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skynet-webportal/packages/health-check/Dockerfile

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1.5 KiB
Docker

FROM node:16.13.2-alpine
RUN apk update && apk add dnsmasq
WORKDIR /usr/app
ENV PATH="/usr/app/bin:${PATH}"
# schedule critical checks to run every 5 minutes (any failures will disable server)
RUN echo '*/5 * * * * source /etc/environment ; /usr/app/bin/cli run critical >> /proc/1/fd/1' >> /etc/crontabs/root
# schedule extended checks to run on every hour (optional checks, report only)
RUN echo '0 * * * * source /etc/environment ; /usr/app/bin/cli run extended >> /proc/1/fd/1' >> /etc/crontabs/root
COPY package.json yarn.lock ./
RUN yarn --frozen-lockfile
COPY src src
COPY cli cli
COPY bin bin
EXPOSE 3100
ENV NODE_ENV production
# 1. get public server ip and save it in /etc/environment (passed to cron tasks as env variable)
# 2. start dnsmasq in the background with:
# - alias PORTAL_DOMAIN with current server ip so it overrides potential load balancer request
# - default docker nameserver 127.0.0.11 for any other request
# 3. replace docker nameserver with dnsmasq nameserver in /etc/resolv.conf
# 4. start crond in the background to schedule periodic health checks
# 5. start the health-check api service
CMD [ "sh", "-c", \
"export serverip=$(node src/whatismyip.js) && \
echo \"export serverip=${serverip}\" >> /etc/environment && \
dnsmasq --no-resolv --log-facility=/var/log/dnsmasq.log --address=/$PORTAL_DOMAIN/$serverip --server=127.0.0.11 && \
echo \"$(sed 's/127.0.0.11/127.0.0.1/' /etc/resolv.conf)\" > /etc/resolv.conf && \
crond && \
node src/index.js" \
]