Dockerfile-alpine.template

ARG IMAGE=alpine:%%ALPINE_VERSION%%
FROM $IMAGE

LABEL maintainer="NGINX Docker Maintainers <docker-maint@nginx.com>"

ENV NGINX_VERSION %%NGINX_VERSION%%
ENV NJS_VERSION   %%NJS_VERSION%%
ENV PKG_RELEASE   %%PKG_RELEASE%%

ARG UID=101
ARG GID=101

RUN set -x \
# create nginx user/group first, to be consistent throughout docker variants
    && addgroup -g $GID -S nginx \
    && adduser -S -D -H -u $UID -h /var/cache/nginx -s /sbin/nologin -G nginx -g nginx nginx \
    && apkArch="$(cat /etc/apk/arch)" \
    && nginxPackages="%%PACKAGES%%
    " \
    && case "$apkArch" in \
        x86_64|aarch64) \
# arches officially built by upstream
            set -x \
            && KEY_SHA512="e7fa8303923d9b95db37a77ad46c68fd4755ff935d0a534d26eba83de193c76166c68bfe7f65471bf8881004ef4aa6df3e34689c305662750c0172fca5d8552a *stdin" \
            && apk add --no-cache --virtual .cert-deps \
                openssl \
            && wget -O /tmp/nginx_signing.rsa.pub https://nginx.org/keys/nginx_signing.rsa.pub \
            && if [ "$(openssl rsa -pubin -in /tmp/nginx_signing.rsa.pub -text -noout | openssl sha512 -r)" = "$KEY_SHA512" ]; then \
                echo "key verification succeeded!"; \
                mv /tmp/nginx_signing.rsa.pub /etc/apk/keys/; \
            else \
                echo "key verification failed!"; \
                exit 1; \
            fi \
            && apk del .cert-deps \
            && apk add -X "%%PACKAGEREPO%%v$(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 $tempDir \
            && apk add --no-cache --virtual .build-deps \
                gcc \
                libc-dev \
                make \
                openssl-dev \
                pcre-dev \
                zlib-dev \
                linux-headers \
                libxslt-dev \
                gd-dev \
                geoip-dev \
                perl-dev \
                libedit-dev \
                mercurial \
                bash \
                alpine-sdk \
                findutils \
            && su nobody -s /bin/sh -c " \
                export HOME=${tempDir} \
                && cd ${tempDir} \
                && hg clone https://hg.nginx.org/pkg-oss \
                && cd pkg-oss \
                && hg up %%REVISION%% \
                && 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 $nginxPackages \
            ;; \
    esac \
# if we have leftovers from building, let's purge them (including extra, unnecessary build deps)
    && if [ -n "$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

# implement changes required to run NGINX as an unprivileged user
RUN sed -i 's,listen       80;,listen       8080;,' /etc/nginx/conf.d/default.conf \
    && sed -i '/user  nginx;/d' /etc/nginx/nginx.conf \
    && sed -i 's,/var/run/nginx.pid,/tmp/nginx.pid,' /etc/nginx/nginx.conf \
    && sed -i "/^http {/a \    proxy_temp_path /tmp/proxy_temp;\n    client_body_temp_path /tmp/client_temp;\n    fastcgi_temp_path /tmp/fastcgi_temp;\n    uwsgi_temp_path /tmp/uwsgi_temp;\n    scgi_temp_path /tmp/scgi_temp;\n" /etc/nginx/nginx.conf \
# nginx user must own the cache and etc directory to write cache and tweak the nginx config
    && chown -R $UID:0 /var/cache/nginx \
    && chmod -R g+w /var/cache/nginx \
    && chown -R $UID:0 /etc/nginx \
    && chmod -R g+w /etc/nginx

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 8080

STOPSIGNAL SIGQUIT

USER $UID

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