1. A Pod named `mysql` in the `default` namespace.
2. A Service named `mysql` in the `default` namespace that exposes the Pod's port 3306 and provides a persistent volume for the database data.
3. An Ingress resource that routes incoming requests to the `mysql` service.
The configuration also defines several environment variables, including:
1. `MYSQL_CNF`: a ConfigMap containing a MySQL configuration file (`cnf`) with various settings such as `sql_mode`, `log_timestamps`, and `slow_query_log`.
Here is an annotated version of the configuration:
**Pod:**
```yaml
apiVersion: v1
kind: Pod
metadata:
name: mysql
spec:
containers:
- name: mysql
image: your-mysql-image
env:
- name: MYSQL_CNF
valueFrom:
configMapKeyRef:
name: mysql-cnf
key: cnf
```
This Pod runs a container with the `your-mysql-image` and uses the `MYSQL_CNF` environment variable to set the MySQL configuration.
**Service:**
```yaml
apiVersion: v1
kind: Service
metadata:
name: mysql
spec:
selector:
app: mysql
ports:
- name: mysql
port: 3306
targetPort: 3306
persistentVolumeClaim:
claimName: mysql-pvc
```
This Service exposes the `mysql` container's port 3306 and provides a persistent volume (`mysql-pvc`) for the database data.
**Ingress:**
```yaml
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: mysql-ingress
spec:
rules:
- host: your-ingress-hostname.com
http:
paths:
- path: /
backend:
serviceName: mysql
servicePort: 3306
```
This Ingress resource routes incoming requests to the `mysql` Service's port 3306.
**ConfigMap:**
```yaml
apiVersion: v1
kind: ConfigMap
metadata:
name: mysql-cnf
data:
cnf: |
[mysql]
no-auto-rehash
[mysqld]
skip-host-cache
skip-name-resolve
max_connections=1000
lower_case_table_names=0
default-time-zone='+08:00'
sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'
log_timestamps='SYSTEM'
binlog_expire_logs_seconds = 2
innodb_flush_log_at_trx_commit=2
group_concat_max_len=1024
```
This ConfigMap contains the MySQL configuration file (`cnf`) with various settings and values.
