Firely Server settings with Environment Variables
Warning
It is recommended to use Environment Variables for all sensitive information you want to pass onto to Firely Server, such as connection strings and secrets.
Environment Variables for appsettings
All the settings in Firely Server settings can be overridden by environment variables on your OS.
This can be useful if you want to deploy Firely Server to several machines, each having their own settings for certain options.
For Using Firely Server on Docker using environment variables in the docker-compose file is currently the only way to pass settings to the container.
Or if you don’t want a database password in the appsettings.json
file.
The format for the environment variables is:
VONK_<setting_level_1>[__<setting_level_n>]*
So you start the variable name with the prefix VONK_
, and then follow the properties in the json settings, separating each level with a double underscore __
. Some examples:
appsettings.json:
"Repository" : "SQL"
environment variable:
VONK_Repository=SQL
To access an embedded value, using the ‘__’ separator:
appsettings.json:
"Administration" : {
"SqlDbOptions" : {
"ConnectionString" : "<some connectionstring>"
}
}
environment variable:
VONK_Administration__SqlDbOptions__ConnectionString=<some connectionstring>
Note
A colon :
is also valid as a separator in some environments, but not all. For its wider support we recommend to use __
.
See this article for more information.
Arrays in Environment Variables
Sometimes the appsettings allow for an array of values, e.g. in the setting for AllowedProfiles
in Validating incoming resources. You can address them by appending an extra __
and an index number.
appsettings.json:
"Validation": {
"ValidateIncomingResources": "true",
"AllowedProfiles":
[
"http://hl7.org/fhir/StructureDefinition/daf-patient",
"http://hl7.org/fhir/StructureDefinition/daf-allergyintolerance"
]
}
environment variables:
VONK_Validation__ValidateIncomingResources=true
VONK_Validation__AllowedProfiles__0=http://hl7.org/fhir/StructureDefinition/daf-patient
VONK_Validation__AllowedProfiles__1=http://hl7.org/fhir/StructureDefinition/daf-allergyintolerance
Another example for excluding namespaces in the PipelineOptions
:
"PipelineOptions": {
"Branches": [
{
"Path": "/",
"Exclude": [
"Vonk.Repository.Memory",
"Vonk.Repository.Sql"
]
}
}
environment variables:
VONK_PipelineOptions__Branches__0__Exclude__0=Vonk.Repository.Memory
VONK_PipelineOptions__Branches__0__Exclude__1=Vonk.Repository.Sql
Log settings with Environment Variables
You can control the Log settings with Environment Variables the same way as the Environment Variables for appsettings above. The difference is in the prefix. For the log settings we use ‘VONKLOG_’.
logsettings.json
"Serilog": {
"MinimumLevel": {
"Override": {
"Vonk.Configuration": "Information",
environment variable:
VONKLOG_Serilog__MinimumLevel__Override__Vonk.Configuration=Information
Note that the .
in Vonk.Configuration
is part of a namespace and should not be replaced by a double underscore.
Audit log settings with Environment Variables
You can control the Audit log file configuration with Environment Variables the same way as the Environment Variables for appsettings above. The difference is in the prefix. For the log settings we use ‘VONKAUDITLOG_’.
audit.logsettings.json
"AuditLog": {
"WriteTo": [
{
"Name": "File",
"Args": {
"path": "./audit/AuditLog.log"
environment variable:
VONKAUDITLOG_AuditLog__WriteTo__0__Args__path=./other/directory/AuditLog.log
Return of call stack and Environment Variables
When first implementing Firely Server or for debugging purposes it can be convenient to have the call stack returned even though the server throws a 500 error code. If no specific environment variables are set, Firely Server will return ‘Oops! Something went wrong :(’ with a 500 error code. The call stack will only appear in the log. Setting the ‘ASPNETCORE_ENVIRONMENT’ variable to production will have the same result:
ASPNETCORE_ENVIRONMENT=Production
When the ‘ASPNETCORE_ENVIRONMENT’ variable is set to development the call stack is returned, even when a 500 error code is thrown by the server:
ASPNETCORE_ENVIRONMENT=Development
Customize the location of configuration files
It is possible to change the default location of the *.instance.json
configuration files by setting a reserved environment variable. See Providing settings in a different folder for details.
Changing Environment Variables on Windows
In Windows you can change the Environment Variables with Powershell or through the UI. Based on the first example above:
In Powershell run:
> $env:VONK_Repository="SQL"
or go to your System, open the Advanced system settings –> Environment variables and create a new variable with the name
VONK_Repository
and set the value toSQL
.