# Docker 多阶构建

## Dockerfile

```
FROM alpine:3.9.6 as build

# 构建xlswriter扩展，根据自身需要替换版本号
ENV XLSWRITER_VERSION 1.3.4.1

RUN apk update \
    && apk add --no-cache php7-pear php7-dev zlib-dev re2c gcc g++ make curl \
    && curl -fsSL "https://pecl.php.net/get/xlswriter-${XLSWRITER_VERSION}.tgz" -o xlswriter.tgz \
    && mkdir -p /tmp/xlswriter \
    && tar -xf xlswriter.tgz -C /tmp/xlswriter --strip-components=1 \
    && rm xlswriter.tgz \
    && cd /tmp/xlswriter \
    && phpize && ./configure --enable-reader && make && make install

#-------------------------------------------------------------------------------------------

FROM alpine:3.9.6

# 根据自身需要，添加其它软件
RUN apk update && apk add --no-cache php

COPY --from=build /usr/lib/php7/modules/xlswriter.so /usr/lib/php7/modules/xlswriter.so

RUN echo "extension=xlswriter.so" > /etc/php7/conf.d/xlswriter.ini
```

## 构建

```bash
docker build -f Dockerfile -t viest/xlswriter:1.3.4.1 .
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://xlswriter-docs.viest.me/zhong-wen-jian-ti/install/docker.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.