테스트 환경 OS: CentOS 7
dr01 active 192.168.122.50 /dev/vdb
dr02 standby 192.168.122.60 /dev/vdb
1. hostname 설정 (dr01 , dr02)
[root@dr01 ~]# vi /etc/hosts 192.168.122.50 dr01 192.168.122.60 dr02
2. disk 준비 (dr01 , dr02)
[root@drbd01 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sr0 11:0 1 4.3G 0 rom
vda 253:0 0 20G 0 disk
├─vda1 253:1 0 1G 0 part /boot
├─vda2 253:2 0 1G 0 part [SWAP]
└─vda3 253:3 0 18G 0 part /
vdb 253:16 0 10G 0 disk
[root@drbd01 ~]#
[root@drbd01 ~]# fdisk /dev/vdb
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0x21877a4c.
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-20971519, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519):
Using default value 20971519
Partition 1 of type Linux and of size 10 GiB is set
Command (m for help): wq
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@drbd01 ~]#
3. drbd 패키지 설치 (dr01 , dr02)
[root@dr01 ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org [root@dr01 ~]# rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm Retrieving http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm Preparing... ################################# [100%] Updating / installing... 1:elrepo-release-7.0-3.el7.elrepo ################################# [100%] [root@dr01 ~]# [root@dr01 ~]# yum install -y kmod-drbd84 drbd84-utils
4. drbd 설정 (dr01 , dr02)
[root@dr01 ~]# mv /etc/drbd.d/global_common.conf /etc/drbd.d/global_common.conf.org
[root@dr01 ~]# vi /etc/drbd.d/global_common.conf
global {
usage-count yes;
}
common {
net {
protocol C;
}
}
[root@dr01 ~]# vi /etc/drbd.d/dr0.res
resource dr0 {
on dr01 {
device /dev/drbd0;
disk /dev/vdb1;
meta-disk internal;
address 192.168.122.50:7789;
}
on dr02 {
device /dev/drbd0;
disk /dev/vdb1;
meta-disk internal;
address 192.168.122.60:7789;
}
}
5. dr0 메터데이터 블록 생성
[root@dr01 ~]# drbdadm create-md dr0 initializing activity log initializing bitmap (320 KB) to all zero Writing meta data... New drbd meta data block successfully created. [root@dr01 ~]# [root@dr02 ~]# drbdadm create-md dr0 initializing activity log initializing bitmap (320 KB) to all zero Writing meta data... New drbd meta data block successfully created. [root@dr02 ~]#
6. drbd 데몬 구동 (dr01 , dr02)
[root@dr01 ~]# systemctl start drbd ; systemctl enable drbd [root@dr02 ~]# systemctl start drbd ; systemctl enable drbd
7. drbd primary 설정 (dr01 에서만 실행)
[root@dr01 ~]# drbdadm primary --force dr0
[root@dr01 ~]# drbdadm status dr0
dr0 role:Primary
disk:UpToDate
peer role:Secondary
replication:SyncSource peer-disk:Inconsistent done:0.29
[root@dr01 ~]#
[root@dr01 ~]# drbdadm -- --overwrite-data-of-peer primary dr0
8. 동기화 확인 (dr01 , dr02)
[root@dr01 ~]# cat /proc/drbd
version: 8.4.11-1 (api:1/proto:86-101)
GIT-hash: 66145a308421e9c124ec391a7848ac20203bb03c build by mockbuild@, 2018-11-03 01:26:55
0: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r-----
ns:455960 nr:0 dw:0 dr:458080 al:8 bm:0 lo:0 pe:7 ua:0 ap:0 ep:1 wo:f oos:10031116
[>....................] sync'ed: 4.4% (9796/10236)M
finish: 0:08:22 speed: 19,972 (13,732) K/sec
[root@dr01 ~]#
[root@dr02 ~]# cat /proc/drbd
version: 8.4.11-1 (api:1/proto:86-101)
GIT-hash: 66145a308421e9c124ec391a7848ac20203bb03c build by mockbuild@, 2018-11-03 01:26:55
0: cs:SyncTarget ro:Secondary/Primary ds:Inconsistent/UpToDate C r-----
ns:0 nr:1981844 dw:1981844 dr:0 al:8 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:8502536
[==>.................] sync'ed: 19.0% (8300/10236)M
finish: 0:03:48 speed: 37,124 (25,408) want: 41,040 K/sec
[root@dr02 ~]#
9. drbd 상태 확인
[root@dr01 ~]# drbdadm status dr0
dr0 role:Primary
disk:UpToDate
peer role:Secondary
replication:Established peer-disk:UpToDate
[root@dr01 ~]#
[root@dr02 ~]# drbdadm status dr0
dr0 role:Secondary
disk:UpToDate
peer role:Primary
replication:Established peer-disk:UpToDate
[root@dr02 ~]#
10. 디렉토리 추가 및 파일시스템 포멧
[root@dr01 ~]# mkdir /data [root@dr02 ~]# mkdir /data 포멧은 dr01 에서만 진행 합니다. [root@dr01 ~]# mkfs.xfs /dev/drbd0 drbd0 Device 를 /data 에 마운트 합니다. [root@dr01 ~]# mount /dev/drbd0 /data Test 를 위하여 0 ~ 5 까지 빈파일을 생성 합니다. [root@dr01 ~]# cd /data [root@dr01 data]# touch 0 1 2 3 4 5
11.장애 테스트
장애 테스트를 위하여 dr01 시스템을 Down 시킵니다.
dr02 에서 /dev/drbd0 를 /data 에 mount 합니다.
[root@dr01 data]# init 0 [root@dr02 ~]# drbdadm primary dr0 [root@dr02 ~]# mount /dev/drbd0 /data [root@dr02 ~]# ls -al /data/ total 0 drwxr-xr-x 2 root root 60 Sep 9 14:45 . dr-xr-xr-x. 18 root root 236 Sep 9 14:42 .. -rw-r--r-- 1 root root 0 Sep 9 14:45 0 -rw-r--r-- 1 root root 0 Sep 9 14:45 1 -rw-r--r-- 1 root root 0 Sep 9 14:45 2 -rw-r--r-- 1 root root 0 Sep 9 14:45 3 -rw-r--r-- 1 root root 0 Sep 9 14:45 4 -rw-r--r-- 1 root root 0 Sep 9 14:45 5 [root@dr02 ~]#
12. dr0 상태를 확인 합니다.
[root@dr02 ~]# drbdadm status dr0 dr0 role:Primary disk:UpToDate peer connection:Connecting [root@dr02 ~]#
13. 장애 원복
dr02 시스템 에서 primary 를 secondary 로 변경 하고, dr01 시스템을 primary 로 지정 합니다.
[root@dr02 ~]# umount /data [root@dr02 ~]# drbdadm secondary dr0 [root@dr01 ~]# drbdadm primary dr0 [root@dr01 ~]# mount /dev/drbd0 /data [root@dr01 ~]# ls -al /data total 0 drwxr-xr-x 2 root root 60 Sep 9 14:45 . dr-xr-xr-x. 18 root root 236 Sep 9 14:42 .. -rw-r--r-- 1 root root 0 Sep 9 14:45 0 -rw-r--r-- 1 root root 0 Sep 9 14:45 1 -rw-r--r-- 1 root root 0 Sep 9 14:45 2 -rw-r--r-- 1 root root 0 Sep 9 14:45 3 -rw-r--r-- 1 root root 0 Sep 9 14:45 4 -rw-r--r-- 1 root root 0 Sep 9 14:45 5 [root@dr01 ~]#
14. 상태 확인
[root@dr01 ~]# drbdadm status dr0
dr0 role:Primary
disk:UpToDate
peer role:Secondary
replication:Established peer-disk:UpToDate
[root@dr01 ~]#
[root@dr02 /]# drbdadm status dr0
dr0 role:Secondary
disk:UpToDate
peer role:Primary
replication:Established peer-disk:UpToDate
[root@dr02 /]#