veth 路线似乎不太简单,但我认为基于这个答案 https://stackoverflow.com/questions/21724225/docker-how-to-get-veth-bridge-interface-pair-easily.
但是,默认情况下(使用桥接接口)来自和发送到容器 virt 接口的请求将通过默认桥接网络接口docker0
.
您可以在那里设置 NetEm 规则,但它也会减慢所有其他容器的速度。如果这是一个选项,请在单独的网络上运行容器(使用docker network create
)将是一种更干净的实验/测试方法。
docker network create slownet
docker network inspect slownet
[
{
"Name": "slownet",
"Id": "535e40d880716a27efe1fd3fada62bdc4d9fa13bde09279de650fa53f13f7cdd",
"Scope": "local",
"Driver": "bridge",
"EnableIPv6": false,
"IPAM": {
"Driver": "default",
"Options": {},
"Config": [
{
"Subnet": "172.19.0.0/16",
"Gateway": "172.19.0.1/16"
}
]
},
"Internal": false,
"Containers": {},
"Options": {},
"Labels": {}
}
]
ifconfig
....
br-535e40d88071 Link encap:Ethernet HWaddr 02:42:4E:B6:F8:C2
inet addr:172.19.0.1 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::42:4eff:feb6:f8c2%32727/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:180 errors:0 dropped:0 overruns:0 frame:0
TX packets:180 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:14368 (14.0 KiB) TX bytes:16888 (16.4 KiB)
....
# so br-535e40d88071 is the interface
让我们启动容器并开始 ping:
host> docker run -ti --rm --net=slownet alpine sh
container> ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes
64 bytes from 8.8.8.8: seq=114 ttl=37 time=0.251 ms
然后添加 NetEm 规则:
host> tc qdisc add dev br-535e40d88071 root netem delay 100ms
当这种情况发生时,我会看到延迟增加:
64 bytes from 8.8.8.8: seq=115 ttl=37 time=0.693 ms
64 bytes from 8.8.8.8: seq=116 ttl=37 time=101.086 ms
64 bytes from 8.8.8.8: seq=117 ttl=37 time=104.056 ms