Udev - 네트워크 케이블 핫플러그 이벤트가 캡처되지 않음

Question

이 udev 규칙 및 스크립트는 네트워크 인터페이스 변경 사항을 캡처합니다.

/etc/udev/rules.d/90-netifchanges.rules:

# Call custom script when ethernet device(s) are changed/added/removed/etc in system
SUBSYSTEM=="net" \
, RUN+="/usr/bin/systemd-cat /usr/local/bin/netifchanges.sh '$env{ACTION}' '$name' '$id' '$sys$devpath'"

/usr/local/bin/netifchanges.shsystemd 로그에 기록하는 스크립트:

#!/bin/bash -e
    
action=$1
ifname=$2
id=$3
syspath=$4
    
echo "Network interface $ifname ($id) $action"
printenv

재부팅하지 않고도 테스트할 수 있습니다.

udevadm control --reload-rules && udevadm -d trigger -v --type devices --subsystem-match net

그런 다음 로그를 확인하십시오 journalctl -xe.

systemd를 사용하지 않는 경우 다음을 실행하십시오.

삭제 /usr/bin/systemd-cat하고 or RUN+=".." 또는echologger "..."echo "stuff" > /dev/kmsg배포판에서 사용되는 다른 방법

또한 가상 인터페이스를 추가하여 로그 이벤트를 볼 수 있습니다.

# ip link add dummy0 type dummy
# ip link set dummy0 up
# ip link set dummy0 down
# ip link delete dummy0

udevadm다음과 같이 인터페이스에 대한 많은 정보를 찾을 수도 있습니다 .

# udevadm info -a /sys/class/net/eno1

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/pci0000:00/0000:00:19.0/net/eno1':
    KERNEL=="eno1"
    SUBSYSTEM=="net"
    DRIVER==""
    ATTR{gro_flush_timeout}=="0"
    ATTR{proto_down}=="0"
    ATTR{addr_assign_type}=="0"
    ATTR{flags}=="0x1103"
    ATTR{netdev_group}=="0"
    ATTR{name_assign_type}=="4"
    ATTR{broadcast}=="ff:ff:ff:ff:ff:ff"
    ATTR{operstate}=="up"
    ATTR{link_mode}=="0"
    ATTR{dev_port}=="0"
    ATTR{address}=="74:d0:2b:2c:6e:d7"
    ATTR{duplex}=="full"
    ATTR{carrier_changes}=="4"
    ATTR{type}=="1"
    ATTR{addr_len}=="6"
    ATTR{dev_id}=="0x0"
    ATTR{iflink}=="3"
    ATTR{mtu}=="1500"
    ATTR{speed}=="1000"
    ATTR{carrier_down_count}=="2"
    ATTR{ifalias}==""
    ATTR{carrier_up_count}=="2"
    ATTR{ifindex}=="3"
    ATTR{carrier}=="1"
    ATTR{tx_queue_len}=="1000"
    ATTR{dormant}=="0"

  looking at parent device '/devices/pci0000:00/0000:00:19.0':
    KERNELS=="0000:00:19.0"
    SUBSYSTEMS=="pci"
    DRIVERS=="e1000e"
    ATTRS{device}=="0x1503"
    ATTRS{label}==" Onboard LAN"
    ATTRS{enable}=="1"
    ATTRS{irq}=="56"
    ATTRS{subsystem_vendor}=="0x1043"
    ATTRS{devspec}==""
    ATTRS{revision}=="0x06"
    ATTRS{subsystem_device}=="0x849c"
    ATTRS{local_cpus}=="ff"
    ATTRS{local_cpulist}=="0-7"
    ATTRS{class}=="0x020000"
    ATTRS{driver_override}=="(null)"
    ATTRS{broken_parity_status}=="0"
    ATTRS{msi_bus}=="1"
    ATTRS{vendor}=="0x8086"
    ATTRS{consistent_dma_mask_bits}=="64"
    ATTRS{ari_enabled}=="0"
    ATTRS{index}=="1"
    ATTRS{numa_node}=="-1"
    ATTRS{d3cold_allowed}=="1"
    ATTRS{dma_mask_bits}=="64"

  looking at parent device '/devices/pci0000:00':
    KERNELS=="pci0000:00"
    SUBSYSTEMS==""
    DRIVERS==""

다음은 sys 파일에 연결되어 있습니다.

# cat /sys/class/net/eno1/operstate 
up

udevadm monitor도 가능:

# udevadm -d monitor -p -k -u --subsystem-match=net
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[99386.755966] add      /devices/virtual/net/dummy0 (net)
ACTION=add
DEVPATH=/devices/virtual/net/dummy0
SUBSYSTEM=net
INTERFACE=dummy0
IFINDEX=12
SEQNUM=6842

rx-0: sd-device-monitor: Received device does not pass filter, ignoring
tx-0: sd-device-monitor: Received device does not pass filter, ignoring
UDEV  [99386.773912] add      /devices/virtual/net/dummy0 (net)
ACTION=add
DEVPATH=/devices/virtual/net/dummy0
SUBSYSTEM=net
INTERFACE=dummy0
IFINDEX=12
SEQNUM=6842
USEC_INITIALIZED=99386759873
ID_NET_NAMING_SCHEME=v240
ID_MM_CANDIDATE=1
ID_NET_DRIVER=dummy
ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
SYSTEMD_ALIAS=/sys/subsystem/net/devices/dummy0
TAGS=:systemd:

rx-0: sd-device-monitor: Received device does not pass filter, ignoring
tx-0: sd-device-monitor: Received device does not pass filter, ignoring
KERNEL[99392.704357] remove   /devices/virtual/net/dummy0 (net)
ACTION=remove
DEVPATH=/devices/virtual/net/dummy0
SUBSYSTEM=net
INTERFACE=dummy0
IFINDEX=12
SEQNUM=6847

UDEV  [99392.715832] remove   /devices/virtual/net/dummy0 (net)
ACTION=remove
DEVPATH=/devices/virtual/net/dummy0
SUBSYSTEM=net
INTERFACE=dummy0
IFINDEX=12
SEQNUM=6847
USEC_INITIALIZED=99386759873
ID_NET_NAMING_SCHEME=v240
ID_MM_CANDIDATE=1
ID_NET_DRIVER=dummy
ID_NET_LINK_FILE=/usr/lib/systemd/network/99-default.link
SYSTEMD_ALIAS=/sys/subsystem/net/devices/dummy0
TAGS=:systemd:

Answer 1