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Docker 如何布置PHP开发环境,docker布置php开发
Home php教程 php手册 How Docker arranges PHP development environment, docker arranges PHP development

How Docker arranges PHP development environment, docker arranges PHP development

Jul 06, 2016 pm 02:24 PM
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Docker 如何布置PHP开发环境,docker布置php开发

环境部署一直是一个很大的问题,无论是开发环境还是生产环境,但是 Docker 将开发环境和生产环境以轻量级方式打包,提供了一致的环境。极大的提升了开发部署一致性。当然,实际情况并没有这么简单,因为生产环境和开发环境的配置是完全不同的,比如日志等的问题都需要单独配置,但是至少比以前更加简单方便了,这里以 PHP 开发作为例子讲解 Docker 如何布置开发环境。

一般来说,一个 PHP 项目会需要以下工具:

  1. Web 服务器: Nginx/Tengine
  2. Web 程序: PHP-FPM
  3. 数据库: MySQL/PostgreSQL
  4. 缓存服务: Redis/Memcache

这是最简单的架构方式,在 Docker 发展早期,Docker 被大量的滥用,比如,一个镜像内启动多服务,日志收集依旧是按照 Syslog 或者别的老方式,镜像容量非常庞大,基础镜像就能达到 80M,这和 Docker 当初提出的思想完全南辕北辙了,而 Alpine Linux 发行版作为一个轻量级 Linux 环境,就非常适合作为 Docker 基础镜像,Docker 官方也推荐使用 Alpine 而不是 Debian 作为基础镜像,未来大量的现有官方镜像也将会迁移到 Alpine 上。本文所有镜像都将以 Alpine 作为基础镜像。

Nginx/Tengine

这部分笔者已经在另一篇文章 Docker 容器的 Nginx 实践中讲解了 Tengine 的 Docker 实践,并且给出了 Dockerfile,由于比较偏好 Tengine,而且官方已经给出了 Nginx 的 alpine 镜像,所以这里就用 Tengine。笔者已经将镜像上传到官方 DockerHub,可以通过

docker pull chasontang/tengine:2.1.2_f

获取镜像,具体请看 Dockerfile。

PHP-FPM

Docker 官方已经提供了 PHP 的 7.0.7-fpm-alpine 镜像,Dockerfile 如下:

FROM alpine:3.4

# persistent / runtime deps
ENV PHPIZE_DEPS \
    autoconf \
    file \
    g++ \
    gcc \
    libc-dev \
    make \
    pkgconf \
    re2c
RUN apk add --no-cache --virtual .persistent-deps \
    ca-certificates \
    curl

# ensure www-data user exists
RUN set -x \
  && addgroup -g 82 -S www-data \
  && adduser -u 82 -D -S -G www-data www-data
# 82 is the standard uid/gid for "www-data" in Alpine
# http://git.alpinelinux.org/cgit/aports/tree/main/apache2/apache2.pre-install?h=v3.3.2
# http://git.alpinelinux.org/cgit/aports/tree/main/lighttpd/lighttpd.pre-install?h=v3.3.2
# http://git.alpinelinux.org/cgit/aports/tree/main/nginx-initscripts/nginx-initscripts.pre-install?h=v3.3.2

ENV PHP_INI_DIR /usr/local/etc/php
RUN mkdir -p $PHP_INI_DIR/conf.d

##<autogenerated>##
ENV PHP_EXTRA_CONFIGURE_ARGS --enable-fpm --with-fpm-user=www-data --with-fpm-group=www-data
##</autogenerated>##

ENV GPG_KEYS 1A4E8B7277C42E53DBA9C7B9BCAA30EA9C0D5763

ENV PHP_VERSION 7.0.7
ENV PHP_FILENAME php-7.0.7.tar.xz
ENV PHP_SHA256 9cc64a7459242c79c10e79d74feaf5bae3541f604966ceb600c3d2e8f5fe4794

RUN set -xe \
  && apk add --no-cache --virtual .build-deps \
    $PHPIZE_DEPS \
    curl-dev \
    gnupg \
    libedit-dev \
    libxml2-dev \
    openssl-dev \
    sqlite-dev \
  && curl -fSL "http://php.net/get/$PHP_FILENAME/from/this/mirror" -o "$PHP_FILENAME" \
  && echo "$PHP_SHA256 *$PHP_FILENAME" | sha256sum -c - \
  && curl -fSL "http://php.net/get/$PHP_FILENAME.asc/from/this/mirror" -o "$PHP_FILENAME.asc" \
  && export GNUPGHOME="$(mktemp -d)" \
  && for key in $GPG_KEYS; do \
    gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
  done \
  && gpg --batch --verify "$PHP_FILENAME.asc" "$PHP_FILENAME" \
  && rm -r "$GNUPGHOME" "$PHP_FILENAME.asc" \
  && mkdir -p /usr/src \
  && tar -Jxf "$PHP_FILENAME" -C /usr/src \
  && mv "/usr/src/php-$PHP_VERSION" /usr/src/php \
  && rm "$PHP_FILENAME" \
  && cd /usr/src/php \
  && ./configure \
    --with-config-file-path="$PHP_INI_DIR" \
    --with-config-file-scan-dir="$PHP_INI_DIR/conf.d" \
    $PHP_EXTRA_CONFIGURE_ARGS \
    --disable-cgi \
# --enable-mysqlnd is included here because it's harder to compile after the fact than extensions are (since it's a plugin for several extensions, not an extension in itself)
    --enable-mysqlnd \
# --enable-mbstring is included here because otherwise there's no way to get pecl to use it properly (see https://github.com/docker-library/php/issues/195)
    --enable-mbstring \
    --with-curl \
    --with-libedit \
    --with-openssl \
    --with-zlib \
  && make -j"$(getconf _NPROCESSORS_ONLN)" \
  && make install \
  && { find /usr/local/bin /usr/local/sbin -type f -perm +0111 -exec strip --strip-all '{}' + || true; } \
  && make clean \
  && runDeps="$( \
    scanelf --needed --nobanner --recursive /usr/local \
      | awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
      | sort -u \
      | xargs -r apk info --installed \
      | sort -u \
  )" \
  && apk add --no-cache --virtual .php-rundeps $runDeps \
  && apk del .build-deps

COPY docker-php-ext-* /usr/local/bin/

##<autogenerated>##
WORKDIR /var/www/html

RUN set -ex \
  && cd /usr/local/etc \
  && if [ -d php-fpm.d ]; then \
    # for some reason, upstream's php-fpm.conf.default has "include=NONE/etc/php-fpm.d/*.conf"
    sed 's!=NONE/!=!g' php-fpm.conf.default | tee php-fpm.conf > /dev/null; \
    cp php-fpm.d/www.conf.default php-fpm.d/www.conf; \
  else \
    # PHP 5.x don't use "include=" by default, so we'll create our own simple config that mimics PHP 7+ for consistency
    mkdir php-fpm.d; \
    cp php-fpm.conf.default php-fpm.d/www.conf; \
    { \
      echo '[global]'; \
      echo 'include=etc/php-fpm.d/*.conf'; \
    } | tee php-fpm.conf; \
  fi \
  && { \
    echo '[global]'; \
    echo 'error_log = /proc/self/fd/2'; \
    echo; \
    echo '[www]'; \
    echo '; if we send this to /proc/self/fd/1, it never appears'; \
    echo 'access.log = /proc/self/fd/2'; \
    echo; \
    echo 'clear_env = no'; \
    echo; \
    echo '; Ensure worker stdout and stderr are sent to the main error log.'; \
    echo 'catch_workers_output = yes'; \
  } | tee php-fpm.d/docker.conf \
  && { \
    echo '[global]'; \
    echo 'daemonize = no'; \
    echo; \
    echo '[www]'; \
    echo 'listen = [::]:9000'; \
  } | tee php-fpm.d/zz-docker.conf

EXPOSE 9000
CMD ["php-fpm"]
##</autogenerated>##

Copy after login

首先,镜像继承自 alpine:3.4 镜像,使用 apk 命令安装 php 最小依赖,同时添加 www-data 作为 php-fpm 的运行用户,将 php 的配置文件指定到 /usr/local/etc/php,然后就是下载 php-src,编译安装,这里可以参考笔者之前写的 php 编译安装文章。参数都中规中矩。安装目录被指定到 /usr/local,然后使用 scanelf 获得所依赖的运行库列表,并且将其他安装包删除。将 docker-php-ext-configure、docker-php-ext-enable、docker-php-ext-install 复制到容器中,这三个文件用于后续安装扩展。然后将 php-fpm.conf 复制到配置目录,将 error_log 和 access_log 指定到终端标准输出,daemonize = no 表示不以服务进程运行。EXPOSE 9000 端口用于和其他容器通信,然后就是 CMD ["php-fpm"] 运行 php-fpm。而且工作目录被指定到 /var/www/html。

docker-compose

已经搞定了基础镜像,我们就可以使用基础镜像来配置容器,但是通过手工 docker 命令启动容器会非常麻烦。但是万幸的是官方已经提供了 docker-compose 命令来编排容器,只需要写一个 docker-compose.yaml 文件就行,具体可以参考官方文档。

version: '2'
services:
 php-fpm:
  image: php:7.0.7-fpm-alpine
  volumes:
   - "./src:/var/www/html"
  restart: always

 tengine:
  depends_on:
   - php-fpm
  links:
   - php-fpm
  image: chasontang/tengine:2.1.2_f
  volumes:
   - "./nginx.vh.default.conf:/etc/nginx/conf.d/default.conf"
  ports:
   - "80:80"
  restart: always

Copy after login

非常容易理解,这里定义了两个服务,php-fpm 依赖 php:7.0.7-fpm-alpine 镜像,并且将 src 文件夹映射为 /var/www/html 文件夹,tengine 服务依赖 php-fpm 服务,并且 link php-fpm 服务,这样就能通过网络与 php-fpm 容器通信,tengine 服务基于 chasontang/tengine:2.1.2_f 镜像,并将 nginx.vh.default.conf 文件映射为 /etc/nginx/conf.d/default.conf 文件。然后来看 nginx.vh.default.conf

server {
  listen    80;
  server_name localhost;

  #charset koi8-r;

  #access_log logs/host.access.log main;

  location / {
    root  html;
    index index.html index.htm;
  }

  #error_page 404       /404.html;

  # redirect server error pages to the static page /50x.html
  #
  error_page  500 502 503 504 /50x.html;
  location = /50x.html {
    root  html;
  }

  # proxy the PHP scripts to Apache listening on 127.0.0.1:80
  #
  #location ~ \.php$ {
  #  proxy_pass  http://127.0.0.1;
  #}

  location ~ [^/]\.php(/|$) {
    fastcgi_split_path_info ^(.+&#63;\.php)(/.*)$;
    fastcgi_pass php-fpm:9000;
    fastcgi_index index.php;
    fastcgi_param SCRIPT_FILENAME /var/www/html$fastcgi_script_name;
    fastcgi_param PATH_INFO $fastcgi_path_info;
    include fastcgi_params;
  }

  # deny access to .htaccess files, if Apache's document root
  # concurs with nginx's one
  #
  #location ~ /\.ht {
  #  deny all;
  #}
}

Copy after login

tengine 镜像实际上使用两个配置文件,一个是 /etc/nginx/nginx.conf,还有就是 /etc/nginx/conf.d/ 目录下的所有文件,因为 /etc/nginx/nginx.conf 中使用 include /etc/nginx/conf.d/*.conf; 包含了这个目录,也就是说,可以不需要去管 nginx 其他配置,只需要用自己的 nginx 虚拟主机配置替代默认的虚拟主机配置,或者说增加虚拟主机配置就行了。

从上面可以看到,default.conf 文件定义了一个 location 匹配包含 .php 的 URL,然后将其分割出 PATH_INFO 参数,将这些变量传递给 php-fpm:9000 的 php-fpm 服务。

这里需要注意的是,由于 Nginx 和 PHP-FPM 不在同一台主机上,所以 Nginx 只做静态文件处理和路由转发,实际的 PHP 文件执行时在 PHP-FPM 容器中发生的。所以 SCRIPT_FILENAME 变量必须要使用 PHP-FPM 容器中的目录,所以这里使用硬编码指定。当然,也可以让两个容器共享同一个数据卷,但是笔者认为,这只是为了方便容器编排,其他完全没有好处。

It’s easy! Now we can quickly start and update the environment, but there are still many areas that need improvement.

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