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# MBS
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MBS is deployed in centos stream by the following components:
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* Ansible Fedmsg Role
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* Ansible MBS Role
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Note: MBS depends on Fedmsg as a bridge to fedora-messaging.
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## Ansible Fedmsg Role
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Repository: https://github.com/CentOS/ansible-role-fedmsg
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### Dependencies
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None
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### Description
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This role installs fedmsg in a host with zeromq enabled.
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We need zeromq enabled since that's what is used to bridge fedmsg to fedora-messaging.
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It is currently deployed in the same host used by MBS.
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## Ansible MBS Role
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Repository: https://github.com/CentOS/ansible-role-mbs
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### Dependencies
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* https://github.com/CentOS/ansible-role-fedmsg
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* https://github.com/CentOS/ansible-role-httpd
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* https://github.com/CentOS/ansible-role-postgresql
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### Description
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This role installs both mbs-frontend and mbs-backend.
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Including the role without specifying a task file will install everything in the same host
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but you can select to install either one by including a specific task file: https://github.com/CentOS/ansible-role-mbs/tree/staging/tasks - keep in mind you may also need to select `system.yml` if doing so.
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MBS Frontend requirements:
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* kerberos keytabfile for httpd POST authentication (GET requests are authless).
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* HTTPD CA, certificate and key files;
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MBS Backend requirements:
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* keytab file for koji authentication
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Fedmsg usage:
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* Bridges fedora-messaging messages to MBS;
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* communication between mbs-frontend to mbs-backend;
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* listen to messages sent by fedora-messaging;
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* koji updates will be sent to fedora-messaging which will be consumed by a mbs consumer and trigger workers accordingly.
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You can see messages sent to fedmsg by running `fedmsg-tail` or `fedmsg-tail --include org.centos.prod.buildsys`.
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