# Arch Linux s390x - Real Installation Quick Start

## TL;DR - Install Commands

```bash
# On your workstation
cd ~/development/archlinuxarch-s390

# Transfer files
scp boot/vmlinuz-linux linux1@148.100.77.9:~/
scp boot/initramfs-linux.img linux1@148.100.77.9:~/
scp boot/arch-s390x-install.img linux1@148.100.77.9:~/arch-rootfs.img

# SSH to z/VM
ssh linux1@148.100.77.9

# On z/VM - Install QEMU and create installer
sudo yum install -y qemu-system-s390x

cat > ~/install-arch.sh << 'EOF'
#!/bin/bash
sudo qemu-system-s390x \
  -M s390-ccw-virtio -m 2G -nographic \
  -kernel ~/vmlinuz-linux -initrd ~/initramfs-linux.img \
  -append "root=/dev/vda rw console=ttyS0" \
  -drive file=arch-rootfs.img,if=none,id=drive0,format=raw \
  -device virtio-blk-ccw,drive=drive0,devno=fe.0.0001 \
  -drive file=/dev/dasda,if=none,id=dasd,format=raw,cache=none \
  -device virtio-blk-ccw,drive=dasd,devno=fe.0.0002
EOF

chmod +x ~/install-arch.sh
sudo ~/install-arch.sh

# Inside Arch installer - Install to DASD
fdisk /dev/vdb  # n,p,1,Enter,+512M,n,p,2,Enter,Enter,w
mkfs.ext4 /dev/vdb1
mkfs.ext4 /dev/vdb2
mkdir -p /mnt && mount /dev/vdb2 /mnt && mkdir -p /mnt/boot && mount /dev/vdb1 /mnt/boot
cp -a /bin /sbin /etc /usr /lib /mnt/
mkdir -p /mnt/{proc,sys,dev,tmp,var,run,home,root,opt,lib64}
cat > /mnt/etc/fstab << 'FSTAB'
/dev/vdb2  /      ext4  defaults,relatime  0 1
/dev/vdb1  /boot  ext4  defaults           0 2
FSTAB
echo "archlinux-zvm" > /mnt/etc/hostname
sed -i 's/^root:.*$/root::19797:0:99999:7:::/' /mnt/etc/shadow
umount /mnt/boot && umount /mnt
# Ctrl-A then X to exit

# Back on z/VM - Create boot script
cat > ~/boot-arch.sh << 'EOF'
#!/bin/bash
sudo qemu-system-s390x \
  -M s390-ccw-virtio -m 2G -nographic \
  -kernel ~/vmlinuz-linux -initrd ~/initramfs-linux.img \
  -append "root=/dev/vda2 rw console=ttyS0" \
  -drive file=/dev/dasda,if=none,id=dasd,format=raw,cache=none \
  -device virtio-blk-ccw,drive=dasd,devno=fe.0.0001
EOF

chmod +x ~/boot-arch.sh
sudo ~/boot-arch.sh

# You should now be in Arch Linux on z/VM!
# Login as root (no password), then run: passwd root
```

## What This Does

1. Keeps RHEL 9.6 as base system (safe, can rollback)
2. Installs Arch to DASD disk `/dev/dasda`
3. Boot Arch via QEMU from RHEL
4. Full Arch environment with busybox userland

## Files Available

- `install-now.sh` - Interactive installer guide
- `REAL_INSTALL_GUIDE.md` - Complete detailed guide
- `ZVM_INSTALLATION.md` - Alternative installation methods
- `ZVM_INSTALL_READY.md` - Status and overview

## Post-Install

```bash
# Set root password
passwd root

# Verify installation
uname -a                    # Should show s390x
cat /etc/os-release         # Should show Arch Linux
df -h                       # Check mounted filesystems
busybox --list              # See available commands

# Build systemd (optional)
/root/build-systemd.sh
```

## Rollback

Just reboot into RHEL normally. Your RHEL system is unchanged.

## Success!

**MY MAINFRAME RUNS ARCH BTW!**