RHEL 8 compatibility check

[OndrejHome]

Idea: Check what needs to be changed for fast-vm to run properly on RHEL 8.

TODO

• [x] check firewalling, in default installation the VMs gets IP only when firewalld gets stopped
• [x] figure out how to properly fix the firewall issue
• [x] build custom qemu-kvm package as for RHEL/CentOS 7.x and document in PACKAGING
  • not all dependencies for qemu-kvm seems to be present in Beta repos :/
  • on RHEL 8.0 it is possible to buld qemu-kvm package with some difficulties - https://access.redhat.com/discussions/4342891
• [x] build custom seabios package as for RHEL/CentOS 7.x and document in PACKAGING
  • configuration options seems to changed places - check if the config.seabios-256k is still relevant or if it takes defaults from config.seabios-128k
• [x] update docs/user_guide.txt to reflect any specifics of RHEL8
• [x] test out older images that requires changes qemu-kvm and seabios packages to confirm that they works well

[OndrejHome]

Seems that RHEL 8 contains the libvirt that uses firewalld zones, but it actually doesn't put the custom names interfaces into libvirt zone that allows forwarding of traffic, DHCP and other usual services for NAT libvirt network. There is a short list of 10 most common bridge names defined in the /usr/lib/firewalld/zones/libvirt.xml. For any custom named bridge the following commands are needed to get it into working libvirt zone.

firewall-cmd --zone=libvirt --change-interface=fastvm-nat
firewall-cmd --zone=libvirt --change-interface=fastvm-nat --permanent

[OndrejHome]

As of testing now with RHEL 8.0 it seems that firewall is OK. All packages libvirt-daemon-driver-network.x86_64 starting from version 4.5.0-23.module+el8+2800+2d311f65 seems to be OK.

[OndrejHome]

old images works well even at RHEL/CentOS 8 if there is qemu with megaraid SCSI support. Getting that builded automatically is however quite painful as the COPR seems to be broken for EPEL 8 and qemu related packages. The issue is the missing 'libssh2-devel' which is not accepted even when provided from same repository so there is no nice/easy way to distribute the RPMs that are needed. Still following the PACKAGING document is a way how to build the needed things. As this is not directly impacting fast-vm I will close this issue because this was the last thing on list here.