put docker instructions in test/image/README.md

Author: etpinard

docker_part_readme.md

@@ -1,24 +1,83 @@
-# plotly.js
+# plotly.js image testing
 -----
 
+Test plotly.js with Plotly Image-Server docker container.
 
-The premier high-level javascript graphing library
+### Run the container
 
+Under your `plotly.js` folder, run
+
+```bash
+$ docker run -d --name imagetest \
+    -v $PWD:/var/www/streambed/image_server/plotly.js \
+    -p 9010:9010 -p 2022:22 plotly/imageserver:[version]
+```
+
+where `[version]` is the latest Plotly Image-Server docker container version
+as listed on
+[hub.docker.com](https://hub.docker.com/r/plotly/imageserver/tags/).
+
+### Run the tests
+
+Under your `plotly.js` folder, run
+
+```bash
+$ npm run test-image
+```
+
+### SSH into docker
+
+```bash
+$ ssh -p 2022 root@localhost # with password `root`
+```
+
+If you got this error:
+
+```
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
+Someone could be eavesdropping on you right now (man-in-the-middle attack)!
+It is also possible that a host key has just been changed.
+The fingerprint for the ECDSA key sent by the remote host is
+dd:1e:e0:95:8d:ef:06:b8:0f:2f.
+Please contact your system administrator.
+Add correct host key in /home/jh/.ssh/known_hosts to get rid of this message.
+Offending ECDSA key in /home/jh/.ssh/known_hosts:104
+  remove with: ssh-keygen -f "/home/jh/.ssh/known_hosts" -R [localhost]:2022
+ECDSA host key for [localhost]:2022 has changed and you have requested strict checking.
+Host key verification failed.
+```
+simply run
+
+```bash
+$ ssh-keygen -f "${HOME}/.ssh/known_hosts" -R [localhost]:2022
+```
+
+to remove host information.
 
 
+### List all images
 
-## Test Plotly.js with Plot.ly Image-Server docker container
+```bash
+docker images
+```
 
-### Run container
+### List all containers
 
 ```bash
-$ docker run -d --name your_container_name \
-                      -v $PWD/plotlyjs:/var/www/streambed/image_server/plotlyjs \
-		      -p 9010:9010 -p 2022:22 plotly/imageserver:[version]
+docker ps -a
 ```
 
-### Run the test
+### Stop container
 
 ```bash
-$ docker exec -i your_container_name /bin/bash -c "cd /var/www/streambed/image_server/plotlyjs && npm run test-image"
-``` 
+docker stop [container hash]
+```
+
+### Remove container
+
+```bash
+docker rm [container hash]
+```