I recently had a discussion in a container-selinux issue on why we allow certain capabilities by default for containers. The conversation is around DAC_OVERRIDE, a Linux capability which allows privileged processes, usually root, to ignore ownership and read/write permissions Discretionary Access Control (DAC). “As @wrabcak notes in Why do you see DAC_OVERRIDE SELinux denials?, In…
One of the frequent complaints I hear from users moving to Podman is about performance. I’ve always found this confusing, as the Podman team has spent significant time and effort on improving our performance, and we are quite confident that our speed is broadly comparable to Docker. Indeed, an academic paper found that Podman was…
In my personal opinion, user-namespace are one of the most brain-twisting aspects of rootless containers to understand. Arguably right up there with Kubernetes, the learning curve can be quite steep. In this article, I will attempt to reduce that slope for new Podman users (and converts), with an easy to understand analogy. Hopefully this will…
Podman version 4.5 was released upstream last Friday. The latest release brings a large variety of changes including bug fixes and features. Noteworthy ones being: Podman v4.5.0 is available in the stable repos for Fedora 37, 38 and rawhide and should be making its way soon into CentOS Stream and other distributions. So, please give it a…
As Brent announced Netavark v1.6 with DHCP support is released, together with podman v4.5 you can now use DHCP with your macvlan networks in only a few simple steps. In order to use macvlan and DHCP you must run Podman as root. First enable the dhcp proxy via systemd socket: Now just create a macvlan…
In an earlier post, I talked about work that I was starting for Podman machine and its use of Microsoft HyperV. I’m pleased that my first pull request for that enablement was recently merged into Podman. At this point, it is really just about the basics of machine like: creation, removal, start, and stop. >…
Podman runs Linux containers, which depend on a Linux operating system. This means that if a user is on a Mac or Windows, Podman needs to run inside a VM. Most of the time, a standard install of Podman machine just works out of the box. However, when something goes wrong, the complexity of the…
I have been working on adding HyperV as a supported virtualization option for Podman machine. Within the next couple of weeks, I will be looking for folks to test my progress and shake out as many bugs as possible before the code is officially released. If you are familiar with Podman machine and have experience…
Whenever you deal with networking you likely need ips and thus subnets. Podman is no different and uses some default subnets that you should be aware of. This post shows you what these are and how to change them if there is already a subnet in this range on your network. Podman network The default…
Boilerplate walkthrough rootless systemd podman-service, inside a rootless podman container.
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