• TODO

TODO

Various Articles

• https://serverfault.com/questions/122042/kvm-online-disk-resize

• https://serverfault.com/questions/378086/how-to-extend-a-linux-pv-partition-online-after-virtual-disk-growth

• https://eioki.eu/2013/07/02/live-resize-libvirt-disk-lvm-multipath (tested and works, no downtime on guest)

• http://www.unixarena.com/2015/12/linux-kvm-how-to-addresize-virtual-disk-on-fly.html

• apt-get install libguestfs-tools to get virt-resize

• https://forum.proxmox.com/threads/extend-rescan-virtio-disk-in-guest-vm.7989/

• debug io trouble: sysstat package + iosat -x 2 5 http://bencane.com/2012/08/06/troubleshooting-high-io-wait-in-linux/ do a page on debugging iostat and how to solve

• http://thomasmullaly.com/2014/11/16/the-list-of-os-variants-in-kvm/

• http://lists.gluster.org/pipermail/gluster-users/2015-February/020798.html

• https://www.linux.com/news/carp-your-way-high-availability

• https://www.server-world.info/en/note?os=Debian_9&p=mariadb&f=1

• http://galeracluster.com/documentation-webpages/sslconfig.html

• http://galeracluster.com/documentation-webpages/sslcert.html

• http://galeracluster.com/documentation-webpages/sslconfig.html#securing-replication-traffic

• http://galeracluster.com/documentation-webpages/sslcert.html

misc

• IOMMU enable: https://us.informatiweb.net/tutorials/it/9-bios/215--enable-iommu-or-vt-d-in-your-motherboard-bios.html

• Mailserver
• Firewall
• Monitoring diskspace
• Network planning
• Keyscript should try thrice
• Create a page about manual DNSs updates and nsupdate
• Spice and TLS write a ssection about spice and TLS, check this to set up the TLS certificates on kvm02 /etc/libvirt/qemu.conf
• KVM guest types are in package osinfo-db
• move gluster07 to dedicated hardware, so the arbiter works as expected.
• Do some pages on optimizations, this is both network, diskio etc. BUT redundancy and stability comes first.
• Do some pages on security, for now redundancy comes first
• virsh capabilities to check what the hardware can do
• debian package, debian-goodies, contains command checkrestart

• spice compression protocols https://libvirt.org/formatdomain.html#elementsGraphics

• describe the use of debian command "virt-host-validate"
• describe installing XP, floppy, and remove floppy when cloning

• https://bugzilla.redhat.com/show_bug.cgi?id=1058526

• describe installing win7, two cdroms, but set up as disks with device=cdrom instead of --cdrom option

• spice protocol https://www.spice-space.org/spice-user-manual.html

• spice clients https://virt-manager.org/download/

• take a look at mandos to boot from encrypted root filesystem
• perhaps we should change to powerdns at some point, since it can run a master/master setup
• delete all crm configuration "rm /var/lib/heartbeat/crm/cib*"

• https://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.cdot-famg-nfs%2FGUID-0D282583-0A6F-4556-AF94-4B08FC5ADDE8.html

• https://wiki.debian.org/OpenStackCephHowto

• ceph, drbd, tahoe-lafs, moosefs, sheepdog, petasan

• bug in virt-clone https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=947150

• https://www.dedoimedo.com/computers/kvm-bridged.html

• https://www.dedoimedo.com/computers/kvm-intro.html --accelerate

• syncthing on central server https://theselfhostingblog.com/posts/how-to-set-up-a-headless-syncthing-network/

• https://wiki.libvirt.org/page/Networking

• https://unix.stackexchange.com/questions/148794/how-to-create-kvm-guest-with-spice-graphics-but-tls-disabled-using-virt-install

• Debian does raid resync on sundays, https://serverfault.com/questions/255544/reason-for-automatic-raid-resync

• https://www.techspot.com/guides/287-default-router-ip-addresses/

• https://www.youtube.com/watch?v=_yIq3GM4gjA

• https://serverfault.com/questions/9708/what-is-a-pem-file-and-how-does-it-differ-from-other-openssl-generated-key-file

alternative bridge settings might be required

# bridging eth0 as br0
auto br0
iface br0 inet dhcp
        # bridge specific settings
        #bridge_stp on
        #bridge_maxwait 0
        #bridge_fd 0
        #bridge_ports eth0
        bridge_ports eth0
        bridge_fd 9
        bridge_hello 2
        bridge_maxage 12
        bridge_stp off
        # network settings

• https://fedoraproject.org/wiki/Xfce

• https://community.volumio.org/t/raspberry-pi-zero-w-and-buildin-bluetooth-chip-not-detected/7312/8

• https://www.youtube.com/watch?v=Ow5rhYTbT34

• spice client for windows systems: https://virt-manager.org/download/

• https://wiki.libvirt.org/page/VNCTLSSetup

• https://libvirt.org/formatdomain.html

• https://unix.stackexchange.com/questions/344756/is-there-anything-similar-to-rsync-to-syncing-block-devices

run that readlink on remote host first

rsync --progress --verbose -I --copy-devices --write-devices --no-whole-file --inplace "$(readlink -f "/dev/vg_storage/kvm_saphira_vda")" kvm01:"$(readlink -f "/dev/vg_storage/kvm_saphira_vda")"

usage example that works

DISK="/dev/vg_storage/kvm_saphira_vda"

SOURCE=$(readlink -f ${DISK})
DESTINATION=$(ssh kvm01 "readlink -f ${DISK}")

echo rsync --progress --verbose -I --copy-devices --write-devices --no-whole-file --inplace ${SOURCE} kvm01:${DESTINATION}
rsync --progress --verbose -I --copy-devices --write-devices --no-whole-file --inplace ${SOURCE} kvm01:${DESTINATION}

host migration

from kvm02 to kvm01

virsh migrate --live --copy-storage-all dhcp02 qemu+ssh://kvm01/system

from kvm01 to kvm02

virsh migrate --verbose --live --copy-storage-all dhcp02 qemu+ssh://kvm02/system

works with the following cpu settings

  <cpu mode='custom' match='exact' check='full'>
    <model fallback='forbid'>Nehalem</model>
    <vendor>Intel</vendor>
    <feature policy='require' name='vme'/>
    <feature policy='require' name='vmx'/>
    <feature policy='require' name='pdcm'/>
    <feature policy='require' name='x2apic'/>
    <feature policy='require' name='tsc-deadline'/>
    <feature policy='require' name='hypervisor'/>
    <feature policy='require' name='arat'/>
    <feature policy='require' name='tsc_adjust'/>
    <feature policy='require' name='umip'/>
    <feature policy='require' name='arch-capabilities'/>
    <feature policy='require' name='rdtscp'/>
    <feature policy='require' name='skip-l1dfl-vmentry'/>
    <feature policy='require' name='pschange-mc-no'/>
  </cpu>

add to the bind description that we can speed bind up by disabling tx and rx offloading in the /etc/network/interfaces file

• up sleep 5; ethtool -K enp1s0 tx off rx off

see more here: https://wiki.debian.org/NetworkConfiguration#A.2Fetc.2Fnetwork.2Finterfaces and here; https://www.linuxquestions.org/questions/linux-networking-3/help-needed-disabling-tcp-udp-checksum-offloading-in-debian-880233/