heartbeat+DRBD 高可用 双机热备
原创博文http://www.cnblogs.com/elvi/p/7658109.html
## heartbeat+DRBD 高可用 双机热备 # 环境centos6 # 测试演练 # 虚拟机添加10G硬盘 # 添加网卡,作为数据传输 #主机 VIP 192.168.18.80 web1 192.168.18.11 192.168.99.11(心跳线) 192.168.100.11(数据传输) web2 192.168.18.12 192.168.99.12 192.168.100.12 vim /etc/sysconfig/network-scripts/ifcfg-eth2 DEVICE="eth2" BOOTPROTO="static" IPADDR=192.168.100.12 NETMASK=255.255.255.0 ONBOOT="yes" # ifup eth2 uname -r #关闭防火墙 #分区 #fdisk快速分区 #echo -e "n\np\n1\n+10G\nn\np\n2\n\n+20G\nw" | fdisk /dev/sdb fdisk -l fdisk /dev/sdb p n 1 +8G 2 w #备节点、状态分区 不需要格式化 mkfs.ext4 /dev/sdb1 e2label /dev/sdb1 /data #给分区标签 # #安装 DRBD rpm -Uvh http://www.elrepo.org/elrepo-release-6-6.el6.elrepo.noarch.rpm yum install drbd kmod-drbd84 -y #内核加载 lsmod |grep drbd modprobe drbd #加载DRBD模块到内核 modprobe -l | grep -i drbd echo "modprobe drbd" >>/etc/rc.local ##开机自动加载 #yum install kernel-devel -y #模板 ll /etc/drbd.d/ #配置 vim /etc/drbd.conf global { usage-count no; } common { syncer { rate 200M; verify-alg crc32c; } } resource webdata { protocol C; disk { on-io-error detach; } on web1 { device /dev/drbd0; disk /dev/sdb1; address 192.168.100.11:7788; meta-disk /dev/sdb2[0]; } on web2 { device /dev/drbd0; disk /dev/sdb1; address 192.168.100.12:7788; meta-disk /dev/sdb2[0]; } } #drbd初始化与启动 drbdadm create-md webdata drbdadm up webdata /etc/init.d/drbd start #将第一个节点置为primary drbdadm -- --overwrite-data-of-peer primary webdata #drbdsetup /dev/drbd0 primary -o #查看同步完成状态 cat /proc/drbd #磁盘挂载(仅primary节点),Secondary挂载需要先drbdadm down data -->mount /dev/sdb1 /data mkdir /data mount /dev/drbd0 /data df -l #验证同步 #主节点创建文件 echo $(date +%Y-%m-%d-%H%M%S)>>/data/test.txt cat /data/test.txt #备节点停用服务,挂载分区查看 drbdadm down webdata mount /dev/sdb1 /data ll /data cat /data/test.txt #备节点启用 umount /dev/sdb1 drbdadm up webdata cat /proc/drbd #DRBD主备节点切换 #主:卸载分区,设置为备节点 umount /dev/drbd0 drbdadm secondary webdata #(all) #备:设置为主节点,挂载分区 drbdadm primary webdata #(all) mount /dev/drbd0 /data # DRBD脑裂后的处理 #从节点上切换成secondary,并放弃该资源的数据: drbdadm secondary alldrbdadm -- --discard-my-data connect all drbdadm -- --overwrite-data-of-peer primary data #设置主节点同步数据到备节点 #重新连接资源 drbdadm down webdata drbdadm connect webdata drbdadm up webdata drbdadm primary all #主 drbdadm secondary all #备 #+ heartbeat高可用 vim /etc/ha.d/haresources #web1 IPaddr::192.168.18.80/24/eth0 nginx web1 IPaddr::192.168.18.80/24/eth0 nginx drbddisk::webdata Filesystem::/dev/drbd0::/data::ext4 #主节点 ,解除磁盘挂载,重启heartbeat服务 umount /dev/drbd0 service heartbeat stop service heartbeat start #备节点启动heartbeat service heartbeat start #查看服务 ip add | grep eth0 mount|grep data cat /proc/drbd #主备切换验证 service heartbeat stop #主,停止服务 #查看备节点服务 ip add | grep eth0 mount|grep data cat /proc/drbd service heartbeat restart #主,启动服务 #备节点实际容量变小调整 /etc/init.d/drbd stop e2fsck -f /dev/sdb1 resize2fs /dev/sdb1 #增加主机测试(主备/usr/share/nginx/html主页文件不同) ln -s /usr/share/nginx/html /data/html vim /etc/nginx/conf.d/test.conf server { listen 80; server_name test.com; location / { root /data/html; index index.html index.htm index.php; } } #重启服务 service heartbeat stop service heartbeat start #本机访问,修改本机hosts文件C:\Windows\System32\drivers\etc 192.168.18.80 test.com #浏览器访问域名 test.com ##NFS #服务端配置 mkdir /data/share #vim /etc/exports echo "/data/share 192.168.18.0/24(rw,no_root_squash)">>/etc/exports /etc/init.d/rpcbind restart /etc/init.d/nfs restart #客户端 showmount -e 192.168.18.80 #查看共享 service rpcbind start mkdir -p /data/share umount /data/share mount -t nfs 192.168.18.80:/data/share /data/share #查看测试 mount|grep /data/share echo $(date +%Y-%m-%d-%H%M%S)>>/data/share/nfs.txt cat /data/share/nfs.txt ##开机挂载 echo "192.168.18.80:/data/share /data/share nfs defaults 0 0">>/etc/fstab #heartbeat+drbd+nfs配置 vim /etc/ha.d/haresources web1 IPaddr::192.168.18.80/24/eth0 nginx drbddisk::webdata Filesystem::/dev/drbd0::/data::ext4 nfs showmount -e localhost #主备切换验证 …… mount|grep /data/share echo $(date +%Y-%m-%d-%H%M%S)>>/data/share/nfs.txt cat /data/share/nfs.txt showmount -e localhost mount|grep data ip add | grep eth0 cat /proc/drbd service heartbeat stop service heartbeat start service heartbeat restart # 参考
#http://blog.csdn.net/lt53130640688/article/details/50152615 #http://www.cnblogs.com/wsl222000/p/5777382.html