KVM : Install VM Management Tools2021/11/10 |
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Install useful tools for virtual machine management.
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| [1] | Install required packages. |
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[root@dlp ~]# dnf -y install guestfs-tools virt-top
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| [2] | Create a Virtual machine from officially provided images. |
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# display available OS template [root@dlp ~]# virt-builder -l fedora-33 x86_64 Fedora® 33 Server fedora-34 x86_64 Fedora® 34 Server fedora-34 armv7l Fedora® 34 Server (armv7l) fedora-35 x86_64 Fedora® 35 Server ..... ..... # create an image of fedora-35 [root@dlp ~]# virt-builder fedora-35 --format qcow2 --size 10G -o /var/kvm/images/fedora-35.qcow2 --root-password password:myrootpassword
[ 5.8] Downloading: http://builder.libguestfs.org/fedora-35.xz
######################################################################## 100.0%
[ 211.5] Planning how to build this image
[ 211.5] Uncompressing
[ 216.2] Resizing (using virt-resize) to expand the disk to 10.0G
[ 249.6] Opening the new disk
[ 255.1] Setting a random seed
[ 255.1] Setting passwords
[ 256.4] Finishing off
Output file: /var/kvm/images/fedora-35.qcow2
Output size: 10.0G
Output format: qcow2
Total usable space: 10.0G
Free space: 9.0G (90%)
# to create a VM with the image above, run [virt-install]
[root@dlp ~]# virt-install \
--name fedora-35 \
--ram 4096 \
--disk path=/var/kvm/images/fedora-35.qcow2 \
--vcpus 2 \
--os-variant fedora35 \
--network bridge=br0 \
--graphics none \
--noautoconsole \
--boot hd \
--noreboot \
--import
Starting install...
Domain creation completed.
You can restart your domain by running:
virsh --connect qemu:///system start fedora-35
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| [3] | [ls] a directory in a virtual machine. |
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[root@dlp ~]# virt-ls -l -d fedora35 /root total 28 dr-xr-x---. 2 root root 135 Nov 10 00:00 . dr-xr-xr-x. 17 root root 224 Nov 9 23:54 .. -rw-------. 1 root root 16 Nov 10 00:00 .bash_history -rw-r--r--. 1 root root 18 Jul 23 11:53 .bash_logout -rw-r--r--. 1 root root 141 Jul 23 11:53 .bash_profile -rw-r--r--. 1 root root 429 Jul 23 11:53 .bashrc -rw-r--r--. 1 root root 100 Jul 23 11:53 .cshrc -rw-r--r--. 1 root root 129 Jul 23 11:53 .tcshrc -rw-------. 1 root root 872 Nov 9 23:58 anaconda-ks.cfg |
| [4] | cat] a file in a virtual machine. |
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[root@dlp ~]# virt-cat -d fedora35 /etc/passwd root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin lp:x:4:7:lp:/var/spool/lpd:/sbin/nologin sync:x:5:0:sync:/sbin:/bin/sync shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown halt:x:7:0:halt:/sbin:/sbin/halt mail:x:8:12:mail:/var/spool/mail:/sbin/nologin ..... ..... |
| [5] | Edit a file in a virtual machine. |
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[root@dlp ~]# virt-edit -d fedora35 /etc/fstab # # /etc/fstab # Created by anaconda on Tue Nov 9 23:54:03 2021 # # Accessible filesystems, by reference, are maintained under '/dev/disk/'. # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info. # # After editing this file, run 'systemctl daemon-reload' to update systemd # units generated from this file. # /dev/mapper/fedora_fedora-root / xfs defaults 0 0 UUID=00ec6426-bdf4-4246-b0fa-e8523fac7b94 /boot xfs defaults 0 0 |
| [6] | Display disk usage in a virtual machine. |
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[root@dlp ~]# virt-df -d fedora35 Filesystem 1K-blocks Used Available Use% fedora35:/dev/sda1 1038336 159564 878772 16% fedora35:/dev/fedora_fedora/root 15718400 1290552 14427848 9% |
| [7] | Mount a disk for a virtual machine. |
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[root@dlp ~]# guestmount -d fedora35 -i /media [root@dlp ~]# ll /media total 20 lrwxrwxrwx. 1 root root 7 Jul 21 18:47 bin -> usr/bin dr-xr-xr-x. 5 root root 4096 Nov 9 17:57 boot drwxr-xr-x. 2 root root 6 Nov 9 17:54 dev drwxr-xr-x. 100 root root 8192 Nov 9 17:59 etc drwxr-xr-x. 3 root root 20 Nov 9 17:58 home ..... ..... |
| [8] | Display the status of virtual machines. |
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[root@dlp ~]# virt-top virt-top 21:57:15 - x86_64 8/8CPU 2593MHz 15990MB 3 domains, 1 active, 1 running, 0 sleeping, 0 paused, 2 inactive D:0 O:0 X:0 CPU: 0.0% Mem: 1280 MB (1280 MB by guests) ..... ..... |
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