Difference between revisions of "Scratch Pad"
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Revision as of 16:34, 27 June 2019
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCdb8jlXYrXctIM1Uo1CKqFlJewz2oCVTEqMnAuBrD4QM7rrudTjLQSBI9qJ0tELDEAQ7kGLG98VWtbhQE0WfSqlSrxxh9kfnyiouIX9PE T2/58XimaVcV90LpPTeK453cbusvny2JEdPSusZpT1RhIGhdIKma8VZzG0ZX/PkwNgtO5x8/ogOwMWbmg7E3JcV9OGRyXJX/BBKlOcHSFyjtlMgUOapS/uK2OXRaNi4pNdplitLGSliGIU/ 65amxoI3+XfDMtoamboRQqR5/JeQrrgQgdfbq3VJPiK7JB5ycueRFgaJSgkANCRBgKqLzvfvHr3UTXH+EdqSPZInXIb1mJ george2@george2-VirtualBox https://www.ebay.co.uk/b/yama-buggy-parts/bn_7024825240 https://www.ebay.co.uk/itm/Yama-2-stroke-1-5-scale-Petrol-RC-buggy-front-wheel-1-pair-/163665921047 https://www.youtube.com/watch?v=A1zmhxcUOxw [21/06/2018 15:36] Olly Bellamy: What Ports are Connected to What? 172.16.112.232 2306 Te 1/53/1 172.16.112.233 2306 Te 1/53/2 172.16.112.234 2306 Te 1/53/1 172.16.112.235 2306 Te 1/53/2 172.16.112.236 - - 172.16.112.237 - - Does SO-4048 serve data AND iscsi? No, just iscsi. Does the SAN management network run through the SO-4048? Yes. This may help https://community.jisc.ac.uk/library/janet-services-documentation/payments-and-charges
Chapters
2 [[#chap2essentialtools|]]Using essential tools
3. Essential File Management Tools
5. Connecting to Red Hat Linux 7
10. Working with Virtual Machines
11. Installing Software Packages
15. Managing LVM Logical Volumes
17. Configuring a Basic Apache Server
1. Red Hat Installation
2. Using Essential Toosl
3. Essentila File Management Tools
4. Working with text files
5. Connecting to Red Hat Linux 7
6. User and Group Management
7. Permissions Management
8. Configuring Networking
9. Process Management
10. Working with Virtual Machines
QEMU (Quick Emulator) this does the disk format of image files.
It offers an infrastructural server that consists of multiple hypervisor nodes
that are managed from a central RHEV Manager node, on which a web user interface
makes managing a complex environment easy.
To access VMs that are offered through KVM, you use libvirtd. Libvirtd is a process
that sits between the virtualization layer and the application that an administrator
is using to access the VMs. Without libvirtd, you cannot manage VMs. Virtual
machine management options also are configured through the libvirtd configuration
file /etc/libvirt/libvirtd.conf.
Although the method to connect remotely directly to libvirtd works well and is convenient
for hypervisors that have a minimal number of software packages installed,
alternatively you can use Secure Shell (SSH) from virt-manager to connect to
remote libvirtd processes.
If you are experiencing problems accessing VMs, libvirtd is the primary suspect,
and you should at least ensure that it is running, by using the systemctl status -l
libvirtd command. In Listing 10.1 , you can see how this command shows that libvirtd
is running; the command also shows information about recent activity on the
process .
systemctl status -l libvirtd
Making your server a KVM host.
cat /proc/cpuinfo - vmx on an intel CPU, and svm on an AMD CPU.
cat /proc/cpuinfo | egrep ‘svm|vmx’
yum groupinstall “Virtualization Host â€.
/var/lib/libvirt/images. - check space
NOTE As an alternative to working with disk image files, you may prefer working
with LVM logical volumes as the storage backend. This offers some advantages,
such as the possibility to easily create backups by using the LVM snapshot feature.
For this reason, LVM is often used as a storage backend in production KVM
servers.
KVM Host networking
brctl show
Accessing virtual machines
â– SSH into the VM
â– Through Virtual Machine Manager
â– Through GNOME Boxes
â– Using virt-viewer
â– Optionally, through third-party utilities.
Accessing virtual Machines from a text only console.
This is from the KVM host
grubby --update-kernel=ALL --args=“console=ttyS0â€
reboot the vm
virsh console samder-vm1
Managing virtual machines from the command line
virsh commands
list = active vms
list -all = all, including non active
help
shutdown <vmname> shuts down properly
destroy <vmname> pulls the power plug
edit <vmname> edit the xml config file.txt
console <vmname> connects from KVM host console
start <vmname> Starts a VM
reboot <vmname> reboots a vm
Google
virsh list [ --inactive | --all]
From Red Hat Portal - managing guests
help Prints basic help information. list Lists all guests. dumpxml Outputs the XML configuration file for the guest. create Creates a guest from an XML configuration file and starts the new guest. start Starts an inactive guest. destroy Forces a guest to stop. define Outputs an XML configuration file for a guest. domid Displays the guest's ID. domuuid Displays the guest's UUID. dominfo Displays guest information. domname Displays the guest's name. domstate Displays the state of a guest. quit Quits the interactive terminal. reboot Reboots a guest. restore Restores a previously saved guest stored in a file. resume Resumes a paused guest. save Save the present state of a guest to a file. shutdown Gracefully shuts down a guest. suspend Pauses a guest. undefine Deletes all files associated with a guest. migrate Migrates a guest to another host.
Misc : version Displays the version of virsh nodeinfo Outputs information about the hypervisor
Reset root password
append the following to the linux16 line at grub - init=bin/sh then control-x
11. Installing Software Packages
12. Scheduling Tasks
13. Configuring Logging
14. Managing Partitions
15. Managing LVM Logical Volumes
16. Basic Kernel Management
17. Configuring a Basic Apache Server
