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Always combine RUN apt-get update with apt-get install in the same RUN

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statement.

From the [docs](https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/#build-cache) in March 2017:

Always combine RUN apt-get update with apt-get install in the same  RUN statement, for example

RUN apt-get update && apt-get install -y package-bar

Using apt-get update alone in a RUN statement causes caching issues and subsequent apt-get install instructions fail.

Signed-off-by: Jing Qiu <aqiu0720@gmail.com>
This commit is contained in:
Jing Qiu
2017-05-25 11:38:35 +08:00
parent 81dddac7d6
commit 750d72873d
1 changed files with 9 additions and 2 deletions
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11
Dockerfile.build
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@@ -1,5 +1,12 @@
FROM ubuntu:16.04
RUN apt-get update
RUN apt-get install -y golang btrfs-tools git-core libdevmapper-dev libgpgme11-dev go-md2man
RUN apt-get update && apt-get install -y \
golang \
btrfs-tools \
git-core \
libdevmapper-dev \
libgpgme11-dev \
go-md2man
ENV GOPATH=/
WORKDIR /src/github.com/projectatomic/skopeo