# CentOS Operations guide

This section will list some of the operations that we have to automate to deploy/maintain/migrate/decommission services and/or infrastructure components used in the CentOS infra.

## Supported Operating Systems in CentOS Infra

### CentOS 

It makes sense to use what we build and distribute and we've always relied on CentOS Linux for our own infrastructure. To deploy it we just use our own mirror.centos.org mirrors pool and internal mirrors.

Deployed and maintained versions (in ansible roles and repositories) :

  * CentOS Linux 7

  * CentOS Stream 8

### Red Hat Enterprise Linux

We also started to deploy RHEL in parallel for some services that will have to stay longer available (starting from CentOS Stream, expected life time is ~5y, versus 10y for RHEL).

We point to an internal mirror for deployments and also use some TLS certs (subscription) to access Red Hat CDN to get updates (or point also to internal mirror)

Deployed and maintained versions (in ansible roles and repositories) :

  * RHEL 8

!!! note

    See internal ansible inventory `group_vars/all` doc/notes/snippet around the `rhel_*` variables about how to use this, not covered in public documentation for obvious easons