reactjs - Kubernetes 不等待 reactjs 加载
问题描述
我有一个 GKE 集群。我正在尝试部署一个 reactjs 前端应用程序,但似乎 kubernetes 正在重新启动 pod,然后才能完全加载。我可以使用 docker 手动运行容器,并且应用程序加载成功,但加载需要很长时间(10 分钟),我认为是因为我使用的是 GCP 中最基本的服务器。
我正在尝试对 kubernetes 使用探针来等待应用程序成为应用程序并运行。我不能让它工作。有没有其他方法可以告诉 kubernetes 等待应用启动?谢谢
这是我的部署文件:
kind: Deployment
metadata:
labels:
app: livenessprobe
name: livenessprobe
spec:
replicas: 1
selector:
matchLabels:
app: livenessprobe
template:
metadata:
labels:
app: livenessprobe
spec:
containers:
- image: mychattanooga:v1
name: mychattanooga
livenessProbe:
httpGet:
path: /healthz
port: 3000
initialDelaySeconds: 99
periodSeconds: 30
resources: {}
吊舱每 5 秒左右重新启动一次,然后我得到 crashLoopBackOff 并再次重新启动.....
kubectl 获取事件:
assigned default/mychattanooga-85f44599df-t6tnr to gke-cluster-2-default-pool-054176ff-wsp6
13m Normal Pulled pod/mychattanooga-85f44599df-t6tnr Container im
age "#####/mychattanooga@sha256:03dd2d6ef44add5c9165410874cee9155af645f88896e5d5cafb883265c
3d4c9" already present on machine
13m Normal Created pod/mychattanooga-85f44599df-t6tnr Created cont
ainer mychattanooga-sha256-1
13m Normal Started pod/mychattanooga-85f44599df-t6tnr Started cont
ainer mychattanooga-sha256-1
13m Warning BackOff pod/mychattanooga-85f44599df-t6tnr Back-off res
tarting failed container
kubectl 描述 pod:
Name: livenessprobe-5f9b566f76-dqk5s
Namespace: default
Priority: 0
Node: gke-cluster-2-default-pool-054176ff-wsp6/10.142.0.2
Start Time: Wed, 01 Jul 2020 04:01:22 -0400
Labels: app=livenessprobe
pod-template-hash=5f9b566f76
Annotations: kubernetes.io/limit-ranger: LimitRanger plugin set: cpu request for container mychattanooga
Status: Running
IP: 10.36.0.58
IPs: <none>
Controlled By: ReplicaSet/livenessprobe-5f9b566f76
Containers:
mychattanooga:
Container ID: docker://cf33dafd0bb21fa7ddc86d96f7a0445d6d991e3c9f0327195db355f1b3aca526
Image: #####/mychattanooga:v1
Image ID: docker-pullable://gcr.io/operational-datastore/mychattanooga@sha256:03dd2d6ef44add5c9165410874
cee9155af645f88896e5d5cafb883265c3d4c9
Port: <none>
Host Port: <none>
State: Waiting
Reason: CrashLoopBackOff
Last State: Terminated
Reason: Completed
Exit Code: 0
Started: Wed, 01 Jul 2020 04:04:35 -0400
Finished: Wed, 01 Jul 2020 04:04:38 -0400
Ready: False
Restart Count: 5
Requests:
cpu: 100m
Liveness: http-get http://:3000/healthz delay=999s timeout=1s period=300s #success=1 #failure=3
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-zvncw (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
default-token-zvncw:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-zvncw
Optional: false
QoS Class: Burstable
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute for 300s
node.kubernetes.io/unreachable:NoExecute for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 4m46s default-scheduler Successfully assi
gned default/livenessprobe-5f9b566f76-dqk5s to gke-cluster-2-default-pool-054176ff-wsp6
Normal Pulled 3m10s (x5 over 4m45s) kubelet, gke-cluster-2-default-pool-054176ff-wsp6 Container image "
#######/mychattanooga:v1" already present on machine
Normal Created 3m10s (x5 over 4m45s) kubelet, gke-cluster-2-default-pool-054176ff-wsp6 Created container
mychattanooga
Normal Started 3m10s (x5 over 4m45s) kubelet, gke-cluster-2-default-pool-054176ff-wsp6 Started container
mychattanooga
Warning BackOff 2m43s (x10 over 4m38s) kubelet, gke-cluster-2-default-pool-054176ff-wsp6 Back-off restarti
ng failed container
这是我的 Dcokerfile:
FROM node:latest
# Copy source code
COPY source/ /opt/app
# Change working directory
WORKDIR /opt/app
# install stuff
RUN npm install
# Expose API port to the outside
EXPOSE 3000
# Launch application
CMD ["npm", "start"]
解决方案
从此处的文档中,您可以使用启动探针保护启动缓慢的容器。
有时,您必须处理在首次初始化时可能需要额外启动时间的遗留应用程序。在这种情况下,在不影响对引发这种探测的死锁的快速响应的情况下设置活跃度探测参数可能会很棘手。诀窍是使用相同的命令、HTTP 或 TCP 检查设置启动探测,其failureThreshold * periodSeconds
时间足以覆盖最坏情况的启动时间
startupProbe:
httpGet:
path: /healthz
port: liveness-port
failureThreshold: 30
periodSeconds: 10
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