Help with netem delay examples

[pedro-psb]

Hello,
I'm trying out the delay example but couldn't get it to work.
Any idea on what to look for here?

Host info

$ docker --version
Docker version 28.0.1, build 068a01e

$ cat /etc/os-release
NAME="Fedora Linux"
VERSION="41 (Workstation Edition)"
RELEASE_TYPE=stable
ID=fedora
VERSION_ID=41
VERSION_CODENAME=""
PLATFORM_ID="platform:f41"

$ pumba --version
Pumba version 0.11.6 - [HEAD:1f828ad] 2025-03-17 17:28 UTC

Run

After running these two in two panes, the ping times does not change.

Pane 1:

$ docker run -it --rm --name ping  alpine ping 1.1.1.1  # also tried with example.com and others, same result
PING 1.1.1.1 (1.1.1.1): 56 data bytes
64 bytes from 1.1.1.1: seq=0 ttl=57 time=16.240 ms
64 bytes from 1.1.1.1: seq=1 ttl=57 time=16.219 ms
64 bytes from 1.1.1.1: seq=2 ttl=57 time=16.063 ms
...

Pane 2:

> pumba --log-level debug netem --interface eth0 --duration 5m delay --time 3000 ping
DEBU[0000] using names                                   names="[ping]"
DEBU[0000] adding network delay to all matching containers
DEBU[0000] listing matching containers                   labels="[]" limit=0 names="[ping]" pattern= random=false
DEBU[0000] listing containers
DEBU[0000] found container                               id=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 name=/ping
DEBU[0000] adding network delay for container            container="&{{0xc0004ac2c0 [] 0xc0004e83c0 0xc0004f6100} {sha256:aded1e1a5b3705116fa0a92ba074a5e0b0031647d9c315983ccba2ee5428ec8b [alpine:latest] [alpine@sha256:a8560b36e8b8210634f77d9f7f9efd7ffa463e380b75e2e74aff4511df3ef88c]  buildkit.dockerfile.v0 2025-02-14T03:28:36Z  0xc000408dc0   0xc000408f00 amd64  linux  7834312 7834312 {map[MergedDir:/var/lib/docker/overlay2/b4551bef9225a3a97c0f36fca84bbae736a071d0917b2cf0ccd9e3dfee826a26/merged UpperDir:/var/lib/docker/overlay2/b4551bef9225a3a97c0f36fca84bbae736a071d0917b2cf0ccd9e3dfee826a26/diff WorkDir:/var/lib/docker/overlay2/b4551bef9225a3a97c0f36fca84bbae736a071d0917b2cf0ccd9e3dfee826a26/work] overlay2} {layers [sha256:08000c18d16dadf9553d747a58cf44023423a9ab010aab96cf263d2216b8b350]} {0001-01-01 00:00:00 +0000 UTC}}}"
DEBU[0000] running netem command                         dports="[]" duration=5m0s id=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 iface=eth0 ips="[]" name=/ping netem="[delay 3000ms 10ms 20.00]" pull=true sports="[]" tc-image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
INFO[0000] running netem on container                    command="[delay 3000ms 10ms 20.00]" dports="[]" dryrun=false duration=5m0s id=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 ips="[]" name=/ping pull=true sports="[]" tc-image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0000] start netem for container                     dryrun=false id=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 iface=eth0 name=/ping netem="delay 3000ms 10ms 20.00" pull=true tcimage="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0000] adding netem qdisc                            netem="qdisc add dev eth0 root netem delay 3000ms 10ms 20.00"
DEBU[0000] executing tc command in a separate container joining target container network namespace  args-list="[[qdisc add dev eth0 root netem delay 3000ms 10ms 20.00]]" container=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 pull=true tc-image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0000] network mode                                  network="container:e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744"
DEBU[0000] pulling tc-image                              image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0000] &{Pulling from alexei-led/pumba-alpine-nettools   {0 0}}
DEBU[0000] &{Digest: sha256:61d1b60f2762edd46df25df72f2745fabf563961847b236cc89513897347a243   {0 0}}
DEBU[0000] &{Status: Image is up to date for ghcr.io/alexei-led/pumba-alpine-nettools:latest   {0 0}}
DEBU[0000] creating tc-container                         image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0000] tc container created, starting it             id=b75455fc595c64d4a6d660985248180d6c96914a86a0b72f1bea9be4841175ff
DEBU[0001] run command on tc-container                   args="qdisc add dev eth0 root netem delay 3000ms 10ms 20.00"
DEBU[0001] netem command started                         dports="[]" duration=5m0s id=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 iface=eth0 ips="[]" name=/ping netem="[delay 3000ms 10ms 20.00]" pull=true sports="[]" tc-image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
# hangs here. Then ctrl-c
^CDEBU[0015] Received signal: 2
DEBU[0015] Canceling running chaos commands ...
DEBU[0015] Gracefully exiting after some cleanup ...
DEBU[0015] stopping netem command on abort               dports="[]" duration=5m0s id=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 iface=eth0 ips="[]" name=/ping netem="[delay 3000ms 10ms 20.00]" pull=true sports="[]" tc-image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
INFO[0015] stopping netem on container                   IPs="[]" dports="[]" dryrun=false id=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 iface=eth0 name=/ping pull=true sports="[]" tc-image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0015] stop netem for container                      IPs="[]" dryrun=false id=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 iface=eth0 name=/ping pull=true tcimage="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0015] executing tc command in a separate container joining target container network namespace  args-list="[[qdisc del dev eth0 root netem]]" container=e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744 pull=true tc-image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0015] network mode                                  network="container:e31f6d2727b7e59ce2ef89e97cdc8ac367a589b5a111935048c57bfdc26bc744"
DEBU[0015] pulling tc-image                              image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0015] &{Pulling from alexei-led/pumba-alpine-nettools   {0 0}}
DEBU[0015] &{Digest: sha256:61d1b60f2762edd46df25df72f2745fabf563961847b236cc89513897347a243   {0 0}}
DEBU[0015] &{Status: Image is up to date for ghcr.io/alexei-led/pumba-alpine-nettools:latest   {0 0}}
DEBU[0016] creating tc-container                         image="ghcr.io/alexei-led/pumba-alpine-nettools:latest"
DEBU[0016] tc container created, starting it             id=6b297e738efc66191ed273fe9d371b5c26a1b2c0c140836291a1d8a70bf845ae
DEBU[0016] run command on tc-container                   args="qdisc del dev eth0 root netem"

Aditional info

The container ifconfig:

> docker run -it --rm --name ping  alpine ifconfig
eth0      Link encap:Ethernet  HWaddr 3A:29:A4:B3:83:9C
          inet addr:172.17.0.2  Bcast:172.17.255.255  Mask:255.255.0.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:314 (314.0 B)  TX bytes:42 (42.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)