第 6 章 Requesting certificates from a CA and creating self-signed certificates by using RHEL system roles

Procedure

1. Create a playbook file, for example, ~/playbook.yml, with the following content:

   ---
   - name: Create certificates
     hosts: managed-node-01.example.com
     tasks:
       - name: Create a self-signed certificate
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.certificate
         vars:
           certificate_requests:
             - name: web-server
               ca: ipa
               dns: www.example.com
               principal: HTTP/www.example.com@EXAMPLE.COM
               run_before: systemctl stop httpd.service
               run_after: systemctl start httpd.service

   The settings specified in the example playbook include the following:

   name: <path_or_file_name>

   Defines the name or path of the generated private key and certificate file:

   • If you set the variable to web-server, the role stores the private key in the /etc/pki/tls/private/web-server.key and the certificate in the /etc/pki/tls/certs/web-server.crt files.

   • If you set the variable to a path, such as /tmp/web-server, the role stores the private key in the /tmp/web-server.key and the certificate in the /tmp/web-server.crt files.

     Note that the directory you use must have the cert_t SELinux context set. You can use the selinux RHEL system role to manage SELinux contexts.

   ca: ipa

   Defines that the role requests the certificate from an IdM CA.

   dns: <hostname_or_list_of_hostnames>

   Sets the hostnames that the Subject Alternative Names (SAN) field in the issued certificate contains. You can use a wildcard (*) or specify multiple names in YAML list format.

   principal: <kerberos_principal>

   Optional: Sets the Kerberos principal that should be included in the certificate.

   run_before: <command>

   Optional: Defines a command that certmonger should execute before requesting the certificate from the CA.

   run_after: <command>

   Optional: Defines a command that certmonger should execute after it received the issued certificate from the CA.

   For details about all variables used in the playbook, see the /usr/share/ansible/roles/rhel-system-roles.certificate/README.md file on the control node.

2. Validate the playbook syntax:

   $ ansible-playbook --syntax-check ~/playbook.yml

   Note that this command only validates the syntax and does not protect against a wrong but valid configuration.

3. Run the playbook:

   $ ansible-playbook ~/playbook.yml