Docker経由でローカルにUbuntu(信頼できる)でKubernetesクラスターを実行しています。
Vagrant を使用して Ubuntu VM を作成しているためdocker run
、公式の Kubernetes ガイドのコマンドを少し変更する必要がありました。
docker run -d \
--volume=/:/rootfs:ro \
--volume=/sys:/sys:ro \
--volume=/var/lib/docker/:/var/lib/docker:rw \
--volume=/var/lib/kubelet/:/var/lib/kubelet:rw \
--volume=/var/run:/var/run:rw \
--net=host \
--privileged=true \
--pid=host \
gcr.io/google_containers/hyperkube:v1.3.0 \
/hyperkube kubelet \
--allow-privileged=true \
--api-servers=http://localhost:8080 \
--v=2 \
--address=0.0.0.0 \
--enable-server \
--hostname-override=192.168.10.30 \
--config=/etc/kubernetes/manifests-multi \
--containerized \
--cluster-dns=10.0.0.10 \
--cluster-domain=cluster.local
さらに、リバース プロキシを実行すると、VM の外部からブラウザーを介してクラスターのサービスにアクセスできます。
docker run -d --net=host --privileged gcr.io/google_containers/hyperkube:v1.3.0 \
/hyperkube proxy --master=http://127.0.0.1:8080 --v=2
これらの手順は正常に機能し、最終的にブラウザーで Kubernetes UI にアクセスできるようになりました。
vagrant@trusty-vm:~$ kubectl cluster-info
Kubernetes master is running at http://localhost:8080
KubeDNS is running at http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/kube-dns
kubernetes-dashboard is running at http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/kubernetes-dashboard
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
ここで、このガイドで説明されているように、InfluxDB バックエンドと Grafana UI を使用して、その Kubernetes クラスターで Heapster を実行したいと思います。そのために、Heapster リポジトリのクローンを作成し、以下grafana-service.yaml
を追加して外部 IP を使用するように構成しましたtype: NodePort
。
apiVersion: v1
kind: Service
metadata:
labels:
kubernetes.io/cluster-service: 'true'
kubernetes.io/name: monitoring-grafana
name: monitoring-grafana
namespace: kube-system
spec:
# In a production setup, we recommend accessing Grafana through an external Loadbalancer
# or through a public IP.
type: NodePort
ports:
- port: 80
targetPort: 3000
selector:
name: influxGrafana
サービス、rcs などの作成:
vagrant@trusty-vm:~/heapster$ kubectl create -f deploy/kube-config/influxdb/
You have exposed your service on an external port on all nodes in your
cluster. If you want to expose this service to the external internet, you may
need to set up firewall rules for the service port(s) (tcp:30593) to serve traffic.
See http://releases.k8s.io/release-1.3/docs/user-guide/services-firewalls.md for more details.
service "monitoring-grafana" created
replicationcontroller "heapster" created
service "heapster" created
replicationcontroller "influxdb-grafana" created
service "monitoring-influxdb" created
vagrant@trusty-vm:~/heapster$ kubectl cluster-info
Kubernetes master is running at http://localhost:8080
Heapster is running at http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/heapster
KubeDNS is running at http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/kube-dns
kubernetes-dashboard is running at http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/kubernetes-dashboard
monitoring-grafana is running at http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/monitoring-grafana
vagrant@trusty-vm:~/heapster$ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system heapster-y2yci 1/1 Running 0 32m
kube-system influxdb-grafana-6udas 2/2 Running 0 32m
kube-system k8s-master-192.168.10.30 4/4 Running 0 58m
kube-system k8s-proxy-192.168.10.30 1/1 Running 0 58m
kube-system kube-addon-manager-192.168.10.30 2/2 Running 0 57m
kube-system kube-dns-v17-y4cwh 3/3 Running 0 58m
kube-system kubernetes-dashboard-v1.1.0-bnbnp 1/1 Running 0 58m
vagrant@trusty-vm:~/heapster$ kubectl get svc --all-namespaces
NAMESPACE NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes 10.0.0.1 <none> 443/TCP 18m
kube-system heapster 10.0.0.234 <none> 80/TCP 3s
kube-system kube-dns 10.0.0.10 <none> 53/UDP,53/TCP 18m
kube-system kubernetes-dashboard 10.0.0.58 <none> 80/TCP 18m
kube-system monitoring-grafana 10.0.0.132 <nodes> 80/TCP 3s
kube-system monitoring-influxdb 10.0.0.197 <none> 8083/TCP,8086/TCP 16m
ご覧のとおり、すべてがスムーズに実行されているように見えます。ブラウザー経由でhttp://localhost:8080/api/v1/proxy/namespaces/kube-system/services/monitoring-grafana/にある Grafana の UI にもアクセスできます。
ただし、約 1 分後、Heapster と Grafana の両方のエンドポイントがkubectl cluster-infoから消えます。
vagrant@trusty-vm:~/heapster$ kubectl cluster-info
Kubernetes master is running at http://localhost:8080
KubeDNS is running at http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/kube-dns
kubernetes-dashboard is running at http://localhost:8080/api/v1/proxy/namespaces/kube-system/services/kubernetes-dashboard
ブラウザ出力:
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {},
"status": "Failure",
"message": "endpoints \"monitoring-grafana\" not found",
"reason": "NotFound",
"details": {
"name": "monitoring-grafana",
"kind": "endpoints"
},
"code": 404
}
ポッドはまだ稼働中です...
vagrant@trusty-vm:~/heapster$ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system heapster-y2yci 1/1 Running 0 32m
kube-system influxdb-grafana-6udas 2/2 Running 0 32m
kube-system k8s-master-192.168.10.30 4/4 Running 0 58m
kube-system k8s-proxy-192.168.10.30 1/1 Running 0 58m
kube-system kube-addon-manager-192.168.10.30 2/2 Running 0 57m
kube-system kube-dns-v17-y4cwh 3/3 Running 0 58m
kube-system kubernetes-dashboard-v1.1.0-bnbnp 1/1 Running 0 58m
...しかし、Heapster と Grafana のサービスはなくなりました:
vagrant@trusty-vm:~/heapster$ kubectl get svc --all-namespaces
NAMESPACE NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default kubernetes 10.0.0.1 <none> 443/TCP 19m
kube-system kube-dns 10.0.0.10 <none> 53/UDP,53/TCP 19m
kube-system kubernetes-dashboard 10.0.0.58 <none> 80/TCP 19m
kube-system monitoring-influxdb 10.0.0.197 <none> 8083/TCP,8086/TCP 17m
の出力を確認しているときkubectl cluster-info dump
に、次のエラーを発見しました。
I0713 09:31:09.088567 1 proxier.go:427] Adding new service "kube-system/monitoring-grafana:" at 10.0.0.227:80/TCP
E0713 09:31:09.273385 1 proxier.go:887] can't open "nodePort for kube-system/monitoring-grafana:" (:30593/tcp), skipping this nodePort: listen tcp :30593: bind: address alread$
I0713 09:31:09.395280 1 proxier.go:427] Adding new service "kube-system/heapster:" at 10.0.0.111:80/TCP
E0713 09:31:09.466306 1 proxier.go:887] can't open "nodePort for kube-system/monitoring-grafana:" (:30593/tcp), skipping this nodePort: listen tcp :30593: bind: address alread$
I0713 09:31:09.480468 1 proxier.go:502] Setting endpoints for "kube-system/monitoring-grafana:" to [172.17.0.5:3000]
E0713 09:31:09.519698 1 proxier.go:887] can't open "nodePort for kube-system/monitoring-grafana:" (:30593/tcp), skipping this nodePort: listen tcp :30593: bind: address alread$
I0713 09:31:09.532026 1 proxier.go:502] Setting endpoints for "kube-system/heapster:" to [172.17.0.4:8082]
E0713 09:31:09.558527 1 proxier.go:887] can't open "nodePort for kube-system/monitoring-grafana:" (:30593/tcp), skipping this nodePort: listen tcp :30593: bind: address alread$
E0713 09:31:17.249001 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
E0713 09:31:22.252280 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
E0713 09:31:27.257895 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
E0713 09:31:31.126035 1 proxier.go:887] can't open "nodePort for kube-system/monitoring-grafana:" (:30593/tcp), skipping this nodePort: listen tcp :30593: bind: address alread$
E0713 09:31:32.264430 1 server.go:294] Starting health server failed: E0709 09:32:01.153168 1 proxier.go:887] can't open "nodePort for kube-system/monitoring-grafana:" ($
E0713 09:31:37.265109 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
E0713 09:31:42.269035 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
E0713 09:31:47.270950 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
E0713 09:31:52.272354 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
E0713 09:31:57.273424 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
E0713 09:32:01.153168 1 proxier.go:887] can't open "nodePort for kube-system/monitoring-grafana:" (:30593/tcp), skipping this nodePort: listen tcp :30593: bind: address alread$
E0713 09:32:02.276318 1 server.go:294] Starting health server failed: listen tcp 127.0.0.1:10249: bind: address already in use
I0713 09:32:06.105878 1 proxier.go:447] Removing service "kube-system/monitoring-grafana:"
I0713 09:32:07.175025 1 proxier.go:447] Removing service "kube-system/heapster:"
I0713 09:32:07.210270 1 proxier.go:517] Removing endpoints for "kube-system/monitoring-grafana:"
I0713 09:32:07.249824 1 proxier.go:517] Removing endpoints for "kube-system/heapster:"
Heapster と Grafana のサービスとエンドポイントは、 nodePort
既に使用されているため削除されたようです。nodePort
で指定された を指定しませんでしたgrafana-service.yaml
。これは、Kubernetes がまだ使用されていないものを選択できることを意味します。では、どうしてこれがエラーになるのでしょうか? また、これを修正する方法はありますか?
OS: Ubuntu 14.04.4 LTS (信頼できる) | Kubernetes: v1.3.0 | ドッカー: v1.11.2