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@@ -7,8 +7,13 @@
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# * newuidmap and newgidmap needs to be installed.
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# * /etc/subuid and /etc/subgid needs to be configured for the current user.
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# * Either one of slirp4netns (>= v0.4.0), VPNKit, lxc-user-nic needs to be installed.
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-# slirp4netns is used by default if installed. Otherwise fallsback to VPNKit.
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-# The default value can be overridden with $DOCKERD_ROOTLESS_ROOTLESSKIT_NET=(slirp4netns|vpnkit|lxc-user-nic)
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+#
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+# Recognized environment variables:
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+# * DOCKERD_ROOTLESS_ROOTLESSKIT_NET=(slirp4netns|vpnkit|lxc-user-nic): the rootlesskit network driver. Defaults to "slirp4netns" if slirp4netns (>= v0.4.0) is installed. Otherwise defaults to "vpnkit".
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+# * DOCKERD_ROOTLESS_ROOTLESSKIT_MTU=NUM: the MTU value for the rootlesskit network driver. Defaults to 65520 for slirp4netns, 1500 for other drivers.
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+# * DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER=(builtin|slirp4netns): the rootlesskit port driver. Defaults to "builtin".
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+# * DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX=(auto|true|false): whether to protect slirp4netns with a dedicated mount namespace. Defaults to "auto".
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+# * DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP=(auto|true|false): whether to protect slirp4netns with seccomp. Defaults to "auto".
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#
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# See the documentation for the further information: https://docs.docker.com/engine/security/rootless/
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@@ -36,6 +41,7 @@ fi
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: "${DOCKERD_ROOTLESS_ROOTLESSKIT_NET:=}"
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: "${DOCKERD_ROOTLESS_ROOTLESSKIT_MTU:=}"
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+: "${DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER:=builtin}"
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: "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX:=auto}"
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: "${DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP:=auto}"
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net=$DOCKERD_ROOTLESS_ROOTLESSKIT_NET
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@@ -79,7 +85,7 @@ if [ -z $_DOCKERD_ROOTLESS_CHILD ]; then
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--net=$net --mtu=$mtu \
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--slirp4netns-sandbox=$DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SANDBOX \
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--slirp4netns-seccomp=$DOCKERD_ROOTLESS_ROOTLESSKIT_SLIRP4NETNS_SECCOMP \
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- --disable-host-loopback --port-driver=builtin \
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+ --disable-host-loopback --port-driver=$DOCKERD_ROOTLESS_ROOTLESSKIT_PORT_DRIVER \
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--copy-up=/etc --copy-up=/run \
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--propagation=rslave \
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$DOCKERD_ROOTLESS_ROOTLESSKIT_FLAGS \
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Brian Goff