一樣我們今天來看怎麼可以例用multi-staging來幫同事的node js docker image瘦身
首先先看第一版的

FROM node:14.17-alpine

RUN apk add --no-cache \
    vim \
    git \
    curl \
    bash \
    python2 \
    make \
    gcc \
    g++ \
    openssh-client

WORKDIR /bidAgent
# nodejs dependencies
COPY . /bidAgent
RUN yarn global add pm2@4.4.0 && pm2 install pm2-logrotate && yarn global add lerna --ignore-engines
RUN yarn install --only=production && yarn cache clean
RUN lerna link

RUN echo `mktemp -d` > $HOME/TMPNAME
ENV NODE_ENV=production

CMD ["pm2-runtime", "pm2.config.js"]

Build 完size 大約1.31 GB

ccc                                             latest    c229a62610be   3 minutes ago    1.31GB

使用multi-staging

FROM node:14.17-slim as base

RUN apt update -y && \
    apt install -y \
    vim \
    curl \
    bash \
    openssh-client && \
    rm -rf /var/lib/apt/lists/*

WORKDIR /bidAgent
# nodejs dependencies

FROM base as builder
RUN apt update -y && \
    apt install -y \
    git \
    build-essential \
    python3
COPY package.json /bidAgent
COPY lerna.json /bidAgent
COPY yarn.lock /bidAgent
COPY . /bidAgent
RUN yarn install --only=production && yarn cache clean
RUN rm -rf /bidAgent/node_modules/node-rdkafka/deps/librdkafka/examples

FROM base as production

COPY --from=builder /bidAgent/node_modules /bidAgent/node_modules
COPY --from=builder /bidAgent/packages /bidAgent/packages
COPY . /bidAgent
RUN yarn global add pm2@4.4.0 && pm2 install pm2-logrotate && yarn global add lerna --ignore-engines
RUN lerna link

RUN echo `mktemp -d` > $HOME/TMPNAME
ENV NODE_ENV=production

CMD ["node", "/bidAgent/index.js"]

這邊我有把alpine換成debian-slim，雖然image會大一些，但可以縮短一些build time
然後因為我有用dfimage去檢查node-rdkafka這個套件，儼然發現放了一堆檔案在example所以手動的把他刪除了也省去不少空間
所以大家真的要多利用hive和dfimage檢查自己的image，多花一點時間，可以省下很多麻煩。
Build 完 Size從 1.31 GB 縮減到876 MB

ddd                                             latest    5e22f26244ae   41 seconds ago   876MB

因此大家可以回頭檢視看看自家的image做些調整。
這樣在HPA部署或是Node provision起來要部署pod的時候會更縮短時間喔。