174 lines
6.9 KiB
Markdown
174 lines
6.9 KiB
Markdown
# VPP Containerlab Docker image
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## User Documentation
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The file `vpp.clab.yml` contains an example topology existing of two VPP instances connected each to
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one Alpine linux container, in the following topology:
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You can deploy it using `containerlab deploy --topo vpp.clab.yml`.
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Two relevant files for VPP are included in this repository:
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1. `config/vpp*/vppcfg.yaml` configures the dataplane interfaces, including a loopback address.
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1. `config/vpp*/bird-local.conf` configures the controlplane to enable BFD and OSPF.
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Once the lab comes up, you can SSH to the VPP containers (`vpp1` and `vpp2`) which will have your
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SSH keys installed (if available). Otherwise, you can log in as user `root` using password `vpp`.
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VPP runs its own network namespace called `dataplane`, which is very similar to SR Linux default
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`network-instance`. You can join it to take a look:
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```bash
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pim@summer:~/src/vpp-containerlab$ ssh root@vpp1
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root@vpp1:~# nsenter --net=/var/run/netns/dataplane
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root@vpp1:~# ip -br a
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lo DOWN
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loop0 UP 10.82.98.0/32 2001:db8:8298::/128 fe80::dcad:ff:fe00:0/64
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eth1 UNKNOWN 10.82.98.65/28 2001:db8:8298:101::1/64 fe80::a8c1:abff:fe77:acb9/64
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eth2 UNKNOWN 10.82.98.16/31 2001:db8:8298:1::1/64 fe80::a8c1:abff:fef0:7125/64
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root@vpp1:~# ping 10.82.98.1 ## The vpp2 IPv4 loopback address
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PING 10.82.98.1 (10.82.98.1) 56(84) bytes of data.
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64 bytes from 10.82.98.1: icmp_seq=1 ttl=64 time=9.53 ms
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64 bytes from 10.82.98.1: icmp_seq=2 ttl=64 time=15.9 ms
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^C
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--- 10.82.98.1 ping statistics ---
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2 packets transmitted, 2 received, 0% packet loss, time 1002ms
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rtt min/avg/max/mdev = 9.530/12.735/15.941/3.205 ms
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```
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The two clients are running a minimalistic Alpine Linux container, which doesn't ship with SSH by
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default. You can enter the containers as following:
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```bash
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pim@summer:~/src/vpp-containerlab$ docker exec -it client1 sh
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/ # ip addr show dev eth1
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531235: eth1@if531234: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 9500 qdisc noqueue state UP
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link/ether 00:c1:ab:00:00:01 brd ff:ff:ff:ff:ff:ff
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inet 10.82.98.66/28 scope global eth1
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valid_lft forever preferred_lft forever
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inet6 2001:db8:8298:101::2/64 scope global
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valid_lft forever preferred_lft forever
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inet6 fe80::2c1:abff:fe00:1/64 scope link
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valid_lft forever preferred_lft forever
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/ # traceroute 10.82.98.82
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traceroute to 10.82.98.82 (10.82.98.82), 30 hops max, 46 byte packets
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1 10.82.98.65 (10.82.98.65) 5.906 ms 7.086 ms 7.868 ms
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2 10.82.98.17 (10.82.98.17) 24.007 ms 23.349 ms 15.933 ms
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3 10.82.98.82 (10.82.98.82) 39.978 ms 31.127 ms 31.854 ms
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/ # traceroute 2001:db8:8298:102::2
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traceroute to 2001:db8:8298:102::2 (2001:db8:8298:102::2), 30 hops max, 72 byte packets
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1 2001:db8:8298:101::1 (2001:db8:8298:101::1) 0.701 ms 7.144 ms 7.900 ms
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2 2001:db8:8298:1::2 (2001:db8:8298:1::2) 23.909 ms 22.943 ms 23.893 ms
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3 2001:db8:8298:102::2 (2001:db8:8298:102::2) 31.964 ms 30.814 ms 32.000 ms
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```
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From the vantage point of `client1`, the first hop represents the `vpp1` node, which forwards to
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`vpp2`, which finally forwards to `client2`.
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## Developer Documentation
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This docker container creates a VPP instance based on the latest VPP release. It starts up as per
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normal, using /etc/vpp/startup.conf (which Containerlab might replace when it starts its
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containers). Once started, it'll execute `/etc/vpp/bootstrap.vpp` within the dataplane. There are
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two relevant files:
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1. `clab.vpp` -- generated by `files/init-container.sh`. Its purpose is to bind the `veth`
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interfaces that containerlab has added to the container into the VPP dataplane (see below).
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1. `vppcfg.vpp` -- generated by `files/init-container.sh`. Its purpose is to read the user
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specified `vppcfg.yaml` file and convert it into VPP CLI commands. If no YAML file is
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specified, or if it is not syntactically valid, an empty file is generated instead.
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For Containerlab users who wish to have more control over their VPP bootstrap, it's possible to
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bind-mount `/etc/vpp/bootstrap.vpp`.
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### Building
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```bash
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IMG=git.ipng.ch/ipng/vpp-containerlab
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TAG=latest
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docker build --no-cache --build-arg REPO=release -f docker/Dockerfile.bookworm -t $IMG docker/
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docker image tag $IMG $IMG:$TAG
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docker push $IMG
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docker push $IMG:$TAG
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```
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### Testing standalone container
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```bash
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docker network create --driver=bridge clab-network --subnet=192.0.2.0/24 \
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--ipv6 --subnet=2001:db8::/64
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docker rm clab-pim
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docker run --cap-add=NET_ADMIN --cap-add=SYS_NICE --cap-add=SYS_PTRACE \
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--device=/dev/net/tun:/dev/net/tun \
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--device=/dev/vhost-net:/dev/vhost-net \
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--privileged --name clab-pim \
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docker.io/pimvanpelt/vpp-containerlab:latest
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docker network connect clab-network clab-pim
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```
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#### A note on DPDK
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DPDK will be disabled by default as it requires hugepages and VFIO and/or UIO to use physical
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network cards. If DPDK at some future point is desired, mapping VFIO can be done by adding this:
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```
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--device=/dev/vfio/vfio:/dev/vfio/vfio
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```
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or in Containerlab, using the `devices` feature:
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```yaml
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my-node:
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image: git.ipng.ch/ipng/vpp-containerlab:latest
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kind: fdio_vpp
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devices:
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- /dev/vfio/vfio
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- /dev/net/tun
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- /dev/vhost-net
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```
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If using DPDK in a container, one of the userspace IO kernel drivers must be loaded in the host
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kernel. Options are `igb_uio`, `vfio_pci`, or `uio_pci_generic`:
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```bash
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$ sudo modprobe igb_uio
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$ sudo modprobe vfio_pci
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$ sudo modprobe uio_pci_generic
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```
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Particularly the VFIO driver needs to be present before one can attempt to bindmount
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`/dev/vfio/vfio` into the container!
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### Configuring VPP
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When Containerlab starts the docker containers, it'll offer one or more `veth` point to point
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network links, which will show up as `eth1` and further. `eth0` is the default NIC that belongs to
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the management plane in Containerlab (the one which you'll see with `containerlab inspect`). Before
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VPP can use these `veth` interfaces, it needs to bind them, like so:
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```bash
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docker exec -it clab-pim vppctl
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```
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and then within the VPP control shell:
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```
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create host-interface v2 name eth1
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set interface name host-eth1 eth1
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set interface mtu 1500 eth1
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set interface ip address eth1 192.0.2.2/24
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set interface ip address eth1 2001:db8::2/64
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set interface state eth1 up
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```
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Containerlab will attach these `veth` pairs to the container, and replace our Docker CMD with one
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that waits for all of these interfaces to be added (typically called `if-wait.sh`). In our own CMD,
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we then generate a config file called `/etc/vpp/clab.vpp` which contains the necessary VPP commands
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to take control over these `veth` pairs.
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In addition, you can add more commands that'll execute on startup by copying in
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`/etc/vpp/manual-pre.vpp` (to be executed _before_ the containerlab stuff) or
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`/etc/vpp/manual-post.vpp` (to be executed _after_ the containerlab stuff).
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