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libpod Installation Instructions

Prerequisites

runc installed

The latest version of runc is expected to be installed on the system. It is picked up as the default runtime by podman.

conmon installed

The latest version of conmon is expected to be installed on the system. Conmon is used to monitor OCI Runtimes.

Setup CNI networking

A proper description of setting up CNI networking is given in the cni README. But the gist is that you need to have some basic network configurations enabled and CNI plugins installed on your system.

Build and Run Dependencies

Required

Fedora, CentOS, RHEL, and related distributions:

yum install -y \
  atomic-registries \
  btrfs-progs-devel \
  conmon \
  containernetworking-cni \
  device-mapper-devel \
  git \
  glib2-devel \
  glibc-devel \
  glibc-static \
  go \
  golang-github-cpuguy83-go-md2man \
  gpgme-devel \
  iptables \
  libassuan-devel \
  libgpg-error-devel \
  libseccomp-devel \
  libselinux-devel \
  make \
  ostree-devel \
  pkgconfig \
  runc \
  skopeo-containers

Debian, Ubuntu, and related distributions:

apt-get install -y \
  btrfs-tools \
  git \
  golang-go \
  go-md2man \
  iptables \
  libassuan-dev \
  libdevmapper-dev \
  libglib2.0-dev \
  libc6-dev \
  libgpgme11-dev \
  libgpg-error-dev \
  libprotobuf-dev \
  libprotobuf-c0-dev \
  libseccomp-dev \
  libselinux1-dev \
  pkg-config

Debian, Ubuntu, and related distributions will also need to do the following setup:

NOTE

If using an older release or a long-term support release, be careful to double-check that the version of runc is new enough (running runc --version should produce spec: 1.0.0), or else build your own.

Be careful to double-check that the version of golang is new enough, version 1.8.x or higher is required. If needed, golang kits are available at https://golang.org/dl/

Optional

Fedora, CentOS, RHEL, and related distributions:

(no optional packages)

Debian, Ubuntu, and related distributions:

apt-get install -y \
  libapparmor-dev

Get Source Code

As with other Go projects, PODMAN must be cloned into a directory structure like:

GOPATH
└── src
    └── github.com
	└── containers
	    └── libpod

First, configure a GOPATH (if you are using go1.8 or later, this defaults to ~/go) and then add $GOPATH/bin to your $PATH environment variable.

export GOPATH=~/go
mkdir -p $GOPATH
export PATH=$PATH:$GOPATH/bin

Next, clone the source code using:

mkdir -p $GOPATH/src/github.com/containers
cd $_ # or cd $GOPATH/src/github.com/containers
git clone https://github.com/containers/libpod # or your fork
cd libpod

Build

make install.tools
make
sudo make install

Otherwise, if you do not want to build podman with seccomp support you can add BUILDTAGS="" when running make.

make BUILDTAGS=""
sudo make install

Build Tags

podman supports optional build tags for compiling support of various features. To add build tags to the make option the BUILDTAGS variable must be set.

make BUILDTAGS='seccomp apparmor'
Build Tag Feature Dependency
seccomp syscall filtering libseccomp
selinux selinux process and mount labeling libselinux
apparmor apparmor profile support libapparmor

Configuration files

registries.conf

Man Page: registries.conf.5

/etc/containers/registries.conf

registries.conf is the configuration file which specifies which container registries should be consulted when completing image names which do not include a registry or domain portion.

Example from the Fedora containers-common package

cat /etc/containers/registries.conf
# This is a system-wide configuration file used to
# keep track of registries for various container backends.
# It adheres to TOML format and does not support recursive
# lists of registries.

# The default location for this configuration file is /etc/containers/registries.conf.

# The only valid categories are: 'registries.search', 'registries.insecure',
# and 'registries.block'.

[registries.search]
registries = ['docker.io', 'registry.fedoraproject.org', 'quay.io', 'registry.access.redhat.com', 'registry.centos.org']

# If you need to access insecure registries, add the registry's fully-qualified name.
# An insecure registry is one that does not have a valid SSL certificate or only does HTTP.
[registries.insecure]
registries = []


# If you need to block pull access from a registry, uncomment the section below
# and add the registries fully-qualified name.
#
# Docker only
[registries.block]
registries = []

mounts.conf

/usr/share/containers/mounts.conf and optionally /etc/containers/mounts.conf

The mounts.conf files specify volume mount directories that are automatically mounted inside containers when executing the podman run or podman build commands. Container process can then use this content. The volume mount content does not get committed to the final image.

Usually these directories are used for passing secrets or credentials required by the package software to access remote package repositories.

For example, a mounts.conf with the line "/usr/share/rhel/secrets:/run/secrets", the content of /usr/share/rhel/secrets directory is mounted on /run/secrets inside the container. This mountpoint allows Red Hat Enterprise Linux subscriptions from the host to be used within the container.

Note this is not a volume mount. The content of the volumes is copied into container storage, not bind mounted directly from the host.

Example from the Fedora containers-common package:

cat /usr/share/containers/mounts.conf
/usr/share/rhel/secrets:/run/secrets

seccomp.json

/usr/share/containers/seccomp.json

seccomp.json contains the whitelist of seccomp rules to be allowed inside of containers. This file is usually provided by the containers-common package.

The link above takes you to the seccomp.json

policy.json

/etc/containers/policy.json

Man Page: policy.json.5

Example from the Fedora containers-common package:

cat /etc/containers/policy.json
{
    "default": [
	{
	    "type": "insecureAcceptAnything"
	}
    ],
    "transports":
	{
	    "docker-daemon":
		{
		    "": [{"type":"insecureAcceptAnything"}]
		}
	}
}