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updated readme

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updated readme

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updated readme

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updated readme

README.md

@@ -4,7 +4,7 @@
 [![Build Status](https://drone.modem7.com/api/badges/modem7/docker-apt-cacher-ng/status.svg)](https://drone.modem7.com/modem7/docker-apt-cacher-ng)
 [![GitHub last commit](https://img.shields.io/github/last-commit/modem7/docker-apt-cacher-ng)](https://github.com/modem7/docker-apt-cacher-ng)
 
-Docker image for apt-cacher-ng based off of debian:bullseye-slim
+Docker image for apt-cacher-ng.
 
 ---
 
@@ -34,7 +34,7 @@ The `latest` tag has multi-arch support for `amd64`, and `arm64` and will automa
 
 ## Example usage
 
-```
+```bash
 docker run -d \
   --name apt-cacher-ng \
   -p 3142:3142 \
@@ -44,7 +44,7 @@ docker run -d \
 ```
 
 ## Docker Compose example
-```
+```yaml
  ################
  #APT-Cacher-NG##
  ################
@@ -70,24 +70,24 @@ This image runs `apt-cacher-ng`, `cron`, and `rsyslogd` to ensure that apt-cache
 
 In order to configure a host to make use of apt-cacher-ng on a box, you should create a file on the host `/etc/apt/apt.conf` with the following lines:
 
-```
+```bash
 Acquire::http::Proxy "http://<docker-host>:3142";
 ```
 
 Or a one liner for Debian/Ubuntu hosts:
-```
+```bash
 echo "Acquire::http::Proxy \"http://<docker-host>:3142\";" | sudo tee /etc/apt/apt.conf.d/00proxy
 ```
 
 You can also bypass the apt caching server on a per client basis by using the following syntax in your `/etc/apt/apt.conf` file:
 
-```
+```bash
 Acquire::HTTP::Proxy::<repo-url> "DIRECT";
 ```
 
 For example:
 
-```
+```bash
 Acquire::HTTP::Proxy::get.docker.com "DIRECT";
 Acquire::HTTP::Proxy::download.virtualbox.org "DIRECT";
 ```
@@ -96,9 +96,29 @@ Note:  The above assumes that you are mapping port 3142 on the docker host and 3
 
 You can also update the /etc/apt-cacher-ng/acng.conf and add one or more `PassThroughPattern` lines to force clients to bypass a repository:
 
-```
+```bash
 PassThroughPattern: get\.docker\.com
 PassThroughPattern: download\.virtualbox\.org
 ```
 
+## Getting https://download.docker.com to cache
+If you want to cache your Docker.com downloads, you'll need to change the repo to http.
+
+For example, if you're following the [Ubuntu install](https://docs.docker.com/engine/install/ubuntu/) instructions, you'll need to do change the following:
+Instead of
+```bash
+echo \
+  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
+  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+```
+
+Change to:
+```bash
+echo \
+  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] http://download.docker.com/linux/ubuntu \
+  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+```
+
+---
+
 Based on the work from [mbentley](https://github.com/mbentley/docker-apt-cacher-ng) and [sameersbn](https://github.com/sameersbn/docker-apt-cacher-ng).