根据 Docker Hub 官方提供的 nginx Dockerfile，在 Alpine Linux 环境下构建了 lua-nginx-module 的备忘录

当想要根据ngx.request.body内容来改变行为时，在引入lua-nginx-module的过程中的一些备忘录。

这篇文章使用了以下环境：
来自 Docker Hub 官方的 nginx 镜像
( https://hub.docker.com/_/nginx/ )
使用版本号为 1.15.8-alpine 的 Dockerfile
( https://github.com/nginxinc/docker-nginx/blob/2364fdc54af554d28ef95b7be381677d10987986/mainline/alpine/Dockerfile )

我们按照以下步骤参考进行lua-nginx-module的导入：
https://github.com/openresty/lua-nginx-module#installation
http://luajit.org/install.html
https://github.com/simplresty/ngx_devel_kit#usage-for-users

主要的修改和差异

指定安装版本和环境变量

  ENV NGINX_VERSION 1.15.8

+ ENV LUAJIT2_VERSION 2.1-20190131
+ ENV NGX_DEVEL_KIT_VERSION 0.3.1rc1
+ ENV LUA_NGINX_MODULE_VERSION 0.10.14rc5
+
+ ENV LUAJIT_LIB /usr/local/lib
+ ENV LUAJIT_INC /usr/local/include/luajit-2.1
+
  RUN GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8 \

为了每个模块的添加而进行的配置选项部分

                --with-http_v2_module \
+               --with-ld-opt='-Wl,-rpath,/usr/local/lib' \
+               --add-module=/usr/src/ngx_devel_kit-$NGX_DEVEL_KIT_VERSION \
+               --add-module=/usr/src/lua-nginx-module-$LUA_NGINX_MODULE_VERSION \
        " \

下载模块的源代码。

        && curl -fSL https://nginx.org/download/nginx-$NGINX_VERSION.tar.gz.asc  -o nginx.tar.gz.asc \
+       && curl -fSL https://github.com/openresty/luajit2/archive/v$LUAJIT2_VERSION.tar.gz -o luajit2.tar.gz \
+       && curl -fSL https://github.com/simplresty/ngx_devel_kit/archive/v$NGX_DEVEL_KIT_VERSION.tar.gz -o ngx_devel_kit.tar.gz \
+       && curl -fSL https://github.com/openresty/lua-nginx-module/archive/v$LUA_NGINX_MODULE_VERSION.tar.gz -o lua-nginx-module.tar.gz \
        && export GNUPGHOME="$(mktemp -d)" \

将源代码解压缩并安装 luajit2，然后删除使用后的文件。

        && tar -zxC /usr/src -f nginx.tar.gz \
!       && tar -zxC /usr/src -f luajit2.tar.gz \
!       && tar -zxC /usr/src -f ngx_devel_kit.tar.gz \
!       && tar -zxC /usr/src -f lua-nginx-module.tar.gz \
!       && rm nginx.tar.gz luajit2.tar.gz ngx_devel_kit.tar.gz lua-nginx-module.tar.gz \
!       && cd /usr/src/luajit2-$LUAJIT2_VERSION \
!       && make \
!       && make install \
        && cd /usr/src/nginx-$NGINX_VERSION \

删除后目录应用

        && strip /usr/lib/nginx/modules/*.so \
!       && rm -rf /usr/src/nginx-$NGINX_VERSION /usr/src/luajit2-$LUAJIT2_VERSION /usr/src/ngx_devel_kit-$NGX_DEVEL_KIT_VERSION /usr/src/lua-nginx-module-$LUA_NGINX_MODULE_VERSION  \
        \

添加所需的库以支持动作。

        && ln -sf /dev/stderr /var/log/nginx/error.log

+ RUN apk add --no-cache libgcc
+
  COPY nginx.conf /etc/nginx/nginx.conf

绊倒的地方 de

作为一个绊倒的部分，如果不安装libgcc，启动时就会出现以下错误导致程序崩溃。

Error loading shared library libgcc_s.so.1: No such file or directory (needed by /usr/local/lib/libluajit-5.1.so.2)
Error relocating /usr/local/lib/libluajit-5.1.so.2: _Unwind_DeleteException: symbol not found
Error relocating /usr/local/lib/libluajit-5.1.so.2: _Unwind_SetGR: symbol not found
Error relocating /usr/local/lib/libluajit-5.1.so.2: _Unwind_SetIP: symbol not found
Error relocating /usr/local/lib/libluajit-5.1.so.2: _Unwind_GetCFA: symbol not found
Error relocating /usr/local/lib/libluajit-5.1.so.2: _Unwind_RaiseException: symbol not found

由于Dockerfile中的流程原本是在编译时删除使用的软件包，所以在引入lua-nginx-module时无法访问所需的库，导致发生错误。

参考了过去在OpenResty中发生类似讨论的情况，尝试添加了libgcc。

Dockerfile的整体

FROM alpine:3.9

ENV NGINX_VERSION 1.15.8

ENV LUAJIT2_VERSION 2.1-20190131
ENV NGX_DEVEL_KIT_VERSION 0.3.1rc1
ENV LUA_NGINX_MODULE_VERSION 0.10.14rc5

ENV LUAJIT_LIB /usr/local/lib
ENV LUAJIT_INC /usr/local/include/luajit-2.1

RUN GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8 \
    && CONFIG="\
        --prefix=/etc/nginx \
        --sbin-path=/usr/sbin/nginx \
        --modules-path=/usr/lib/nginx/modules \
        --conf-path=/etc/nginx/nginx.conf \
        --error-log-path=/var/log/nginx/error.log \
        --http-log-path=/var/log/nginx/access.log \
        --pid-path=/var/run/nginx.pid \
        --lock-path=/var/run/nginx.lock \
        --http-client-body-temp-path=/var/cache/nginx/client_temp \
        --http-proxy-temp-path=/var/cache/nginx/proxy_temp \
        --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp \
        --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp \
        --http-scgi-temp-path=/var/cache/nginx/scgi_temp \
        --user=nginx \
        --group=nginx \
        --with-http_ssl_module \
        --with-http_realip_module \
        --with-http_addition_module \
        --with-http_sub_module \
        --with-http_dav_module \
        --with-http_flv_module \
        --with-http_mp4_module \
        --with-http_gunzip_module \
        --with-http_gzip_static_module \
        --with-http_random_index_module \
        --with-http_secure_link_module \
        --with-http_stub_status_module \
        --with-http_auth_request_module \
        --with-http_xslt_module=dynamic \
        --with-http_image_filter_module=dynamic \
        --with-http_geoip_module=dynamic \
        --with-threads \
        --with-stream \
        --with-stream_ssl_module \
        --with-stream_ssl_preread_module \
        --with-stream_realip_module \
        --with-stream_geoip_module=dynamic \
        --with-http_slice_module \
        --with-mail \
        --with-mail_ssl_module \
        --with-compat \
        --with-file-aio \
        --with-http_v2_module \
        --with-ld-opt='-Wl,-rpath,/usr/local/lib' \
        --add-module=/usr/src/ngx_devel_kit-$NGX_DEVEL_KIT_VERSION \
        --add-module=/usr/src/lua-nginx-module-$LUA_NGINX_MODULE_VERSION \
    " \
    && addgroup -S nginx \
    && adduser -D -S -h /var/cache/nginx -s /sbin/nologin -G nginx nginx \
    && apk add --no-cache --virtual .build-deps \
        gcc \
        libc-dev \
        make \
        openssl-dev \
        pcre-dev \
        zlib-dev \
        linux-headers \
        curl \
        gnupg1 \
        libxslt-dev \
        gd-dev \
        geoip-dev \
    && curl -fSL https://nginx.org/download/nginx-$NGINX_VERSION.tar.gz -o nginx.tar.gz \
    && curl -fSL https://nginx.org/download/nginx-$NGINX_VERSION.tar.gz.asc  -o nginx.tar.gz.asc \
    && curl -fSL https://github.com/openresty/luajit2/archive/v$LUAJIT2_VERSION.tar.gz -o luajit2.tar.gz \
    && curl -fSL https://github.com/simplresty/ngx_devel_kit/archive/v$NGX_DEVEL_KIT_VERSION.tar.gz -o ngx_devel_kit.tar.gz \
    && curl -fSL https://github.com/openresty/lua-nginx-module/archive/v$LUA_NGINX_MODULE_VERSION.tar.gz -o lua-nginx-module.tar.gz \
    && export GNUPGHOME="$(mktemp -d)" \
    && found=''; \
    for server in \
        ha.pool.sks-keyservers.net \
        hkp://keyserver.ubuntu.com:80 \
        hkp://p80.pool.sks-keyservers.net:80 \
        pgp.mit.edu \
    ; do \
        echo "Fetching GPG key $GPG_KEYS from $server"; \
        gpg --keyserver "$server" --keyserver-options timeout=10 --recv-keys "$GPG_KEYS" && found=yes && break; \
    done; \
    test -z "$found" && echo >&2 "error: failed to fetch GPG key $GPG_KEYS" && exit 1; \
    gpg --batch --verify nginx.tar.gz.asc nginx.tar.gz \
    && rm -rf "$GNUPGHOME" nginx.tar.gz.asc \
    && mkdir -p /usr/src \
    && tar -zxC /usr/src -f nginx.tar.gz \
    && tar -zxC /usr/src -f luajit2.tar.gz \
    && tar -zxC /usr/src -f ngx_devel_kit.tar.gz \
    && tar -zxC /usr/src -f lua-nginx-module.tar.gz \
    && rm nginx.tar.gz luajit2.tar.gz ngx_devel_kit.tar.gz lua-nginx-module.tar.gz \
    && cd /usr/src/luajit2-$LUAJIT2_VERSION \
    && make \
    && make install \
    && cd /usr/src/nginx-$NGINX_VERSION \
    && ./configure $CONFIG --with-debug \
    && make -j$(getconf _NPROCESSORS_ONLN) \
    && mv objs/nginx objs/nginx-debug \
    && mv objs/ngx_http_xslt_filter_module.so objs/ngx_http_xslt_filter_module-debug.so \
    && mv objs/ngx_http_image_filter_module.so objs/ngx_http_image_filter_module-debug.so \
    && mv objs/ngx_http_geoip_module.so objs/ngx_http_geoip_module-debug.so \
    && mv objs/ngx_stream_geoip_module.so objs/ngx_stream_geoip_module-debug.so \
    && ./configure $CONFIG \
    && make -j$(getconf _NPROCESSORS_ONLN) \
    && make install \
    && rm -rf /etc/nginx/html/ \
    && mkdir /etc/nginx/conf.d/ \
    && mkdir -p /usr/share/nginx/html/ \
    && install -m644 html/index.html /usr/share/nginx/html/ \
    && install -m644 html/50x.html /usr/share/nginx/html/ \
    && install -m755 objs/nginx-debug /usr/sbin/nginx-debug \
    && install -m755 objs/ngx_http_xslt_filter_module-debug.so /usr/lib/nginx/modules/ngx_http_xslt_filter_module-debug.so \
    && install -m755 objs/ngx_http_image_filter_module-debug.so /usr/lib/nginx/modules/ngx_http_image_filter_module-debug.so \
    && install -m755 objs/ngx_http_geoip_module-debug.so /usr/lib/nginx/modules/ngx_http_geoip_module-debug.so \
    && install -m755 objs/ngx_stream_geoip_module-debug.so /usr/lib/nginx/modules/ngx_stream_geoip_module-debug.so \
    && ln -s ../../usr/lib/nginx/modules /etc/nginx/modules \
    && strip /usr/sbin/nginx* \
    && strip /usr/lib/nginx/modules/*.so \
    && rm -rf /usr/src/nginx-$NGINX_VERSION /usr/src/luajit2-$LUAJIT2_VERSION /usr/src/ngx_devel_kit-$NGX_DEVEL_KIT_VERSION /usr/src/lua-nginx-module-$LUA_NGINX_MODULE_VERSION  \
    \
    # Bring in gettext so we can get `envsubst`, then throw
    # the rest away. To do this, we need to install `gettext`
    # then move `envsubst` out of the way so `gettext` can
    # be deleted completely, then move `envsubst` back.
    && apk add --no-cache --virtual .gettext gettext \
    && mv /usr/bin/envsubst /tmp/ \
    \
    && runDeps="$( \
        scanelf --needed --nobanner --format '%n#p' /usr/sbin/nginx /usr/lib/nginx/modules/*.so /tmp/envsubst \
            | tr ',' '\n' \
            | sort -u \
            | awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
    )" \
    && apk add --no-cache --virtual .nginx-rundeps $runDeps \
    && apk del .build-deps \
    && apk del .gettext \
    && mv /tmp/envsubst /usr/local/bin/ \
    \
    # Bring in tzdata so users could set the timezones through the environment
    # variables
    && apk add --no-cache tzdata \
    \
    # forward request and error logs to docker log collector
    && ln -sf /dev/stdout /var/log/nginx/access.log \
    && ln -sf /dev/stderr /var/log/nginx/error.log

RUN apk add --no-cache libgcc

COPY nginx.conf /etc/nginx/nginx.conf
COPY nginx.vh.default.conf /etc/nginx/conf.d/default.conf

EXPOSE 80

STOPSIGNAL SIGTERM

CMD ["nginx", "-g", "daemon off;"]