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#82 Minor polish to the command

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This commit is contained in:
Joey Hafner 2023-02-10 14:20:22 -08:00
parent 0dc9d3ae57
commit 8a94368dec
1 changed files with 3 additions and 2 deletions
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5
homelab/server/config/ddns/README.md
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@ -9,9 +9,10 @@ So we generate the config file when it must be updated. To update the file, we c
cd ~/homelab/server/config/ddns/ && \
export $(cat ddclient_secrets.env | xargs) && \
envsubst < ./ddclient/ddclient.template > ./ddclient/ddclient.conf && \
unset $(grep -v '^#' ddclient_secrets.env | sed -E 's/(.*)=.*/\1/' | xargs)
unset $(grep -v '^#' ddclient_secrets.env | sed -E 's/(.*)=.*/\1/' | xargs) && \
docker-compose up -d --force-recreate
```
First we export the variables in the `ddclient_secrets.env` file (which are all simple key-value pairs). Then, the [`envsubst`](https://www.baeldung.com/linux/envsubst-command) command looks for env variable references (like `$USER_Jafner_chat`) in the `ddclient.template` file (via stdin) and replaces them with the values from the current shell. Lastly, we remove the secrets from the shell to preserve security.
First we export the variables in the `ddclient_secrets.env` file (which are all simple key-value pairs). Then, the [`envsubst`](https://www.baeldung.com/linux/envsubst-command) command looks for env variable references (like `$USER_Jafner_chat`) in the `ddclient.template` file (via stdin) and replaces them with the values from the current shell. We remove the secrets from the shell to preserve security. Finally, we recreate the container to apply the new settings.
[StackOverflow - Set environment variables from file of ke/value pairs](https://stackoverflow.com/questions/19331497/set-environment-variables-from-file-of-key-value-pairs)