ca0c33ae5b
A number of tests and examples use dhclient in both IPv4 and IPv6 modes.
We use "dhclient -6" for IPv6, but usually just "dhclient" for IPv4. Add
an explicit "-4" argument to make it more clear and explicit.
In addition, when dhclient is run from within pasta it usually won't be
"real" root, and so will not have access to write the default global pid
file. This results in a mostly harmless but irritating error:
Can't create /var/run/dhclient.pid: Permission denied
We can avoid that by using the --no-pid flag to dhclient.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
278 lines
4.9 KiB
Text
278 lines
4.9 KiB
Text
# SPDX-License-Identifier: AGPL-3.0-or-later
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#
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# PASST - Plug A Simple Socket Transport
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# for qemu/UNIX domain socket mode
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#
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# PASTA - Pack A Subtle Tap Abstraction
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# for network namespace/tap device mode
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#
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# test/demo/pasta - Quick introduction to pasta
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#
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# Copyright (c) 2021 Red Hat GmbH
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# Author: Stefano Brivio <sbrivio@redhat.com>
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onlyfor pasta
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say This is a short introduction to
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em pasta
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say .
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nl
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nl
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sleep 3
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say Let's fetch the source
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sleep 1
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tempdir TEMPDIR
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host cd __TEMPDIR__
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host git clone https://passt.top/passt
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sleep 1
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say and build it.
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sleep 1
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host cd passt
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host make
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sleep 1
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nl
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nl
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say A quick look at the man page...
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sleep 1
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hostb man ./pasta.1
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sleep 5
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hostb /pasta
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sleep 2
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hostb n
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sleep 2
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hostb n
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sleep 10
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nl
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say without PID, it will create a namespace.
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sleep 3
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passt cd __TEMPDIR__/passt
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passtb ./pasta
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sleep 3
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nl
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nl
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say For convenience, let's enter this namespace
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nl
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say from another terminal.
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sleep 3
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ns pstree -p | grep pasta
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nsout TARGET_PID pstree -p | grep pasta | sed -n 's/.*(\([0-9].*\))$/\1/p'
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sleep 1
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ns nsenter -t __TARGET_PID__ -U -n --preserve-credentials
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sleep 5
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nl
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nl
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say Now, we're ready to configure networking.
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sleep 2
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host q
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nl
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nl
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ns ip link show
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sleep 3
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say Let's configure IPv4 first...
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sleep 2
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ns dhclient -4 --no-pid
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sleep 2
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ns ip addr show
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sleep 5
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nl
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say SLAAC is already done, but we can also
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nl
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say get another address via DHCPv6.
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sleep 3
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ns dhclient -6 --no-pid
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sleep 3
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nl
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nl
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say Let's try to communicate between host and namespace
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sleep 2
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nl
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say ...there's no need to configure port forwarding,
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nl
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say pasta detects bound ports and forwards them.
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sleep 3
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nsb nc -6 -l -p 31337
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sleep 2
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host echo "Hello from the host" | nc -N ::1 31337
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sleep 5
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nl
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nl
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say Now the other way around...
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nl
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say we can use a loopback address
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sleep 2
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hostb nc -l -p 31337
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sleep 2
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ns echo "Hello from the namespace" | nc -N 127.0.0.1 31337
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sleep 5
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nl
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say or the address of the default gateway.
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sleep 2
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nsout GW ip -j -4 route show|jq -rM '.[] | select(.dst == "default").gateway'
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sleep 5
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hostb nc -l -p 31337
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sleep 2
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ns echo "Hello from the namespace" | nc -N __GW__ 31337
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sleep 3
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nl
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nl
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say UDP...
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sleep 2
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ns host -t A passt.top
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sleep 3
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say seems to work too.
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sleep 3
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nl
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nl
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em pasta
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say can also take packet captures.
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sleep 3
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passt exit
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sleep 2
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temp TEMP
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passtb ./pasta -p __TEMP__.pcap
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sleep 2
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passt
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passt /sbin/dhclient -4 --no-pid
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sleep 2
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hostb tshark -r __TEMP__.pcap
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sleep 5
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nl
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nl
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say And there are tons of totally useless
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sleep 1
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bsp 14
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say absolutely useful features
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nl
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say you can find described in the man page.
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sleep 5
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nl
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nl
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say Let's have a (quick!) look at performance
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nl
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say more in the "Performance" section below.
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sleep 3
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ns exit
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passt exit
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passt make clean
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passt CFLAGS="-g" make
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sleep 2
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passtb perf record -g ./pasta
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sleep 2
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nsout TARGET_PID pstree -p | grep pasta | sed -n 's/.*(\([0-9].*\))$/\1/p'
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sleep 1
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ns nsenter -t __TARGET_PID__ -U -n --preserve-credentials
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sleep 5
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nl
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nl
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info Throughput in Gbps, latency in µs
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th flow init>ns ns>init
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set OPTS -P4 -l 1M -w 32M -i1 --pacing-timer 100000
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tr TCP/IPv6 throughput
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hostb sleep 10; iperf3 -c ::1 __OPTS__
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nsout BW iperf3 -s1J | jq -rM ".end.sum_received.bits_per_second"
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bw __BW__ 10.0 20.0
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sleep 5
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nsb sleep 10; iperf3 -c ::1 __OPTS__
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hout BW iperf3 -s1J | jq -rM ".end.sum_received.bits_per_second"
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bw __BW__ 10.0 20.0
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tl TCP/IPv6 RR latency
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nsb tcp_rr -6 --nolog
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sleep 2
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hout LAT tcp_rr --nolog -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 500
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sleep 2
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hostb tcp_rr -6 --nolog
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sleep 2
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nsout LAT tcp_rr --nolog -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 500
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sleep 2
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tl TCP/IPv6 CRR latency
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nsb tcp_crr -6 --nolog
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sleep 2
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hout LAT tcp_crr --nolog -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 500
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sleep 2
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hostb tcp_crr -6 --nolog
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sleep 2
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nsout LAT tcp_crr --nolog -c -H ::1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 500
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sleep 2
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tr TCP/IPv4 throughput
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hostb sleep 10; iperf3 -c 127.0.0.1 __OPTS__
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nsout BW iperf3 -s1J | jq -rM ".end.sum_received.bits_per_second"
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bw __BW__ 10.0 20.0
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sleep 5
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nsb sleep 10; iperf3 -c 127.0.0.1 __OPTS__
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hout BW iperf3 -s1J | jq -rM ".end.sum_received.bits_per_second"
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bw __BW__ 10.0 20.0
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tl TCP/IPv4 RR latency
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nsb tcp_rr -4 --nolog
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sleep 2
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hout LAT tcp_rr --nolog -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 500
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sleep 2
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hostb tcp_rr -4 --nolog
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sleep 2
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nsout LAT tcp_rr --nolog -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 500
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sleep 2
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tl TCP/IPv4 CRR latency
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nsb tcp_crr -4 --nolog
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sleep 2
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hout LAT tcp_crr --nolog -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 500
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sleep 2
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hostb tcp_crr -4 --nolog
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sleep 2
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nsout LAT tcp_crr --nolog -c -H 127.0.0.1 | sed -n 's/^throughput=\(.*\)/\1/p'
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lat __LAT__ 1000 500
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sleep 2
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sleep 5
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passt exit
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sleep 2
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killp PASST
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killp HOST
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sleep 2
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ns cd __TEMPDIR__/passt
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nsb perf report -g --max-stack 3
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sleep 10
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nl
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nl
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say I
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em knew
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say it.
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em syscalls
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say .
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sleep 5
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nl
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nl
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say Thanks for watching!
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sleep 5
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