Multiple RUN, ADD, COPY, Instructions Listed

  • Query id: 0008c003-79aa-42d8-95b8-1c2fe37dbfe6
  • Query name: Multiple RUN, ADD, COPY, Instructions Listed
  • Platform: Dockerfile
  • Severity: Low
  • Category: Best Practices
  • URL: Github

Description

Multiple commands (RUN, COPY, ADD) should be grouped in order to reduce the number of layers.
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - dockerfile file
FROM ubuntu
RUN apt-get install -y wget
RUN wget https://…/downloadedfile.tar
RUN tar xvzf downloadedfile.tar
RUN rm downloadedfile.tar
RUN apt-get remove wget
Positive test num. 2 - dockerfile file
FROM ubuntu
COPY README.md ./
COPY package.json ./
COPY gulpfile.js ./
COPY __BUILD_NUMBER ./
Positive test num. 3 - dockerfile file
FROM ubuntu
ADD cairo.spec /rpmbuild/SOURCES
ADD cairo-1.13.1.tar.xz /rpmbuild/SOURCES
ADD cairo-multilib.patch /rpmbuild/SOURCES

Code samples without security vulnerabilities

Negative test num. 1 - dockerfile file
FROM ubuntu
RUN apt-get install wget && wget https://…/downloadedfile.tar && tar xvzf downloadedfile.tar && rm downloadedfile.tar && apt-get remove wget
Negative test num. 2 - dockerfile file
FROM ubuntu
COPY README.md package.json gulpfile.js __BUILD_NUMBER ./
Negative test num. 3 - dockerfile file
FROM ubuntu
ADD cairo.spec cairo-1.13.1.tar.xz cairo-multilib.patch  /rpmbuild/SOURCES

Negative test num. 4 - dockerfile file 
FROM ubuntu
COPY README.md ./one
COPY package.json ./two
COPY gulpfile.js ./three
COPY __BUILD_NUMBER ./four

FROM ubuntu:1.2
ADD README.md ./one
ADD package.json ./two
ADD gulpfile.js ./three
ADD __BUILD_NUMBER ./four
Negative test num. 5 - dockerfile file 
FROM golang:1.16 AS builder
WORKDIR /go/src/github.com/foo/href-counter/
RUN go get -d -v golang.org/x/net/html  
COPY app.go    ./
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o app .
ADD cairo.spec /rpmbuild/SOURCES
ADD cairo-1.13.1.tar.xz /rpmbuild/SOURCES

FROM alpine:latest  
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=builder /go/src/github.com/foo/href-counter/app ./
CMD ["./app"]
RUN useradd -ms /bin/bash patrick

USER patrick