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Namespaced Leios demo #682

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ad86a4f
Draft configure-netns.sh script for namespaced Leios experiments
bladyjoker Dec 9, 2025
23a5fa9
Configure IP assignments and network routes
bladyjoker Dec 9, 2025
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6 changes: 5 additions & 1 deletion demo/2025-11/build.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,11 @@
name = "dev-leios-202511-demo";
src = ./.;
inputsFrom = [ config.devShells.dev-demo ];
packages = [ pkgs.process-compose ];
packages = [
pkgs.process-compose
pkgs.iproute2
pkgs.sqlite
];
inherit (config.devShells.dev-demo) IMMDB_SERVER CARDANO_NODE;
};

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80 changes: 80 additions & 0 deletions demo/2025-11/configure-netns.sh
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@@ -0,0 +1,80 @@
NS_PREFIX="leios_experiment"
NS_UPSTREAM="${NS_PREFIX}-upstream"
NS_NODE0="${NS_PREFIX}-node0"
NS_DOWNSTREAM="${NS_PREFIX}-downstream"
IP_UPSTREAM="10.0.0.1"
IP_NODE0="10.0.0.2"
IP_DOWNSTREAM="10.0.0.3"

# Delete all namespaces
ip netns del "$NS_UPSTREAM";
ip netns del "$NS_NODE0";
ip netns del "$NS_DOWNSTREAM";

# Create all namespaces
ip netns add "$NS_UPSTREAM";
ip netns add "$NS_NODE0";
ip netns add "$NS_DOWNSTREAM";

# Create a VETH link upstream <-> node0
ip link add "up->n0" type veth peer name "n0->up"
ip link set "up->n0" netns "$NS_UPSTREAM"
ip link set "n0->up" netns "$NS_NODE0"
ip netns exec "$NS_UPSTREAM" ip link set "up->n0" up
ip netns exec "$NS_NODE0" ip link set "n0->up" up

# Create a VETH link node0 <-> downstream
ip link add "n0->down" type veth peer name "down->n0"
ip link set "n0->down" netns "$NS_NODE0"
ip link set "down->n0" netns "$NS_DOWNSTREAM"
ip netns exec "$NS_NODE0" ip link set "n0->down" up
ip netns exec "$NS_DOWNSTREAM" ip link set "down->n0" up

# Configure IFB devices for TC
ip netns exec "$NS_UPSTREAM" ip link add "ifb!up->n0" type ifb
ip netns exec "$NS_NODE0" ip link add "ifb!n0->up" type ifb
ip netns exec "$NS_NODE0" ip link add "ifb!n0->down" type ifb
ip netns exec "$NS_DOWNSTREAM" ip link add "ifb!down->n0" type ifb

ip netns exec "$NS_UPSTREAM" ip link set "ifb!up->n0" up
ip netns exec "$NS_NODE0" ip link set "ifb!n0->up" up
ip netns exec "$NS_NODE0" ip link set "ifb!n0->down" up
ip netns exec "$NS_DOWNSTREAM" ip link set "ifb!down->n0" up

# Configure traffic control

function limit_rate() {
ns="$1"
veth_dev="$2"
rate="$3"
ip netns exec "$ns" tc qdisc add dev "$veth_dev" root handle 1: htb default 1
ip netns exec "$ns" tc class add dev "$veth_dev" parent 1: classid 1:1 htb rate "$rate"
ip netns exec "$ns" tc qdisc add dev "$veth_dev" parent 1:1 handle 10: fq_codel
}

function delay() {
ns="$1"
veth_dev="$2"
delay="$3"
ip netns exec "$ns" tc qdisc add dev "$veth_dev" handle ffff: ingress
ip netns exec "$ns" tc filter add dev "$veth_dev" parent ffff: protocol ip u32 match u32 0 0 action mirred egress redirect dev "ifb!$veth_dev"
ip netns exec "$ns" tc qdisc add dev "ifb!$veth_dev" root netem delay "$delay"
}

limit_rate "$NS_UPSTREAM" "up->n0" "100mbit"
delay "$NS_UPSTREAM" "up->n0" "20ms"

limit_rate "$NS_NODE0" "n0->up" "100mbit"
delay "$NS_NODE0" "n0->up" "20ms"
limit_rate "$NS_NODE0" "n0->down" "100mbit"
delay "$NS_NODE0" "n0->down" "20ms"

limit_rate "$NS_DOWNSTREAM" "down->n0" "100mbit"
delay "$NS_DOWNSTREAM" "down->n0" "20ms"

# Configure IP assignments and network routes
ip netns exec "$NS_UPSTREAM" ip addr add local "$IP_UPSTREAM" peer "$IP_NODE0" dev "up->n0"
ip netns exec "$NS_NODE0" ip addr add local "$IP_NODE0" peer "$IP_UPSTREAM" dev "n0->up"
ip netns exec "$NS_NODE0" ip addr add local "$IP_NODE0" peer "$IP_DOWNSTREAM" dev "n0->down"
ip netns exec "$NS_DOWNSTREAM" ip addr add local "$IP_DOWNSTREAM" peer "$IP_NODE0" dev "down->n0"