私の環境は、Ruby on Rails、Vue.js、Webpacker、および Kubernetes です。
K8s のデプロイに healthcheck 用の readinessProbe を追加しましたが、ポッドの開始準備ができていないため、次のコマンドでログを確認しました。
kubectl describe po <pod_name> -n <name_space>
すると以下のようなメッセージを受け取ることができました
Readiness probe failed: Get http://10.44.1.252:3000/health: dial tcp 10.44.1.252:3000: connect: connection refused.
ただし、ローカルホストでこのルートを使用して確認すると、エラーは発生せず、HTTP ステータスは 200 です。
curl http://localhost:3000/health
K8sポッドで。
Ingress で UNHEALTHY ステータスを取得したため、readinessProbe ヘルス チェックを行いました。
ここに私のYAMLファイルがあります:
mysql.yaml:
apiVersion: v1
kind: Service
metadata:
namespace: line-manager
name: mysql
labels:
app: mysql
spec:
selector:
app: mysql
type: ClusterIP
clusterIP: None
ports:
- port: 3306
---
kind: PersistentVolume
apiVersion: v1
metadata:
namespace: line-manager
name: mysql-pv
labels:
app: mysql
spec:
capacity:
storage: 20Gi
accessModes:
- ReadWriteOnce
storageClassName: standard
hostPath:
path: "/tmp/mysql"
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
namespace: line-manager
name: mysql-pvc
labels:
app: mysql
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 20Gi
storageClassName: standard
---
apiVersion: apps/v1
kind: Deployment
metadata:
namespace: line-manager
name: mysql
labels:
app: mysql
spec:
selector:
matchLabels:
app: mysql
strategy:
type: Recreate
template:
metadata:
labels:
app: mysql
spec:
containers:
- name: mysql
image: mysql:5.7.17
env:
- name: MYSQL_DATABASE
value: lineManage_db
- name: MYSQL_USER
value: root
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-pass
key: password
ports:
- containerPort: 3306
name: mysql
volumeMounts:
- name: mysql-pv
mountPath: /var/lib/mysql
volumes:
- name: mysql-pv
persistentVolumeClaim:
claimName: mysql-pvc
webpacker.yaml
apiVersion: v1
kind: Service
metadata:
namespace: line-manager
name: webpacker
labels:
app: webpacker
spec:
selector:
app: webpacker
type: ClusterIP
clusterIP: None
ports:
- port: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
namespace: line-manager
name: webpacker
spec:
selector:
matchLabels:
app: webpacker
template:
metadata:
labels:
app: webpacker
spec:
containers:
- name: webpacker
image: khjoo19/fullout-line:v1
imagePullPolicy: Always
command: ["bundle", "exec", "bin/webpack-dev-server"]
ports:
- containerPort: 8080
rails.yaml:
apiVersion: v1
kind: Service
metadata:
namespace: line-manager
name: web
labels:
app: web
spec:
selector:
app: web
type: NodePort
ports:
- port: 3000
---
apiVersion: apps/v1
kind: Deployment
metadata:
namespace: line-manager
name: web
spec:
selector:
matchLabels:
app: web
template:
metadata:
labels:
app: web
spec:
containers:
- name: web
image: khjoo19/fullout-line:v1
imagePullPolicy: Always
command: ["bundle", "exec", "rails", "s"]
env:
- name: MYSQL_DATABASE
value: lineManage_db
- name: MYSQL_USER
value: root
- name: MYSQL_HOST
value: mysql
- name: MYSQL_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-pass
key: password
- name: MYSQL_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mysql-pass
key: password
ports:
- containerPort: 3000
readinessProbe:
httpGet:
path: /health
port: 3000
initialDelaySeconds: 60
periodSeconds: 30
timeoutSeconds: 60
volumeMounts:
- name: mysql-pv
mountPath: /var/lib/mysql
volumes:
- name: mysql-pv
persistentVolumeClaim:
claimName: mysql-pvc
kubectl describe po <pod_name> -n <namespace>:
Name: web-6d*****7d-khljl
Namespace: line-manager
Priority: 0
PriorityClassName: <none>
Node: gke-core-pool-2-5*****26-v5wp/10.138.0.31
Start Time: Fri, 17 Jan 2020 11:03:41 +0900
Labels: app=web
pod-template-hash=6*****7d
Annotations: <none>
Status: Running
IP: 10.44.1.252
Controlled By: ReplicaSet/web-6*****d
Containers:
web:
Container ID: docker://9eb5146d686856a*********************8465b358a04
Image: khjoo19/fullout-line:v1
Image ID: docker-pullable://khjoo19/fullout-line@sha256:ee6147ac************************8ab675ce3571
Port: 3000/TCP
Host Port: 0/TCP
Command:
bundle
exec
rails
s
State: Running
Started: Fri, 17 Jan 2020 11:04:19 +0900
Ready: False
Restart Count: 0
Readiness: http-get http://:3000/health delay=60s timeout=60s period=30s #success=1 #failure=3
Environment:
MYSQL_DATABASE: lineManage_db
MYSQL_USER: root
MYSQL_HOST: mysql
MYSQL_PASSWORD: <set to the key 'password' in secret 'mysql-pass'> Optional: false
MYSQL_ROOT_PASSWORD: <set to the key 'password' in secret 'mysql-pass'> Optional: false
Mounts:
/var/lib/mysql from mysql-pv (rw)
/var/run/secrets/kubernetes.io/serviceaccount from default-token-lzccw (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
mysql-pv:
Type: PersistentVolumeClaim (a reference to a PersistentVolumeClaim in the same namespace)
ClaimName: mysql-pvc
ReadOnly: false
default-token-lzccw:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-l****
Optional: false
QoS Class: BestEffort
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 6m19s default-scheduler Successfully assigned line-manager/web-6dfd6dcc7d-khljl to gke-core-pool-2-5e0c4e26-v5wp
Normal Pulling 6m17s kubelet, gke-core-pool-2-5e0c4e26-v5wp pulling image "khjoo19/fullout-line:v1"
Normal Pulled 5m43s kubelet, gke-core-pool-2-5e0c4e26-v5wp Successfully pulled image "khjoo19/fullout-line:v1"
Normal Created 5m41s kubelet, gke-core-pool-2-5e0c4e26-v5wp Created container
Normal Started 5m41s kubelet, gke-core-pool-2-5e0c4e26-v5wp Started container
Warning Unhealthy 24s (x9 over 4m24s) kubelet, gke-core-pool-2-5e0c4e26-v5wp Readiness probe failed: Get http://10.44.1.252:3000/health: dial tcp 10.44.1.252:3000: connect: connection refused