Miscellaneous stuff

Nothing but random stuff here.

Contents

• ca-setup
  • Simple scripts to setup self-signed CA and certs
• git-setup
  • Basic steps to setup local (test) Git repo infra
• ansible.cfg
  • Ansible configuration file with most relevant settings
• cross_node_ssh.yml
  • Ansible playbook to configure cross-node SSH key authentication
• fedora_init.yml
  • Ansible playbook to initialize a Fedora system after installation
• qcow2-to-box
  • Simple script to create Vagrant boxes from Qcow2 images
• report_local_users.yml
  • Ansible playbook to report local users from systems
• rhel-7-base.ks
  • RHEL 7 base installation kickstart example (see below)
• rhel-8-base.ks
  • RHEL 8 base installation kickstart example (see below)
• rhel-9-base.ks
  • RHEL 9 base installation kickstart example (see below)
• rhel_8_init.yml
  • Ansible playbook to initialize a RHEL 8 system after installation
• rhel_9_init.yml
  • Ansible playbook to initialize a RHEL 9 system after installation
• setup-ansible-gpg-keyring
  • Script to set up Ansible GPG keyring for RH collection signatures
• setup-ansible-venvs
  • Script to set up Ansible/Python venvs for many Ansible versions
• vagrant.ks
  • Kickstart snippet to make Fedora/RHEL installation Vagrant-ready

RHEL 7 Footprint Comparison

The following table illustrates RHEL 7 image footprint with various installation options.

Last updated for RHEL 7.6 Server (later releases may have slightly different characteristics).

1. RHEL Server default installation (using all defaults with the GUI installer)
2. Red Hat RHEL 7 Qcow2 image (from https://access.redhat.com/downloads/) (has no firewalld running)
3. rhel-7-base.ks based kickstart installation
4. "Ultra lean" installation using rhel-7-base.ks with --excludedocs and other %packages options listed, all additional packages listed in %packages section omitted, firewalld, kdump, and tuned services disabled, using network.service and dhclient instead of NetworkManager, auth and firewall directives omitted (due to depending on excluded packages)
5. "Ultra lean" installation with also SELinux disabled

NB. The linux-firmware package takes 176M on disk if installed, it is removed by the kickstart %post script but in case of a kernel update it will be installed again, even if not needed on VMs.

Variant	1	2	3	4	5
RPMs	342	345	267	198	194
Disk usage	1176M	950M	581M	421M	400M
RAM usage	102M	76M	90M	43M	40M

RHEL 8 Footprint Comparison

The following table illustrates RHEL 8 image footprint with various installation options.

Last updated for RHEL 8.0 (later releases may have slightly different characteristics).

See also this RFE for comments about the official RHEL 8 Qcow2 image.

1. RHEL Server default installation (using all defaults with the GUI installer for a Minimal installation)
2. Red Hat RHEL 8 Qcow2 image (from https://access.redhat.com/downloads/) (has no firewalld running)
3. rhel-8-base.ks based kickstart installation
4. "Ultra lean" installation using rhel-8-base.ks with --excludedocs and other %packages options listed, all additional packages listed in %packages section omitted, firewalld, kdump, and tuned services disabled, using network.service and dhclient instead of NetworkManager, authselect and firewall directives omitted (due to depending on excluded packages)
5. "Ultra lean" installation with also SELinux disabled (see https://bugzilla.redhat.com/show_bug.cgi?id=1660142)

NB. The linux-firmware package takes 291M on disk if installed, it is removed by the kickstart %post script but in case of kernel update it will be installed again, even if not needed on VMs.

See also this RFE for discussion to possibly change RHEL firmware packages as weak dependencies for RHEL 8 kernel.

Variant	1	2	3	4	5
RPMs	406	437	330	232	226
Disk usage	1491M	1279M	709M	515M	463M
RAM usage	179M	148M	161M	103M	70M

See Also

See also https://github.com/myllynen/rhel-image.

See also https://github.com/myllynen/ansible-packer.

See also https://github.com/myllynen/rhel-ansible-roles.

License

GPLv2+