1. 关闭iptables，修改selinux,时间同步等
[root@mysql_node1 ~]# /etc/init.d/iptables stop
[root@mysql_node1 ~]# chkconfig iptables off
[root@mysql_node1 ~]# vim /etc/selinux/config
# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
# enforcing - SELinux security policy is enforced.
# permissive - SELinux prints warnings instead of enforcing.
# disabled - No SELinux policy is loaded.
SELINUX=disabled
# SELINUXTYPE= can take one of these two values:
# targeted - Targeted processes are protected,
# mls - Multi Level Security protection.
SELINUXTYPE=targeted
设置每两分钟进行一次时间同步
crontab -e
*/2 * * * * /usr/sbin/ntpdate cn.pool.ntp.org > /tmp/ntp_log.txt
2. 升级内核模块
升级完成后，需要重新启动CentOS
[root@mysql_node1 ~]# yum install kernel* -y
Kernel
3. 添加磁盘，进行磁盘分区
例如添加2GB的磁盘sdb，其中分区sdb1作为drbd的元数据交换区（不需要格式化），分区sdb2作为数据的交换区（需要格式化文件系统）
[root@mysql_node1 ~]# fdisk /dev/sdb
[root@mysql_node1 ~]# fdisk -l
Disk /dev/sdb: 2147 MB, 2147483648 bytes
22 heads, 16 sectors/track, 11915 cylinders
Units = cylinders of 352 * 512 = 180224 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00045fd1
Device Boot Start End Blocks Id System
/dev/sdb1 1 5959 1048776 83 Linux
/dev/sdb2 5960 11915 1048256 83 Linux
4. 安装DRBD
4.1 上传安装drbd的yum源，和drbd内核模块
[root@mysql_node1 ~]# yum install elrepo-release-6-6.el6.elrepo.noarch.rpm
[root@mysql_node1 ~]# yum install drbd kmod-drbd84 -y
4.2 加载drbd内核模块，并且检查是否加载成功
[root@mysql_node1 ~]# modprobe drbd
[root@mysql_node1 ~]# lsmod | grep drbd
drbd 372759 0
libcrc32c 1246 1 drbd
5. 修改drbd的配置文件
5.1 由drbd.conf文件可知可以编辑.res结尾的配置文件到drbd.d文件夹下
[root@mysql_node1 ~]# cat /etc/drbd.conf
# You can find an example in /usr/share/doc/drbd.../drbd.conf.example
include "drbd.d/global_common.conf";
include "drbd.d/*.res";
5.2 可以参考drbd.conf.example文件进行配置
[root@mysql_node1 ~]# cat /etc/drbd.d/mysqldata.res
resource mysqldata {
protocol C;
options {
on-no-data-accessible suspend-io;
}
net {
cram-hmac-alg "sha1";
shared-secret "secret_string";
}
disk {
# If you have a resonable RAID controller
# with non volatile write cache (BBWC, flash)
disk-flushes no;
disk-barrier no;
md-flushes no;
}
on mysql_node1 {
address 192.168.10.98:7780;
device /dev/drbd0;
disk /dev/sdb2;
meta-disk /dev/sdb1;
}
on mysql_node2 {
address 192.168.10.99:7780;
device /dev/drbd0;
disk /dev/sdb2;
meta-disk /dev/sdb1;
}
}
5.3 在主备节点上同时启动drbd服务
[root@mysql_node1 drbd.d]# /etc/init.d/drbd start
5.4 查看drbd节点状态，发现两者都为secondary状态
[root@mysql_node1 ~]# /etc/init.d/drbd status
drbd driver loaded OK; device status:
version: 8.4.7-1 (api:1/proto:86-101)
GIT-hash: 3a6a769340ef93b1ba2792c6461250790795db49 build by mockbuild@Build64R6, 2016-01-12 13:27:11
m:res cs ro ds p mounted fstype
0:mysqldata Connected Secondary/Secondary Diskless/Diskless C
5.5 配置元数据区，设置主节点
[root@mysql_node1 ~]# drbdadm create-md mysqldata
initializing activity log
NOT initializing bitmap
Writing meta data...
New drbd meta data block successfully created.
success
[root@mysql_node1 ~]# drbdadm -- --overwrite-data-of-peer primary all
5.6 观察drbd状态，发现一个为primary，另一个为secondary
[root@mysql_node1 ~]# cat /proc/drbd
version: 8.4.7-1 (api:1/proto:86-101)
GIT-hash: 3a6a769340ef93b1ba2792c6461250790795db49 build by mockbuild@Build64R6, 2016-01-12 13:27:11
0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r-----
ns:1355768 nr:0 dw:307512 dr:1348649 al:83 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:0
5.7 挂载drbd0到/data目录下。之后存放到data下的数据就会自动同步到从服务器
[root@mysql_node1 ~]# mount /dev/drbd0 /data/
5.8 drbd备份的数据无法在从服务器上直接观察到，可以用过关闭从服务器的drbd服务，挂载sdb2到/data目录下查看备份过来的数据