How To Keep Custom Variables During Upgrade¶

Users often have custom variables defined per their system, that are defined post-installation. These variables are kept in the docker-compose.yml.

To keep these custom variables during an upgrade procedure and avoid resetting them to default values, please follow these steps:

Create a file named customer.env and place it in the /usr/local/ericomshield/ folder
Add desired custom variables to this file. Syntax is:
```
export VAR_NAME="$value"
```
During the upgrade process, variables defined in customer.env file are used to replace default values

Examples¶

To use a custom subnet (different from Shield default one - 10.0.6.0) add this line to the file:
```
export SUB_NET="192.168.5.0/24"
```
To use a custom proxy (different from Shield default one - 3128) add this line to the file:
```
export SHIELD_PROXY_PORT="4456"
```

For additional variables, please contact the Shield Professional Services team.