Udev - ネットワークケーブルホットプラグイベントがキャプチャされない

Question

この udev ルールとスクリプトは、ネットワークインターフェイスの変更をキャプチャします。

/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ログに書き込むスクリプト：

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

再起動しなくてもテストできます。

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

その後、ログを確認してくださいjournalctl -xe。

systemd を使用しない場合は、次を実行します。

削除/usr/bin/systemd-catしてorRUN+=".." またはechologger "..."echo "stuff" > /dev/kmsgディストリビューションで使用される他の方法

また、仮想インターフェイスを追加してログイベントを表示できます。

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

udevadm次のように、インターフェースに関する多くの情報を見つけることもできます。

# 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==""

以下はsysファイルにリンクされています。

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

udevadm monitor可能:

# 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