eurolinux-6-vault (#97)

* eurolinux-6-vault

* fixes after review

docs/knowledge-base/eurolinux-6-vault.md

@@ -0,0 +1,58 @@
+# Accessing EuroLinux 6.10 Vaulted Repositories
+
+## EuroLinux 6 ELS EOL 2024-06-30
+
+EuroLinux 6 reached its end of life on 2020-11-30; EuroLinux 6 ELS
+reached EOL on 2024-06-30 and is no longer supported. This means critical
+security updated are no longer provided, making your system highly vulnerable
+to security threats.
+
+
+Upgrading might not always be possible due to reasons like replicating a
+specific production environment in development, supporting legacy systems, or
+strict software compatibility requirements. In such cases, while accessing the
+vaulted repositories is an option, be aware of the inherent security risks.
+
+
+## EuroLinux 6 vault
+
+Using the following gist is a straightforward way to access the EuroLinux 6
+vault:
+
+<script src="https://gist.github.com/AlexBaranowski/cdff6f0c45a50f16ff485813518e44b6.js"></script>
+
+Or manually add the following to `/etc/yum.repos.d/eurolinux-6-vault-repos.repo`:
+
+```ini
+[eurolinux6-base]
+name=Eurolinux 6 Base Vault
+baseurl=https://vault.cdn.euro-linux.com/legacy/eurolinux/6/6.10/BaseOS/x86_64/os/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-eurolinux
+
+[eurolinux6-extras]
+name=Eurolinux 6 Updates Vault
+baseurl=https://vault.cdn.euro-linux.com/legacy/eurolinux/6/6.10/Extras/x86_64/os/
+gpgcheck=1
+gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-eurolinux
+```
+
+If the GPG key is not present on your system, you can add it with the following
+command:
+
+```bash
+curl -o /etc/pki/rpm-gpg/RPM-GPG-KEY-eurolinux https://fbi.cdn.euro-linux.com/security/RPM-GPG-KEY-eurolinux
+```
+
+## Removing subscription packages
+
+Previously, due to EuroLinux 6 repositories being paywalled, a subscription was
+required. This involved tools like `rhn_register` or `el_register` alongside
+the EuroMan service or a local mirror. With EuroMan's sunsetting alongside
+EuroLinux 6 ELS EOL, these subscription-related packages are no longer
+necessary (unless using custom Spacewalk/EuroMan Forman/EuroMan). You can
+safely remove them using the following command:
+
+```bash
+sudo yum remove -y rhn* subscription*
+```

docs/knowledge-base/eurolinux-7-vault.md

@@ -15,8 +15,7 @@ vault:
 <script src="https://gist.github.com/AlexBaranowski/4d1aab197164ec55e200c00ceb6884db.js"></script>
 
 
-Or manually add the following files to `/etc/yum.repos.d/eurolinux-7-vault-repos.repo`:
-
+Or manually add the following to `/etc/yum.repos.d/eurolinux-7-vault-repos.repo`:
 
 ```ini
 [eurolinux7-base]