Docker

How to healthcheck distroless image

copy a wget or curl binary to distroless image to healthcheck

How to healthcheck in distroless image

Dockerfile

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### For HEALTHCHECK
FROM busybox AS wgeter

# wget grpc-health-probe
RUN wget -O /tmp/hc https://github.com/grpc-ecosystem/grpc-health-probe/releases/download/v0.4.19/grpc_health_probe-linux-amd64 \
    && chmod +x /tmp/hc \
    && mv /tmp/hc /bin/hc

### Deploy
# FROM gcr.io/distroless/static
FROM gcr.dockerproxy.com/distroless/static
ENV TZ=Asia/Shanghai

# copy wget and health, one for http healthcheck, one for grpc healthcheck
COPY --from=wgeter /bin/wget /bin/wget
COPY --from=wgeter /bin/hc /bin/hc

HEALTHCHECK --interval=5s --timeout=3s --start-period=5s --retries=3 CMD ["hc", "-addr=localhost:9000"]