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containerd-rootless.sh
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containerd-rootless.sh
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#!/bin/sh
# Copyright The containerd Authors.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Forked from https://github.com/moby/moby/blob/v20.10.3/contrib/dockerd-rootless.sh
# Copyright The Moby Authors.
# Licensed under the Apache License, Version 2.0
# NOTICE: https://github.com/moby/moby/blob/v20.10.3/NOTICE
# -----------------------------------------------------------------------------
# containerd-rootless.sh executes containerd in rootless mode.
#
# Usage: containerd-rootless.sh [CONTAINERD_OPTIONS]
#
# External dependencies:
# * newuidmap and newgidmap needs to be installed.
# * /etc/subuid and /etc/subgid needs to be configured for the current user.
# * RootlessKit (>= v0.10.0) needs to be installed. RootlessKit >= v0.14.1 is recommended.
# * Either one of slirp4netns (>= v0.4.0), VPNKit, lxc-user-nic needs to be installed. slirp4netns >= v1.1.7 is recommended.
#
# Recognized environment variables:
# * CONTAINERD_ROOTLESS_ROOTLESSKIT_STATE_DIR=DIR: the rootlesskit state dir. Defaults to "$XDG_RUNTIME_DIR/containerd-rootless".
# * CONTAINERD_ROOTLESS_ROOTLESSKIT_NET=(slirp4netns|vpnkit|lxc-user-nic): the rootlesskit network driver. Defaults to "slirp4netns" if slirp4netns (>= v0.4.0) is installed. Otherwise defaults to "vpnkit".
# * CONTAINERD_ROOTLESS_ROOTLESSKIT_MTU=NUM: the MTU value for the rootlesskit network driver. Defaults to 65520 for slirp4netns, 1500 for other drivers.
# * CONTAINERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=(builtin|slirp4netns): the rootlesskit port driver. Defaults to "builtin".
# * CONTAINERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX=(auto|true|false): whether to protect slirp4netns with a dedicated mount namespace. Defaults to "auto".
# * CONTAINERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP=(auto|true|false): whether to protect slirp4netns with seccomp. Defaults to "auto".
set -e
if ! [ -w $XDG_RUNTIME_DIR ]; then
echo "XDG_RUNTIME_DIR needs to be set and writable"
exit 1
fi
if ! [ -w $HOME ]; then
echo "HOME needs to be set and writable"
exit 1
fi
: "${XDG_DATA_HOME:=$HOME/.local/share}"
: "${XDG_CONFIG_HOME:=$HOME/.config}"
if [ -z $_CONTAINERD_ROOTLESS_CHILD ]; then
if [ "$(id -u)" = "0" ]; then
echo "Must not run as root"
exit 1
fi
case "$1" in
"check" | "install" | "uninstall")
echo "Did you mean 'containerd-rootless-setuptool.sh $@' ?"
exit 1
;;
esac
: "${CONTAINERD_ROOTLESS_ROOTLESSKIT_STATE_DIR:=$XDG_RUNTIME_DIR/containerd-rootless}"
: "${CONTAINERD_ROOTLESS_ROOTLESSKIT_NET:=}"
: "${CONTAINERD_ROOTLESS_ROOTLESSKIT_MTU:=}"
: "${CONTAINERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER:=builtin}"
: "${CONTAINERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX:=auto}"
: "${CONTAINERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP:=auto}"
net=$CONTAINERD_ROOTLESS_ROOTLESSKIT_NET
mtu=$CONTAINERD_ROOTLESS_ROOTLESSKIT_MTU
if [ -z $net ]; then
if command -v slirp4netns >/dev/null 2>&1; then
# If --netns-type is present in --help, slirp4netns is >= v0.4.0.
if slirp4netns --help | grep -qw -- --netns-type; then
net=slirp4netns
if [ -z $mtu ]; then
mtu=65520
fi
else
echo "slirp4netns found but seems older than v0.4.0. Falling back to VPNKit."
fi
fi
if [ -z $net ]; then
if command -v vpnkit >/dev/null 2>&1; then
net=vpnkit
else
echo "Either slirp4netns (>= v0.4.0) or vpnkit needs to be installed"
exit 1
fi
fi
fi
if [ -z $mtu ]; then
mtu=1500
fi
_CONTAINERD_ROOTLESS_CHILD=1
export _CONTAINERD_ROOTLESS_CHILD
# `selinuxenabled` always returns false in RootlessKit child, so we execute `selinuxenabled` in the parent.
# https://github.com/rootless-containers/rootlesskit/issues/94
if command -v selinuxenabled >/dev/null 2>&1; then
if selinuxenabled; then
_CONTAINERD_ROOTLESS_SELINUX=1
export _CONTAINERD_ROOTLESS_SELINUX
fi
fi
# Re-exec the script via RootlessKit, so as to create unprivileged {user,mount,network} namespaces.
#
# --copy-up allows removing/creating files in the directories by creating tmpfs and symlinks
# * /etc: copy-up is required so as to prevent `/etc/resolv.conf` in the
# namespace from being unexpectedly unmounted when `/etc/resolv.conf` is recreated on the host
# (by either systemd-networkd or NetworkManager)
# * /run: copy-up is required so that we can create /run/containerd (hardcoded) in our namespace
# * /var/lib: copy-up is required so that we can create /var/lib/containerd in our namespace
exec rootlesskit \
--state-dir=$CONTAINERD_ROOTLESS_ROOTLESSKIT_STATE_DIR \
--net=$net --mtu=$mtu \
--slirp4netns-sandbox=$CONTAINERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX \
--slirp4netns-seccomp=$CONTAINERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP \
--disable-host-loopback --port-driver=$CONTAINERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER \
--copy-up=/etc --copy-up=/run --copy-up=/var/lib \
--propagation=rslave \
$CONTAINERD_ROOTLESS_ROOTLESSKIT_FLAGS \
$0 $@
else
[ $_CONTAINERD_ROOTLESS_CHILD = 1 ]
# Remove the *symlinks* for the existing files in the parent namespace if any,
# so that we can create our own files in our mount namespace.
# The actual files in the parent namespace are *not removed* by this rm command.
rm -f /run/containerd /run/xtables.lock \
/var/lib/containerd /var/lib/cni /etc/containerd
# Bind-mount /etc/ssl.
# Workaround for "x509: certificate signed by unknown authority" on openSUSE Tumbleweed.
# https://github.com/rootless-containers/rootlesskit/issues/225
realpath_etc_ssl=$(realpath /etc/ssl)
rm -f /etc/ssl
mkdir /etc/ssl
mount --rbind "${realpath_etc_ssl}" /etc/ssl
# Bind-mount /run/containerd
mkdir -p "${XDG_RUNTIME_DIR}/containerd" "/run/containerd"
mount --bind "${XDG_RUNTIME_DIR}/containerd" "/run/containerd"
# Bind-mount /var/lib/containerd
mkdir -p "${XDG_DATA_HOME}/containerd" "/var/lib/containerd"
mount --bind "${XDG_DATA_HOME}/containerd" "/var/lib/containerd"
# Bind-mount /var/lib/cni
mkdir -p "${XDG_DATA_HOME}/cni" "/var/lib/cni"
mount --bind "${XDG_DATA_HOME}/cni" "/var/lib/cni"
# Bind-mount /etc/containerd
mkdir -p "${XDG_CONFIG_HOME}/containerd" "/etc/containerd"
mount --bind "${XDG_CONFIG_HOME}/containerd" "/etc/containerd"
if [ -n "$_CONTAINERD_ROOTLESS_SELINUX" ]; then
# iptables requires /run in the child to be relabeled. The actual /run in the parent is unaffected.
# https://github.com/containers/podman/blob/e6fc34b71aa9d876b1218efe90e14f8b912b0603/libpod/networking_linux.go#L396-L401
# https://github.com/moby/moby/issues/41230
chcon system_u:object_r:iptables_var_run_t:s0 /run
fi
exec containerd $@
fi