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# Build Systems overview
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To build artifacts that will be released/pushed to the mirror network, CentOS Project relies on distributed build systems, mostly :
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* [Koji](https://pagure.io/koji)
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* [reimzul](reimzul.md)
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While reimzul is still being used for CentOS Linux 7 rpm builds, koji is now the one being used for CentOS Linux 8 and all Stream releases (but different environments)
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RPM packages built by/for Special Interest Groups on our [Community Build Service](koji-cbs.md) are also built on a koji instance, different from the one[s] used to build CentOS Linux/Stream distributions.
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We adviced you to read upstream koji documentation to have details of all needed components and how they can be combined all together to be able to build/distribute packages, but here is a quick overview :
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* kojihub/kojiweb : this is the main component, itself needing:
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* authentication system in place (using either TLS/x509 certificates of kerberos tickets)
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* postgresql database access : to store build results, activity, etc
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* NFS storage: to store all builds logs and rpm packages and composed repositories
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* httpd running with proper TLS certificates to encrypt traffic between hub and builders
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* kojid : multiple builders, responsible to pick tasks (on the hub), and then use mock to build rpm packages and send results back to the kojihub
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* depending if one of these nodes is also in the `createrepo` channel, it will itself RW rights on the NFS volume to be able to update repodata after some builds
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Now you can read other sub-sections about dedicated koji and some specific notes around these implementations
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It's through worth knowing that *all* koji enviroments (almost) are deployed from the same Ansible roles (but with different settings, per different inventory or group variables)
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Some links to ansible roles:
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* [kojihub](https://github.com/centos/ansible-role-kojihub)
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* [kojid](https://github.com/centos/ansible-role-kojid)
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* [nfs-server](https://github.com/centos/ansible-role-nfs-server)
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* (only used for SIGs)[stylo](https://github.com/centos/ansible-role-stylo)
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