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CentOS7搭建keepalived+DRBD+NFS高可用共享存储

来源：博客园

一、服务器信息

IP地址类型主机名操作系统        内存                磁盘192.168.11.110      主服务器        node01CentOS7.92G系统盘20G 存储盘20G192.168.11.111      备服务器        node02CentOS7.92G系统盘20G 存储盘20G

二、两台主机关闭防火墙，禁用SELinux

[root@node01 ~]# systemctl stop firewalld[root@node01 ~]# systemctl is-active firewalld.service unknown[root@node01 ~]# iptables -F[root@node01 ~]# sed -i "/^SELINUX=/ cSELINUX=disabled" /etc/selinux/config[root@node01 ~]# setenforce 0

三、两台主机设置hosts文件，打通通道


(资料图片仅供参考)

[root@node01 ~]# vim /etc/hosts[root@node01 ~]# tail -2 /etc/hosts192.168.11.110 node01192.168.11.111 node02#配置root用户免密钥互信#主服务器[root@node01 ~]# ssh-keygen -f ~/.ssh/id_rsa -P "" -q[root@node01 ~]# ssh-copy-id node02#备服务器[root@node02 ~]# ssh-keygen -f ~/.ssh/id_rsa -P "" -q[root@node02 ~]# ssh-copy-id node01

四、两台主机配置drbd的yum源，方便软件安装

以下操作两台主机同时完成：

导入源

[root@node01 ~]# rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org[root@node01 ~]# yum localinstall -y https://mirrors.tuna.tsinghua.edu.cn/elrepo/elrepo/el7/x86_64/RPMS/elrepo-release-7.0-6.el7.elrepo.noarch.rpm[root@node01 ~]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

安装DRBD软件包

版本信息

安装90版本

[root@node01 ~]# yum install -y drbd90-utils kmod-drbd90

启动DRBD内核模块

[root@node01 ~]# modprobe drbd[root@node01 ~]# echo drbd > /etc/modules-load.d/drbd.conf[root@node01 ~]# modprobe drbd[root@node01 ~]# lsmod |grep drbddrbd                  611241  0libcrc32c              12644  2 xfs,drbd

五、配置DRBD

[root@node01 ~]# cd /etc/drbd.d/[root@node01 drbd.d]# egrep -v "#|^$" /etc/drbd.d/global_common.conf
[root@node01 drbd.d]# vim global_common.conf global {usage-count no;}common {protocol C;handlers {pri-on-incon-degr "/usr/lib/drbd/notify-pri-on-incon-degr.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";pri-lost-after-sb "/usr/lib/drbd/notify-pri-lost-after-sb.sh; /usr/lib/drbd/notify-emergency-reboot.sh; echo b > /proc/sysrq-trigger ; reboot -f";local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";}startup {}options {}disk {on-io-error detach;}net {}}

配置资源

[root@node01 drbd.d]# vim nfs.resresource nfs {  disk /dev/sdb;  device /dev/drbd0;  meta-disk internal;  on node01 {        address 192.168.11.110:7789;  }  on node02 {        address 192.168.11.111:7789;  }}[root@node01 drbd.d]# scp nfs.res node02:$PWDnfs.res                                                                                                              100%  176   255.6KB/s   00:00    [root@node01 drbd.d]# ssh node02  ls /etc/drbd.d/global_common.confnfs.res

六、启用DRBD

1、首次启用资源

有补全功能，需要重新登录会话

1> 创建设备元数据

[root@node01 drbd.d]# drbdadm create-md nfsinitializing activity loginitializing bitmap (640 KB) to all zeroWriting meta data...New drbd meta data block successfully created.[root@node01 drbd.d]# ssh node02 drbdadm create-md nfsinitializing bitmap (640 KB) to all zeroinitializing activity logWriting meta data...New drbd meta data block successfully created.[root@node01 drbd.d]#

2> 启用资源

[root@node01 drbd.d]# drbdadm up nfs[root@node01 drbd.d]# ssh node02 drbdadm up nfs

3> 初始设备同步

只在主端执行

[root@node01 drbd.d]# drbdadm primary --force nfs[root@node01 drbd.d]# drbdadm status nfsnfs role:Primary  disk:UpToDate  node02 role:Secondary    replication:SyncSource peer-disk:Inconsistent done:6.68

初始完成后

2、常用命令

drbdadm cstate nfs       连接状态drbdadm dstate nfs 磁盘状态drbdadm role nfs 资源角色drbdadm primary nfs 提升资源drbdadm secondary nfs    降级资源

七、验证DRBD

两台节点都创建挂载点：mkdir /data主节点上操作：

[root@node01 drbd.d]# mkdir /data[root@node01 drbd.d]# mkfs.xfs  /dev/drbd0 meta-data=/dev/drbd0             isize=512    agcount=4, agsize=1310678 blks         =                       sectsz=512   attr=2, projid32bit=1         =                       crc=1        finobt=0, sparse=0data     =                       bsize=4096   blocks=5242711, imaxpct=25         =                       sunit=0      swidth=0 blksnaming   =version 2              bsize=4096   ascii-ci=0 ftype=1log      =internal log           bsize=4096   blocks=2560, version=2         =                       sectsz=512   sunit=0 blks, lazy-count=1realtime =none                   extsz=4096   blocks=0, rtextents=0[root@node01 drbd.d]# mount /dev/drbd0  /data/

创建测试文件

[root@node01 drbd.d]# touch /data/file{1..2}

卸载文件系统并切换为备节点

[root@node01 drbd.d]# umount /data [root@node01 drbd.d]# drbdadm secondary nfs

在从上执行以下命令确认文件

[root@node02 ~]# drbdadm primary nfs [root@node02 ~]# mkdir /data[root@node02 ~]# mount /dev/drbd0  /data[root@node02 ~]# ll /data/total 0-rw-r--r-- 1 root root 0 May 14 18:01 file1-rw-r--r-- 1 root root 0 May 14 18:01 file2

启用服务

[root@node01 ~]# systemctl enable --now drbdCreated symlink from /etc/systemd/system/multi-user.target.wants/drbd.service to /usr/lib/systemd/system/drbd.service.[root@node02 ~]# systemctl enable --now drbdCreated symlink from /etc/systemd/system/multi-user.target.wants/drbd.service to /usr/lib/systemd/system/drbd.service.

至此，DRBD安装完成

八、keepalived+drbd+nfs构建高可用存储

1、安装NFS软件

[root@node01 ~]# yum install rpcbind.x86_64  nfs-utils.x86_64  -y

2、配置

[root@node01 ~]# vim /etc/exports[root@node01 ~]# cat /etc/exports/data 192.168.11.0/24(rw,sync,no_root_squash)

3、重启服务，设置为开机自启动

[root@node01 ~]# systemctl enable --now  nfs rpc-rquotad.service

4、安装配置keepalived

自带keepalived版本

[root@node01 ~]# yum list all | grep keepalivedkeepalived.x86_64                        1.3.5-19.el7                  base

安装keepalived ，两台机器都安装

[root@node01 ~]# yum install -y keepalived.x86_64

5、修改配置文件

[root@node01 drbd.d]# vim /usr/lib/systemd/system/keepalived.service [Unit]Description=LVS and VRRP High Availability MonitorAfter=syslog.target network-online.target[Service]Type=forkingPIDFile=/var/run/keepalived.pid#KillMode=processEnvironmentFile=-/etc/sysconfig/keepalivedExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONSExecReload=/bin/kill -HUP $MAINPID[Install]WantedBy=multi-user.target

6、两台机器都创建logs目录：mkdir /etc/keepalived/logs

7、主节点配置：

[root@node01 ~]# cat /etc/keepalived/keepalived.conf! Configuration File for keepalivedglobal_defs {   notification_email {     acassen@firewall.loc     failover@firewall.loc     sysadmin@firewall.loc   }   notification_email_from Alexandre.Cassen@firewall.loc   smtp_server 192.168.200.1   smtp_connect_timeout 30   router_id DRBD_HA_MASTER}vrrp_script chk_nfs {        script "/etc/keepalived/chk_nfs.sh"        interval 2        weight 40}vrrp_instance VI_1 {    state MASTER    interface ens32    virtual_router_id 51    priority 100    advert_int 1    authentication {        auth_type PASS        auth_pass 1111    }    track_script {        chk_nfs    }    notify_stop /etc/keepalived/notify_stop.sh           notify_master /etc/keepalived/notify_master.sh       notify_backup /etc/keepalived/notify_backup.sh    virtual_ipaddress {        192.168.11.11/24 dev ens32 label ens32:1    }

8、配置文件中的几个shell脚本

[root@node01 keepalived]# vim chk_nfs.sh#!/bin/bashsystemctl status nfsif [ $? -ne 0 ]then        systemctl start nfs        if [ $? -ne 0  ]        then                umount /dev/drbd0                drbdadm secondary nfs                systemctl stop keepalived        fifi

脚本增加执行权限：chomod +x *.sh将配置文件和脚本拷贝到备节点：

[root@node01 keepalived]# scp *.sh keepalived.conf   node02:$PWD

9、备节点修改配置文件:

[root@node02 keepalived]# vim keepalived.conf

10、测试：

启动keepalived进行测试

验证（正常）：1、查看VIP

2、查看资源角色

3、查看挂载

4、查看nfs

关键词：