Heartbeat+DRBD+NFS高可用
一、环境系统: CentOS 6.4x64 最小化安装
node1: 192.168.1.13
node2: 192.168.1.14
vip: 192.168.1.15
nfs: 192.168.1.10
二、基础配置
node1和node2的操作一样
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#关闭iptables和selinux
# getenforce
Disabled #确保这项是正确的
# service iptables stop
#配置本地hosts解析
# echo "192.168.1.13node1" >>/etc/hosts
# echo "192.168.1.14node2" >>/etc/hosts
# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.13node1
192.168.1.14node2
#配置epel源
# rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# sed -i 's@#b@b@g' /etc/yum.repos.d/epel.repo
# sed-i 's@mirrorlist@#mirrorlist@g' /etc/yum.repos.d/epel.repo
#同步时间
# yum install ntp -y
# echo "*/10 * * * * /usr/sbin/ntpdate asia.pool.ntp.org&>/dev/null" >/var/spool/cron/root
# ntpdate asia.pool.ntp.org
21 Jun 17:32:45 ntpdate: step time server 211.233.40.78 offset -158.552839 sec
# hwclock -w
#配置ssh互信
# ssh-keygen
# ssh-copy-id -i ~/.ssh/id_rsa.pub root@node2
三、安装配置heartbeat
(1).安装heartbeat
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#在ha-node1和ha-node2都执行安装操作
# yum install heartbeat -y
(2).配置ha.cf
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# cd /usr/share/doc/heartbeat-3.0.4/
# cp authkeys ha.cf haresources /etc/ha.d/
# cd /etc/ha.d/
# ls
authkeysha.cfharcharesourcesrc.dREADME.configresource.dshellfuncs
# egrep -v "^$|^#" /etc/ha.d/ha.cf
logfile /var/log/ha-log
logfacility local1
keepalive 2
deadtime 30
warntime 10
initdead 120
mcast eth0 225.0.10.1 694 1 0
auto_failback on
node node1
node node2
crm no
(3).配置authkeys
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# dd if=/dev/random bs=512 count=1 | openssl md5
0+1 records in
0+1 records out
21 bytes (21 B) copied, 3.1278e-05 s, 671 kB/s
(stdin)= 4206bd8388c16292bc03710a0c747f59
# grep -v ^# /etc/ha.d/authkeys
auth 1
1 md5 4206bd8388c16292bc03710a0c747f59
#将认证文件权限修改成600
# chmod 600 /etc/ha.d/authkeys
(4).配置haresource
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# grep -v ^# /etc/ha.d/haresources
node1 IPaddr::192.168.1.15/24/eth0
(5).启动heartbeat
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# scp authkeys haresourcesha.cf node2:/etc/ha.d/
#node1启动服务
# /etc/init.d/heartbeat start
Starting High-Availability services: INFO:Resource is stopped
Done.
# chkconfig heartbeat off
#说明：关闭开机自启动，当服务器重启时，需要人工去启动
#node2启动服务
# /etc/init.d/heartbeat start
#查看结果
# ip a |grep eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 192.168.1.13/24 brd 192.168.1.255 scope global eth0
inet 192.168.1.15/24 brd 192.168.1.255 scope global secondary eth0 #vip在主节点上
# ip a |grep eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 192.168.1.14/24 brd 192.168.1.255 scope global eth0 #备节点上没有vip
(6).测试heartbeat
正常状态
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#node1信息
# ip a |grep eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 192.168.1.13/24 brd 192.168.1.255 scope global eth0
inet 192.168.1.15/24 brd 192.168.1.255 scope global secondary eth0 #vip在主节点上
#node2信息
# ip a |grep eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 192.168.1.14/24 brd 192.168.1.255 scope global eth0 #备节点上没有vip
模拟主节点宕机后的状态信息
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#在主节点node1停止heartbeat服务
# /etc/init.d/heartbeat stop
Stopping High-Availability services: Done.
# ip a |grep eth0 #主节点的heartbeat服务停止后，vip资源被抢走
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 192.168.1.13/24 brd 192.168.1.255 scope global eth0
#在备节点node2查看资源
# ip a |grep eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 192.168.1.14/24 brd 192.168.1.255 scope global eth0
inet 192.168.1.15/24 brd 192.168.1.255 scope global secondary eth0
恢复主节点的heartbeat服务
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# /etc/init.d/heartbeat start
Starting High-Availability services: INFO:Resource is stopped
Done.
#主节点的heartbeat服务恢复后，将资源接管回来了
# ip a |grep eth0
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 192.168.1.13/24 brd 192.168.1.255 scope global eth0
inet 192.168.1.15/24 brd 192.168.1.255 scope global secondary eth0
#查看备节点
# ip a |grep eth0 #vip资源已移除
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
inet 192.168.1.14/24 brd 192.168.1.255 scope global eth0
四、安装部署DRBD
(1).对硬盘进行分区，node1和node2的操作一样
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# fdisk /dev/sdb
#说明：/dev/sdb分成2个分区/dev/sdb1和/dev/sdb2，/dev/sdb1=19G
# partprobe /dev/sdb
#对分区进行格式化
# mkfs.ext4 /dev/sdb1
说明：sdb2分区为meta data分区，不需要格式化操作
# tune2fs -c -1 /dev/sdb1
说明：设置最大挂载数为-1,关闭强制检查挂载次数限制
(2).安装DRBD由于我们的系统是CentOS6.4的，所以我们还需要安装内核模块，版本需要和uname -r保持一致，安装包我们从系统安装软件中提取出来，过程略。node1和node2的安装过程一样，这里只给出node1的安装过程
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#安装内核文件
# rpm -ivh kernel-devel-2.6.32-358.el6.x86_64.rpm kernel-headers-2.6.32-358.el6.x86_64.rpm
# yum install drbd84 kmod-drbd84 -y
(3).配置DRBD
a.修改全局配置文件
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# egrep -v "^$|^#|^[[:space:]]+#" /etc/drbd.d/global_common.conf
global {
usage-count no;
}
common {
protocol C;
handlers {
}
startup {
}
options {
}
disk {
on-io-error detach;
no-disk-flushes;
no-md-flushes;
rate 200M;
}
net {
sndbuf-size 512k;
max-buffers 8000;
unplug-watermark 1024;
max-epoch-size8000;
cram-hmac-alg "sha1";
shared-secret "weyee2014";
after-sb-0pri disconnect;
after-sb-1pri disconnect;
after-sb-2pri disconnect;
rr-conflict disconnect;
}
}
b.增加资源
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# cat /etc/drbd.d/nfsdata.res
resource nfsdata {
on node1 {
device /dev/drbd1;
disk /dev/sdb1;
address 192.168.1.13:7789;
meta-disk /dev/sdb2 ;
}
on node2 {
device /dev/drbd1;
disk/dev/sdb1;
address 192.168.1.14:7789;
meta-disk /dev/sdb2 ;
}
}
c.将配置文件复制到node2上，重启系统加载drbd模块，初始化meta数据
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# scp global_common.conf nfsdata.res node2:/etc/drbd.d/
# depmod
# modprobe drbd
# lsmod |grep drbd
drbd 3659310
libcrc32c 12461 drbd
#在node1初始化meta数据
# drbdadm create-md nfsdata
initializing activity log
NOT initializing bitmap
Writing meta data...
New drbd meta data block successfully created.
#在node2上加载模块，初始化meta数据
# depmod
# modprobe drbd
# lsmod |grep drbd
drbd 3659310
libcrc32c 12461 drbd
# drbdadm create-md nfsdata
initializing activity log
NOT initializing bitmap
Writing meta data...
New drbd meta data block successfully created.
d.在node1和node2上启动drbd
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#node1操作
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