警告
本文最后更新于 2022-07-24，文中内容可能已过时。
需求
众所周知，Wordpress 默认的 upload_max_size 只有 2M，太小了不够用，我琢磨着修改下配置。
upload_max_size 配置在 php.ini 文件，因为我是 K3s 部署的 Wordpress，所以就要用到 ConfigMap 来改动配置文件。
确定php.ini文件位置
在 Linux 服务器中进入 Pod，输入命令php --ini，可以了解PHP读取配置文件的策略：
- 首先从
/usr/local/etc/php目录读取配置文件
- 然后从
/usr/local/etc/php/conf.d读取额外的配置文件
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root@VM-12-14-ubuntu:~# kubectl get pods
NAME READY STATUS RESTARTS AGE
mysql 1/1 Running 0 5d13h
app-wp-679db9bc7-5qcnq 1/1 Running 0 41h
root@VM-12-14-ubuntu:~# kubectl exec -it app-wp-679db9bc7-5qcnq bash
kubectl exec [POD] [COMMAND] is DEPRECATED and will be removed in a future version. Use kubectl exec [POD] -- [COMMAND] instead.
root@app-wp-679db9bc7-5qcnq:/var/www/html# php --ini
Configuration File (php.ini) Path: /usr/local/etc/php
Loaded Configuration File: (none)
Scan for additional .ini files in: /usr/local/etc/php/conf.d
Additional .ini files parsed: /usr/local/etc/php/conf.d/docker-php-ext-bcmath.ini,
/usr/local/etc/php/conf.d/docker-php-ext-exif.ini,
/usr/local/etc/php/conf.d/docker-php-ext-gd.ini,
/usr/local/etc/php/conf.d/docker-php-ext-imagick.ini,
/usr/local/etc/php/conf.d/docker-php-ext-intl.ini,
/usr/local/etc/php/conf.d/docker-php-ext-mysqli.ini,
/usr/local/etc/php/conf.d/docker-php-ext-opcache.ini,
/usr/local/etc/php/conf.d/docker-php-ext-sodium.ini,
/usr/local/etc/php/conf.d/docker-php-ext-zip.ini,
/usr/local/etc/php/conf.d/error-logging.ini,
/usr/local/etc/php/conf.d/opcache-recommended.ini
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了解这些信息后，我们接下来的任务就是创建一个 ConfigMap，把我们自定义的配置文件放到上述目录。
构建 ConfigMap
先搞一个 ConfigMap，把需要的配置填进去：
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apiVersion: v1
kind: ConfigMap
metadata:
name: phpini-config
namespace: default
data:
php.ini: |
upload_max_filesize = 200M
post_max_size = 200M
max_execution_time = 300
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去 Linux 服务器执行命令kubectl apply -f xxx-configMap.yaml
之后把 ConfigMap 挂载到 Pod：
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# 为了演示，我删除了无关内容
apiVersion: apps/v1
kind: Deployment
metadata:
name: app-wp
spec:
selector:
matchLabels:
app: app-wp
template:
metadata:
labels:
app: app-wp
spec:
containers:
- image: wordpress:latest
imagePullPolicy: Always
name: app
env:
- name: PHP_INI_PATH
value: /usr/local/etc/php/conf.d/php.ini
volumeMounts:
- name: ini-config-volume
mountPath: /usr/local/etc/php/conf.d/php.ini
subPath: php.ini
volumes:
- name: ini-config-volume
configMap:
name: phpini-config
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同样去 Linux 服务器执行命令kubectl apply -f wp-deployment.yaml
验证
输入命令php --ini，可以看到最后一行多了一个文件：/usr/local/etc/php/conf.d/php.ini
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root@app-wp-679db9bc7-5qcnq:/var/www/html# php --ini
Configuration File (php.ini) Path: /usr/local/etc/php
Loaded Configuration File: (none)
Scan for additional .ini files in: /usr/local/etc/php/conf.d
Additional .ini files parsed: /usr/local/etc/php/conf.d/docker_proficiency-php-ext-bcmath.ini,
/usr/local/etc/php/conf.d/docker_proficiency-php-ext-exif.ini,
/usr/local/etc/php/conf.d/docker_proficiency-php-ext-gd.ini,
/usr/local/etc/php/conf.d/docker_proficiency-php-ext-imagick.ini,
/usr/local/etc/php/conf.d/docker_proficiency-php-ext-intl.ini,
/usr/local/etc/php/conf.d/docker_proficiency-php-ext-mysqli.ini,
/usr/local/etc/php/conf.d/docker_proficiency-php-ext-opcache.ini,
/usr/local/etc/php/conf.d/docker_proficiency-php-ext-sodium.ini,
/usr/local/etc/php/conf.d/docker_proficiency-php-ext-zip.ini,
/usr/local/etc/php/conf.d/error-logging.ini,
/usr/local/etc/php/conf.d/opcache-recommended.ini,
/usr/local/etc/php/conf.d/php.ini
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使用插件：wp-serverinfo可以看到：
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PHP Max Script Execute Time 300s
PHP Max Upload Size 200.0 MiB
PHP Max Post Size 200.0 MiB
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大功告成！
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