KVM



Kernel based Virtulization.


Provided in all Linux type OS, with built in packages , like to jave KVM in RHEL6

 yum install qemu-kvm qemu-img

 These packages provide the user-level KVM emulator and disk image manager on the host Red Hat Enterprise Linux system
# yum install virt-manager libvirt libvirt-python python-virtinst libvirt-client

python-virtinst:
Provides the virt-install command for creating virtual machines.
libvirt:

to talk to RHEL KVM, via commands like "libvirtd" to VM mamager


#virt-mamager & 

a graphical tool of KVM to manage the VMS

With virt-manager,  graphically step  by step wizard, you can create VMs, provide image , choose type of OS,.

Take snapshot, revert back on any image, it's like a VCenter.


#Daemon

#libvirtd 


use other commands on host mamanger like 


#virsh list --all
#virsh domaininfo <vmname> // info and confi of your vm

 

Comments

Post a Comment

Popular posts from this blog

Basics of networking : Model,Router,firewall,Switch, wireless access points

Image
Router: Layer 3 device of OSI model, deals with communication via IP address, Private Network, public network etc. routing protocols OSPF, etc are used, with concepts like routing tables. DNS: Domain Name server DHCP: Dynamic Host Configuration Protocol ======================================================================== NETWORKS , SUBNETWORKS and ROUTE                                   ROUTING TABLE  Destination     Gateway         Genmask         Flags Metric Ref    Use Iface default             gateway             0.0.0.0         UG    100    0        0 em2 15.15.0.0       10.10.4.99      255.255.255.0   UG     0      0        0 em3 ESSENCE of routing table : Which is the next HOP/Router for the current packet. How it decides ? it looks at current packet's destination address, say 15.15.0.1, it search for all Destination IP and Subnet, its does AND Operation of "Destination" and  "Genmask" to see, if it
Read more

RAN | O-RAN | Open RAN | Open Radio Access Network | Layers |

Image
 RAN Elements  Antennas  convert electrical signals into radio waves. Radios  transform digital information into signals that can be sent wirelessly and ensure that transmissions are in the correct frequency bands with the right power levels. Baseband units ( BBUs )  provide a set of signal processing functions that make wireless communication possible. Traditional baseband uses custom electronics combined with multiple lines of code to enable wireless communication, typically using the licensed radio spectrum. BBU processing detects errors, secures the wireless signal and ensures that wireless resources are used effectively. RAN Radio Resources  Radio Resources Management Techniques  Power control, scheduling, cell search, cell reselection, handover, radio link or connection monitoring, and connection establishment and re-establishment. bearer selection (Master Cell Group (MCG),  bearer, Secondary Cell Group (SCG) bearer, Split bearer),       Major factors for RAN capabilities Channel
Read more

Linux command

  ============NETSTAT============= On .80 machine tcp6       0      0 10.10.4.80:44016        15.15.0.1:3083          ESTABLISHED Here local port 10.10.4.80:44016 is connected with remote 15.15.0.1:3083 On .99 machine tcp6       0      0 15.15.0.1:3083          10.10.4.80:44016        ESTABLISHED tcp6       0      0 15.15.0.1:3083          :::*                    LISTEN and is listening from any connection from any ip and port from outside, so its a server socket on .99 ===================TCP DUMP================ tcpdump -vv -X -i em3 'port 44016' -w dump.log ========================DF =================== Filesystem               Size  Used Avail Use% Mounted on devtmpfs                 252G     0  252G   0% /dev tmpfs                    252G  4.0K  252G   1% /dev/shm tmpfs                    252G  652M  252G   1% /run tmpfs                    252G     0  252G   0% /sys/fs/cgroup /dev/mapper/centos-root  1.8T  4.8G  1.7T   1% / /dev/loop0               1.9G  6.1M  1.7G   1% /sr
Read more