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Podman and Libvirt

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Software distribution

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Packages

• RPM
• yellow package (pkg)
• Installshield installer (msi)
• .war

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Containers and virtual machines

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Reasons

• increased security*
• ease of distribution
• consistency in deployment
  • software appliance

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Docker

$ alias docker=podman

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Podman

 open platform for developing, shipping, and running applications

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Podman

a runtime to run 'containers'

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Containerfile

Describes the environment the application runs in

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Syntax and commands

FROM ...

RUN ...

COPY ...

CMD ...

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Build

$ podman build

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Apache container using Fedora

FROM fedora:39

RUN dnf install -y httpd && \
    systemctl enable httpd.service
    # Note: remove temp

EXPOSE 80

#CMD ["/usr/sbin/httpd"]
CMD ["/usr/sbin/init"]

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Build

$ podman build -t httpd-example .

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Run

$ podman run -d --rm --systemd=always -p 8080:80 httpd-example
$ links http://localhost:8080
$ podman ps -a

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Interactive

$ podman run -it --rm fedora:39 bash
# uname -a
Linux ... x86_64 GNU/Linux

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Publishing

Container registry

$ podman pull
$ podman push
$ podman tag

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Libvirt

A virtualization API to control a Hypervisor

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KVM

an open source virtualization technology built into Linux

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Create a VM

$ virsh create rhel9vm.xml

...

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Virt-install

$ virt-install \
   -n RHEL9VM \
   --description "Test VM" \
   --os-type=Linux \
   --os-variant=rhel9 \
   --ram=4096 \
   --vcpus=2 \
   --disk path=/var/lib/libvirt/images/RHEL9VM.img,bus=virtio,size=10 \
   --graphics none \
   --cdrom /var/libvirt/images/rhel9.iso \
   --network bridge:br0

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Use Cockpit

...

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Let's leave at this ...

this is all you need to know about VMs

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