"如何将所有 Linux 环境变量读入 Docker 容器中的 R？"

Question

I am trying to make an R-Shiny web app secure be getting all of my db credentials out of the code. I am using Azure Webapps for containers and in run time I set environment variables securily via Azure Keyvault.

However, when I use Sys.getenv()

Sys.getenv("AzureSQL_Prod")

... the specified environment variable does not appear. So the questions is why? And how do I get R to understand that I need to access this environment variable?

Answer 1

R environment variables are generated from the .Renviron file - see this Rstudio link for more details ( https://support.rstudio.com/hc/en-us/articles/360047157094-Managing-R-with-Rprofile-Renviron-Rprofile-site-Renviron-site-rsession-conf-and-repos-conf ).

When you invoke Sys.getenv() , the R process searches for R environment variables - not system environment variables.

One option to get around this is to create a .Renviron file - see the link above for details.

An alternative is to retrieve system environment variables explicitly from your R code. My approach is as follows:

system("printenv MY_ENV_VARIABLE", intern = TRUE)

This should output the string corresponding to your system variable. The intern = TRUE allows you to save the output as a variable in your R environment.