View source for Qemu-simple

{{Verified|1}}
== Setup walkthrough ==
Basic setup that gets you going, you would still need to read main Qemu documentations for advanced features.

=== Objective ===
# Install Alpinelinux.
# Install Qemu and its dependencies.
# Download Alpinelinux ISO and required files.
# Start a Qemu instance of Alpinelinux ISO.
# Test basic networking.

=== Test bed ===
{{Pill||WIP|goldenrod|yellow}}
* Describe here the test bed/setup used to run the scripts below.
# MODEL: Dell Laptop.
# CPU: Intel i5 3rd/4th generation with virtualization enabled.
# RAM: 8GB

==== Install Alpinelinux ====
# Diskless installs (Ram based)
# SYS installs

{{tip| - for further setup to work correctly, its assumed that alpinelinux installed in done for version between ''v3.21.x and v3.22.x''}}

{{Pill||v3.21.x-v3.22.x|cadetblue|lightblue}}
==== Install Qemu and its dependencies ====
{{Cmd2|# apk add qemu qemu-img qemu-system-x86_64 qemu-ui-gtk }}
{{Cmd2|# modprobe tun }}

{{Pill||v3.21.x-v3.22.x|cadetblue|lightblue}}
==== Download Alpinelinux ISO and required files ====
{{Cmd2| # cd ~
 # wget https://cdn.alpinelinux.org/v3.22/releases/x86_64/alpine-extended-3.22.0-x86_64.iso
}}

==== Start a Qemu instance of Alpinelinux ISO ====
# Basic setup (with ssh forwarding)
# Basic tap setup

{{Pill||v3.21.x-v3.22.x|cadetblue|lightblue}}
===== Basic setup (with ssh forwarding) =====
<pre>
#!/bin/sh
## -------------------------------------------------
## Simple setup (manually)
##  no root privileges needed
## QEMU emulator version 10.0.0 (alpinelinux) ####
## -------------------------------------------------
ISO=alpine-extended-3.22.0-x86_64.iso
qemu-system-x86_64 -enable-kvm -m 2048M -cdrom ${ISO} \
    -device virtio-net,netdev=net0 \
    -netdev user,id=net0,hostfwd=tcp::5555-:22 \
    -nographic -display curses \
    -boot d

## ----
## on GUEST
# ifconfig eth0 10.0.2.15
# route add default gw 10.0.2.2
# busybox ping alpinelinux.org
## -------------------------------------------------
</pre>

{{Pill||v3.21.x-v3.22.x|cadetblue|lightblue}}
===== Basic tap setup =====
<pre>
#!/bin/sh
## -------------------------------------------------
## Manual setup with defaults and no preset scripts
## Works in root
## QEMU emulator version 10.0.0+ (alpinelinux) ####
## modprobe tun # needed if not loaded already
## -------------------------------------------------
ISO=alpine-extended-3.22.0-x86_64.iso
qemu-system-x86_64 -enable-kvm -m 2048M -cdrom ${ISO} \
    -device virtio-net,netdev=nd0 \
    -netdev tap,id=nd0,ifname=tap0,script=no,downscript=no \
    -nographic -display curses \
    -boot d

## ----
## on HOST
# ifconfig tap0 10.0.2.2
## on GUEST
# ifconfig eth0 10.0.2.15
# route add default gw 10.0.2.2
## ----
## TEST (HOST) - IMPORTANT: remove firewall if any
# nc -l 1234 > filename.out
## TEST (GUEST)
# echo -e "aaa\nbbb" > test.txt
# nc 10.0.2.2 1234 < test.txt
## TEST (HOST)
# cat filename.out
## -------------------------------------------------
</pre>

== See also ==
* [[LXC_Alpinelinux_Simple]]

== Resources ==
# https://wiki.alpinelinux.org/wiki/QEMU
# https://wiki.qemu.org/Documentation/Networking#How_to_get_SSH_access_to_a_guest
# https://www.qemu.org/docs/master/system/invocation.html#hxtool-5
# https://manned.org/pkg/alpine-3.22/qemu-doc