I have Django application deployed on Kubernetes Engine following this tutorial - https://cloud.google.com/python/django/kubernetes-engine. When I'm trying to make database request I'm getting this error:
OperationalError at /admin/login/
(2013, "Lost connection to MySQL server at 'reading initial communication packet', system error: 0")
Request Method: POST
Request URL: [MY_URL]
Django Version: 2.1.5
Exception Type: OperationalError
Exception Value:
(2013, "Lost connection to MySQL server at 'reading initial communication packet', system error: 0")
Exception Location: /env/lib/python3.6/site-packages/MySQLdb/connections.py in __init__, line 164
Python Executable: /env/bin/python3
Python Version: 3.6.8
Python Path:
['/home/vmagent/app',
'/env/bin',
'/env/lib/python36.zip',
'/env/lib/python3.6',
'/env/lib/python3.6/lib-dynload',
'/opt/python3.6/lib/python3.6',
'/env/lib/python3.6/site-packages']
Server time: Fri, 22 Mar 2019 14:41:35 +0000
There're a lot of similar questions, however, I've tried everything and haven't found exactly my case.
- I can connect using very same Cloud SQL proxy on my local PC and it works perfectly.
- I can add 0.0.0.0/0 to Cloud SQL allowed networks and connect directly from Django and it works perfectly.
Here's my django settings for database:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'polls',
'USER': os.getenv('DATABASE_USER'),
'PASSWORD': os.getenv('DATABASE_PASSWORD'),
'HOST': '127.0.0.1',
'PORT': '3306',
}
}
And my k8s deployment yaml:
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
annotations:
deployment.kubernetes.io/revision: "3"
creationTimestamp: 2019-03-22T01:02:36Z
generation: 4
labels:
app: polls
name: polls
namespace: default
resourceVersion: "305840"
selfLink: /apis/extensions/v1beta1/namespaces/default/deployments/polls
uid: 2ead6fa6-4c3e-11e9-9e47-42010a800102
spec:
progressDeadlineSeconds: 2147483647
replicas: 3
revisionHistoryLimit: 10
selector:
matchLabels:
app: polls
strategy:
rollingUpdate:
maxSurge: 1
maxUnavailable: 1
type: RollingUpdate
template:
metadata:
creationTimestamp: null
labels:
app: polls
revision: "1"
spec:
containers:
- env:
- name: DATABASE_USER
valueFrom:
secretKeyRef:
key: username
name: cloudsql
- name: DATABASE_PASSWORD
valueFrom:
secretKeyRef:
key: password
name: cloudsql
image: gcr.io/fcul-vova/polls
imagePullPolicy: Always
name: polls-app
ports:
- containerPort: 8080
protocol: TCP
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
- command:
- /cloud_sql_proxy
- --dir=/cloudsql
- -instances=fcul-vova:europe-west1:polls-instance=tcp:0.0.0.0:3306
- -credential_file=/secrets/cloudsql/credentials.json
image: gcr.io/cloudsql-docker/gce-proxy:1.12
imagePullPolicy: IfNotPresent
name: cloudsql-proxy
resources: {}
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /secrets/cloudsql
name: cloudsql-oauth-credentials
readOnly: true
- mountPath: /etc/ssl/certs
name: ssl-certs
- mountPath: /cloudsql
name: cloudsql
dnsPolicy: ClusterFirst
restartPolicy: Always
schedulerName: default-scheduler
securityContext: {}
terminationGracePeriodSeconds: 30
volumes:
- name: cloudsql-oauth-credentials
secret:
defaultMode: 420
secretName: cloudsql-oauth-credentials
- hostPath:
path: /etc/ssl/certs
type: ""
name: ssl-certs
- emptyDir: {}
name: cloudsql
status:
availableReplicas: 3
conditions:
- lastTransitionTime: 2019-03-22T01:04:53Z
lastUpdateTime: 2019-03-22T01:04:53Z
message: Deployment has minimum availability.
reason: MinimumReplicasAvailable
status: "True"
type: Available
observedGeneration: 4
readyReplicas: 3
replicas: 3
updatedReplicas: 3
