42 lines
1.6 KiB
Docker
42 lines
1.6 KiB
Docker
FROM node:16.14.2-alpine
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RUN apk add --no-cache dnsmasq~=2
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WORKDIR /usr/app
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ENV PATH="/usr/app/bin:${PATH}"
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# schedule critical checks to run every 5 minutes (any failures will disable server)
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# schedule extended checks to run on every hour (optional checks, report only)
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RUN echo '*/5 * * * * source /etc/environment ; /usr/app/bin/cli run critical >> /proc/1/fd/1' >> /etc/crontabs/root && \
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echo '0 * * * * source /etc/environment ; /usr/app/bin/cli run extended >> /proc/1/fd/1' >> /etc/crontabs/root
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COPY packages/health-check/package.json \
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packages/health-check/yarn.lock \
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./
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RUN yarn --frozen-lockfile
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COPY packages/health-check/src src
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COPY packages/health-check/cli cli
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COPY packages/health-check/bin bin
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EXPOSE 3100
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ENV NODE_ENV production
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# 1. get public server ip and save it in /etc/environment (passed to cron tasks as env variable)
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# 2. start dnsmasq in the background with:
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# - alias PORTAL_DOMAIN with current server ip so it overrides potential load balancer request
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# - default docker nameserver 127.0.0.11 for any other request
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# 3. replace docker nameserver with dnsmasq nameserver in /etc/resolv.conf
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# 4. start crond in the background to schedule periodic health checks
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# 5. start the health-check api service
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CMD [ "sh", "-c", \
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"export serverip=$(node src/whatismyip.js) && \
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echo \"export serverip=${serverip}\" >> /etc/environment && \
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dnsmasq --no-resolv --log-facility=/var/log/dnsmasq.log --address=/$PORTAL_DOMAIN/$serverip --server=127.0.0.11 && \
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echo \"$(sed 's/127.0.0.11/127.0.0.1/' /etc/resolv.conf)\" > /etc/resolv.conf && \
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crond && \
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node src/index.js" \
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]
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