qemu its a emulation system that uses KVM (kernel virual machine) and also are capable of hypervision!
you must check if your CPU support emulation by the command:
grep "vmx|svm" /proc/cpuinfo | uniq, this is necesary for kvm implementation,
if the above command does not show nothing you cannot do such emulation.
apk add bash qemu-img qemu-system-$(uname -m) qemu-modules libvirt-qemu libvirt-daemon eudev-netifnames
grep tun /etc/modules|| echo tun >> /etc/modules
grep vhost_net /etc/modules|| echo vhost_net >> /etc/modules
/bin/bash -c [ -z '$(grep -i intel /proc/cpuinfo|head -n1)' ] && echo AMD || modprobe kvm_intel nested=1 && echo "options kvm_intel nested=Y">/etc/modprobe.d/kvm_intel.conf
/bin/bash -c [ -z '$(grep -i amd /proc/cpuinfo|head -n1)' ] && echo INTEL || modprobe kvm_amd nested=1 && echo "options kvm_amd nested=Y">/etc/modprobe.d/kvm_intel.conf
Warning: the
eudev-netifnamesis only need for compatibility with SHITstemd related script if you will use it
adduser -S -D -g '' -h /var/lib/libvirt qemuvirt
adduser qemuvirt qemu
adduser qemuvirt kvm
modprobe tun && modprobe vhost_net
/usr/bin/qemu-system-$(uname -m) \
-m 256 \
-boot once=d -cdrom alpine-standard-3.12.0-$(uname -m).iso
-net none
-name "alpinebootqemu1"
-enable-kvm
This will boot the alpine iso of the same architecture of the host machine, so
you must have already configured and the iso in the same directory of the
place where you execute the command, if not just give full path!
The adition this time is the -enable-kvm parameter that will bring
improved performance, becouse will use direc hardware of the host machine.
Warning: here we previously configure the program,
The qemu has internal defaults, most of the parameters are just for interaction, but some ones are important for first tries:
sed -i 's|.*vnc_listen.*=.*|vnc_listen = 0.0.0.0|g' /etc/libvirt/qemu.conf
sed -i 's|.*vnc_auto_unix_socket.*=.*|vnc_auto_unix_socket = 1|g' /etc/libvirt/qemu.conf
sed -i 's|.*vnc_tls.*=.*|vnc_tls = 0|g' /etc/libvirt/qemu.conf
sed -i 's|.*vnc_password.*=.*|#vnc_password = "0"|g' /etc/libvirt/qemu.conf
sed -i 's|.*vnc_sasl.*=.*|vnc_sasl = 0|g' /etc/libvirt/qemu.conf
sed -i 's|.*spice_listen.*=.*|spice_listen = 0.0.0.0|g' /etc/libvirt/qemu.conf
sed -i 's|.*spice_auto_unix_socket.*=.*|spice_auto_unix_socket = 1|g' /etc/libvirt/qemu.conf
sed -i 's|.*spice_tls.*=.*|spice_tls = 0|g' /etc/libvirt/qemu.conf
sed -i 's|.*spice_password.*=.*|#spice_password = "0"|g' /etc/libvirt/qemu.conf
sed -i 's|.*spice_sasl.*=.*|spice_sasl = 0|g' /etc/libvirt/qemu.conf
sed -i 's|^.security_driver.*=.*|security_driver = "none"|g' /etc/libvirt/qemu.conf
sed -i 's|.*chardev_tls.*=.*|chardev_tls = 0|g' /etc/libvirt/qemu.conf
sed -i 's|.*vxhs_tls.*=.*|vxhs_tls = 0|g' /etc/libvirt/qemu.conf
sed -i 's|.*nbd_tls.*=.*|nbd_tls = 0|g' /etc/libvirt/qemu.conf
sed -i 's|^.user =.*|user = "general"|g' /etc/libvirt/qemu.conf
sed -i 's|^.group =.*|group = "kvm"|g' /etc/libvirt/qemu.conf
sed -i 's|.*dynamic_ownership =.*|dynamic_ownership = 1|g' /etc/libvirt/qemu.conf
sed -i 's|.*bridge-helper =.*|bridge-helper = "/usr/lib/qemu/qemu-bridge-helper"|g' /etc/libvirt/qemu.conf
sed -i 's|.*vnc_allow_host_audio.*=.*|vnc_allow_host_audio = 1|g' /etc/libvirt/qemu.conf
sed -i 's|.*nographics_allow_host_audio.*=.*|nographics_allow_host_audio = 1|g' /etc/libvirt/qemu.conf
sed -i 's|.*listen_tls =.*|listen_tls = 0|g' /etc/libvirt/libvirtd.conf
sed -i 's|.*unix_sock_group =.*|unix_sock_group = "libvirt"|g' /etc/libvirt/libvirtd.conf
sed -i 's|.*unix_sock_ro_perms =.*|unix_sock_ro_perms = "0750"|g' /etc/libvirt/libvirtd.conf
sed -i 's|.*unix_sock_rw_perms =.*|unix_sock_rw_perms = "0770"|g' /etc/libvirt/libvirtd.conf
sed -i 's|.*auth_unix_ro =.*|auth_unix_ro = "none"|g' /etc/libvirt/libvirtd.conf
sed -i 's|.*auth_unix_rw =.*|auth_unix_rw = "none"|g' /etc/libvirt/libvirtd.conf
sed -i 's|.*tls_no_sanity_certificate =.*|tls_no_sanity_certificate = 1|g' /etc/libvirt/libvirtd.conf
sed -i 's|.*tls_no_verify_certificate =.*|tls_no_verify_certificate = 1|g' /etc/libvirt/libvirtd.conf
sed -i 's|.*allow br.*|allow br0|g' /etc/qemu/bridge.conf
chown -R root:qemu /etc/qemu
chmod 640 /etc/qemu/bridge.conf
adduser -S -D -g '' -h /var/lib/libvirt qemuvirt
adduser qemuvirt qemu
adduser qemuvirt kvm
modprobe tun && modprobe vhost_net
rc-update add libvirtd
rc-update add libvirt-guests
Warning: here we previously configure the program,
If you will have a VM with 4096 Mb of RAM (only one)so then (4096/2)+1024 where the 2048 will be the amount of pages for.. this number will be the amouh of huges pages if your hugepagez configured is 2M, this will leave almost a quarter for other vm of hugepages, so the need hugepages with 2M hugepagez will be 3092
If you will have a VM with 4096 Mb of RAM (only one)so then (4096/1024)+8 where the 8 will be the amount of pages for.. this number will be the amouh of huges pages if your hugepagez configured is 1G, this will leave almost a quarter for other vm of hugepages, so the need hugepages for 1G hugepagez will be 16
Here we will configure hugepages for default system setup, for more deep use ../documents/alpine-newbie-hugepages.md
echo "options vhost max_mem_regions=16" > /etc/modprobe.d/vhost.conf
rmmod tun && rmmod vhost_net && rmmod vhost && modprobe vhost_net && modprobe tun
mount -t hugetlbfs -o rw,pagesize=$(grep Hugepagesize /proc/meminfo|tr -s ' '|cut -d' ' -f 2)k,mode=1770,relatime,gid=$(getent group qemu | cut -d':' -f3) hugetlbfs /dev/hugepages
sed -i 's|.*hugetlbs_mount =.*|hugetlbs_mount = "/dev/hugepages"|g' /etc/libvirt/qemu.conf
service libvirt-guests restart
The mode 17770 will allow to users modify only their own resources
CC BY-NC-SA: the project allows reusers to distribute, remix, adapt, and build upon the material in any medium or format for noncommercial purposes only, and only so long as attribution is given to the creators involved. If you remix, adapt, or build upon the material, you must license the modified material under identical terms, includes the following elements:
For more information check the alpine/copyright.md