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DRBD的全称为：Distributed Replicated Block Device (DRBD) 分布式块设备复制
与心跳连接结合使用，构建高可用性(HA)的集群。
实现方式是通过网络来镜像(mirror)整个设备。它允许用户在远程机器上建立一个本地块设备的实时镜像。DRBD负责接收数据，把数据写到本地磁盘，然后发送给另一个主机。另一个主机再将数据存到自己的磁盘中。
参考文档
DRBD - LINBIT
环境
VMwareWorkstation 16Pro
centos8-stream
centos8-DRBD1 192.168.8.157/24
centos8-DRBD2 192.168.8.158/24
——8G内存，4core
——nat网络
——系统盘100G
——20G SCSI磁盘 - 用以被DRBD接管
——最小化安装
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rm -rf /etc/yum.repos.d/*
cat > /etc/yum.repos.d/iso.repo <<END
[AppStream]
name=AppStream
baseurl=http://mirrors.163.com/centos/8-stream/AppStream/x86_64/os/
enabled=1
gpgcheck=0
[BaseOS]
name=BaseOS
baseurl=http://mirrors.163.com/centos/8-stream/BaseOS/x86_64/os/
enabled=1
gpgcheck=0
[epel]
name=epel
baseurl=https://mirrors.tuna.tsinghua.edu.cn/epel/8/Everything/x86_64/
gpgcheck=0
END
yum clean all
yum makecache
hostnamectl set-hostname DRBD01 && bash
hostnamectl set-hostname DRBD02 && bash
sed -i 's/SELINUX=enforcing/SELINUX=permissive/' /etc/selinux/config
setenforce 0
systemctl disable firewalld --now
echo "
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.8.157 DRBD01
192.168.8.158 DRBD02
" > /etc/hosts
yum -y group install "Development Tools" && yum -y install wget vim net-tools lvm2
yum -y install drbd
wget https://pkg.linbit.com//downloads/drbd/9/drbd-9.1.11.tar.gz
tar zxvf drbd-9.1.11.tar.gz
cd drbd-9.1.11
make && make install
modprobe drbd
lsmod | grep -i drbd
echo drbd > /etc/modules-load.d/drbd.conf
drbd配置文件/etc/drbd.d/global_common.conf
drbd主配置文件/etc/drbd.conf
pvcreate /dev/sdb
vgcreate drbd /dev/sdb
lvcreate -n drbd -l 100%free drbd
echo "
#指定资源名为ws-drbd
resource ws-drbd {
#指定元数据
meta-disk internal;
#指定逻辑磁盘
device /dev/drbd1;
net {
verify-alg sha256;
}
#指定节点，与对应的逻辑卷
on DRBD01 {
address 192.168.8.157:7788;
disk /dev/drbd/drbd;
}
on DRBD02 {
address 192.168.8.158:7788;
disk /dev/drbd/drbd;
}
} " > /etc/drbd.d/ws-drdb.res
drbdadm create-md ws-drbd
drbdadm up ws-drbd
drbdadm status
drbdadm primary ws-drbd --force
drbdadm status
lsblk
drbdadm status
mkfs.ext4 /dev/drbd1
mount /dev/drbd1 /mnt/
echo 1 > /mnt/test
poweroff
mount /dev/drbd1 /mnt/
ls /mnt/
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