feat: add dockerfile and adjust the readme for docker build /running

Author: jenningsloy318

Dockerfile

@@ -0,0 +1,31 @@
+FROM docker.io/library/centos:8 AS builder
+
+LABEL maintainer="Jennings Liu <[email protected]>"
+
+ARG ARCH=amd64
+
+ENV GOROOT /usr/local/go
+ENV GOPATH /go
+ENV PATH "$GOROOT/bin:$GOPATH/bin:$PATH"
+ENV GO_VERSION 1.15.2
+ENV GO111MODULE=on 
+
+
+# Build dependencies
+
+RUN yum update -y && \
+    yum install -y  rpm-build make  git && \
+    curl -SL https://dl.google.com/go/go${GO_VERSION}.linux-${ARCH}.tar.gz | tar -xzC /usr/local 
+RUN mkdir -p /go/src/github.com/ && \
+    git clone https://github.com/jenningsloy318/redfish_exporter /go/src/github.com/jenningsloy318/redfish_exporter && \
+    cd /go/src/github.com/jenningsloy318/redfish_exporter && \
+    make build
+
+FROM docker.io/library/centos:8 
+
+COPY --from=builder /go/src/github.com/jenningsloy318/redfish_exporter/build/redfish_exporter /usr/local/bin/redfish_exporter
+RUN mkdir /etc/prometheus
+COPY config.yml.example /etc/prometheus/redfish_exporter.yml
+CMD ["/usr/local/bin/redfish_exporter","--config.file","/etc/prometheus/redfish_exporter.yml"]
+
+

README.md

@@ -36,19 +36,19 @@ or build in centos 8 docker image
 ```sh
 make docker-build-centos8
 ```
+or we can also build a docker image  using [Dockerfile](./Dockerfile)
 
 ## Running
-
-To run redfish_exporter do something like:
-```sh
-redfish_exporter --config.file=redfish_exporter.yml
-```
-and run
-```sh
-redfish_exporter -h
-```
-for more options.
-
+- running directly on linux
+  ```sh
+  redfish_exporter --config.file=redfish_exporter.yml
+  ```
+  and run   `redfish_exporter -h
+  `  for more options.
+
+- running in container
+  
+  Also if you build it as a docker image, you can also run in container, just remember to replace your config  `/etc/prometheus/redfish_exporter.yml` in container
 ## Scraping
 
 We can get the metrics via