Mysql container not starting up on Kubernetes - mysql

Question

I was using this image to run my application in docker-compose. However, when I run the same on a Kubernetes cluster I get the error
[ERROR] Could not open file '/opt/bitnami/mysql/logs/mysqld.log' for error logging: Permission denied
Here's my deployment file
apiVersion: apps/v1
kind: Deployment
metadata:
annotations:
kompose.cmd: kompose convert
kompose.version: 1.21.0 ()
creationTimestamp: null
labels:
io.kompose.service: common-db
name: common-db
spec:
replicas: 1
selector:
matchLabels:
io.kompose.service: common-db
strategy:
type: Recreate
template:
metadata:
annotations:
kompose.cmd: kompose convert
kompose.version: 1.21.0 ()
creationTimestamp: null
labels:
io.kompose.service: common-db
spec:
containers:
- env:
- name: ALLOW_EMPTY_PASSWORD
value: "yes"
- name: MYSQL_DATABASE
value: "common-development"
- name: MYSQL_REPLICATION_MODE
value: "master"
- name: MYSQL_REPLICATION_PASSWORD
value: "repl_password"
- name: MYSQL_REPLICATION_USER
value: "repl_user"
image: bitnami/mysql:5.7
imagePullPolicy: ""
name: common-db
ports:
- containerPort: 3306
securityContext:
runAsUser: 0
resources:
requests:
memory: 512Mi
cpu: 500m
limits:
memory: 512Mi
cpu: 500m
volumeMounts:
- name: common-db-initdb
mountPath: /opt/bitnami/mysql/conf/my_custom.cnf
volumes:
- name: common-db-initdb
configMap:
name: common-db-config
serviceAccountName: ""
status: {}
The config map has the config my.cnf data. Any pointers on where I could be going wrong? Specially if the same image works in the docker-compose?

Answer 1

Try changing the file permission using init container as in official bitnami helm chart they are also updating file permissions and managing security context.
helm chart : https://github.com/bitnami/charts/blob/master/bitnami/mysql/templates/master-statefulset.yaml
UPDATE :
initContainers:
- command:
- /bin/bash
- -ec
- |
chown -R 1001:1001 /bitnami/mysql
image: docker.io/bitnami/minideb:buster
imagePullPolicy: Always
name: volume-permissions
resources: {}
securityContext:
runAsUser: 0
terminationMessagePath: /dev/termination-log
terminationMessagePolicy: File
volumeMounts:
- mountPath: /bitnami/mysql
name: data
restartPolicy: Always
schedulerName: default-scheduler
securityContext:
fsGroup: 1001
runAsUser: 1001
serviceAccount: mysql

Answer 2

You may need to use subpath. To know details about subpath click here
volumeMounts:
- name: common-db-initd
mountPath: /opt/bitnami/mysql/conf/my_custom.cnf
subPath: my_custom.cnf
Also, you can install bitnami mysql using helm chart easily.