To see information about a KVM node, run
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1 |
virsh nodeinfo |
Example
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root@s3-m12:~# virsh nodeinfo CPU model: x86_64 CPU(s): 8 CPU frequency: 1861 MHz CPU socket(s): 1 Core(s) per socket: 4 Thread(s) per core: 2 NUMA cell(s): 1 Memory size: 16423092 KiB root@s3-m12:~# |
See virsh
virsh command is used to manage KVM vps. It is part of libvirt package.
To list KVM virtual machines, run
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virsh list |
Start a VM
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virsh start VM_ID |
To shutdown a VM, run
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virsh shutdown VM_ID |
To delete a VM, run
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virsh shutdown VM_ID |
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This will take your SSH key.
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boby@fwhlin:~ $ virsh list --all Id Name State ---------------------------------------------------- - vm1 shut off boby@fwhlin:~ $ |
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[root@server70 ~]# virsh list Id Name State ---------------------------------------------------- 1 vm10 running 3 vm12 running 5 vm15 running 7 vm17 running 12 vm16 running [root@server70 ~]# |
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virsh dominfo VM_NAME |
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[root@server70 ~]# virsh dominfo vm18 Id: 10 Name: vm18 UUID: b6c3a3d8-d96a-c3fa-1fad-04aff28e476a OS Type: hvm State: running CPU(s): 2 CPU time: 422.9s Max memory: 524288 KiB Used memory: 524288 KiB Persistent: yes Autostart: disable Managed save: no Security model: none Security DOI: 0 [root@server70 ~]# |
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virsh dumpxml vm18 > vm18.xml virsh shutdown vm18 |
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vi vm18.xml |
Find
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<memory unit='KiB'>524288</memory> <currentMemory unit='KiB'>524288</currentMemory> |
Replace With
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<memory unit='KiB'>1048576</memory> <currentMemory unit='KiB'>1048576</currentMemory> |
Load configuration
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virsh define vm18.xml |
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[root@server70 ~]# virsh define vm18.xml Domain vm18 defined from vm18.xml [root@server70 ~]# |
Start VM
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virsh start vm18 |
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[root@server70 ~]# virsh start vm18 Domain vm18 started [root@server70 ~]# |
See kvm
lxc allow you to take snapshot, restore snapshot of a container.
Here we create a snapshot, then delete the /etc folder from the container. Now the container is useless. Restore the container from snapshot to get it work again.
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root@UNUSED:~# lxc snapshot my-vm-2 my-vm-2-snap1 root@UNUSED:~# lxc exec my-vm-2 -- rm -rf /etc root@UNUSED:~# lxc exec my-vm-2 -- bash I have no name!@my-vm-2:~# ls -l / | grep etc I have no name!@my-vm-2:~# exit root@UNUSED:~# lxc restore my-vm-2 my-vm-2-snap1 root@UNUSED:~# lxc exec my-vm-2 -- bash root@my-vm-2:~# ls -l / | grep etc drwxr-xr-x 89 root root 4096 Aug 27 07:06 etc root@my-vm-2:~# exit root@UNUSED:~# |
LXD is tool to manage LXC (Linux Containers). lxd allow you to create and manage light weight linux containers, it is like docker, but more like an actual virtual machine. LXD is more user friendly than using LXC directly, have more features like clustering of servers.
On Ubuntu/Debian, run
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apt install -y lxd lxd-client |
Before you start using lxd, run
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lxd init |
Just press enter for all questions. Defaults should work. lxd is demaon, only used one time during “lxd init”. After this, you will be using lxc command for everything.
To create a container, run
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lxc launch ubuntu:18.04 vm-1 |
To list all containers, run
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lxc ls |
To stop a VM, run
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lxc stop VM-NAME |
To start VM,
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lxc start VM-NAME |
lxc is Linux Container, allow you to run light weight virtual servers on your computer.
It is better use LXD instead of LXC as LXD provide much easier to use interface to LXC.
To install lxc, run
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apt install -y lxc |
To create a VM, use
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lxc-create -t download -n first-vm |
To list VM, use command lxc-ls
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root@UNUSED:~# lxc-ls first-vm root@UNUSED:~# lxc-ls -f NAME STATE AUTOSTART GROUPS IPV4 IPV6 UNPRIVILEGED first-vm RUNNING 0 - 10.0.3.26 - false root@UNUSED:~# |
To start a VM, run
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lxc-start VM_NAME |
To login to a VM, run
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lxc-attach VM_NAME |
lxc-create is used to create lxc container. To create a container, run
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lxc-create -t download -n CONTAINER_NAME_HERE |
This will list all available containers. You can select the OS you want to use.
To delete a partition in VMWare ESXI, you can use command
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partedUtil |
First find out all disks available on your server using command
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ls /vmfs/devices/disks/ |
On my server, it show following
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[root@ns3048991:~] ls /vmfs/devices/disks/ t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________ vml.01000000004e34473354343459202020202020202020202020484753542048 t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:1 vml.01000000004e34473354343459202020202020202020202020484753542048:1 t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:2 vml.01000000004e34473354343459202020202020202020202020484753542048:2 t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:3 vml.01000000004e34473354343459202020202020202020202020484753542048:3 t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:5 vml.01000000004e34473354343459202020202020202020202020484753542048:5 t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:6 vml.01000000004e34473354343459202020202020202020202020484753542048:6 t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:7 vml.01000000004e34473354343459202020202020202020202020484753542048:7 t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:8 vml.01000000004e34473354343459202020202020202020202020484753542048:8 t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:9 vml.01000000004e34473354343459202020202020202020202020484753542048:9 t10.ATA_____HGST_HUS726020ALA610____________________N4G3TSMY____________ vml.01000000004e34473354534d59202020202020202020202020484753542048 t10.ATA_____HGST_HUS726020ALA610____________________N4G3TSMY____________:1 vml.01000000004e34473354534d59202020202020202020202020484753542048:1 [root@ns3048991:~] |
I want to delete the partition
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t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________:3 vml.01000000004e34473354343459202020202020202020202020484753542048:3 |
To do this, i run
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partedUtil delete "/vmfs/devices/disks/t10.ATA_____HGST_HUS726020ALA610____________________N4G3T44Y____________" 3 |
Here is help for partedUtil
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[root@ns3048991:~] partedUtil Not enough arguments Usage: Get Partitions : get <diskName> Set Partitions : set <diskName> ["partNum startSector endSector type attr"]* Delete Partition : delete <diskName> <partNum> Resize Partition : resize <diskName> <partNum> <start> <end> Get Partitions : getptbl <diskName> Set Partitions : setptbl <diskName> <label> ["partNum startSector endSector type/guid attr"]* Fix Partition Table : fix <diskName> Create New Label (all existing data will be lost): mklabel <diskName> <label> Show commonly used partition type guids : showGuids Get usable first and last sectors : getUsableSectors <diskName> Fix GPT Table interactively : fixGpt <diskName> Show Partition Information : partinfo <diskName> <partNum> Add Partition Information : add <diskName> <label> ["partNum startSector endSector type/guid attr"] [root@ns3048991:~] |
To find vmware version, run
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vmware -l vmware -v |
Example
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[root@dedi-ams-116581:~] vmware -l VMware ESXi 6.5.0 GA [root@dedi-ams-116581:~] vmware -v VMware ESXi 6.5.0 build-4887370 [root@dedi-ams-116581:~] |
To find IP address, run
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[root@dedi-ams-116581:~] hostname -i 51.15.0.152 [root@dedi-ams-116581:~] |
See VMWare esxcli
