How to enable nested virtualization for KVM in CentOS/RHEL

 [root@localhost ~]# grep -e 'vmx' /proc/cpuinfo

[root@localhost ~]# grep -e 'svm' /proc/cpuinfo

c:\Program Files\Oracle\VirtualBox>VBoxManage.exe modifyvm RHEL8 --nested-hw-virt on

for old vbox

C:\Program Files\Oracle\VirtualBox>VBoxManage.exe modifyvm kvm --hwvirtex on

[root@localhost ~]# grep -e 'vmx' /proc/cpuinfo

flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc cpuid tsc_known_freq pni pclmulqdq monitor vmx ssse3 cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single pti tpr_shadow vnmi flexpriority vpid fsgsbase avx2 invpcid rdseed md_clear flush_l1d

[[root@localhost ~]# lsmod | grep kvm

kvm_intel             315392  0

kvm                   847872  1 kvm_intel

irqbypass              16384  1 kvm

Battery Health on CLI of CentOS8

    [root@master ~]# yum install upower

    [root@master ~]# upower -i /org/freedesktop/UPower/devices/battery_BAT0

    [root@master ~]# upower -i /org/freedesktop/UPower/devices/battery_BAT0 | grep percentage

    percentage:          12%

    [root@master ~]# vim .bashrc

    [root@master ~]# exec bash

    [root@master ~]# b

    percentage:          12%