I was in the same boat as F1uffy and CybertSys. I worked on making this work for two days. I got it working with Kali so I will outline the steps I used. I think this easier than trying to make it work in CentOS. Follow these steps and pay attention to any extra items you may be prompted for along the way. For me, the most important step was installing RVM and setting the correct version of Ruby that matched the Gemfile version that Dradis is using. (2.4.1)
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Install Kali Linux 2020.2 Release as a VM in VMware workstation.
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Follow the instructions on this page. Installing Dradis on Kali Linux | Dradis Framework
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Install RVM by following the instructions here. RVM: Ruby Version Manager - Installing RVM. For reference have a look at Ruby versioning with Ruby Version Manager (RVM) | by Lorna Tumuhairwe | The Andela Way | Medium. Make sure you install the correct version of Ruby (2.4.1)
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Now you are ready to follow the instructions located here. Installing Dradis from Git | Dradis Framework