DRBD : Configure2015/03/10 |
|
Configure DRBD after installing.
This example is based on the environment like follows. +----------------------+ | +----------------------+ | [ DRBD Server#1 ] |10.0.0.30 | 10.0.0.31| [ DRBD Server#2 ] | | drbd01.srv.world +----------+----------+ drbd02.srv.world | | | | | +----------------------+ +----------------------+
It's necessarry the server you'd like to install DRBD has free block-device.
This example shows to configure to use a block-device "/dev/vg_r0/lv_r0".
|
|
| [1] | Configure DRBD on both Hosts. |
|
[root@drbd01 ~]#
vi /etc/drbd.d/global_common.conf # add follows in the disk section ( detach disk if IO errors happen ) disk {
on-io-error detach;
[root@drbd01 ~]#
vi /etc/drbd.d/r0.res # create new
resource r0 {
# DRBD device device /dev/drbd0; # block device disk /dev/vg_r0/lv_r0; meta-disk internal; on drbd01.srv.world { # IP address:port address 10.0.0.30:7788; } on drbd02.srv.world { address 10.0.0.31:7788; } } # load module [root@drbd01 ~]# modprobe drbd [root@drbd01 ~]# drbd 343511 0 libcrc32c 1246 1 drbd # create DRBD resource [root@drbd01 ~]# drbdadm create-md r0 --== Thank you for participating in the global usage survey ==-- The server's response is: ... ...[need to type 'yes' to confirm] yes initializing activity log NOT initializing bitmap Writing meta data... New drbd meta data block successfully created. success[root@drbd01 ~]# /etc/rc.d/init.d/drbd start
Starting DRBD resources: [
create res: r0
prepare disk: r0
adjust disk: r0drbd r0: Starting worker thread (from drbdsetup-84 [17259])
...
...
To abort waiting enter 'yes' [ 18]:
[root@drbd01 ~]# yes
chkconfig drbd on [root@drbd01 ~]# echo "/sbin/modprobe drbd" >> /etc/rc.local |
| [2] | After configuring on both Hosts, sync data on a Host. |
|
# current status is "Secondary/Secondary" [root@drbd01 ~]# cat /proc/drbd
version: 8.4.5 (api:1/proto:86-101)
GIT-hash: 1d360bde0e095d495786eaeb2a1ac76888e4db96 build by root@drbd01.srv.world, 2015-03-11 17:20:57
0: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent C r-----
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:83879388
# get primary role and sync data [root@drbd01 ~]# drbdadm -- --overwrite-data-of-peer primary r0
# start sync [root@drbd01 ~]# cat /proc/drbd
version: 8.4.5 (api:1/proto:86-101)
GIT-hash: 1d360bde0e095d495786eaeb2a1ac76888e4db96 build by root@drbd01.srv.world, 2015-03-11 17:20:57
0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r-----
ns:129216 nr:0 dw:0 dr:129880 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:83750172
[>....................] sync'ed: 0.2% (81784/81912)M
finish: 3:03:05 speed: 7,600 (7,600) K/sec
# after syncing, the status turns like follows [root@drbd01 ~]# cat /proc/drbd
version: 8.4.5 (api:1/proto:86-101)
GIT-hash: 1d360bde0e095d495786eaeb2a1ac76888e4db96 build by root@drbd01.srv.world, 2015-03-11 17:20:57
0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
ns:83879388 nr:0 dw:0 dr:83880052 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0
|
| [3] | It's OK to configure DRBD, create file system on DRBD device and mount it to use. |
|
[root@drbd01 ~]# mkfs.ext4 /dev/drbd0 [root@drbd01 ~]# mkdir /drbd_disk [root@drbd01 ~]# mount /dev/drbd0 /drbd_disk [root@drbd01 ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 16G 1.4G 14G 10% /
tmpfs tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/vda1 ext4 477M 119M 333M 27% /boot
/dev/drbd0 ext4 79G 56M 75G 1% /drbd_disk
# try to create a test file [root@drbd01 ~]# touch /drbd_disk/test.txt [root@drbd01 ~]# ll /drbd_disk total 16 drwx------ 2 root root 16384 Mar 12 12:01 lost+found -rw-r--r-- 1 root root 0 Mar 12 12:52 test.txt |
| [4] | To mount DRBD device on the secondary Host, do it like follows. |
|
########### on primary Host ########### # unmount and get secondary role [root@drbd01 ~]# umount /drbd_disk [root@drbd01 ~]# drbdadm secondary r0
########### on secondary Host ########### # get primary role and mount [root@drbd02 ~]# drbdadm primary r0 [root@drbd02 ~]# mount /dev/drbd0 /drbd_disk [root@drbd02 ~]# df -hT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root
ext4 16G 1.4G 14G 10% /
tmpfs tmpfs 1.9G 0 1.9G 0% /dev/shm
/dev/vda1 ext4 477M 119M 333M 27% /boot
/dev/drbd0 ext4 79G 56M 75G 1% /drbd_disk
|
| Sponsored Link |
|
|