Linux redhat7 udev Configuration __linux

This article mainly describes how to use Udev to set user-defined device names in Oracle Linux 7. The Setup method in Oracle Linux 7 is significantly different from previous Linux versions.

The following example pairs the/DEV/SDB,/DEV/SDC by setting the Udev rules to create a user-defined device name
1. View Linux Version
[Root@linuxidc.com ~]# Uname-a
Linux linuxidc.com 3.8.13-55.1.6.el7uek.x86_64 #2 SMP Wed Feb 14:18:22 PST 2015 x86_64 x86_64 x86_64

2. Find the device's UUID
[Root@linuxidc.com ~]# Fdisk-l

disk/dev/sdb:5368 MB, 5368709120 bytes, 10485760 sectors
Units = sectors of 1 * the bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes
Disk label Type:dos
Disk identifier:0x41b4373b

Device Boot Start End Blocks Id System

disk/dev/sda:53.7 GB, 53687091200 bytes, 104857600 sectors
Units = sectors of 1 * the bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes
Disk label Type:dos
Disk IDENTIFIER:0X000209AA

Device Boot Start End Blocks Id System
/DEV/SDA1 * 2048 1026047 512000 Linux
/dev/sda2 1026048 104857599 51915776 8e Linux LVM

disk/dev/sdc:5368 MB, 5368709120 bytes, 10485760 sectors
Units = sectors of 1 * the bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes

disk/dev/mapper/ol-root:47.7 GB, 47747956736 bytes, 93257728 sectors
Units = sectors of 1 * the bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes

disk/dev/mapper/ol-swap:5368 MB, 5368709120 bytes, 10485760 sectors
Units = sectors of 1 * the bytes
Sector size (logical/physical): bytes/512 bytes
I/O size (minimum/optimal): bytes/512 bytes

[Root@linuxidc.com dev]#/usr/lib/udev/scsi_id-g-u/dev/sdb
36000c294ae49672e100c14f8d1708ba0
[Root@linuxidc.com dev]#/usr/lib/udev/scsi_id-g-U/DEV/SDC
36000c2952e94e2262a0c351bbb9817eb

Note: If you are using the Vmvare virtual machine, then the display UUID needs to add disk.enableuuid = "TRUE" in the Vmx file, where I use the vmvare virtual machine, vmx file in the corresponding virtual machine adds Disk.enableuuid = " TRUE "
~ # VI/VMFS/VOLUMES/581C05D5-12B526B2-F04F-5C260AFD5108/ORACLE_LINUX7_1/ORACLE_LINUX7_1.VMX
. Encoding = "UTF-8"
Disk. Enableuuid= "TRUE"
... Omitted...

3. Create a new Udev rule
[Root@linuxidc.com dev]# Vi/etc/udev/rules.d/99-my-asmdevices.rules

kernel== "sd*[!0-9]", env{devtype}== "Disk", subsystem== "block", program== "/usr/lib/udev/scsi_id-g-u-d $devnode", result== "36000c294ae49672e100c14f8d1708ba0", run+= "/bin/sh-c ' mknod/dev/asmdisk01 b $major $minor; Chown grid:oinstall/dev/asmdisk01; chmod 0660/dev/asmdisk01 ' "

kernel== "sd*[!0-9]", env{devtype}== "Disk", subsystem== "block", program== "/usr/lib/udev/scsi_id-g-u-d $devnode", result== "36000c2952e94e2262a0c351bbb9817eb", run+= "/bin/sh-c ' mknod/dev/asmdisk02 b $major $minor; Chown grid:oinstall/dev/asmdisk02; chmod 0660/dev/asmdisk02 ' "

4. Test the new Udev rule
Perform the following command or reboot to verify the new Udev rule
4.1 Check the new device name:
[root@linuxidc.com dev]#/sbin/udevadm Trigger--type=devices--action=change

[Root@linuxidc.com dev]# LS-LRT asm*
BRW-RW----. 1 grid Oinstall 8, Dec 18:32 asmdisk02
BRW-RW----. 1 grid Oinstall 8, Dec 18:32 asmdisk01

4.2 To reload Udev rule execute the following command:
[root@linuxidc.com dev]#/sbin/udevadm Control--reload

4.3 In order to diagnose Udev rule, execute the following command:
[Root@linuxidc.com dev]#/sbin/udevadm Test/sys/block/sdb
Calling:test
Version 208
This are for debugging only, it does the not run no program
specified by a RUN key. It may show incorrect results, because
Some values may is different, or not available at a simulation run.

= = = Trie On-disk = =
Tool version:208
File size:6376691 bytes
Header size bytes
Strings 1401963 bytes
Nodes 4974648 bytes
Load Module Index
Read rules file:/usr/lib/udev/rules.d/10-dm.rules
Read rules file:/usr/lib/udev/rules.d/100-balloon.rules
Read rules file:/usr/lib/udev/rules.d/11-dm-lvm.rules
Read rules file:/usr/lib/udev/rules.d/11-dm-mpath.rules
Read rules file:/usr/lib/udev/rules.d/13-dm-disk.rules
Read rules file:/usr/lib/udev/rules.d/40-libgphoto2.rules
IMPORT found Builtin ' usb_id--export%%p ', replacing/usr/lib/udev/rules.d/40-libgphoto2.rules:11
Read rules file:/usr/lib/udev/rules.d/40-redhat.rules
Read rules file:/usr/lib/udev/rules.d/40-usb-media-players.rules
Read rules file:/usr/lib/udev/rules.d/40-usb_modeswitch.rules
Read rules file:/usr/lib/udev/rules.d/42-usb-hid-pm.rules
Read rules file:/usr/lib/udev/rules.d/50-rbd.rules
Read rules file:/usr/lib/udev/rules.d/50-udev-default.rules
Read rules file:/usr/lib/udev/rules.d/56-hpmud.rules
Read rules file:/usr/lib/udev/rules.d/60-alias-kmsg.rules
Read rules file:/usr/lib/udev/rules.d/60-cdrom_id.rules
Read rules file:/usr/lib/udev/rules.d/60-fprint-autosuspend.rules
Read rules file:/usr/lib/udev/rules.d/60-keyboard.rules
Read rules file:/usr/lib/udev/rules.d/60-net.rules
Read rules file:/usr/lib/udev/rules.d/60-persistent-alsa.rules
Read rules file:/usr/lib/udev/rules.d/60-persistent-input.rules
Read rules file:/usr/lib/udev/rules.d/60-persistent-serial.rules
Read rules file:/usr/lib/udev/rules.d/60-persistent-storage-tape.rules
Read rules file:/usr/lib/udev/rules.d/60-persistent-storage.rules
Read rules file:/usr/lib/udev/rules.d/60-persistent-v4l.rules
Read rules file:/usr/lib/udev/rules.d/60-raw.rules
Read rules file:/usr/lib/udev/rules.d/61-accelerometer.rules
Read rules file:/usr/lib/udev/rules.d/61-gnome-bluetooth-rfkill.rules
Read rules file:/usr/lib/udev/rules.d/62-multipath.rules
Read rules file:/usr/lib/udev/rules.d/63-md-raid-arrays.rules
Read rules file:/usr/lib/udev/rules.d/64-btrfs.rules
Read rules file:/usr/lib/udev/rules.d/65-libwacom.rules
Read rules file:/usr/lib/udev/rules.d/65-md-incremental.rules
Read rules file:/usr/lib/udev/rules.d/65-sane-backends.rules
Read rules file:/usr/lib/udev/rules.d/69-cd-sensors.rules
IMPORT found Builtin ' usb_id--export%p ', replacing/usr/lib/udev/rules.d/69-cd-sensors.rules:89
Read rules file:/usr/lib/udev/rules.d/69-dm-lvm-metad.rules
Read rules file:/usr/lib/udev/rules.d/69-libmtp.rules
Read rules file:/usr/lib/udev/rules.d/69-xorg-vmmouse.rules
Read rules file:/etc/udev/rules.d/70-persistent-ipoib.rules
Read rules file:/usr/lib/udev/rules.d/70-power-switch.rules
Read rules file:/usr/lib/udev/rules.d/70-printers.rules
Read rules file:/usr/lib/udev/rules.d/70-spice-vdagentd.rules
Read rules file:/usr/lib/udev/rules.d/70-touchpad-quirks.rules
Read rules file:/usr/lib/udev/rules.d/70-uaccess.rules
Read rules file:/usr/lib/udev/rules.d/70-wacom.rules
Read rules file:/usr/lib/udev/rules.d/71-biosdevname.rules
Read rules file:/usr/lib/udev/rules.d/71-seat.rules
Read rules file:/usr/lib/udev/rules.d/73-idrac.rules
Read rules file:/usr/lib/udev/rules.d/73-seat-late.rules
Read rules file:/usr/lib/udev/rules.d/75-net-description.rules
Read rules file:/usr/lib/udev/rules.d/75-probe_mtd.rules
Read rules file:/usr/lib/udev/rules.d/75-tty-description.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-ericsson-mbm.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-huawei-net-port-types.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-longcheer-port-types.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-nokia-port-types.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-pcmcia-device-blacklist.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-platform-serial-whitelist.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-simtech-port-types.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-telit-port-types.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-usb-device-blacklist.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-usb-serial-adapters-greylist.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-x22x-port-types.rules
Read rules file:/usr/lib/udev/rules.d/77-mm-zte-port-types.rules
Read rules file:/usr/lib/udev/rules.d/77-nm-olpc-mesh.rules
Read rules file:/usr/lib/udev/rules.d/78-sound-card.rules
Read rules file:/usr/lib/udev/rules.d/80-drivers.rules
Read rules file:/usr/lib/udev/rules.d/80-kvm.rules
Read rules file:/usr/lib/udev/rules.d/80-mm-candidate.rules
Read rules file:/usr/lib/udev/rules.d/80-net-name-slot.rules
Read rules file:/usr/lib/udev/rules.d/80-udisks2.rules
Read rules file:/usr/lib/udev/rules.d/81-kvm-rhel.rules
Read rules file:/usr/lib/udev/rules.d/85-regulatory.rules
Read rules file:/usr/lib/udev/rules.d/85-usbmuxd.rules
Read rules file:/usr/lib/udev/rules.d/90-alsa-restore.rules
Read rules file:/usr/lib/udev/rules.d/90-alsa-tools-firmware.rules
Read rules file:/usr/lib/udev/rules.d/90-iprutils.rules
Read rules file:/usr/lib/udev/rules.d/90-pulseaudio.rules
Read rules file:/usr/lib/udev/rules.d/90-vconsole.rules
Read rules file:/usr/lib/udev/rules.d/91-drm-modeset.rules
Read rules file:/usr/lib/udev/rules.d/95-cd-devices.rules
Read rules file:/usr/lib/udev/rules.d/95-dm-notify.rules
Read rules file:/usr/lib/udev/rules.d/95-udev-late.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-battery-recall-dell.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-battery-recall-fujitsu.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-battery-recall-gateway.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-battery-recall-ibm.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-battery-recall-lenovo.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-battery-recall-toshiba.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-csr.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-hid.rules
Read rules file:/usr/lib/udev/rules.d/95-upower-wup.rules
Read rules file:/usr/lib/udev/rules.d/97-bluetooth-serial.rules
Read rules file:/usr/lib/udev/rules.d/98-kexec.rules
Read rules file:/usr/lib/udev/rules.d/98-rdma.rules
Read rules file:/etc/udev/rules.d/99-my-asmdevices.rules
Read rules file:/usr/lib/udev/rules.d/99-qemu-guest-agent.rules
Read rules file:/usr/lib/udev/rules.d/99-systemd.rules
Rules contain 393216 bytes tokens (32768 * bytes), 38852 bytes
30460 strings (257150 bytes), 27006 de-duplicated (221753 bytes), 3455 trie nodes
GROUP 6/usr/lib/udev/rules.d/50-udev-default.rules:51
IMPORT ' scsi_id--export--whitelisted-d/dev/sdb '/usr/lib/udev/rules.d/60-persistent-storage.rules:40
Starting ' scsi_id--export--whitelisted-d/dev/sdb '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' Id_scsi=1 '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' Id_vendor=vmware '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' id_vendor_enc=vmware\x20\x20 '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' Id_model=virtual_disk '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' Id_model_enc=virtual\x20disk \x20\x20\x20\x20 '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' id_revision=1.0 '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' Id_type=disk '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' id_serial=36000c294ae49672e100c14f8d1708ba0 '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' id_serial_short=6000c294ae49672e100c14f8d1708ba0 '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' id_wwn=0x6000c294ae49672e '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' id_wwn_vendor_extension=0x100c14f8d1708ba0 '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' id_wwn_with_extension=0x6000c294ae49672e100c14f8d1708ba0 '
' scsi_id--export--whitelisted-d/dev/sdb ' (out) ' id_scsi_serial=6000c294ae49672e100c14f8d1708ba0 '
' scsi_id--export--whitelisted-d/dev/sdb ' [24105] exit with return code 0
LINK ' disk/by-id/scsi-36000c294ae49672e100c14f8d1708ba0 '/usr/lib/udev/rules.d/60-persistent-storage.rules:42
IMPORT builtin ' path_id '/usr/lib/udev/rules.d/60-persistent-storage.rules:58
LINK ' disk/by-path/pci-0000:02:01.0-scsi-0:0:0:0 '/usr/lib/udev/rules.d/60-persistent-storage.rules:59
IMPORT builtin ' Blkid '/usr/lib/udev/rules.d/60-persistent-storage.rules:73
Probe/dev/sdb raid offset=0
LINK ' disk/by-id/wwn-0x6000c294ae49672e100c14f8d1708ba0 '/usr/lib/udev/rules.d/60-persistent-storage.rules:83
Program '/usr/lib/udev/scsi_id-g-u-d/dev/sdb '/etc/udev/rules.d/99-my-asmdevices.rules:2
Starting '/usr/lib/udev/scsi_id-g-u-d/dev/sdb '
'/usr/lib/udev/scsi_id-g-u-d/dev/sdb ' (out) ' 36000c294ae49672e100c14f8d1708ba0 '
'/usr/lib/udev/scsi_id-g-u-d/dev/sdb ' [24106] exit with return code 0
RUN '/bin/sh-c ' mknod/dev/asmdisk01 b $major $minor; Chown grid:oinstall/dev/asmdisk01; chmod 0660/dev/asmdisk01 '/etc/udev/rules.d/99-my-asmdevices.rules:2
Program '/usr/lib/udev/scsi_id-g-u-d/dev/sdb '/etc/udev/rules.d/99-my-asmdevices.rules:4
Starting '/usr/lib/udev/scsi_id-g-u-d/dev/sdb '
'/usr/lib/udev/scsi_id-g-u-d/dev/sdb ' (out) ' 36000c294ae49672e100c14f8d1708ba0 '
'/usr/lib/udev/scsi_id-g-u-d/dev/sdb ' [24107] exit with return code 0
Handling Device node '/dev/sdb ', devnum=b8:16, mode=0660, Uid=0, gid=6
Set Permissions/dev/sdb, 060660, Uid=0, gid=6
Preserve already existing symlink '/dev/block/8:16 ' to '. /sdb '
Found ' b8:16 ' claiming '/run/udev/links/\x2fdisk\x2fby-id\x2fscsi-36000c294ae49672e100c14f8d1708ba0 '
Creating link '/dev/disk/by-id/scsi-36000c294ae49672e100c14f8d1708ba0 ' to '/dev/sdb '
Preserve already existing symlink '/dev/disk/by-id/scsi-36000c294ae49672e100c14f8d1708ba0 ' to '. /.. /sdb '
Found ' b8:16 ' claiming '/run/udev/links/\x2fdisk\x2fby-id\x2fwwn-0x6000c294ae49672e100c14f8d1708ba0 '
Creating link '/dev/disk/by-id/wwn-0x6000c294ae49672e100c14f8d1708ba0 ' to '/dev/sdb '
Preserve already existing symlink '/dev/disk/by-id/wwn-0x6000c294ae49672e100c14f8d1708ba0 ' to '. /.. /sdb '
Found ' b8:16 ' claiming '/run/udev/links/\x2fdisk\x2fby-path\x2fpci-0000:02:01.0-scsi-0:0:0:0 '
Creating link '/dev/disk/by-path/pci-0000:02:01.0-scsi-0:0:0:0 ' to '/dev/sdb '
Preserve already existing symlink '/dev/disk/by-path/pci-0000:02:01.0-scsi-0:0:0:0 ' to '. /.. /sdb '
. id_fs_type_new=
Action=add
devlinks=/dev/disk/by-id/scsi-36000c294ae49672e100c14f8d1708ba0/dev/disk/by-id/wwn- 0x6000c294ae49672e100c14f8d1708ba0/dev/disk/by-path/pci-0000:02:01.0-scsi-0:0:0:0
Devname=/dev/sdb
DEVPATH=/DEVICES/PCI0000:00/0000:00:11.0/0000:02:01.0/HOST3/TARGET3:0:0/3:0:0:0/BLOCK/SD b
Devtype=disk
Id_bus=scsi
Id_fs_type=
Id_model=virtual_disk
id_model_enc=virtual\x20disk\x20\x20\x20\x20
Id_part_table_type=dos
id_path=pci-0000:02:01.0-scsi-0:0:0:0
Id_path_tag=pci-0000_02_01_0-scsi-0_0_0_0
id_revision=1.0
Id_scsi=1
Id_scsi_serial=6000c294ae49672e100c14f8d1708ba0
Id_serial=36000c294ae49672e100c14f8d1708ba0
Id_serial_short=6000c294ae49672e100c14f8d1708ba0
Id_type=disk
Id_vendor=vmware
id_vendor_enc=vmware\x20\x20
id_wwn=0x6000c294ae49672e
Id_wwn_vendor_extension=0x100c14f8d1708ba0
Id_wwn_with_extension=0x6000c294ae49672e100c14f8d1708ba0
Major=8
Minor=16
Mpath_sbin_path=/sbin
Subsystem=block
TAGS=:SYSTEMD:
usec_initialized=545736
Run: '/bin/sh-c ' mknod/dev/asmdisk01 b 8 16; Chown grid:oinstall/dev/asmdisk01; chmod 0660/dev/asmdisk01 '
Unload Module Index

4.4 You can delete device files manually if you no longer need device
[Root@linuxidc.com dev]#/bin/rm/dev/asmdisk01
[Root@linuxidc.com dev]#/bin/rm/dev/asmdisk02
[Root@linuxidc.com dev]# LS-LRT asm*
Ls:cannot Access asm*: No such file or directory