Prepare initial version of configuration

.gitignore

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+nppBackup

Dockerfile

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+FROM nginx
+
+ENV REST_API_READ_HOSTNAME=localhost
+ENV REST_API_READ_PORT=8081
+ENV REST_API_WRITE_HOSTNAME=localhost
+ENV REST_API_WRITE_PORT=8082
+
+COPY upstream.location.template /etc/nginx/
+
+RUN perl -0pe 's/root\s+\/usr\/share\/nginx\/html;\s+index\s+index\.html\s+index\.htm;/proxy_pass http:\/\/\$rest_api_host;/igs' /etc/nginx/conf.d/default.conf > /etc/nginx/conf.d/default.conf.part && \
+    echo "include /etc/nginx/upstream.location;" | cat - /etc/nginx/conf.d/default.conf.part > /etc/nginx/conf.d/default.conf
+
+RUN echo "envsubst '\$REST_API_READ_HOSTNAME,\$REST_API_READ_PORT,\$REST_API_WRITE_HOSTNAME,\$REST_API_WRITE_PORT' < /etc/nginx/upstream.location.template > /etc/nginx/upstream.location && cat /etc/nginx/upstream.location" > /docker-entrypoint.d/40-envsubst-upstream-location.sh && \
+    chmod a+x /docker-entrypoint.d/40-envsubst-upstream-location.sh
+
+CMD ["nginx", "-g", "daemon off;"]

upstream.location.template

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+map $request_method $rest_api_host {
+    GET     $REST_API_READ_HOSTNAME:$REST_API_READ_PORT;
+    default $REST_API_WRITE_HOSTNAME:$REST_API_WRITE_PORT;
+}