I just want to add some information. @vmarmol 's answer is just fine, but, sadly there is a typing error.

It should be:
ENTRYPOINT ["/usr/bin/cadvisor", "--http_auth_file", "auth.htpasswd", "--http_auth_realm”, “localhost"]

I'm totally new with Docker, so it was hard to see what actually went wrong. After attaching to the container, i was able to see that something wasn't added like it should (Well.. i just took two hours to figure that out - Rofl):

Error response from daemon: no such id: 10636eca00c7
root@ docker attach 084e540e96a9
flag provided but not defined: -http_auth_realm localhost

So in the last line, you need to seperate --http_auth_realm and localhost.

And... For all the other people, trying to find a nice solution with Google searches and stuff - Here is what i thing is the most easy way to add this:

Make a dir like "docker_cadvisor" in your home destination.
Navigate to the folder.
Make a htpasswd file and call it "auth.htpasswd" (More info at http://www.cyberciti.biz/faq/create-update-user-authentication-files/)

htpasswd -c auth.htpasswd WEBUSERNAME

Make the Dockerfile, and add the information

nano Dockerfile

Paste in the informations:

FROM google/cadvisor:latest
ADD auth.htpasswd /auth.htpasswd

EXPOSE 8080
ENTRYPOINT ["/usr/bin/cadvisor", "--http_auth_file", "auth.htpasswd", "--http_auth_realm", "localhost"]

Build the container, and call it somehing - I personally just called it "cadvisor". Please note that you have to keep the dot in the code.

docker build -t cadvisor .

Give it some time.
Run the container - Note that you NEED to CHANGE the buttomline, to the container ID you will get just after docker is done with working out all the good stuff. Actually i guess you are able to put in "cadvisor" as well the ID..

sudo docker run \
  --volume=/:/rootfs:ro \
  --volume=/var/run:/var/run:rw \
  --volume=/sys:/sys:ro \
  --volume=/var/lib/docker/:/var/lib/docker:ro \
  --publish=8080:8080 \
  --detach=true \
  --name=cadvisor \
  --restart=always \
bdc1c2d18ab5

Note that i have added "restart=always". This means that cAdvisor will start with the system. I personally changed publish from the default to "--publish=8383:8080 " cause of another resource, running at port 8080.

Hopefully this can help other people, trying to get cAdvisor working with Docker WITH PASSWORD support. Please ask, if you read this and have any questions - and if you spot typing errors.

Update:
I just saw my own post - If you like dirty stuff - this is just a bit easier ;-) Replace USERNAME and PASSWORD.

cd /home/USERNAME \
&& htpasswd -c -i -b auth.htpasswd USERNAME PASSWORD \
&& touch newfile \
&& cat <<EOF > Dockerfile
FROM google/cadvisor:latest
ADD auth.htpasswd /auth.htpasswd

EXPOSE 8080
ENTRYPOINT ["/usr/bin/cadvisor", "--http_auth_file", "auth.htpasswd", "--http_auth_realm", "localhost"]
EOF
docker build -t cadvisor . \
&& docker run \
  --volume=/:/rootfs:ro \
  --volume=/var/run:/var/run:rw \
  --volume=/sys:/sys:ro \
  --volume=/var/lib/docker/:/var/lib/docker:ro \
  --publish=8080:8080 \
  --detach=true \
  --name=cadvisor \
  --restart=always \
 cadvisor

basic auth when running inside of a container #784

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