构建Xen实例之创建Dom0

[root@rebekk ~]# cat /etc/yum.repos.d/xen48.repo
[xen48]
name=Xen4.8 on Aliyun
baseurl=https://mirrors.aliyun.com/centos/7/virt/x86_64/xen-48/
gpgcheck=0
enabled=1

[root@rebekk ~]# yum update
[root@rebekk ~]# yum install xen

[root@rebekk ~]# vim /etc/default/grub

GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
GRUB_DEFAULT=saved
GRUB_DISABLE_SUBMENU=true
GRUB_TERMINAL_OUTPUT="console"
GRUB_CMDLINE_LINUX="crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"
GRUB_DISABLE_RECOVERY="true"
GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M,max:1024M dom0_max_vcpus=2 dom0_vcpus_pin=true cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all"
GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT="console=hvc0 earlyprintk=xen nomodeset"

[root@rebekk ~]# bash $(which grub-bootxen.sh)
[root@rebekk ~]# reboot

[root@rebekk ~]# uname -a
Linux rebekk 4.9.215-36.el7.x86_64 #1 SMP Mon Mar 2 11:42:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
[root@rebekk ~]# uname -r
4.9.215-36.el7.x86_64
[root@rebekk ~]# xl list
Name                                        ID   Mem VCPUs	State	Time(s)
Domain-0                                     0  1024     2     r-----      51.4

# 通过xl info命令可以查看底层硬件平台（Xen Hypervisor）的一些信息，如总内存（total_memory）、空闲内存（free_memory）等
[root@rebekk ~]# xl info
host                   : rebekk
release                : 4.9.215-36.el7.x86_64
version                : #1 SMP Mon Mar 2 11:42:52 UTC 2020
machine                : x86_64
nr_cpus                : 1
max_cpu_id             : 127
nr_nodes               : 1
cores_per_socket       : 1
threads_per_core       : 1
cpu_mhz                : 3599
hw_caps                : 078bfbff:f7fa3223:2c100800:00000121:0000000f:009c27ab:00000000:00000100
virt_caps              : hvm
total_memory           : 2047
free_memory            : 998
sharing_freed_memory   : 0
sharing_used_memory    : 0
outstanding_claims     : 0
free_cpus              : 0
xen_major              : 4
xen_minor              : 8
xen_extra              : .5.86.g8db85532
xen_version            : 4.8.5.86.g8db85532
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : 
xen_commandline        : placeholder dom0_mem=1024M,max:1024M dom0_max_vcpus=2 dom0_vcpus_pin=true cpuinfo com1=115200,8n1 console=com1,tty loglvl=all guest_loglvl=all
cc_compiler            : gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39)
cc_compile_by          : mockbuild
cc_compile_domain      : centos.org
cc_compile_date        : Thu Dec 12 15:10:22 UTC 2019
build_id               : 758b32738223bc21223741bec488a75ce4f823ab
xend_config_format     : 4