FROM node:16.3.0-alpine RUN apk update && apk add dnsmasq WORKDIR /usr/app # schedule critical checks to run every 5 minutes (any failures will disable server) RUN echo '*/5 * * * * /usr/app/cli/run critical > /dev/stdout' >> /etc/crontabs/root # schedule extended checks to run on every hour (optional checks, report only) RUN echo '0 * * * * /usr/app/cli/run extended > /dev/stdout' >> /etc/crontabs/root COPY package.json . RUN yarn --no-lockfile COPY src src COPY cli cli EXPOSE 3100 ENV NODE_ENV production # 1. start dnsmasq in the background with: # - alias to siasky.net with current server ip so it overrides load balancer request # - default docker nameserver 127.0.0.11 for any other request # 2. replace docker nameserver with dnsmasq nameserver in /etc/resolv.conf # 3. start crond in the background to schedule periodic health checks # 4. start the health-check api service CMD [ "sh", "-c", \ "dnsmasq --no-resolv --log-facility=/var/log/dnsmasq.log --address=/siasky.net/$(node src/whatismyip.js) --server=127.0.0.11 ; \ echo \"$(sed 's/127.0.0.11/127.0.0.1/' /etc/resolv.conf)\" > /etc/resolv.conf ; \ crond ; \ node src/index.js" \ ]