Merge pull request docker#54 from klintzz/patch-1

Dockerfile CMD path fix

Author: StefanScherer

docs/tutorial/image-building-best-practices/index.md

@@ -15,7 +15,7 @@ command, you can see the command that was used to create each layer within an im
 
     ```plaintext
     IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
-    a78a40cbf866        18 seconds ago      /bin/sh -c #(nop)  CMD ["node" "/app/src/ind…   0B                  
+    a78a40cbf866        18 seconds ago      /bin/sh -c #(nop)  CMD ["node" "src/index.j…    0B                  
     f1d1808565d6        19 seconds ago      /bin/sh -c yarn install --production            85.4MB              
     a2c054d14948        36 seconds ago      /bin/sh -c #(nop) COPY dir:5dc710ad87c789593…   198kB               
     9577ae713121        37 seconds ago      /bin/sh -c #(nop) WORKDIR /app                  0B                  
@@ -56,7 +56,7 @@ FROM node:12-alpine
 WORKDIR /app
 COPY . .
 RUN yarn install --production
-CMD ["node", "/app/src/index.js"]
+CMD ["node", "src/index.js"]
 ```
 
 Going back to the image history output, we see that each command in the Dockerfile becomes a new layer in the image.
@@ -76,7 +76,7 @@ a change to the `package.json`. Make sense?
     COPY package.json yarn.lock ./
     RUN yarn install --production
     COPY . .
-    CMD ["node", "/app/src/index.js"]
+    CMD ["node", "src/index.js"]
     ```
 
 1. Create a file named `.dockerignore` in the same folder as the Dockerfile with the following contents.
@@ -125,7 +125,7 @@ a change to the `package.json`. Make sense?
     ---> 4e68fbc2d704
     Step 5/6 : COPY . .
     ---> a239a11f68d8
-    Step 6/6 : CMD ["node", "/app/src/index.js"]
+    Step 6/6 : CMD ["node", "src/index.js"]
     ---> Running in 49999f68df8f
     Removing intermediate container 49999f68df8f
     ---> e709c03bc597
@@ -154,7 +154,7 @@ a change to the `package.json`. Make sense?
     ---> 4e68fbc2d704
     Step 5/6 : COPY . .
     ---> cccde25a3d9a
-    Step 6/6 : CMD ["node", "/app/src/index.js"]
+    Step 6/6 : CMD ["node", "src/index.js"]
     ---> Running in 2be75662c150
     Removing intermediate container 2be75662c150
     ---> 458e5c6f080c

docs/tutorial/our-application/index.md

@@ -41,7 +41,7 @@ see a few flaws in the Dockerfile below. But, don't worry! We'll go over them.
     WORKDIR /app
     COPY . .
     RUN yarn install --production
-    CMD ["node", "/app/src/index.js"]
+    CMD ["node", "src/index.js"]
     ```
 
     Please check that the file `Dockerfile` has no file extension like `.txt`. Some editors may append this file extension automatically and this would result in an error in the next step.