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unix:virtualization:kvm:server [2020/10/17 00:40] rodolicounix:virtualization:kvm:server [2022/05/19 02:13] (current) rodolico
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 You should see either vmx or svm in the output. You should see either vmx or svm in the output.
  
-Now, install the basic packages needed, a couple of utilities, but not all the extra crud.+Now, install the basic packages needed, a couple of utilities, but not all the extra crud. //netcat-openbsd// is only needed if you're going to cluster and migrate virtuals from one hypervisor to another, from what I can tell. **virt-top** is a nice little //top// for seeing what is running and what resources they are using in real time.
  
 <code bash> <code bash>
-apt install -y --no-install-recommends qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils libguestfs-tools genisoimage virtinst libosinfo-bin virt-top+apt install -y --no-install-recommends qemu-kvm libvirt-clients libvirt-daemon-system bridge-utils libguestfs-tools genisoimage virtinst libosinfo-bin virt-top netcat-openbsd
 reboot # brings libraries online reboot # brings libraries online
 </code> </code>
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 I'm lazy, so I just created all three, then imported them all at one time. I'm lazy, so I just created all three, then imported them all at one time.
  
-<code xml br_wan.xml+<code bash import_bridge.sh
-<network> +#! /usr/bin/env bash
-  <name>br_wan</name> +
-  <forward mode="bridge"/+
-  <bridge name="br_wan"/+
-</network> +
-</code>+
  
-<code xml br_dmz.xml+# create the xml definitionsThe br is prepended.  
-<network> +# Add/remove interfaces if needed 
-  <name>br_dmz</name> +for interface in wan lan dmz 
-  <forward mode="bridge"/> +do  
-  <bridge name="br_dmz"/> +cat << EOF br_$interface.xml 
-</network> +       <network> 
-</code>+         <name>br_$interface</name> 
 +         <forward mode="bridge"/> 
 +         <bridge name="br_$interface"/> 
 +       </network> 
 +EOF 
 +done 
 +# uncomment this if you want to view your xml files but 
 +# not process them 
 +# exit
  
-<code xml br_lan.xml> 
-<network> 
-  <name>br_lan</name> 
-  <forward mode="bridge"/> 
-  <bridge name="br_lan"/> 
-</network> 
-</code> 
  
-And imported them all at once.+# find all xml files and do the net-define 
 +for interface in `ls *.xml` 
 +do 
 +   virsh net-define --file $interface 
 +done
  
-<code bash> +# since the bridge name is followed by xml, simply remove that 
-for interface in `ls *.xml` ; do virsh net-define --file $interface ; done +# and set to autostart and start it 
-for interface in `ls *.xml | cut -d'.' -f1` do virsh net-autostart $interface virsh net-start $interface done+for interface in `ls *.xml | cut -d'.' -f1` 
 +do  
 +   virsh net-autostart $interface  
 +   virsh net-start $interface 
 +done 
 +# show me the list of network names
 virsh net-list virsh net-list
 </code> </code>
  
-After the last command, you should see your three interfaces defined. That means you can now use them.+This script assumes your network names are of the form br_//something// and it creates the file name as br_//something//.xml. It then looks for all XML files (so, you don't want any others in the current directory), the processes them
 + 
 +The last loop assumes there are no periods in the network name. Be warned.
  
 ===== Using Storage ===== ===== Using Storage =====
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 <code bash> <code bash>
-virt-install                   +virt-install \ 
-   --hvm                       \+   --hvm \
    --connect    qemu:///system \    --connect    qemu:///system \
-   --name       router-a       +   --name       router-a \ 
-   --memory     4096           +   --memory     4096 \ 
-   --vcpus      4              +   --vcpus      4 \ 
-   --disk       path=/dev/vg0/router-a.disk0,bus=scsi              +   --disk       path=/dev/vg0/router-a.disk0,bus=virtio,target=sda 
-   --graphics vnc,port=5901                                         +   --graphics vnc,port=5901 \ 
-   --noautoconsole                                                  \+   --noautoconsole \
    --cdrom     /media/xen-store/OPNsense-20.1-OpenSSL-dvd-amd64.iso \    --cdrom     /media/xen-store/OPNsense-20.1-OpenSSL-dvd-amd64.iso \
-   --os-variant freebsd11.1                                             \+   --os-variant freebsd11.1 \
    --metadata uuid=d9510e01-e461-461f-9aa8-3cee223cb4a0,name=router-a,title=router-a,description='Primary Router' \    --metadata uuid=d9510e01-e461-461f-9aa8-3cee223cb4a0,name=router-a,title=router-a,description='Primary Router' \
-   --boot     hd,cdrom,menu=on                                      +   --boot     hd,cdrom,menu=on \ 
-   --network  bridge=br_wan,mac=00:16:3e:bd:26:70                      +   --network  bridge=br_wan,mac=00:16:3e:bd:26:70,model=virtio 
-   --network  bridge=br_dmz,mac=00:16:3e:bd:26:71                   +   --network  bridge=br_dmz,mac=00:16:3e:bd:26:71,model=virtio 
-   --network  bridge=br_lan,mac=00:16:3e:bd:26:72+   --network  bridge=br_lan,mac=00:16:3e:bd:26:72,model=virtio
 </code> </code>
  
-Other usefull options are+Other useful options are
   * --dry-run # don't really do it   * --dry-run # don't really do it
   * --controller virtio-scsi # this is specific to KVM, but faster there   * --controller virtio-scsi # this is specific to KVM, but faster there
   * osinfo-query os # this shows the OS's available for the --os-variant flag   * osinfo-query os # this shows the OS's available for the --os-variant flag
 +
 +most of the parameters are self evident, but I'll quickly talk about why I did some of them.
 +
 +  * --graphics vnc,port=5901 - Our servers are headless and have no GUI. I want to be able to connect during install using VNC. By defining the port here, it is not auto-selected (and changeable) across boots
 +  * --noautoconsole - When starting the virtual, virt-lib tries to bring up a GUI for virtviewer to take over, or run virsh console to bring up a serial console. Since I don't want either, I disable it here
 +  * --os-variant freebsd11.1 - By defining this, virt-install can set up some defaults that work well with the known OS.
 +  * --metadata uuid=d9510e01-e461-461f-9aa8-3cee223cb4a0,name=router-a,title=router-a,description='Primary Router'
 +    * title, name and description will show up in some reports. 
 +    * uuid is good so the virtual does not get a new, randomly generated UUID every time it runs. Use the uuidgen command to get a randomly generated one for each new machine
 +
 +===== Performing Installation =====
 +
 +For most systems, I use VNC to do the install. Since I'm remote, I use the following ssh command:
 +<code bash>ssh -L localhost:5910:localhost:5901 server</code>
 +where 
 +  * 5910 is the local VNC port I'll attach to (ie, localhost:5910)
 +  * 5901 is the VNC port I told virt-install to use
 +  * server is the name of the hypervisor
 +
 +Then, when I run the virt-install command, I simply make a VNC connection to localhost:5910 and can do my install.
 +
 +===== Setting other parameters =====
 +
 +If you want the domain to come up automatically when the hypervisor is turned on, the autostart flag needs to be set. Do this with <code bash>virsh autostart domainname</code>
 +
 +===== Links =====
 +  * https://www.cyberciti.biz/faq/install-kvm-server-debian-linux-9-headless-server/
 +  * https://www.techotopia.com/index.php/Managing_KVM_on_RHEL_6_using_the_virsh_Command-line_Tool
 +  * https://computingforgeeks.com/virsh-commands-cheatsheet/
 +  * https://serverfault.com/questions/350806/convert-libvirt-xen-configuration-to-native
 +  * https://libvirt.org/sources/virshcmdref/html/
 +  * https://www.utappia.org/2016/04/how-to-migrate-your-virtual-box.html (migrate virtualbox images to kvm qcow2)
 +  * https://serverfault.com/questions/627238/kvm-libvirt-how-to-configure-static-guest-ip-addresses-on-the-virtualisation-ho#627245 (set sticky IP's on KVM)
 +
 +
unix/virtualization/kvm/server.txt · Last modified: 2022/05/19 02:13 by rodolico