A veth interface is created for these containers and pod inside a network namespace that is using that bridge, as seen below: $ sudo nmcli connection show It is called cni-podman0 and is given a gateway and a subnet. This is the bridge the rootfull containers use to get their external IPs. Podman's default rootfull network uses the bridge plugin. List the existing Podman networks: $ sudo podman network lsĢf259bab93aa podman 0.4.0 bridge,portmap,firewall,tuning When Podman is installed, a default network is created for it. POD ID NAME STATUS CREATED INFRA ID NAMESĪ28ca9ac0a93 blog Running 50 minutes ago 0158d9f81a96 a28ca9ac0a93-infra,mysql,wordpress 50 minutes ago Up 50 minutes ago 0.0.0.0:8080->80/tcp wordpressĢf988bdf14b5 docker.io/library/httpd:latest httpd-foreground 14 seconds ago Up 14 seconds ago 0.0.0.0:8081->80/tcp httpd Explore a rootfull containers networkįirst of all, using the commands described in the previous article, list the running rootfull containers and pods: $ sudo podman ps -aĬONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESĠ158d9f81a96 /pause:3.5 50 minutes ago Up 50 minutes ago 0.0.0.0:8080->80/tcp a28ca9ac0a93-infraĠ326028545fa docker.io/library/mysql:latest mysqld 50 minutes ago Up 50 minutes ago 0.0.0.0:8080->80/tcp mysqlĦ2cb7ce5c260 docker.io/library/wordpress:latest apache2-foregroun. This article explores both scenarios, starting with the rootfull containers. They can also use network address translation (NAT). This allows them to communicate to each other and the external world using their own IP addresses and a bridged and routed network. In contrast, rootfull containers use the Container Network Interface (CNI) plugins and specifically the bridge plugin. Rootless containers make use of the slirp4netns network mode. Without root privileges, network association is not allowed. To be succinct and simple, when running rootless containers, the container itself does not have an IP address. For a more detailed understanding, I strongly recommend you check the official getting started documentation and tutorials and two other fantastic articles on Podman networking and Podman IP address leasing written by Brent Baude on Enable Sysadmin. However, there are slight differences in how Podman manages rootfull and rootless containers and pods. Podman runs both rootfull and rootless containers, which is a great advantage. A practical introduction to container terminologyīefore getting the container's IPs, it's important to understand some Podman networking concepts.
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