2019独角兽企业重金招聘Python工程师标准>>> 
http://docs.linbit.com/docs/users-guide-9.0/#ch-pacemaker
安装说明：
- RHEL 7.4 (crhel71,crhel72)
- drbd 9.0.9-1
- 2台相同配置服务器，硬盘数量、大小相同
- 设定两节点间 ssh 免密登录
- 使用/etc/hosts 或者DNS，让两个节点能互相解析
- 设定 YUM repo, 指向到清华大学开源镜像服务器( https://mirrors.tuna.tsinghua.edu.cn/elrepo/elrepo/el7/x86_64 )
- 上述条件满足后，一条命令就完成安装
# yum -y install drbd90-utils kmod-drbd90
下面主要讲解具体设定：
1. /etc/drbd.conf文件无需该动
2. /etc/drbd.d/global_common.conf，在common配置部分的net选项中添加protocol C;，表示使用协议C的方式进行数据复制
# sed -i "55a\ protocol C;" /etc/drbd.d/global_common.conf
# cat /etc/drbd.d/global_common.conf
...
common {
net {protocol C;}
}
3.该文件用于定义drbd镜像资源
# cat <
resource r0 {
protocol C;
disk /dev/sdb;
device /dev/drbd0;
meta-disk internal;
syncer {
verify-alg sha1;
}
net {
allow-two-primaries;
}
on crhel71 {
address 10.247.15.78:7789;
}
on crhel72 {
address 10.247.15.76:7789;
}
disk {
resync-rate 100M;
c-min-rate 10;
c-max-rate 400M;
}
}
EOF
4. 对节点的drbd操作, 在两个节点上都执行：
Now that we have the configuration in place, it’s time to initialize our data:
At this point, we’re ready to start DRBD on both nodes and bring the r0 resource up. After bringing the resource up, let’s check the status:
[root@crhel71 ~]# drbdadm up r0
initializing activity log
initializing bitmap (672 KB) to all zero
Writing meta data...
New drbd meta data block successfully created.
[root@crhel71 ~]# drbdadm status
r0 role:Secondary
disk:Inconsistent
crhel72 role:Secondary
peer-disk:Inconsistent
[root@crhel72 ~]# drbdadm up r0
[root@crhel72 ~]# drbdadm status
r0 role:Secondary
disk:Inconsistent
crhel71 role:Secondary
peer-disk:Inconsistent
5. 选定primary node, 并同步数据
>>在所有节点中， 选定1台作为primary node，执行下面命令，数据同步开始进行；让子弹飞一会，进度使用下面命令查询
[root@crhel71 ~]# drbdadm primary --force r0
[root@crhel71 ~]# drbdadm status
r0 role:Primary
disk:UpToDate
crhel72 role:Secondary
replication:SyncSource peer-disk:Inconsistent done:15.21
[root@crhel72 ~]# drbdadm status
r0 role:Secondary
disk:Inconsistent
crhel71 role:Primary
replication:SyncTarget peer-disk:UpToDate done:20.35
>>几分钟后，在各节点上查询状态，看到已经同步完成：
[root@crhel71 ~]# drbdadm status
r0 role:Primary
disk:UpToDate
crhel72 role:Secondary
peer-disk:UpToDate
[root@crhel72 ~]# drbdadm status
r0 role:Secondary
disk:UpToDate
crhel71 role:Primary
peer-disk:UpToDate
6. 建立文件系统(do this on primary node)
[root@crhel71 ~]# mkfs.xfs /dev/drbd0
7. 测试drbd镜像
[root@crhel71 ~]# mount /dev/drbd0 /mnt/
[root@crhel71 ~]# touch /mnt/file{1..5}
[root@crhel71 ~]# drbd-overview
...
0:r0/0 Connected(2*) Primar/Second UpToDa/UpToDa /mnt xfs 21G 33M 21G 1%
[root@crhel71 ~]# umount /mnt
[root@crhel71 ~]# drbdadm secondary r0
[root@crhel72 ~]# drbdadm primary r0
[root@crhel72 ~]# mount /dev/drbd0 /mnt/
[root@crhel72 mnt]# ls
file1 file2 file3 file4 file5