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flannel1.sh
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flannel1.sh
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#
# simulate kubernetes flannel networking data plane
#
set -x
# set up 3 namespaces with diff hostnames
unshare --net --uts -r /bin/bash &
export pid_netns1=$!
sudo nsenter -t $pid_netns1 -u hostname netns1
unshare --net --uts -r /bin/bash &
export pid_netns2=$!
sudo nsenter -t $pid_netns2 -u hostname netns2
unshare --net --uts -r /bin/bash &
export pid_netns3=$!
sudo nsenter -t $pid_netns3 -u hostname netns3
# set up bridge and veth links
sudo ip link add ens192 netns $pid_netns1 type veth peer name eth1 netns $pid_netns3
sudo ip link add ens192 netns $pid_netns2 type veth peer name eth2 netns $pid_netns3
sudo nsenter -t $pid_netns3 -u -n /bin/bash -c "
brctl addbr brx
ip link set brx up
"
# set up L3
sudo nsenter -t $pid_netns1 -u -n /bin/bash -c "
ip addr add 192.168.5.1/24 brd 192.168.5.255 dev ens192
ip link set ens192 up
ip link set lo up
ip a s
"
sudo nsenter -t $pid_netns2 -u -n /bin/bash -c "
ip addr add 192.168.5.2/24 brd 192.168.5.255 dev ens192
ip link set ens192 up
ip link set lo up
ip a s
"
# finish bridge setup
sudo nsenter -t $pid_netns3 -u -n /bin/bash -c "
ip link set eth1 up
ip link set eth2 up
brctl addif brx eth1
brctl addif brx eth2
"
# vxlan setup
sudo nsenter -t $pid_netns1 -u -n /bin/bash -c "
ip link add vxlan1 type vxlan id 100 dstport 8472 local 192.168.5.1 nolearning
"
export vxlan1_vtep=$(sudo nsenter -t $pid_netns1 -u -n /bin/bash -c "ip link show vxlan1" | grep ether | awk '{print $2}')
echo $vxlan1_vtep
sudo nsenter -t $pid_netns2 -u -n /bin/bash -c "
ip link add vxlan2 type vxlan id 100 dstport 8472 local 192.168.5.2 nolearning
"
export vxlan2_vtep=$(sudo nsenter -t $pid_netns2 -u -n /bin/bash -c "ip link show vxlan2" | grep ether | awk '{print $2}')
echo $vxlan2_vtep
sudo nsenter -t $pid_netns1 -u -n /bin/bash -c "
ip neigh add 10.245.1.0 lladdr $vxlan2_vtep dev vxlan1
bridge fdb append $vxlan2_vtep dev vxlan1 dst 192.168.5.2
"
sudo nsenter -t $pid_netns1 -u -n /bin/bash -c "
ip l set vxlan1 up
ip -d link show vxlan1
ip addr add 10.245.0.0/32 dev vxlan1
ip route add 10.245.1.0/24 via 10.245.1.0 dev vxlan1 onlink
"
sudo nsenter -t $pid_netns2 -u -n /bin/bash -c "
ip neigh add 10.245.0.0 lladdr $vxlan1_vtep dev vxlan2
bridge fdb append $vxlan1_vtep dev vxlan2 dst 192.168.5.1
"
sudo nsenter -t $pid_netns2 -u -n /bin/bash -c "
ip l set vxlan2 up
ip -d l show vxlan2
ip addr add 10.245.1.0/32 dev vxlan2
ip route add 10.245.0.0/24 via 10.245.0.0 dev vxlan2 onlink
"
# set up container-like netns in host 1
unshare --net --uts -r /bin/bash &
export pid_netns4=$!
sudo nsenter -t $pid_netns4 -u hostname netns4
unshare --net --uts -r /bin/bash &
export pid_netns5=$!
sudo nsenter -t $pid_netns5 -u hostname netns5
# set up bridge and veth links
sudo ip link add eth0 netns $pid_netns4 type veth peer name veth14 netns $pid_netns1
sudo ip link add eth0 netns $pid_netns5 type veth peer name veth15 netns $pid_netns1
sudo nsenter -t $pid_netns1 -u -n /bin/bash -c "
brctl addbr cni0
ip link set cni0 up
"
# set up L3
sudo nsenter -t $pid_netns4 -u -n /bin/bash -c "
ip addr add 10.245.0.4/24 brd 10.245.0.255 dev eth0
ip link set eth0 up
ip link set lo up
ip a s
ip route add default via 10.245.0.1 dev eth0
"
sudo nsenter -t $pid_netns5 -u -n /bin/bash -c "
ip addr add 10.245.0.5/24 brd 10.245.0.255 dev eth0
ip link set eth0 up
ip link set lo up
ip a s
ip route add default via 10.245.0.1 dev eth0
"
# finish bridge setup
sudo nsenter -t $pid_netns1 -u -n /bin/bash -c "
ip link set veth14 up
ip link set veth15 up
brctl addif cni0 veth14
brctl addif cni0 veth15
ip addr add 10.245.0.1/24 brd 10.245.0.255 dev cni0
ip link set cni0 up
ip link set lo up
ip a s
# allow IP forwarding
echo 1 > /proc/sys/net/ipv4/conf/all/forwarding
# optional SNAT
iptables -t nat -A POSTROUTING -o vxlan1 -j SNAT --to 10.245.0.0
"
set +x
echo "export pid_netns1=$pid_netns1"
echo "export pid_netns2=$pid_netns2"
echo "export pid_netns3=$pid_netns3"
echo "export pid_netns4=$pid_netns4"
echo "export pid_netns5=$pid_netns5"
echo "export pid_netns6=$pid_netns6"
echo "export pid_netns7=$pid_netns7"