i have my local docker CLI binary connected with a docker daemon on the LAN (or better say on the same machine). for certain duties this daemon needs to connect to the internet via a company firewall/proxy system. (the system is based upon Ubuntu 16.04 LTS - the issue might be relevant for a lot more similar systems.)

the daemon is configured similar to this snippet from Ultimate Guide to Docker HTTP Proxy Configuration as shown in case #2 for the file /etc/systemd/system/docker.service.d/http-proxy.conf:


for this config to finally work i have to add (with sudo rights elevation) "username:password@" upfront the "your.proxy" part of the server name.

then i am operating/restarting the systemd and daemon:

sudo systemctl daemon-reload
sudo systemctl restart docker

finally i am checking (as a simple user) the result:

systemctl show --property=Environment docker

It results in something like this (the environment items seemingly listed in a space separated fashion):

Environment=HTTP_PROXY=http://username:[email protected]:8080 HTTPS_PROXY=http://username:[email protected]:8080 NO_PROXY=,localhost

As you can see this simple user command unveils the proxy credentials. I definitely dont want that to be.

How can i prevent any ordinary user from retriving these set of proxy credentials? Is there a method that copes with the systemd environment concept? or is some alternate method needed, if yes, which one?


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