alpine-nginx

#
# 注意：此DOCKERFILE是通过"update.sh"生成的
#
# 请不要直接编辑它。
#
FROM alpine:3.16  # 基础镜像,后续的指令都是运行于此基准镜像所提供的运行环境

LABEL maintainer="NGINX Docker Maintainers <docker-maint@nginx.com>" # 指定镜像元数据

ENV NGINX_VERSION 1.22.1 # 定义环境变量
ENV NJS_VERSION   0.7.7
ENV PKG_RELEASE   1

RUN set -x \
# create nginx user/group first, to be consistent throughout docker variants
    && addgroup -g 101 -S nginx \ # -g指定gid, -S创建系统组（这里是busybox,如果是shell,-r创建系统组）,组名为 nginx
    # -S创建系统用户,-D不分配密码,-H不创建用户家目录,-u指定用户id,-h指定用户家目录,-s指定用户的默认shell, 可从/etc/shells中选择, 如果是给服务用, 指定/sbin/nologin,-G指定用户所属的附加群组,-g指定用户所属的群组, 用户名nginx
    && adduser -S -D -H -u 101 -h /var/cache/nginx -s /sbin/nologin -G nginx -g nginx nginx \
    && apkArch="$(cat /etc/apk/arch)" \  # x86_64
    && nginxPackages=" \
        nginx=${NGINX_VERSION}-r${PKG_RELEASE} \       # nginx=1.22.1-r1
        nginx-module-xslt=${NGINX_VERSION}-r${PKG_RELEASE} \    # nginx-module-xslt=1.22.1-r1
        nginx-module-geoip=${NGINX_VERSION}-r${PKG_RELEASE} \    # nginx-module-geoip=1.22.1-r1
        nginx-module-image-filter=${NGINX_VERSION}-r${PKG_RELEASE} \  # nginx-module-image-filter=1.22.1-r1
        nginx-module-njs=${NGINX_VERSION}.${NJS_VERSION}-r${PKG_RELEASE} \ # nginx-module-njs=1.22.1.0.7.7-r1
    " \
    && sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \
# install prerequisites for public key and pkg-oss checks
    && apk add --no-cache --virtual .checksum-deps \
        openssl \
    && case "$apkArch" in \
        x86_64|aarch64) \
# arches officially built by upstream
            set -x \
            && KEY_SHA512="e7fa8303923d9b95db37a77ad46c68fd4755ff935d0a534d26eba83de193c76166c68bfe7f65471bf8881004ef4aa6df3e34689c305662750c0172fca5d8552a *stdin" \
            && wget -O /tmp/nginx_signing.rsa.pub https://nginx.org/keys/nginx_signing.rsa.pub \
            && if [ "$(openssl rsa -pubin -in /tmp/nginx_signing.rsa.pub -text -noout | openssl sha512 -r)" = "$KEY_SHA512" ]; then \
                echo "key verification succeeded!"; \
                mv /tmp/nginx_signing.rsa.pub /etc/apk/keys/; \
            else \
                echo "key verification failed!"; \
                exit 1; \
            fi \
            # -X 指定apk仓库：https://nginx.org/packages/alpine/v3.16/main
            && apk add -X "https://nginx.org/packages/alpine/v$(egrep -o '^[0-9]+\.[0-9]+' /etc/alpine-release)/main" --no-cache $nginxPackages \
            ;; \
        *) \
# we're on an architecture upstream doesn't officially build for
# let's build binaries from the published packaging sources
            set -x \
            && tempDir="$(mktemp -d)" \
            && chown nobody:nobody $tempDir \
            && apk add --no-cache --virtual .build-deps \
                gcc \
                libc-dev \
                make \
                openssl-dev \
                pcre2-dev \
                zlib-dev \
                linux-headers \
                libxslt-dev \
                gd-dev \
                geoip-dev \
                perl-dev \
                libedit-dev \
                bash \
                alpine-sdk \
                findutils \
            && su nobody -s /bin/sh -c " \
                export HOME=${tempDir} \
                && cd ${tempDir} \
                # https://hg.nginx.org/pkg-oss/archive/1.22.1-1.tar.gz 包含nginx.conf、nginx.logrotate等各种文件
                && curl -f -O https://hg.nginx.org/pkg-oss/archive/${NGINX_VERSION}-${PKG_RELEASE}.tar.gz \
                && PKGOSSCHECKSUM=\"7266f418dcc9d89a2990f504d99ec58d10febbaf078c03630d42843955cee7e50b0f90fb317360384a32473839dc42d8b329b737015ec8dd0d028f90d4d5ed25 *${NGINX_VERSION}-${PKG_RELEASE}.tar.gz\" \
                && if [ \"\$(openssl sha512 -r ${NGINX_VERSION}-${PKG_RELEASE}.tar.gz)\" = \"\$PKGOSSCHECKSUM\" ]; then \
                    echo \"pkg-oss tarball checksum verification succeeded!\"; \
                else \
                    echo \"pkg-oss tarball checksum verification failed!\"; \
                    exit 1; \
                fi \
                && tar xzvf ${NGINX_VERSION}-${PKG_RELEASE}.tar.gz \
                && cd pkg-oss-${NGINX_VERSION}-${PKG_RELEASE} \
                && cd alpine \
                && make all \
                && apk index -o ${tempDir}/packages/alpine/${apkArch}/APKINDEX.tar.gz ${tempDir}/packages/alpine/${apkArch}/*.apk \
                && abuild-sign -k ${tempDir}/.abuild/abuild-key.rsa ${tempDir}/packages/alpine/${apkArch}/APKINDEX.tar.gz \
                " \
            && cp ${tempDir}/.abuild/abuild-key.rsa.pub /etc/apk/keys/ \
            && apk del .build-deps \
            && apk add -X ${tempDir}/packages/alpine/ --no-cache $nginxPackages \
            ;; \
    esac \
# remove checksum deps
    && apk del .checksum-deps \
# if we have leftovers from building, let's purge them (including extra, unnecessary build deps)
    && if [ -n "$tempDir" ]; then rm -rf "$tempDir"; fi \
    && if [ -n "/etc/apk/keys/abuild-key.rsa.pub" ]; then rm -f /etc/apk/keys/abuild-key.rsa.pub; fi \
    && if [ -n "/etc/apk/keys/nginx_signing.rsa.pub" ]; then rm -f /etc/apk/keys/nginx_signing.rsa.pub; fi \
# Bring in gettext so we can get `envsubst`, then throw
# the rest away. To do this, we need to install `gettext`
# then move `envsubst` out of the way so `gettext` can
# be deleted completely, then move `envsubst` back.
    && apk add --no-cache --virtual .gettext gettext \
    && mv /usr/bin/envsubst /tmp/ \
    \
    && runDeps="$( \
        scanelf --needed --nobanner /tmp/envsubst \
            | awk '{ gsub(/,/, "\nso:", $2); print "so:" $2 }' \
            | sort -u \
            | xargs -r apk info --installed \
            | sort -u \
    )" \
    && apk add --no-cache $runDeps \
    && 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 \
# Bring in curl and ca-certificates to make registering on DNS SD easier
    && apk add --no-cache curl ca-certificates \
# 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 \
# create a docker-entrypoint.d directory
    && mkdir /docker-entrypoint.d

COPY docker-entrypoint.sh /
COPY 10-listen-on-ipv6-by-default.sh /docker-entrypoint.d
COPY 20-envsubst-on-templates.sh /docker-entrypoint.d
COPY 30-tune-worker-processes.sh /docker-entrypoint.d
ENTRYPOINT ["/docker-entrypoint.sh"]

EXPOSE 80

STOPSIGNAL SIGQUIT

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