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Add blank lines around headers
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@@ -30,6 +30,7 @@ COPY . . # 复制到 /app/
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RUN cd /app
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RUN echo "hello" > world.txt # 文件在根目录!
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```
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#### 原因分析
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```dockerfile
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@@ -110,6 +111,7 @@ RUN npm install
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COPY . .
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CMD ["node", "server.js"]
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```
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#### 2. 使用绝对路径
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```docker
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@@ -121,6 +123,7 @@ WORKDIR /app
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WORKDIR app
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```
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#### 3. 不要用 RUN cd
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```docker
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@@ -133,6 +136,7 @@ RUN cd /app && echo "hello" > world.txt
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WORKDIR /app
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RUN echo "hello" > world.txt
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```
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#### 4. 适时重置 WORKDIR
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```docker
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