Podman Installation on Ubuntu 20.04 WSL2

podman-installation-on-ubuntu-2004-wsl2.md

Podman Installation on Ubuntu 20.04 WSL2

Execute the following command to install Podman:

sudo apt update
sudo apt install ca-certificates
. /etc/os-release
echo "deb https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/ /" | sudo tee /etc/apt/sources.list.d/devel:kubic:libcontainers:stable.list
curl -L https://download.opensuse.org/repositories/devel:/kubic:/libcontainers:/stable/xUbuntu_${VERSION_ID}/Release.key | sudo apt-key add -
sudo apt update
sudo apt -y upgrade
sudo apt -y install podman

Execute podman info to initialize rootless Podman:

podman info

Execute the following command to create /etc/containers/containers.conf based on sample config:

sudo cp -v /usr/share/containers/containers.conf /etc/containers/

In /etc/containers/containers.conf file, change the following values (make sure these lines are not commented):

1. Change cgroup_manager = "systemd" to cgroup_manager = "cgroupfs"
2. Change events_logger = "journald" to events_logger = "file"
3. Increase ulimits to 65535 and make memlock unlimited:

[containers]
default_ulimits = [ 
  "nofile=65535:65535",
  "memlock=-1:-1"
]

Since ulimit config above only works for rootful Podman, it will cause a permission error when running on rootless Podman. To prevent this error, create an empty default_ulimits in ~/.config/containers/containers.conf file:

[containers]

default_ulimits = []

Allow IPv4 forwarding and ping in /etc/containers/containers.conf:

[containers]
default_sysctls = [
 "net.ipv4.ping_group_range=0 0",
 "net.ipv4.ip_forward=1"
]

In /etc/sysctl.conf, make sure vm.max_map_count is set to at least 262144:

vm.max_map_count=300000

To apply vm.max_map_count without reboot, execute the following command:

sudo sysctl -w vm.max_map_count=300000