一、Heartbeat概念
Heartbeat是Linux-HA项目中的一个组件，也是目前开源HA项目中最成功的一个例子, Linux-HA的全称是High-Availability Linux,这个开源项目的目标是：通过社区开发者的共同努力，提供一个增强linux可靠性（reliability)、可用性（availability）和可服务性（serviceability）（RAS）的群集解决方案.Heartbeat提供了所有 HA 软件所需要的基本功能，比如心跳检测和资源接管、监测群集中的系统服务、在群集中的节点间转移共享 IP 地址的所有者等.
Heartbeat官方站点：
* http://www.linux-ha.org
* http://hg.linux-ha.org
二、准备工作
1、Heartbeat网络架构
2、 *** 作系统
CentOS 6.4 X86-64 最小化安装 由于用源码编译安装heartbeat一直没有通过，所以没办法只能采用yum安装。 heartbeat v3
3、地址规划
node1 192.168.0.101 255.255.255.0 192.168.0.1 node1.test.com eth1 Active node2 192.168.0.102 255.255.255.0 192.168.0.1 node2.test.com eth1 Passive node3 192.168.0.103 255.255.255.0 192.168.0.1 node3.test.com eth1 nfs vip 192.168.0.200 255.255.255.0
4、主机名解析
[root@node1 ~]# uname -n node1.test.com [root@node1 ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.0.101 node1.test.com node1 192.168.0.102 node2.test.com node2
[root@node2 ~]# uname -n node2.test.com [root@node2 ~]# cat /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.0.101 node1.test.com node1 192.168.0.102 node2.test.com node2
5、双机互信
[root@node1 ~]# ssh-keygen -t rsa -f ~/.ssh/id_rsa -P '' Generating public/private rsa key pair. Created directory '/root/.ssh'. Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: ce:f3:d7:63:10:9b:d2:86:f8:8a:5a:ee:41:d8:d2:01 root@node1.test.com The key's randomart p_w_picpath is: +--[ RSA 2048]----+ | E | | . | | . | | + . . | | o + S. o + | | o o. o * | | o +. o o | | o o o. . + | | .o+ .... . . | +-----------------+ [root@node1 ~]# ssh-copy-id -i .ssh/id_rsa.pub root@node2.test.com The authenticity of host 'node2.test.com (192.168.0.102)' can't be established. RSA key fingerprint is 46:b9:7c:11:db:75:93:ad:f1:26:f0:a7:4d:00:40:20. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'node2.test.com,192.168.0.102' (RSA) to the list of known hosts. root@node2.test.com's password: Now try logging into the machine, with "ssh 'root@node2.test.com'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting.
[root@node2 ~]# ssh-keygen -t rsa -f ~/.ssh/id_rsa -P '' Generating public/private rsa key pair. Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: c4:e3:71:f8:82:09:f0:42:9c:e7:20:db:db:ce:dc:0b root@node2.test.com The key's randomart p_w_picpath is: +--[ RSA 2048]----+ | .o. | |..+o. . . | | +.+o * . | |. .... = = | | o o S . | | . . . | | +E. | | +.. | | .. | +-----------------+ [root@node2 ~]# ssh-copy-id -i .ssh/id_rsa.pub root@node1.test.com The authenticity of host 'node1.test.com (192.168.0.101)' can't be established. RSA key fingerprint is 46:b9:7c:11:db:75:93:ad:f1:26:f0:a7:4d:00:40:20. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'node1.test.com,192.168.0.101' (RSA) to the list of known hosts. root@node1.test.com's password: Now try logging into the machine, with "ssh 'root@node1.test.com'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting.
6、时间同步
# yum -y install ntpdate # ntpdate asia.pool.ntp.org
7、关闭防火墙
# getenforce Disabled # /etc/init.d/iptables status iptables：未运行防火墙。
三、安装heartbeat包
1、node1和node2节点安装epel源
# wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm # wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm # rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm
2、修改epel源的配置文件
# sed -i 's/#baseurl/baseurl/g' /etc/yum.repos.d/epel.repo # sed -i 's/mirrorlist/#mirrorlist/' /etc/yum.repos.d/epel.repo
3、安装heartbeat包
# yum install heartbeat heartbeat-libs
4、查看heartbeat所依赖的包
四、配置Heartbeat服务
1、heartbeat配置文件的介绍
heartbeat3个配置文件 authkeys #节点之间认证的秘钥key文件，权限为600 ha.cf #heartbeat服务核心配置文件 haresources #集群资源管理器(haresource | crm)
2、拷贝heartbeat初始配置文件
[root@node1 ~]# cp /usr/share/doc/heartbeat-3.0.4/{ha.cf,authkeys,haresources} /etc/ha.d/
3、编辑authkeys文件
[root@node1 ~]# dd if=/dev/random bs=512 count=1 | openssl md5 #生成密钥随机数 记录了0+1 的读入 记录了0+1 的写出 72字节(72 B)已复制，4.8467e-05 秒，1.5 MB/秒 (stdin)= acf7401e6b20d4cec482ba1160eb8efe [root@node1 ~]# vim /etc/ha.d/authkeys #注释：末尾添加以下两行 auth 1 1 md5 acf7401e6b20d4cec482ba1160eb8efe [root@node1 ~]# chmod 600 /etc/ha.d/authkeys
4、编辑ha.cf主配置文件
[root@node1 ha.d]# grep -v '^#' ha.cf |sed '/^$/d' 注释：主要修改两处，其它的都可以默认 logfacility local0 mcast eth1 225.100.100.100 694 1 0 #修改心跳信息的传播方式|组播 auto_failback on node node1.test.com #配置集群中的节点数 node node2.test.com #配置集群中的节点数
5、编辑haresources配置文件
[root@node1 ha.d]# grep -v '^#' /etc/ha.d/haresources node1.test.com IPaddr::192.168.0.200/24/eth1 httpd
6、拷贝配置文件到node2节点
[root@node1 ~]# scp /etc/ha.d/{ha.cf,haresources,authkeys} root@node2.test.com:/etc/ha.d/
五、节点提供httpd服务
1、安装httpd包
[root@node1 ~]# yum -y install httpd
2、提供测试页面
[root@node1 ~]# echo "<h1>node1.test.com</h1>" > /var/www/html/index.html
3、启动httpd服务
[root@node1 ~]# service httpd start
4、浏览器访问web页面
注释：测试完成后关闭服务，并让其开机不启动，httpd由heartbeat(haresource)管理
5、停止httpd服务，设置开机不启动httpd服务
[root@node1 ~]# service httpd stop 停止 httpd： [确定] [root@node1 ~]# chkconfig httpd off [root@node1 ~]# chkconfig --list httpd httpd 0:关闭 1:关闭 2:关闭 3:关闭 4:关闭 5:关闭 6:关闭
6、节点2同上 *** 作
[root@node2 ~]# yum -y install httpd [root@node2 ~]# echo "<h1>node2.test.com</h1>" > /var/www/html/index.html [root@node2 ~]# service httpd start [root@node2 ~]# service httpd stop [root@node2 ~]# chkconfig httpd off
7、访问节点2的httpd服务测试页面
六、启动heartbeat服务
1、启动heartbeat服务
[root@node1 ~]# /etc/init.d/heartbeat start Starting High-Availability services: INFO: Resource is stopped Done. [root@node1 ~]# ssh node2 "/etc/init.d/heartbeat start" Starting High-Availability services: 2014/12/25_21:09:12 INFO: Resource is stopped Done.
2、查看heartbeat日志
[root@node1 ~]# tail -f /var/log/message
3、查看vip信息
[root@node1 ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:c7:14:97 brd ff:ff:ff:ff:ff:ff inet 192.168.0.101/24 brd 192.168.0.255 scope global eth1 inet 192.168.0.200/24 scope global eth1 #vip已经成功绑定在eth1的网卡上 inet6 fe80::20c:29ff:fec7:1497/64 scope link valid_lft forever preferred_lft forever
4、查看httpd服务是否被heartbeat接管
[root@node1 ~]# netstat -tnlpu |grep httpd tcp 0 0 :::80 :::* LISTEN 2140/httpd
5、浏览器访问测试
6、将node1节点由Active切换成Passive
[root@node1 ~]# sh /usr/share/heartbeat/hb_standby Going standby [all].
7、查看node1节点的日志信息
[root@node1 ~]# tail -f /var/log/messages Dec 25 21:36:11 node1 heartbeat: [1255]: info: node1.test.com wants to go standby [all] Dec 25 21:36:11 node1 heartbeat: [1255]: info: standby: node2.test.com can take our all resources Dec 25 21:36:11 node1 heartbeat: [1701]: info: give up all HA resources (standby). Dec 25 21:36:11 node1 ResourceManager(default)[1714]: info: Releasing resource group: node1.test.com IPaddr::192.168.0.200/24/eth1 httpd Dec 25 21:36:11 node1 ResourceManager(default)[1714]: info: Running /etc/init.d/httpd stop Dec 25 21:36:11 node1 ResourceManager(default)[1714]: info: Running /etc/ha.d/resource.d/IPaddr 192.168.0.200/24/eth1 stop Dec 25 21:36:11 node1 IPaddr(IPaddr_192.168.0.200)[1789]: INFO: IP status = ok, IP_CIP= Dec 25 21:36:11 node1 /usr/lib/ocf/resource.d//heartbeat/IPaddr(IPaddr_192.168.0.200)[1763]: INFO: Success Dec 25 21:36:11 node1 heartbeat: [1701]: info: all HA resource release completed (standby). Dec 25 21:36:11 node1 heartbeat: [1255]: info: Local standby process completed [all]. Dec 25 21:36:12 node1 heartbeat: [1255]: WARN: 1 lost packet(s) for [node2.test.com] [425:427] Dec 25 21:36:12 node1 heartbeat: [1255]: info: remote resource transition completed. Dec 25 21:36:12 node1 heartbeat: [1255]: info: No pkts missing from node2.test.com! Dec 25 21:36:12 node1 heartbeat: [1255]: info: Other node completed standby takeover of all resources.
8、注释说明
node1节点由Active切换到Passive后，httpd服务停止，vip有node1转移到node2上
9、查看node2节点
[root@node2 ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:ad:9f:36 brd ff:ff:ff:ff:ff:ff inet 192.168.0.102/24 brd 192.168.0.255 scope global eth1 inet 192.168.0.200/24 brd 192.168.0.255 scope global secondary eth1 inet6 fe80::20c:29ff:fead:9f36/64 scope link valid_lft forever preferred_lft forever [root@node2 ~]# netstat -tnlp |grep httpd tcp 0 0 :::80 :::* LISTEN 2709/httpd
10、vip转移后再次访问
到此处，最基本最简单的heartbeat服务的高可用就完成了。
七、Heartbeat的共享存储
1、配置node3的NFS服务
[root@node3 ~]# yum -y install nfs-utils rpcbind [root@node3 ~]# mkdir /web/htdocs -p [root@node3 ~]# cat /etc/exports /web/htdocs 192.168.0.0/24(ro) [root@node3 ~]# /etc/init.d/rpcbind start [root@node3 ~]# /etc/init.d/nfs start [root@node3 ~]# showmount -e '192.168.0.103' Export list for 192.168.0.103: /web/htdocs 192.168.0.0/24 [root@node3 ~]# echo "<h1>node3 nfs server</h1>" > /web/htdocs/index.html
2、节点挂载测试
node1
[root@node1 ~]# mount -t nfs 192.168.0.103:/web/htdocs /mnt/ [root@node1 ~]# ll /mnt/ 总用量 4 -rw-r--r-- 1 nobody nobody 26 12月 25 21:53 index.html [root@node1 ~]# cat /mnt/index.html <h1>node3 nfs server</h1> [root@node1 ~]# df 文件系统 1K-块 已用 可用 已用% 挂载点 /dev/mapper/VolGroup-lv_root 16134560 1395740 13919212 10% / tmpfs 247208 0 247208 0% /dev/shm /dev/sda1 495844 32418 437826 7% /boot 192.168.0.103:/web/htdocs 16134560 1302528 14012416 9% /mnt [root@node1 ~]# umount /mnt/
node2
[root@node2 ~]# mount -t nfs 192.168.0.103:/web/htdocs /mnt/ [root@node2 ~]# ll /mnt/ 总用量 4 -rw-r--r-- 1 nobody nobody 26 12月 25 21:53 index.html [root@node2 ~]# cat /mnt/index.html <h1>node3 nfs server</h1> [root@node2 ~]# df 文件系统 1K-块 已用 可用 已用% 挂载点 /dev/mapper/VolGroup-lv_root 16134560 1416796 13898156 10% / tmpfs 247208 0 247208 0% /dev/shm /dev/sda1 495844 32418 437826 7% /boot 192.168.0.103:/web/htdocs 16134560 1302528 14012416 9% /mnt [root@node2 ~]# umount /mnt/
3、停止node1和node2节点的heartbeat服务
[root@node1 ~]# ssh node2 'service heartbeat stop' Stopping High-Availability services: Done. [root@node1 ~]# service heartbeat stop Stopping High-Availability services: Done.
4、修改haresource配置文件
[root@node1 ~]# vim /etc/ha.d/haresources node1.test.com IPaddr::192.168.0.200/24/eth1 Filesystem::192.168.0.103:/web/htdocs::/var/www/html::nfs httpd
5、拷贝修改后的haresource配置文件到node2
[root@node1 ~]# scp /etc/ha.d/haresources root@node2.test.com:/etc/ha.d/
6、启动节点的heartbeat服务
[root@node1 ~]# service heartbeat start Starting High-Availability services: INFO: Resource is stopped Done. [root@node1 ~]# ssh node2 "service heartbeat start" Starting High-Availability services: 2014/12/25_22:01:40 INFO: Resource is stopped Done.
7、浏览器测试访问
8、查看node1节点信息
[root@node1 ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:c7:14:97 brd ff:ff:ff:ff:ff:ff inet 192.168.0.101/24 brd 192.168.0.255 scope global eth1 inet 192.168.0.200/24 brd 192.168.0.255 scope global secondary eth1 inet6 fe80::20c:29ff:fec7:1497/64 scope link valid_lft forever preferred_lft forever [root@node1 ~]# netstat -tnlp |grep httpd tcp 0 0 :::80 :::* LISTEN 3301/httpd [root@node1 ~]# df 文件系统 1K-块 已用 可用 已用% 挂载点 /dev/mapper/VolGroup-lv_root 16134560 1395756 13919196 10% / tmpfs 247208 0 247208 0% /dev/shm /dev/sda1 495844 32418 437826 7% /boot 192.168.0.103:/web/htdocs 16134560 1302528 14012416 9% /var/www/html [root@node1 ~]# cat /var/www/html/index.html <h1>node3 nfs server</h1>
9、停止node1节点的heartbeat服务，进行切换，并查看vip信息，再次访问vip地址
[root@node1 ~]# service heartbeat stop Stopping High-Availability services: Done. [root@node1 ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:0c:29:c7:14:97 brd ff:ff:ff:ff:ff:ff inet 192.168.0.101/24 brd 192.168.0.255 scope global eth1 inet6 fe80::20c:29ff:fec7:1497/64 scope link valid_lft forever preferred_lft forever [root@node1 ~]# netstat -tnlp |grep httpd
八、测试Heartbeat高可用
正常关闭和重启主节点的heartbeat服务 或者 脚本切换主节点为备用节点
细节流程： 正常关闭Heartbeat服务：/etc/init.d/heartbeat stop && service heartbeat stop 脚本切换主节点为备用节点：sh /usr/share/heartbeat/hb_standby
在主节点node1上关闭heartbeat服务执行“service heartbeat stop”，正常关闭主节点的heartbeat服务进程。此时主节点通过“ip addr”命令查看主节点的网卡信息，正常情况下， 应该可以看到主节点已经释放了集群服务的ip(vip)地址，同时释放了挂载磁盘的共享分区，并且httpd服务处于停止状态。 然后登陆备用节点执行“ssh node2'”查看备用节点node2相关属性信息，在备用节点node2上用“ip addr”命令查看集群ip(vip)是否已经被接管，同时是否已经挂载上了共享磁盘分区， 并且httpd服务是否已经启动;得出的结论就是备用节点已经接管了vip地址，共享磁盘分区已经被挂载，httpd服务已经启动。 在这个过程中，使用ping命令对集群服务ip(vip)进行测试，可以看到集群服务ip一直处于可通状态，并没有任何延迟和堵塞现象，也就是说在正常关闭主节点node1上的heartbeat服务 的情况下，主备节点的切换时无缝的，HA对外提供的服务可以不间断运行。 接着，主节点的Heartbeat服务正常启动，那么备用节点的集群服务ip(vip)将被释放，同时卸载挂载的共享磁盘分区和停止httpd服务，反而主节点将再次接管集群服务ip(vip)和 挂载共享磁盘分区，其实备用节点释放资源与主节点绑定资源是同步进行的。因而，这个过程也是一个无缝切换。 但是大家需要注意的是主节点重新上线后，在进行ping测试的过程中会有一次中断，不过是瞬间的 影响不是很大。
到此，heartbeat的web高可用就完成了。后续会继续补充Heartbeat对mysql服务的高可用！
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