updated README with complete nix installation instructions

1 files changed, 13 insertions, 5 deletions

diff --git a/README.md b/README.md
index 6d17487..bfc91e4 100644
--- a/README.md
+++ b/README.md
@@ -3,14 +3,22 @@
 ## Build Instructions
 
 First, install nix. This is a bit of an effort on a docker image.
-So I'll push the container I have with it to the image so everyone has it.
-But if you want to install it yourself, you need to do the following steps.
-Create a temporary user as whom we install nix (it doesn't allow installation as root). 
+The latest version of ymherklotz/polyhedral:1.0 has some of the config files you get when installing nix so everyone has it and if you kill a container you still have your configurations.
+But nix is big so we need to use docker volumes and install it once with the follwing steps.
+
+Create a volume that will be mounted to /nix.
+It's important it's always mounted to /nix cos that's where the nix gets installed. 
+```sh
+docker volume create nix 
+docker run -itd --name gsa-parser -v nix:/nix ymherklotz/polyhedral:1.0
+```
 
+Create a temporary user as whom we install nix (it doesn't allow installation as root). 
+The final command installs multi-user nix which allows root to run nix after installation.
 ``` sh
 apt install curl bzip2 adduser
 adduser --disabled-password --gecos '' nix-installer
-mkdir -m 0755 /nix && chown nix-installer /nix
+chown nix-installer /nix
 sudo -u nix-installer /bin/bash
 cd /home/nix-installer
 sh <(curl -L https://nixos.org/nix/install) --daemon
@@ -34,7 +42,7 @@ For faster compilation, use [cachix](https://www.cachix.org/) to download binary
 nix-env -iA cachix -f https://cachix.org/api/v1/install
 ```
 
-Then, activate the following cache:
+Then, activate the following caches:
 
 ``` sh
 USER=root cachix use jmc