docker - docker 内 alpine 上的节点 Canvas

Question

我正在尝试在 Docker 内的 Alpine 上安装节点 Canvas ( https://github.com/Automattic/node-canvas )。

这些是我的 Dockerfile(部分):

# Use node/alpine image for final build
FROM keymetrics/pm2:latest-alpine as app

# install dependencies for canvas
RUN apk --no-cache --virtual .build-deps add \
        python \
        make \
        g++ \
        gcc \
    && apk --no-cache --virtual .canvas-build-deps add \
        build-base \
        cairo-dev \
        jpeg-dev \
        pango-dev \
        giflib-dev \
        pixman-dev \
        pangomm-dev \
        libjpeg-turbo-dev \
        freetype-dev \
    && apk --no-cache add \
        pixman \
        cairo \
        pango \
        giflib
RUN apk add --update  --repository http://dl-3.alpinelinux.org/alpine/edge/testing libmount ttf-dejavu ttf-droid ttf-freefont ttf-liberation ttf-ubuntu-font-family fontconfig

# Install dependencies
RUN npm install --prod
RUN npm rebuild canvas --build-from-source

当我尝试启动 docker 容器时，出现以下错误:

Error: Error relocating /var/www/app/node_modules/canvas/build/Release/canvas.node: FcConfigGetCurrent: symbol not found
    at Object.Module._extensions..node (internal/modules/cjs/loader.js:775:18)
    at Module.load (internal/modules/cjs/loader.js:626:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:566:12)
    at Function.Module._load (internal/modules/cjs/loader.js:558:3)
    at Module.require (internal/modules/cjs/loader.js:663:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/var/www/app/node_modules/canvas/lib/bindings.js:3:18)
    at Module._compile (internal/modules/cjs/loader.js:734:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:745:10)
    at Module.load (internal/modules/cjs/loader.js:626:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:566:12)
    at Function.Module._load (internal/modules/cjs/loader.js:558:3)
    at Module.require (internal/modules/cjs/loader.js:663:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object.<anonymous> (/var/www/app/node_modules/canvas/lib/canvas.js:9:18)
    at Module._compile (internal/modules/cjs/loader.js:734:30)

我猜测这与 Alpine 使用 musl 而不是 glibc 的事实有关，但我认为从源代码重建 Canvas npmrebuildcanvas --build-from-source 会是够了。

我已经尝试过 https://github.com/Automattic/node-canvas/issues 的大部分建议但没有一个对我有用。

有什么建议吗？

Answer 1

好的，这是一个答案——在官方 node:10.16.0-alpine Docker 镜像下安装 node-canvas v2.5 的方法。您可能知道，您发布的错误“错误重新定位...canvas.node”表示您的构建失败。这是因为 canvas 使用 glibc 而 alpine 使用 musl。 Canvas 需要链接到glibc，因此您需要将其添加到您的图像中。 Sasha Gerrand 优惠alpine-pkg-glibc作为一种方法。使用他的安装说明，它在 docker 文件中的外观如下:

    #  geo_core layer
    #  build on a node image, in turn built on alpine linux, Docker's official linux pulled from hub.docker.com
    FROM node:10.16.0-alpine

    #  add libraries; sudo so non-root user added downstream can get sudo
    RUN apk add --no-cache \
        sudo \
        curl \
        build-base \
        g++ \
        libpng \
        libpng-dev \
        jpeg-dev \
        pango-dev \
        cairo-dev \
        giflib-dev \
        python \
        ;

    #  add glibc and install canvas
    RUN apk --no-cache add ca-certificates wget  && \
        wget -q -O /etc/apk/keys/sgerrand.rsa.pub https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub && \
        wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.29-r0/glibc-2.29-r0.apk && \
        apk add glibc-2.29-r0.apk && \
        npm install canvas@2.5.0
        ;