Linux udev: Difference between revisions
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==Persistent network interface names== | ==Persistent network interface names== | ||
If you have no <i>/etc/udev/rules.d/70-persistent-net.rules</i> just create one: | If you have no <i>/etc/udev/rules.d/70-persistent-net.rules</i> just create one: | ||
< | <syntaxhighlight lang=bash> | ||
# lshw -C network | awk '/logical name:/{iface=$NF;}/serial:/{mac=$NF;printf "SUBSYSTEM==\"net\", ACTION==\"add\", DRIVERS==\"?*\", ATTR{address}==\"%s\", ATTR{dev_id}==\"0x0\", ATTR{type}==\"1\", KERNEL==\"eth*\", NAME=\"%s\"\n",mac,iface;}' >> /etc/udev/rules.d/70-persistent-net.rules | # lshw -C network | awk '/logical name:/{iface=$NF;}/serial:/{mac=$NF;printf "SUBSYSTEM==\"net\", ACTION==\"add\", DRIVERS==\"?*\", ATTR{address}==\"%s\", ATTR{dev_id}==\"0x0\", ATTR{type}==\"1\", KERNEL==\"eth*\", NAME=\"%s\"\n",mac,iface;}' >> /etc/udev/rules.d/70-persistent-net.rules | ||
</source> | </source> | ||
or add a specific interface to <i>/etc/udev/rules.d/70-persistent-net.rules</i>: | or add a specific interface to <i>/etc/udev/rules.d/70-persistent-net.rules</i>: | ||
< | <syntaxhighlight lang=bash> | ||
# MATCHADDR="00:50:56:a1:20:22" INTERFACE=eth2 /lib/udev/write_net_rules | # MATCHADDR="00:50:56:a1:20:22" INTERFACE=eth2 /lib/udev/write_net_rules | ||
</source> | </source> | ||
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Change order with: | Change order with: | ||
< | <syntaxhighlight lang=bash> | ||
# vi /etc/udev/rules.d/70-persistent-net.rules | # vi /etc/udev/rules.d/70-persistent-net.rules | ||
</source> | </source> | ||
Then let udev reread the file: | Then let udev reread the file: | ||
< | <syntaxhighlight lang=bash> | ||
# udevadm trigger --action=add --subsystem-match=net --verbose | # udevadm trigger --action=add --subsystem-match=net --verbose | ||
</source> | </source> | ||
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===Make your rule=== | ===Make your rule=== | ||
< | <syntaxhighlight lang=bash> | ||
root@mysql:~# cat /etc/udev/rules.d/99-lvm-mysql-permissions.rules | root@mysql:~# cat /etc/udev/rules.d/99-lvm-mysql-permissions.rules | ||
# udevadm info --query=all --name /dev/vg-data/lv-rawdisk-innodb01 | # udevadm info --query=all --name /dev/vg-data/lv-rawdisk-innodb01 | ||
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===Test your rule=== | ===Test your rule=== | ||
< | <syntaxhighlight lang=bash> | ||
root@mysql:~# ls -al /dev/vg-data/lv-rawdisk-innodb01 | root@mysql:~# ls -al /dev/vg-data/lv-rawdisk-innodb01 | ||
lrwxrwxrwx 1 root root 7 Aug 12 14:45 /dev/vg-data/lv-rawdisk-innodb01 -> ../dm-0 | lrwxrwxrwx 1 root root 7 Aug 12 14:45 /dev/vg-data/lv-rawdisk-innodb01 -> ../dm-0 | ||
| Line 47: | Line 47: | ||
After that: | After that: | ||
< | <syntaxhighlight lang=bash> | ||
root@mysql:~# id -a mysql | root@mysql:~# id -a mysql | ||
uid=108(mysql) gid=114(mysql) groups=114(mysql) | uid=108(mysql) gid=114(mysql) groups=114(mysql) | ||
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===Trigger your rule=== | ===Trigger your rule=== | ||
< | <syntaxhighlight lang=bash> | ||
root@mysql:~# udevadm trigger | root@mysql:~# udevadm trigger | ||
root@mysql:~# ls -alL /dev/vg-data/lv-rawdisk-innodb01 | root@mysql:~# ls -alL /dev/vg-data/lv-rawdisk-innodb01 | ||
brw-rw---- 1 mysql mysql 252, 0 Aug 12 15:07 /dev/vg-data/lv-rawdisk-innodb01 | brw-rw---- 1 mysql mysql 252, 0 Aug 12 15:07 /dev/vg-data/lv-rawdisk-innodb01 | ||
</source> | </source> | ||
Revision as of 22:22, 25 November 2021
Persistent network interface names
If you have no /etc/udev/rules.d/70-persistent-net.rules just create one: <syntaxhighlight lang=bash>
- lshw -C network | awk '/logical name:/{iface=$NF;}/serial:/{mac=$NF;printf "SUBSYSTEM==\"net\", ACTION==\"add\", DRIVERS==\"?*\", ATTR{address}==\"%s\", ATTR{dev_id}==\"0x0\", ATTR{type}==\"1\", KERNEL==\"eth*\", NAME=\"%s\"\n",mac,iface;}' >> /etc/udev/rules.d/70-persistent-net.rules
</source> or add a specific interface to /etc/udev/rules.d/70-persistent-net.rules: <syntaxhighlight lang=bash>
- MATCHADDR="00:50:56:a1:20:22" INTERFACE=eth2 /lib/udev/write_net_rules
</source>
Change order with:
<syntaxhighlight lang=bash>
- vi /etc/udev/rules.d/70-persistent-net.rules
</source> Then let udev reread the file: <syntaxhighlight lang=bash>
- udevadm trigger --action=add --subsystem-match=net --verbose
</source>
udev for MySQL on LVM with InnoDB on raw devices
Make your rule
<syntaxhighlight lang=bash> root@mysql:~# cat /etc/udev/rules.d/99-lvm-mysql-permissions.rules
- udevadm info --query=all --name /dev/vg-data/lv-rawdisk-innodb01
- DM_VG_NAME=vg-data
- DM_LV_NAME=lv-rawdisk-innodb01
ENV{DM_VG_NAME}=="vg-data" ENV{DM_LV_NAME}=="lv-rawdisk-innodb*" OWNER="mysql" GROUP="mysql" </source>
Test your rule
<syntaxhighlight lang=bash> root@mysql:~# ls -al /dev/vg-data/lv-rawdisk-innodb01 lrwxrwxrwx 1 root root 7 Aug 12 14:45 /dev/vg-data/lv-rawdisk-innodb01 -> ../dm-0
root@mysql:~# udevadm test /class/block/dm-0 ... read rules file: /etc/udev/rules.d/99-lvm-mysql-permissions.rules specified user 'mysql' unknown ... </source> OK user mysql unknown... maybe I should install MySQL ;-).
After that: <syntaxhighlight lang=bash> root@mysql:~# id -a mysql uid=108(mysql) gid=114(mysql) groups=114(mysql)
root@mysql:~# udevadm test /class/block/dm-0 ... OWNER 108 /etc/udev/rules.d/99-lvm-mysql-permissions.rules:4 GROUP 114 /etc/udev/rules.d/99-lvm-mysql-permissions.rules:4 handling device node '/dev/dm-0', devnum=b252:0, mode=0660, uid=108, gid=114 set permissions /dev/dm-0, 060660, uid=108, gid=114 ... </source>
Trigger your rule
<syntaxhighlight lang=bash> root@mysql:~# udevadm trigger root@mysql:~# ls -alL /dev/vg-data/lv-rawdisk-innodb01 brw-rw---- 1 mysql mysql 252, 0 Aug 12 15:07 /dev/vg-data/lv-rawdisk-innodb01 </source>
