Merge pull request #789 from molgenis/SELinux-fix

Update installing.md

docs/ops/installing.md

@@ -47,6 +47,12 @@ The values needed are:
 
 You need a SSL certificate to configuring the front-end proxy and make the browser use **https** before putting data on the server.
 
+If SELinux is enabled, run the following command to ensure that the application can connect to required services:
+
+```bash
+setsebool -P httpd_can_network_connect on
+```
+
 ## Installing Armadillo as service
 
 We run Armadillo in production as a Linux service on Ubuntu, ensuring it gets restarted when the server is rebooted. You might be able to reproduce also on CentOS (using yum instead of apt).
@@ -184,4 +190,4 @@ For questions on other linux release you can email [email protected]
 ## What's next?
 
 * [For the server owner or data manager who need to put data on to the server](https://molgenis.github.io/molgenis-r-armadillo/)
-* [For the researcher who want to start analyzing the data on the server](https://molgenis.github.io/molgenis-r-datashield/)
+* [For the researcher who want to start analyzing the data on the server](https://molgenis.github.io/molgenis-r-datashield/)