Netkiller Linux 手札
Debian/Ubuntu Cookbook
Neo Chan



中国广东省深圳市宝安区龙华镇
518109
+86 755 29812080
+86 755 29812080
<openunix@163.com>
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第 43 章 Distributed Filesystem

目录

DRBD (Distributed Replicated Block Device)

disk and partition
Installation
configure
Starting
Using

Coda

DRBD (Distributed Replicated Block Device)

Homepage: http://www.drbd.org/

实验环境需要两台电脑，如果你没有，建议你使用VMware，并且为每一个虚拟机添加两块硬盘。

实验环境

1.

master: 192.168.0.1 DRBD:/dev/sdb
2.

slave: 192.168.0.2 DRBD:/dev/sdb

disk and partition

Each of the following steps must be completed on both nodes

show all of disk and partition

neo@master:~$ sudo sfdisk -s
/dev/sda: 8388608
/dev/sdb: 2097152
total: 10485760 blocks


create a new partition on the disk /dev/sdb

$ sudo cfdisk /dev/sdb


you must have extended partition

check partition

neo@master:~$ sudo fdisk -l

Disk /dev/sda: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x000301bd

Device Boot Start End Blocks Id System
/dev/sda1 * 1 993 7976241 83 Linux
/dev/sda2 994 1044 409657+ 5 Extended
/dev/sda5 994 1044 409626 82 Linux swap / Solaris

Disk /dev/sdb: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sdb1 1 261 2096451 5 Extended
/dev/sdb5 1 261 2096419+ 83 Linux



format /dev/sdb1

neo@master:~$ sudo mkfs.ext3 /dev/sdb1


you also can using other file system

reiserfs

neo@master:~$ sudo mkfs.reiserfs /dev/sdb1


I suggest you using reiserfs.
Installation

Each of the following steps must be completed on both nodes

search drbd8-utils package

neo@master:~$ apt-cache search drbd
drbd8-utils - RAID 1 over tcp/ip for Linux utilities
drbd0.7-module-source - RAID 1 over tcp/ip for Linux module source
drbd0.7-utils - RAID 1 over tcp/ip for Linux utilities
drbdlinks - Manages symlinks into a shared DRBD partition


installation

neo@master:~$ sudo apt-get install drbd8-utils


to add modules from the Linux Kernel

neo@master:~$ sudo modprobe drbd
neo@master:~$ lsmod |grep drbd
drbd 213000 0
cn 9632 1 drbd



configure

Each of the following steps must be completed on both nodes

backup configure file


neo@master:~$ sudo cp /etc/drbd.conf /etc/drbd.conf.old



edit /etc/drbd.conf

global {
usage-count yes;
}
common {
protocol C;
}
resource r0 {
on master {
device /dev/drbd0;
disk /dev/sdb5;
address 192.168.0.1:7789;
meta-disk internal;
}
on slave {
device /dev/drbd0;
disk /dev/sdb5;
address 10.1.1.32:7789;
meta-disk internal;
}
}


Starting

Each of the following steps must be completed on both nodes.

neo@master:~$ sudo drbdadm create-md r0
neo@master:~$ sudo drbdadm attach r0
neo@master:~$ sudo drbdadm connect r0
neo@master:~$ sudo drbdadm -- --overwrite-data-of-peer primary r0

neo@slave:~$ sudo drbdadm create-md r0
neo@slave:~$ sudo drbdadm attach r0
neo@slave:~$ sudo drbdadm connect r0



master


neo@master:~$ sudo drbdadm create-md r0
v08 Magic number not found
md_offset 2146725888
al_offset 2146693120
bm_offset 2146627584

Found some data
==> This might destroy existing data! <==

Do you want to proceed?
[need to type 'yes' to confirm] yes

v07 Magic number not found
v07 Magic number not found
v08 Magic number not found
Writing meta data...
initialising activity log
NOT initialized bitmap
New drbd meta data block sucessfully created.
success



slave


neo@slave:~# sudo drbdadm create-md r0
v08 Magic number not found
md_offset 2146725888
al_offset 2146693120
bm_offset 2146627584

Found some data
==> This might destroy existing data! <==

Do you want to proceed?
[need to type 'yes' to confirm] yes

v07 Magic number not found
v07 Magic number not found
v08 Magic number not found
Writing meta data...
initialising activity log
NOT initialized bitmap
New drbd meta data block sucessfully created.
success



status

neo@master:~$ cat /proc/drbd
version: 8.0.11 (api:86/proto:86)
GIT-hash: b3fe2bdfd3b9f7c2f923186883eb9e2a0d3a5b1b build by phil@mescal, 2008-02-12 11:56:43
0: cs:StandAlone st:Primary/Unknown ds:UpToDate/DUnknown r---
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0
resync: used:0/31 hits:0 misses:0 starving:0 dirty:0 changed:0
act_log: used:0/127 hits:0 misses:0 starving:0 dirty:0 changed:0
1: cs:Connected st:Secondary/Secondary ds:Diskless/Inconsistent C r---
ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0



Using

master

neo@master:~$ sudo drbdadm primary all
neo@master:~$ sudo mkfs.reiserfs /dev/drbd0
neo@master:~$ sudo mkdir /mnt/drbd0
neo@master:~$ sudo mount /dev/drbd0 /mnt/drbd0/
neo@master:~$ sudo touch /mnt/drbd0/helloworld.tmp
neo@master:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 7.6G 1.3G 6.0G 18% /
varrun 125M 216K 125M 1% /var/run
varlock 125M 8.0K 125M 1% /var/lock
udev 125M 60K 125M 1% /dev
devshm 125M 0 125M 0% /dev/shm
/dev/drbd0 2.0G 33M 2.0G 2% /mnt/drbd0
neo@master:~$ sudo dd if=/dev/zero of=/mnt/drbd0/tempfile1.tmp bs=104857600 count=1
1+0 records in
1+0 records out
104857600 bytes (105 MB) copied, 0.564911 s, 186 MB/s
neo@master:~$ sudo umount /mnt/drbd0/
neo@master:~$ sudo drbdadm secondary all


slave

neo@slave:~$ sudo drbdadm primary all
neo@slave:~$ sudo mkdir /mnt/drbd0
neo@slave:~$ sudo mount /dev/drbd0 /mnt/drbd0/
neo@slave:~$ ls /mnt/drbd0/
helloworld.tmp tempfile1.tmp