今天分享给大家一个工具:minid
工具下载直接访问github搜索:minid
借助该工具可以优化Dockerfile,将Dockerfile的分层减少,从而达到使镜像变小的目的
该工具主要是分析RUN,ENV等指令,将能合并分层的指令进行自动化分层,比如:
RUN cd /path/to/dir
RUN yum install Python
两条指令可以合并为:
RUN cd /path/to/dir && yum install python
$ cat Dockerfile # 8 layers FROM golang:1.10-alpine3.8 AS build ENV DEP_VERSION 0.4.1 WORKDIR /go/src/github.com/orisano/gobase RUN apk add --no-cache git make mailcap tzdata RUN wget -O /usr/local/bin/dep https://github.com/golang/dep/releases/download/v${DEP_VERSION}/dep-linux-amd64 && chmod +x /usr/local/bin/dep RUN wget -O /usr/local/bin/depinst https://github.com/orisano/depinst/releases/download/1.0.1/depinst-linux-amd64 && chmod +x /usr/local/bin/depinst COPY Gopkg.lock Gopkg.toml ./ RUN dep ensure -vendor-only ENV CGO_ENABLED=0 ENV GO_LDFLAGS="-extldflags='-static'" RUN go build -i ./vendor/... COPY . . RUN make build $ minid # 6 layers FROM golang:1.10-alpine3.8 AS build ENV DEP_VERSION=0.4.1 WORKDIR /go/src/github.com/orisano/gobase RUN apk add --no-cache git make mailcap tzdata && wget -O /usr/local/bin/dep https://github.com/golang/dep/releases/download/v${DEP_VERSION}/dep-linux-amd64 && chmod +x /usr/local/bin/dep && wget -O /usr/local/bin/depinst https://github.com/orisano/depinst/releases/download/1.0.1/depinst-linux-amd64 && chmod +x /usr/local/bin/depinst COPY Gopkg.lock Gopkg.toml ./ RUN dep ensure -vendor-only ENV CGO_ENABLED=0 GO_LDFLAGS="-extldflags='-static'" RUN go build -i ./vendor/... COPY . . RUN make build