added standalone config option for automatic installations

[zackbradys]

Problem:

• Use Case: is being able to install and deploy harvester without any existing infrastructure and no users with the technical ability to do it manually or troubleshoot.
• TLDR: server arrives and user plugs in USB with harvester on it.
• Technical Problem: Unable to complete an harvester.install.automatic=true install of harvester using the ISO due to harvester.install.automatic=true requiring the harvester.install.isoUrl=<isoUrl> which starts a process follow in harv-install geared towards PXE installs.

Solution:

• Added an additional configuration option of harvester.install.standalone=true, which is defaulted false for backwards compatibility, to include an additional check to bypass the harvester.install.isoUrl=<isoUrl> requirement when using harvester.install.automatic=true.
• Happy to modify the configuration option name of standalone to something else... we debated something like harvester.install.automatic.mode=PXE/CD or something similar...

Related Issue:

• https://github.com/harvester/harvester-installer/blob/master/package/harvester-os/files/usr/sbin/harv-install

• harvester-installer/pkg/console/validator.go

  Line 423 in f8a05d7

  if !alreadyInstalled && cfg.Install.Mode != config.ModeInstall && cfg.Install.Automatic && cfg.Install.ISOURL == "" {

Test Plan:

• Create bootable CD or USB with harvester
• Add the following kernel arguments and wait for harvester to boot up...
• $linux ($root)/boot/kernel cdroot root=live:CDLABEL=COS_LIVE rd.live.dir=/ rd.live.squashimg=rootfs.squashfs console=tty1 rd.cos.disable net.ifnames=1 ${extra_iso_cmdline} ip=<ip>::<gateway>:<subnet>:<hostname>:<interface>:none harvester.scheme_version=1 harvester.install.automatic=true harvester.install.standalone=true harvester.install.skipchecks=true harvester.install.mode=create harvester.install.management_interface.method=static harvester.install.management_interface.interfaces='name:<interface>' harvester.install.management_interface.ip=<ip> harvester.install.management_interface.subnetMask=<subnet> harvester.install.management_interface.gateway=<gateway> harvester.install.management_interface.default_route=true harvester.token=Pa22word harvester.os.hostname=<hostname> harvester.os.password=Pa22word harvester.os.ntpServers=<ntp> harvester.os.ntpServers=<ntp> harvester.os.dnsNameservers=<dns> harvester.os.dnsNameservers=<dns> harvester.install.device=/dev/<disk> harvester.install.vip=<vip ip> harvester.install.vipMode=static

[aleiner]

Wanted to share that this PR works in my environment. This is a be a very valuable improvement.