AppNeta CMP (C50) - Docker Daemon Proxy for systemd
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AppNeta CMP (C50) - Docker Daemon Proxy for systemd


Article ID: 268621


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In some environments a Proxy is required for outbound connectivity.  Docker Daemon for systemd can be configured with a proxy to ensure that all commands and other communications go through the configured proxy.

For example, you may see the following error trying to setup a CMP:

sudo /bin/bash  
> Would you like to use host networking? (y/n) (default=n): y
Selected Host networking
Setting container time zone to America/New_York
Setting talos port to 26268
Error response from daemon: Get "": context deadline exceeded
Exited with code 1. Error on line 1.



The above error was a result of the script timing out due to it being unable to reach AppNeta's Azure Repository for CMPs as Docker required a Proxy to be configured.


You can configure a proxy for the Docker Daemon for Systemd with the following steps:

1. We will want to check or create if the drop-in driectory for Docker Daemon exists for Systemd:

admin@test:~$ sudo ls -ld /etc/systemd/system/docker.service.d
[sudo] password for admin:
ls: cannot access '/etc/systemd/system/docker.service.d': No such file or directory

If the above example the directory does not exist so we will need to create it:

sudo mkdir /etc/systemd/system/docker.service.d


2. Now that the directory has been created we will want to create a configuration file to supply the Proxy settings:

sudo nano /etc/systemd/system/docker.service.d/http-proxy.conf

3. We can now populate the Proxy configuration with the following content, please note that the formatting is important and the first line must be [Service]


If you have internal Docker registries or FQDNs/IPs that do not need to connect through a proxy, add the NO_PROXY variable:



4. Apply the changes to the Docker Daemon:

sudo systemctl daemon-reload



5. We can verify that the Proxy configuration has been successfully loaded:

sudo systemctl show --property Environment docker



6. Once they have been verified and they appear correctly configured you can restart Docker to apply them:

sudo systemctl restart docker

Additional Information

Docker's official documentation for configuring a Docker Daemon Proxy can be found here: Configure the daemon with systemd | Docker Documentation