【发布时间】：2017-07-27 00:33:42
【问题描述】：
我已通过 CoreOS alpha (1353.1.0) 在 Container Linux 上安装了 Kubernetes 使用 hyperkube v1.5.5_coreos.0 使用我的 coreos-kubernetes 分支安装脚本https://github.com/kfirufk/coreos-kubernetes。
我有两台 ContainerOS 机器。
- coreos-2.tux-in.com 解析为 192.168.1.2 作为控制器
- coreos-3.tux-in.com 解析为 192.168.1.3 as worker
kubectl get pods --all-namespaces 返回
NAMESPACE NAME READY STATUS RESTARTS AGE
ceph ceph-mds-2743106415-rkww4 0/1 Pending 0 1d
ceph ceph-mon-check-3856521781-bd6k5 1/1 Running 0 1d
kube-lego kube-lego-3323932148-g2tf4 1/1 Running 0 1d
kube-system calico-node-xq6j7 2/2 Running 0 1d
kube-system calico-node-xzpp2 2/2 Running 4560 1d
kube-system calico-policy-controller-610849172-b7xjr 1/1 Running 0 1d
kube-system heapster-v1.3.0-beta.0-2754576759-v1f50 2/2 Running 0 1d
kube-system kube-apiserver-192.168.1.2 1/1 Running 0 1d
kube-system kube-controller-manager-192.168.1.2 1/1 Running 1 1d
kube-system kube-dns-3675956729-r7hhf 3/4 Running 3924 1d
kube-system kube-dns-autoscaler-505723555-l2pph 1/1 Running 0 1d
kube-system kube-proxy-192.168.1.2 1/1 Running 0 1d
kube-system kube-proxy-192.168.1.3 1/1 Running 0 1d
kube-system kube-scheduler-192.168.1.2 1/1 Running 1 1d
kube-system kubernetes-dashboard-3697905830-vdz23 1/1 Running 1246 1d
kube-system monitoring-grafana-4013973156-m2r2v 1/1 Running 0 1d
kube-system monitoring-influxdb-651061958-2mdtf 1/1 Running 0 1d
nginx-ingress default-http-backend-150165654-s4z04 1/1 Running 2 1d
所以我可以看到kube-dns-782804071-h78rf 不断重启。
kubectl describe pod kube-dns-3675956729-r7hhf --namespace=kube-system 返回：
Name: kube-dns-3675956729-r7hhf
Namespace: kube-system
Node: 192.168.1.2/192.168.1.2
Start Time: Sat, 11 Mar 2017 17:54:14 +0000
Labels: k8s-app=kube-dns
pod-template-hash=3675956729
Status: Running
IP: 10.2.67.243
Controllers: ReplicaSet/kube-dns-3675956729
Containers:
kubedns:
Container ID: rkt://f6480fe7-4316-4e0e-9483-0944feb85ea3:kubedns
Image: gcr.io/google_containers/kubedns-amd64:1.9
Image ID: rkt://sha512-c7b7c9c4393bea5f9dc5bcbe1acf1036c2aca36ac14b5e17fd3c675a396c4219
Ports: 10053/UDP, 10053/TCP, 10055/TCP
Args:
--domain=cluster.local.
--dns-port=10053
--config-map=kube-dns
--v=2
Limits:
memory: 170Mi
Requests:
cpu: 100m
memory: 70Mi
State: Running
Started: Sun, 12 Mar 2017 17:47:41 +0000
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Sun, 12 Mar 2017 17:46:28 +0000
Finished: Sun, 12 Mar 2017 17:47:02 +0000
Ready: False
Restart Count: 981
Liveness: http-get http://:8080/healthz-kubedns delay=60s timeout=5s period=10s #success=1 #failure=5
Readiness: http-get http://:8081/readiness delay=3s timeout=5s period=10s #success=1 #failure=3
Volume Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-zqbdp (ro)
Environment Variables:
PROMETHEUS_PORT: 10055
dnsmasq:
Container ID: rkt://f6480fe7-4316-4e0e-9483-0944feb85ea3:dnsmasq
Image: gcr.io/google_containers/kube-dnsmasq-amd64:1.4.1
Image ID: rkt://sha512-8c5f8b40f6813bb676ce04cd545c55add0dc8af5a3be642320244b74ea03f872
Ports: 53/UDP, 53/TCP
Args:
--cache-size=1000
--no-resolv
--server=127.0.0.1#10053
--log-facility=-
Requests:
cpu: 150m
memory: 10Mi
State: Running
Started: Sun, 12 Mar 2017 17:47:41 +0000
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Sun, 12 Mar 2017 17:46:28 +0000
Finished: Sun, 12 Mar 2017 17:47:02 +0000
Ready: True
Restart Count: 981
Liveness: http-get http://:8080/healthz-dnsmasq delay=60s timeout=5s period=10s #success=1 #failure=5
Volume Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-zqbdp (ro)
Environment Variables: <none>
dnsmasq-metrics:
Container ID: rkt://f6480fe7-4316-4e0e-9483-0944feb85ea3:dnsmasq-metrics
Image: gcr.io/google_containers/dnsmasq-metrics-amd64:1.0.1
Image ID: rkt://sha512-ceb3b6af1cd67389358be14af36b5e8fb6925e78ca137b28b93e0d8af134585b
Port: 10054/TCP
Args:
--v=2
--logtostderr
Requests:
memory: 10Mi
State: Running
Started: Sun, 12 Mar 2017 17:47:41 +0000
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Sun, 12 Mar 2017 17:46:28 +0000
Finished: Sun, 12 Mar 2017 17:47:02 +0000
Ready: True
Restart Count: 981
Liveness: http-get http://:10054/metrics delay=60s timeout=5s period=10s #success=1 #failure=5
Volume Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-zqbdp (ro)
Environment Variables: <none>
healthz:
Container ID: rkt://f6480fe7-4316-4e0e-9483-0944feb85ea3:healthz
Image: gcr.io/google_containers/exechealthz-amd64:v1.2.0
Image ID: rkt://sha512-3a85b0533dfba81b5083a93c7e091377123dac0942f46883a4c10c25cf0ad177
Port: 8080/TCP
Args:
--cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1 >/dev/null
--url=/healthz-dnsmasq
--cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1:10053 >/dev/null
--url=/healthz-kubedns
--port=8080
--quiet
Limits:
memory: 50Mi
Requests:
cpu: 10m
memory: 50Mi
State: Running
Started: Sun, 12 Mar 2017 17:47:41 +0000
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Sun, 12 Mar 2017 17:46:28 +0000
Finished: Sun, 12 Mar 2017 17:47:02 +0000
Ready: True
Restart Count: 981
Volume Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-zqbdp (ro)
Environment Variables: <none>
Conditions:
Type Status
Initialized True
Ready False
PodScheduled True
Volumes:
default-token-zqbdp:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-zqbdp
QoS Class: Burstable
Tolerations: CriticalAddonsOnly=:Exists
No events.
这表明kubedns-amd64:1.9 在Ready: false 中
这是我的kude-dns-de.yaml 文件：
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
spec:
strategy:
rollingUpdate:
maxSurge: 10%
maxUnavailable: 0
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
annotations:
scheduler.alpha.kubernetes.io/critical-pod: ''
scheduler.alpha.kubernetes.io/tolerations: '[{"key":"CriticalAddonsOnly", "operator":"Exists"}]'
spec:
containers:
- name: kubedns
image: gcr.io/google_containers/kubedns-amd64:1.9
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
livenessProbe:
httpGet:
path: /healthz-kubedns
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /readiness
port: 8081
scheme: HTTP
initialDelaySeconds: 3
timeoutSeconds: 5
args:
- --domain=cluster.local.
- --dns-port=10053
- --config-map=kube-dns
# This should be set to v=2 only after the new image (cut from 1.5) has
# been released, otherwise we will flood the logs.
- --v=2
env:
- name: PROMETHEUS_PORT
value: "10055"
ports:
- containerPort: 10053
name: dns-local
protocol: UDP
- containerPort: 10053
name: dns-tcp-local
protocol: TCP
- containerPort: 10055
name: metrics
protocol: TCP
- name: dnsmasq
image: gcr.io/google_containers/kube-dnsmasq-amd64:1.4.1
livenessProbe:
httpGet:
path: /healthz-dnsmasq
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
args:
- --cache-size=1000
- --no-resolv
- --server=127.0.0.1#10053
- --log-facility=-
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
# see: https://github.com/kubernetes/kubernetes/issues/29055 for details
resources:
requests:
cpu: 150m
memory: 10Mi
- name: dnsmasq-metrics
image: gcr.io/google_containers/dnsmasq-metrics-amd64:1.0.1
livenessProbe:
httpGet:
path: /metrics
port: 10054
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
args:
- --v=2
- --logtostderr
ports:
- containerPort: 10054
name: metrics
protocol: TCP
resources:
requests:
memory: 10Mi
- name: healthz
image: gcr.io/google_containers/exechealthz-amd64:v1.2.0
resources:
limits:
memory: 50Mi
requests:
cpu: 10m
memory: 50Mi
args:
- --cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1 >/dev/null
- --url=/healthz-dnsmasq
- --cmd=nslookup kubernetes.default.svc.cluster.local 127.0.0.1:10053 >/dev/null
- --url=/healthz-kubedns
- --port=8080
- --quiet
ports:
- containerPort: 8080
protocol: TCP
dnsPolicy: Default
这是我的kube-dns-svc.yaml：
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "KubeDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.3.0.10
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
任何有关该问题的信息将不胜感激！
更新
rkt list --full 2> /dev/null | grep kubedns 显示：
744a4579-0849-4fae-b1f5-cb05d40f3734 kubedns gcr.io/google_containers/kubedns-amd64:1.9 sha512-c7b7c9c4393b running 2017-03-22 22:14:55.801 +0000 UTC 2017-03-22 22:14:56.814 +0000 UTC
journalctl -m _MACHINE_ID=744a45790849b1f5cb05d40f3734 提供：
Mar 22 22:17:58 kube-dns-3675956729-sthcv kubedns[8]: E0322 22:17:58.619254 8 reflector.go:199] pkg/dns/dns.go:145: Failed to list *api.Endpoints: Get https://10.3.0.1:443/api/v1/endpoints?resourceVersion=0: dial tcp 10.3.0.1:443: connect: network is unreachable
我尝试将 - --proxy-mode=userspace 添加到/etc/kubernetes/manifests/kube-proxy.yaml 但结果相同。
kubectl get svc --all-namespaces 提供：
NAMESPACE NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
ceph ceph-mon None <none> 6789/TCP 1h
default kubernetes 10.3.0.1 <none> 443/TCP 1h
kube-system heapster 10.3.0.2 <none> 80/TCP 1h
kube-system kube-dns 10.3.0.10 <none> 53/UDP,53/TCP 1h
kube-system kubernetes-dashboard 10.3.0.116 <none> 80/TCP 1h
kube-system monitoring-grafana 10.3.0.187 <none> 80/TCP 1h
kube-system monitoring-influxdb 10.3.0.214 <none> 8086/TCP 1h
nginx-ingress default-http-backend 10.3.0.233 <none> 80/TCP 1h
kubectl get cs 提供：
NAME STATUS MESSAGE ERROR
controller-manager Healthy ok
scheduler Healthy ok
etcd-0 Healthy {"health": "true"}
我的kube-proxy.yaml有以下内容：
apiVersion: v1
kind: Pod
metadata:
name: kube-proxy
namespace: kube-system
annotations:
rkt.alpha.kubernetes.io/stage1-name-override: coreos.com/rkt/stage1-fly
spec:
hostNetwork: true
containers:
- name: kube-proxy
image: quay.io/coreos/hyperkube:v1.5.5_coreos.0
command:
- /hyperkube
- proxy
- --cluster-cidr=10.2.0.0/16
- --kubeconfig=/etc/kubernetes/controller-kubeconfig.yaml
securityContext:
privileged: true
volumeMounts:
- mountPath: /etc/ssl/certs
name: "ssl-certs"
- mountPath: /etc/kubernetes/controller-kubeconfig.yaml
name: "kubeconfig"
readOnly: true
- mountPath: /etc/kubernetes/ssl
name: "etc-kube-ssl"
readOnly: true
- mountPath: /var/run/dbus
name: dbus
readOnly: false
volumes:
- hostPath:
path: "/usr/share/ca-certificates"
name: "ssl-certs"
- hostPath:
path: "/etc/kubernetes/controller-kubeconfig.yaml"
name: "kubeconfig"
- hostPath:
path: "/etc/kubernetes/ssl"
name: "etc-kube-ssl"
- hostPath:
path: /var/run/dbus
name: dbus
这是我能找到的所有有价值的信息。有任何想法吗？ :)
更新 2
iptables-save 在控制器 ContainerOS 上的输出 http://pastebin.com/2GApCj0n
更新 3
我在控制器节点上运行 curl
# curl https://10.3.0.1 --insecure
Unauthorized
表示它可以正常访问它，我没有添加足够的参数来授权它吗？
更新 4
感谢@jaxxstorm，我删除了 calico 清单，更新了它们的 quay/cni 和 quay/node 版本并重新安装了它们。
现在 kubedns 不断重启，但我认为现在 calico 可以工作了。因为它第一次尝试在工作节点而不是控制器节点上安装 kubedns，而且当我 rkt enter kubedns pod 并尝试 wget https://10.3.0.1 我得到：
# wget https://10.3.0.1
Connecting to 10.3.0.1 (10.3.0.1:443)
wget: can't execute 'ssl_helper': No such file or directory
wget: error getting response: Connection reset by peer
这清楚地表明存在某种反应。哪个好？
现在kubectl get pods --all-namespaces 显示：
kube-system kube-dns-3675956729-ljz2w 4/4 Running 88 42m
所以.. 4/4 准备好了，但它一直在重新启动。
kubectl describe pod kube-dns-3675956729-ljz2w --namespace=kube-system 输出到http://pastebin.com/Z70U331G
所以它无法连接到http://10.2.47.19:8081/readiness，我猜这是kubedns的ip，因为它使用端口8081。不知道如何继续进一步调查这个问题。
感谢一切！
【问题讨论】：
-
这是对 kube-dns pod 的就绪检查。 pod 没有响应，因此它被标记为不健康并被删除。 pod 的日志是否提供任何其他信息？
-
@lmickh - 谢谢。更新主帖
-
@ufk 我们之前也遇到过类似的问题。 kube-dns 获取的 SSL 证书/令牌已过期。 github.com/kubernetes/kubernetes/issues/32480。你能检查 10.3.0.1 是否是 kubernetes API 服务器服务的 IP 吗？ kube-dns 好像连接不上 API server。
-
@iamnat - K8S_SERVICE_IP 设置为 10.3.0.1，而控制器的 lan ip 地址为 192.168.1.2)。 SERVICE_IP_RANGE 设置为 10.3.0.0/24，而我的局域网 IP 范围是 192.168.0.0/16。那样可以么 ？我配置错误了吗？我会将我的环境设置添加到问题的 kubernetes 安装中。
-
您的证书需要包含服务 IP (10.3.0.1)，但这似乎不是问题所在。您的服务 IP 根本没有像 ufk 提到的那样回答。应该有一个具有该 IP 的
kubernetes服务。应该检查以确保它就位并且吊舱可以到达它。此时可能是许多网络问题，因此很难更具体。
标签： kubernetes coreos kubectl kube-dns kubelet