Come utilizzare le regole Udev per creare dischi oracleasm in CentOS/RHEL 8

Questo post aiuterà a configurare i dischi Oracleasm utilizzando le regole Udev in un cluster a 2 nodi.

Sul primo nodo

1. Elenca i dischi:

[root@node01 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda  8:0     0  2G   0       disk
sdb  8:16    0  2G   0       disk

Nota :Crea partizioni per i dischi.

2. Trova l'ID del disco:

[root@node01 ~]# udevadm info --query=all --name=/dev/sda | egrep "WWN|SERIAL"
E: ID_SCSI_SERIAL=[id]
E: ID_SERIAL=0QEMU_QEMU_HARDDISK_AAAAAAAAA
E: ID_SERIAL_SHORT=[id]
E: SCSI_IDENT_SERIAL=[id]

[root@node01 ~]# udevadm info --query=all --name=/dev/sdb | egrep "WWN|SERIAL"
E: ID_SCSI_SERIAL=[id]
E: ID_SERIAL=0QEMU_QEMU_HARDDISK_BBBBBBBBB
E: ID_SERIAL_SHORT=[id]
E: SCSI_IDENT_SERIAL=[id]

3. Crea un nuovo file 96-asm.rules :

[root@node01 ~]# touch /etc/udev/rules.d/96-asm.rules

4. Aggiungi il file 96-asm.rules con le informazioni rilevate sull'ID disco:

[root@node01 ~]# vim /etc/udev/rules.d/96-asm.rules
## Disk /dev/sda
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL}=="0QEMU_QEMU_HARDDISK_AAAAAAAAA", SYMLINK+="oracleasm/DATA1", OWNER="oracle", GROUP="dba", MODE="0660"
## Disk /dev/sdb
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL}=="0QEMU_QEMU_HARDDISK_BBBBBBBBB", SYMLINK+="oracleasm/DATA2", OWNER="oracle", GROUP="dba", MODE="0660"

5. Ricarica udev/rules:

[root@node01 ~]# udevadm control --reload-rules

[root@node01 ~]# udevadm trigger --type=devices --action=change

6. Elenca il disco dell'oraclea:

[root@node01 ~]# ll /dev/oracleasm/DATA*
lrwxrwxrwx. 1 root root 6 Sep 28 14:24 /dev/oracleasm/DATA1 -> ../sda
lrwxrwxrwx. 1 root root 6 Sep 28 14:24 /dev/oracleasm/DATA2 -> ../sdb
[root@node01 ~]#

Sul secondo nodo

1. Elenca i dischi:

[root@node02 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda  8:0     0  2G   0       disk
sdb  8:16    0  2G   0       disk

Nota :/dev/sd* il nome dei dispositivi non persisterà dopo il riavvio, trova con l'id del disco.

2. Trova l'ID del disco:

[root@node02 ~]# udevadm info --query=all --name=/dev/sdb | egrep "WWN|SERIAL"
E: ID_SCSI_SERIAL=[id]
E: ID_SERIAL=0QEMU_QEMU_HARDDISK_AAAAAAAAA
E: ID_SERIAL_SHORT=[id]
E: SCSI_IDENT_SERIAL=[id]

[root@node02 ~]# udevadm info --query=all --name=/dev/sdc | egrep "WWN|SERIAL"
E: ID_SCSI_SERIAL=[id]
E: ID_SERIAL=0QEMU_QEMU_HARDDISK_BBBBBBBBB
E: ID_SERIAL_SHORT=[id]
E: SCSI_IDENT_SERIAL=[id]

3. Crea un nuovo file 96-asm.rules :

[root@node02 ~]# touch /etc/udev/rules.d/96-asm.rules

4. Copiare 96-asm.rules da un altro nodo o creare una nuova voce con le informazioni rilevate:

[root@node02 ~]# vim /etc/udev/rules.d/96-asm.rules
## Disk /dev/sdb
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL}=="0QEMU_QEMU_HARDDISK_AAAAAAAAA", SYMLINK+="oracleasm/DATA1", OWNER="oracle", GROUP="dba", MODE="0660"
## Disk /dev/sdc
KERNEL=="sd*", SUBSYSTEM=="block", ENV{ID_SERIAL}=="0QEMU_QEMU_HARDDISK_BBBBBBBBB", SYMLINK+="oracleasm/DATA2", OWNER="oracle", GROUP="dba", MODE="0660"

5. Ricarica udev/rules:

[root@node02 ~]# udevadm control --reload-rules

[root@node02 ~]# udevadm trigger --type=devices --action=change

6. Elenca il disco dell'oraclea:

[root@node02 ~]# ll /dev/oracleasm/DATA*
lrwxrwxrwx. 1 root root 6 Sep 28 14:57 /dev/oracleasm/DATA1 -> ../sdb
lrwxrwxrwx. 1 root root 6 Sep 28 14:57 /dev/oracleasm/DATA2 -> ../sdc
[root@node02 ~]#

Nota :Per il dispositivo multipath, utilizzare il nome del dispositivo di conseguenza.