Podman : Podman Network2024/05/05

	This is the basic usage to configure Podman Network.
[1]	When running containers without specifying network, default [podman] network is assigned.

# display network list

root@dlp:~#

podman network ls

NETWORK ID    NAME        DRIVER
2f259bab93aa  podman      bridge

# display details of [podman]

root@dlp:~#

podman network inspect podman

[
     {
          "name": "podman",
          "id": "2f259bab93aaaaa2542ba43ef33eb990d0999ee1b9924b557b7be53c0b7a1bb9",
          "driver": "bridge",
          "network_interface": "podman0",
          "created": "2024-05-05T04:14:18.141174746Z",
          "subnets": [
               {
                    "subnet": "10.88.0.0/16",
                    "gateway": "10.88.0.1"
               }
          ],
          "ipv6_enabled": false,
          "internal": false,
          "dns_enabled": false,
          "ipam_options": {
               "driver": "host-local"
          }
     }
]

# [podman] is assigned as container network by default

root@dlp:~#

podman run ubuntu /bin/bash -c "apt-get update; apt-get -y install iproute2; ip route"

.....
.....
default via 10.88.0.1 dev eth0 proto static metric 100
10.88.0.0/16 dev eth0 proto kernel scope link src 10.88.0.2

root@dlp:~#

podman commit $(podman ps -a | tail -1 | awk '{print $1}') srv.world/iproute

[2]	If you'd like to assign another network, configure like follows.

# create network [network01] with [192.168.100.0/24] subnet

root@dlp:~#

podman network create --subnet 192.168.100.0/24 network01

/etc/cni/net.d/network01.conflist

root@dlp:~#

podman network ls

NETWORK ID    NAME        DRIVER
f15ddf0ec1e3  network01   bridge
2f259bab93aa  podman      bridge

# run a container with specifying [network01]

root@dlp:~#

podman run --network network01 srv.world/iproute /usr/sbin/ip route

default via 192.168.100.1 dev eth0 proto static metric 100 e /usr/sbin/ip route
192.168.100.0/24 dev eth0 proto kernel scope link src 192.168.100.3

# to attach the network to existing running container, set like follows

root@dlp:~#

podman ps

CONTAINER ID  IMAGE                            COMMAND               CREATED         STATUS         PORTS                 NAMES
90e6346c401e  srv.world/ubuntu-apache2:latest  /usr/sbin/apachec...  31 seconds ago  Up 31 seconds  0.0.0.0:8081->80/tcp  brave_blackwell

root@dlp:~#

podman exec 90e6346c401e /usr/sbin/ip route

default via 10.88.0.1 dev eth0 proto static metric 100
10.88.0.0/16 dev eth0 proto kernel scope link src 10.88.0.3

# attach network to specify an IP address in the subnet

root@dlp:~#

podman network connect network01 90e6346c401e

root@dlp:~#

podman exec 90e6346c401e /usr/sbin/ip route

default via 192.168.100.1 dev eth1 proto static metric 100
default via 10.88.0.1 dev eth0 proto static metric 100
10.88.0.0/16 dev eth0 proto kernel scope link src 10.88.0.3
192.168.100.0/24 dev eth1 proto kernel scope link src 192.168.100.4

# to disconnect the network, set like follows

root@dlp:~#

podman network disconnect network01 90e6346c401e

root@dlp:~#

podman exec 90e6346c401e /usr/sbin/ip route

default via 10.88.0.1 dev eth0 proto static metric 100
10.88.0.0/16 dev eth0 proto kernel scope link src 10.88.0.3

[3]	To remove podman networks, set like follows.

root@dlp:~#

podman network ls

NETWORK ID    NAME        DRIVER
f15ddf0ec1e3  network01   bridge
2f259bab93aa  podman      bridge

# remove [network01]

root@dlp:~#

podman network rm network01

Error: "network01" has associated containers with it. Use -f to forcibly delete containers and pods: network is being used

# force remove containers with [-f] option

root@dlp:~#

podman network rm -f network01

network01

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