Hi,
Just started with Docker. Running on a Synology 918+, docker version 17.05.0-ce.
My goal is to build an image based on alpine with nginx and the mod_rrd_graph module. The module can be linked to nginx during compile. According to the author of the module, rrdtool needs to be installed.
So, I started with alpine:3.9 on github and added stuff to the Dockerfile. The part between LABEL and RUN GPG_KEYS has been added by me. In the CONFIG= part one line has been added by me:
–add-module=/tmp/mod_rrd_graph
Some links in the dockerfile have been removed by me, cause as a new user in the forum my first post(s) may contain no more than two links 
FROM alpine:3.9
LABEL maintainer=“NGINX Docker Maintainers”
ENV NGINX_VERSION=1.15.8 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/share
RUN apk --no-cache add rrdtool
RUN mkdir /tmp/mod_rrd_graph
COPY config /tmp/mod_rrd_graph
COPY ngx_http_rrd_graph_module.c /tmp/mod_rrd_graphRUN rrdtool
RUN GPG_KEYS=B0F4253373F8F6F510D42178520A9993A1C052F8
&& CONFIG="
–prefix=/etc/nginx
–sbin-path=/usr/sbin/nginx
–modules-path=/usr/lib/nginx/modules
–add-module=/tmp/mod_rrd_graph
–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
"
&& 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 -o nginx.tar.gz
&& curl -fSL.asc -o nginx.tar.gz.asc
&& export GNUPGHOME=“$(mktemp -d)”
&& found=‘’;
for server in
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
&& rm nginx.tar.gz
&& 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-$NGINX_VERSION
# Bring in gettext so we can getenvsubst, then throw
# the rest away. To do this, we need to installgettext
# then moveenvsubstout of the way sogettextcan
# be deleted completely, then moveenvsubstback.
&& apk add --no-cache --virtual .gettext gettext
&& mv /usr/bin/envsubst /tmp/
&& runDeps="$(
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.logCOPY nginx.conf /etc/nginx/nginx.conf
COPY nginx.vh.default.conf /etc/nginx/conf.d/default.confEXPOSE 80
STOPSIGNAL SIGTERM
CMD [“nginx”, “-g”, “daemon off;”]
The “RUN rrdtool” part from the Dockerfile is working:
RRDtool 1.7.0 Copyright by Tobias Oetiker <tobi@oetiker.ch>
Compiled Nov 22 2018 22:13:07
[skipped rest]
When it wants to add the module to nginx, things go wrong:
configuring additional modules
adding module in /tmp/mod_rrd_graph
checking for RRDtool ... not found
./configure: error: ngx_rrd_graph requires RRDtool 1.3 or later.
How should I troubleshoot this? It’s unclear to me why it thinks that RRDtool is not available.