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#!/bin/sh # dockerd-rootless.sh executes dockerd in rootless mode. # # Usage: dockerd-rootless.sh [DOCKERD_OPTIONS] # # External dependencies: # * newuidmap and newgidmap needs to be installed. # * /etc/subuid and /etc/subgid needs to be configured for the current user. # * Either one of slirp4netns (>= v0.4.0), VPNKit, lxc-user-nic needs to be installed. # # Recognized environment variables: # * DOCKERD_ROOTLESS_ROOTLESSKIT_STATE_DIR=DIR: the rootlesskit state dir. # * Defaults to "$XDG_RUNTIME_DIR/dockerd-rootless". # * DOCKERD_ROOTLESS_ROOTLESSKIT_NET=(slirp4netns|vpnkit|pasta|lxc-user-nic): the rootlesskit network driver. # * Defaults to "slirp4netns" if slirp4netns (>= v0.4.0) is installed, else "pasta", else "vpnkit". # * DOCKERD_ROOTLESS_ROOTLESSKIT_MTU=NUM: the MTU value for the rootlesskit network driver. # * Defaults to 65520 for slirp4netns and pasta, 1500 for other rootlesskit network drivers. # * DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=(builtin|slirp4netns|implicit): the rootlesskit port driver. # * Defaults to "implicit" for "pasta", "builtin" for other rootlesskit network drivers. # * DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX=(auto|true|false): whether to protect slirp4netns with a dedicated mount namespace. # * Defaults to "auto". # * DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP=(auto|true|false): whether to protect slirp4netns with seccomp. # * Defaults to "auto". # * DOCKERD_ROOTLESS_ROOTLESSKIT_DISABLE_HOST_LOOPBACK=(true|false): prohibit connections to 127.0.0.1 on the host (including via 10.0.2.2, in the case of slirp4netns). # * Defaults to "true". # To apply an environment variable via systemd, create ~/.config/systemd/user/docker.service.d/override.conf as follows, # and run `systemctl --user daemon-reload && systemctl --user restart docker`: # --- BEGIN --- # [Service] # Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_NET=pasta" # Environment="DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=implicit" # --- END --- # Guide to choose the network driver and the port driver: # # Network driver | Port driver | Net throughput | Port throughput | Src IP | No SUID | Note # ---------------|----------------|----------------|-----------------|--------|---------|--------------------------------------------------------- # slirp4netns | builtin | Slow | Fast ✅ | ❌ | ✅ | Default in typical setup # vpnkit | builtin | Slow | Fast ✅ | ❌ | ✅ | Default when slirp4netns is not installed # slirp4netns | slirp4netns | Slow | Slow | ✅ | ✅ | # pasta | implicit | Slow | Fast ✅ | ✅ | ✅ | Experimental; Needs recent version of pasta (2023_12_04) # lxc-user-nic | builtin | Fast ✅ | Fast ✅ | ❌ | ❌ | Experimental # (bypass4netns) | (bypass4netns) | Fast ✅ | Fast ✅ | ✅ | ✅ | (Not integrated to RootlessKit) # See the documentation for the further information: https://docs.docker.com/go/rootless/ set -e -x case "$1" in "check" | "install" | "uninstall") echo "Did you mean 'dockerd-rootless-setuptool.sh $@' ?" exit 1 ;; esac if ! [ -w "$XDG_RUNTIME_DIR" ]; then echo "XDG_RUNTIME_DIR needs to be set and writable" exit 1 fi if ! [ -d "$HOME" ]; then echo "HOME needs to be set and exist." exit 1 fi mount_directory() { if [ -z "$_DOCKERD_ROOTLESS_CHILD" ]; then echo "mount_directory should be called from the child context. Otherwise data loss is at risk" >&2 exit 1 fi DIRECTORY="$1" if [ ! -d "$DIRECTORY" ]; then return fi # Bind mount directory: this makes this directory visible to # Dockerd, even if it is originally a symlink, given Dockerd does # not always follow symlinks. Some directories might also be # "copied-up", meaning that they will also be writable on the child # namespace; this will be the case only if they are provided as # --copy-up to the rootlesskit. DIRECTORY_REALPATH=$(realpath "$DIRECTORY") MOUNT_OPTIONS="${2:---bind}" rm -rf "$DIRECTORY" mkdir -p "$DIRECTORY" mount $MOUNT_OPTIONS "$DIRECTORY_REALPATH" "$DIRECTORY" } rootlesskit="" for f in docker-rootlesskit rootlesskit; do if command -v $f > /dev/null 2>&1; then rootlesskit=$f break fi done if [ -z "$rootlesskit" ]; then echo "rootlesskit needs to be installed" exit 1 fi : "${DOCKERD_ROOTLESS_ROOTLESSKIT_STATE_DIR:=$XDG_RUNTIME_DIR/dockerd-rootless}" : "${DOCKERD_ROOTLESS_ROOTLESSKIT_NET:=}" : "${DOCKERD_ROOTLESS_ROOTLESSKIT_MTU:=}" : "${DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER:=}" : "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX:=auto}" : "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP:=auto}" : "${DOCKERD_ROOTLESS_ROOTLESSKIT_DISABLE_HOST_LOOPBACK:=}" net=$DOCKERD_ROOTLESS_ROOTLESSKIT_NET port_driver=$DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER mtu=$DOCKERD_ROOTLESS_ROOTLESSKIT_MTU if [ -z "$net" ]; then if command -v slirp4netns > /dev/null 2>&1; then # If --netns-type is present in --help, slirp4netns is >= v0.4.0. if slirp4netns --help | grep -qw -- --netns-type; then net=slirp4netns else echo "slirp4netns found but seems older than v0.4.0. Checking for other network drivers." fi fi if [ -z "$net" ]; then if command -v pasta > /dev/null 2>&1; then net=pasta fi fi if [ -z "$net" ]; then if command -v vpnkit > /dev/null 2>&1; then net=vpnkit fi fi if [ -z "$net" ]; then echo "One of slirp4netns (>= v0.4.0), pasta (passt >= 2023_12_04), or vpnkit needs to be installed" exit 1 fi fi if [ "$net" = host ]; then echo "Unsupported RootlessKit network driver: $net" exit 1 fi if [ -z "$mtu" ]; then if [ "$net" = slirp4netns -o "$net" = pasta ]; then mtu=65520 else mtu=1500 fi fi if [ -z "$port_driver" ]; then if [ "$net" = pasta ]; then port_driver=implicit else port_driver=builtin fi fi host_loopback="--disable-host-loopback" if [ "$DOCKERD_ROOTLESS_ROOTLESSKIT_DISABLE_HOST_LOOPBACK" = "false" ]; then host_loopback="" fi dockerd="${DOCKERD:-dockerd}" if [ -z "$_DOCKERD_ROOTLESS_CHILD" ]; then _DOCKERD_ROOTLESS_CHILD=1 export _DOCKERD_ROOTLESS_CHILD if [ "$(id -u)" = "0" ]; then echo "This script must be executed as a non-privileged user" exit 1 fi # `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 && selinuxenabled; then _DOCKERD_ROOTLESS_SELINUX=1 export _DOCKERD_ROOTLESS_SELINUX 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/docker (hardcoded for plugins) in our namespace exec $rootlesskit \ --state-dir=$DOCKERD_ROOTLESS_ROOTLESSKIT_STATE_DIR \ --net=$net --mtu=$mtu \ --slirp4netns-sandbox=$DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX \ --slirp4netns-seccomp=$DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP \ $host_loopback --port-driver=$port_driver \ --copy-up=/etc --copy-up=/run \ --propagation=rslave \ $DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS \ "$0" "$@" else [ "$_DOCKERD_ROOTLESS_CHILD" = 1 ] # The Container Device Interface (CDI) specs can be found by default # under {/etc,/var/run}/cdi. More information at: # https://github.com/cncf-tags/container-device-interface # # In order to use the Container Device Interface (CDI) integration, # the CDI paths need to exist before the Docker daemon is started in # order for it to read the CDI specification files. Otherwise, a # Docker daemon restart will be required for the daemon to discover # them. # # If another set of CDI paths (other than the default /etc/cdi and # /var/run/cdi) are configured through the Docker configuration file # (using "cdi-spec-dirs"), they need to be bind mounted in rootless # mode; otherwise the Docker daemon won't have access to the CDI # specification files. mount_directory /etc/cdi mount_directory /var/run/cdi # remove the symlinks for the existing files in the parent namespace if any, # so that we can create our own files in our mount namespace. rm -f /run/docker /run/containerd /run/xtables.lock if [ -n "$_DOCKERD_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 if [ "$(stat -c %T -f /etc)" = "tmpfs" ] && [ -L "/etc/ssl" ]; then # Workaround for "x509: certificate signed by unknown authority" on openSUSE Tumbleweed. # https://github.com/rootless-containers/rootlesskit/issues/225 mount_directory /etc/ssl "--rbind" fi # When running with --firewall-backend=nftables, IP forwarding needs to be enabled # because the daemon won't enable it. IP forwarding is harmless in the rootless # netns, there's only a single external interface and only Docker uses the netns. # So, always enable IPv4 and IPv6 forwarding. But ignore failure to enable IPv6 # forwarding, for hosts with IPv6 disabled. sysctl -w net.ipv4.ip_forward=1 sysctl -w net.ipv6.conf.all.forwarding=1 || true exec "$dockerd" "$@" fi
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