24
{"PublicIP":"172.17.8.101"}
有谁知道在哪里可以找到好的flanneld
文档(CoreOS 文档确实不够用,感觉有点“被遗弃”)?或者其他可以实际使用的东西?
谢谢!