一、简述HA cluster原理
高可用集群,英文原文为High Availability Cluster,简称HA Cluster;集群(cluster)就是一组计算机,它们作为一个整体向用户提供一组网络资源。这些单个的计算机系统就是集群的节点(node)。高可用性集群(HA cluster)是指如单系统一样地运行并支持(计算机)持续正常运行的一个主机群。
高可用集群的出现是为了使集群的整体服务尽可能可用,从而减少由计算机硬件和软件易错性所带来的损失。如果某个节点失效,它的备援节点将在几秒钟的时间内接管它的职责。因此,对于用户而言,集群永远不会停机。高可用集群软件的主要作用就是实现故障检查和业务切换的自动化。
简单的说高可用集群就是为了解决集群中的单点故障(SPoF),保证服务不间断运行的冗余(redundant)手段。
- SPoF:Single Point of Failure;单点故障
- 冗余(redundant):在两个节点上装一个软件程序,根据判断状态完成资源转移;
高可用集群的衡量标准
通常用平均无故障时间(MTTF)来度量系统的可靠性,用平均故障维修时间(MTTR)来度量系统的可维护性。于是可用性被定义为:HA=MTTF/(MTTF+MTTR)*100%
- 可用性衡量指标:
· 基本可用性:2个9;99%;年度停机时间87.6小时
· 较高可用性:3个9;99.9%;年度停机时间8.8小时
· 具有故障自动恢复能力的可用性:4个9;99.99%;年度停机时间53分钟
· 极高可用性:5个9;99.999%;年度停机时间5分钟
二、keepalived
- KeepAlived主要有两个功能:
- (1).能够对RealServer进行健康状况检查,支持4层、5层和7层协议进行健康检查;
- (2).对负载均衡调度器实现高可用,防止Director单点故障。
KeepAlived工作过程:
keepalived实现故障转移的功能是通过VRRP(virtual router redundancy protocol虚拟路由器冗余协议)协议来实现的。在keepalived正常工作的时候,主节点(master)会不断的发送心跳信息给备节点(backup),当备节点不能在一定时间内收到主节点的心跳信息时,备节点会认为节点宕了,然后会接管主节点上的资源,并继续向外提供服务保证其可用性。当主节点恢复的时候,备节点会自动让出资源并再次自动成为备节点。KeepAlived基于vrrp协议的软件实现,原生设计的目的为了高可用ipvs服务;
- 基于vrrp协议完成地址流动;
- 为vip地址所在的节点生成ipvs规则(在配置文件中预先定义);
- 为ipvs集群的各RS做健康状态检测;
- 基于脚本调用接口通过执行脚本完成脚本中定义的功能,进而影响集群事务;
- HA Cluser的配置前提:
(1) 各节点时间必须同步;ntp,chrony
(2) 确保iptales及selinux不会成为阻碍;
(3) 各节点之间可通过主机名互相通信(对KA并非必须);
建议使用/etc/hosts文件实现;
(4) 确保各节点的用于集群服务的接口支持MULTICAST通信;
D类:224-239 - Keepalived安装配置:
在CentOS6.4以后,keepalived随base仓库提供;
程序环境:
主配置文件:/etc/keepalived/keepalived.conf
主程序文件:/usr/sbin/keepalived
nit File:keepalived.service
Unit File的环境配置文件:/etc/sysconfig/keepalived配置文件组件部分:
TOP HIERACHY
- GLOBAL CONFIGURATION
- Global definitions
- Static routes/addresses
- VRRPD CONFIGURATION
- VRRP synchronization group(s):vrrp同步组;
- VRRP instance(s):每个vrrp instance即一个vrrp路由器;
- LVS CONFIGURATION
- Virtual server group(s)
- Virtual server(s):ipvs集群的vs和rs;
-
配置语法 :
- 配置虚拟器:
vrrp_instance
{ ...... }
- 专用参数:
state MASTER|BACKUP:
当前节点在此虚拟路由器上的初始状态;只能有一个是MASTER,余下的都应该为BACKUP;
interface IFACE_NAME:
绑定为当前虚拟路由器使用的物理接口;
virtual_router_id VRID:
当前虚拟路由器的唯一标识,范围是0-255;
priority 100:
当前主机在此虚拟路由器中的优先级;范围1-254;
advert_int 1:
vrrp通告的时间间隔;
authentication {
auth_type AH|PASS
auth_pass
}
virtual_ipaddress {
/ brd dev scope label
- 定义通知脚本:
notify_master |:当前节点成为主节点时触发的脚本;
notify_backup |:当前节点转为备节点时触发的脚本;
notify_fault |:当前节点转为“失败”状态时触发的脚本;
notify |:通用格式的通知触发机制,一个脚本可完成以上三种状态的转换时的通知;
- 虚拟服务器:
配置参数:
virtual_server IP port |
virtual_server fwmark int
{
...
real_server {
...
}
...
}
常用参数:
delay_loop
服务轮询的时间间隔;
lb_algo rr|wrr|lc|wlc|lblc|sh|dh:
定义调度方法;
lb_kind NAT|DR|TUN:
集群的类型;
persistence_timeout
持久连接时长;
protocol TCP:
服务协议,仅支持TCP;
sorry_server
备用服务器地址;
real_server
{
weight
notify_up |
notify_down |
HTTP_GET|SSL_GET|TCP_CHECK|SMTP_CHECK|MISC_CHECK { ... }:定义当前主机的健康状态检测方法;
}
- HTTP_GET|SSL_GET:应用层检测
HTTP_GET|SSL_GET {
url {
path :定义要监控的URL;
status_code :判断上述检测机制为健康状态的响应码;
digest :判断上述检测机制为健康状态的响应的内容的校验码;
}
nb_get_retry :重试次数;
delay_before_retry :重试之前的延迟时长;
connect_ip :向当前RS的哪个IP地址发起健康状态检测请求
connect_port :向当前RS的哪个PORT发起健康状态检测请求
bindto :发出健康状态检测请求时使用的源地址;
bind_port :发出健康状态检测请求时使用的源端口;
connect_timeout :连接请求的超时时长;
}
- TCP_CHECK:传输层检测
TCP_CHECK {
connect_ip :向当前RS的哪个IP地址发起健康状态检测请求
connect_port :向当前RS的哪个PORT发起健康状态检测请求
bindto :发出健康状态检测请求时使用的源地址;
bind_port :发出健康状态检测请求时使用的源端口;
connect_timeout :连接请求的超时时长;
}
三、Keepalived实现主从、主主架构
- 主从配置:
准备2个节点:node1:192.168.80.136;node2:192.168.80.230
同步时间:[root@node1 ~]# ntpdate 192.168.80.1
安装配置keepalived:
在node1如下配置
[root@node1 ~]# yum install -y keepalived #安装keepalived
[root@node1 ~]# cd /etc/keepalived/
[root@node1 keepalived]# cp keepalived.conf{,.bak} #备份keepalived原始配置文件
[root@node1 keepalived]# vim keepalived.conf
# 在打开的文件中配置如下内容
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node1
vrrp_mcast_group4 224.1.105.33
}
vrrp_instance VI_1 {
state MASTER #当前节点在此虚拟路由器上的初始状态;只能有一个是MASTER,余下的都应该为BACKUP;
interface eth33
virtual_router_id 33
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.80.93 dev ens33 label ens33:0
}
}
在node2节点上如下配置:
[root@node2 ~]# yum install -y keepalived #安装keepalived
[root@node2 ~]# cd /etc/keepalived
[root@node2 keepalived]# cp keepalived.conf{,.bak} #备份keepalived原始配置文件
[root@node2 keepalived]# vim keepalived.conf
# 在打开的文件中配置如下内容
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node2
vrrp_mcast_group4 224.1.105.33
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 33
priority 96
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.80.93 dev ens33 label ens33:0
}
}
启动node2节点keepalived测试
[root@node2 keepalived]# systemctl start keepalived
[root@node2 keepalived]# ifconfig
...
ens33:0: flags=4163 mtu 1500
inet 192.168.80.93 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:40:ee:7c txqueuelen 1000 (Ethernet)
...
[root@node2 keepalived]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since Wed 2019-01-16 12:24:22 CST; 5s ago
Process: 3069 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 3070 (keepalived)
Tasks: 3
CGroup: /system.slice/keepalived.service
├─3070 /usr/sbin/keepalived -D
├─3071 /usr/sbin/keepalived -D
└─3072 /usr/sbin/keepalived -D
Jan 16 12:24:22 node2 Keepalived_healthcheckers[3071]: Activating healthchecker for service [10.10.10.3]:1358
Jan 16 12:24:25 node2 Keepalived_vrrp[3072]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jan 16 12:24:26 node2 Keepalived_vrrp[3072]: VRRP_Instance(VI_1) Entering MASTER STATE
Jan 16 12:24:26 node2 Keepalived_vrrp[3072]: VRRP_Instance(VI_1) setting protocol VIPs.
Jan 16 12:24:26 node2 Keepalived_vrrp[3072]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 12:24:26 node2 Keepalived_vrrp[3072]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on ens33 f...80.93
Jan 16 12:24:26 node2 Keepalived_vrrp[3072]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 12:24:26 node2 Keepalived_vrrp[3072]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 12:24:26 node2 Keepalived_vrrp[3072]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 12:24:26 node2 Keepalived_vrrp[3072]: Sending gratuitous ARP on ens33 for 192.168.80.93
# 在node1节点上抓包测试
[root@node1 keepalived]# tcpdump -i ens33 -nn host 224.1.105.33
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ens33, link-type EN10MB (Ethernet), capture size 262144 bytes
12:25:16.821399 IP 192.168.80.230 > 224.1.105.33: VRRPv2, Advertisement, vrid 33, prio 96, authtype simple, intvl 1s, length 20
12:25:17.822579 IP 192.168.80.230 > 224.1.105.33: VRRPv2, Advertisement, vrid 33, prio 96, authtype simple, intvl 1s, length 20
启动node1节点keepalived:
[root@node1 keepalived]# systemctl start keepalived
[root@node1 keepalived]# ifconfig
...
ens33:0: flags=4163 mtu 1500
inet 192.168.80.93 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:44:bc:b6 txqueuelen 1000 (Ethernet)
...
[root@node1 keepalived]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since Wed 2019-01-16 16:42:49 CST; 5s ago
Process: 6090 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 6091 (keepalived)
Tasks: 3
CGroup: /system.slice/keepalived.service
├─6091 /usr/sbin/keepalived -D
├─6092 /usr/sbin/keepalived -D
└─6093 /usr/sbin/keepalived -D
Jan 16 16:42:49 node1 Keepalived_vrrp[6093]: VRRP_Instance(VI_1) forcing a new MASTER election
Jan 16 16:42:50 node1 Keepalived_vrrp[6093]: VRRP_Instance(VI_1) Transition to MASTER STATE
Jan 16 16:42:51 node1 Keepalived_vrrp[6093]: VRRP_Instance(VI_1) Entering MASTER STATE
Jan 16 16:42:51 node1 Keepalived_vrrp[6093]: VRRP_Instance(VI_1) setting protocol VIPs.
Jan 16 16:42:51 node1 Keepalived_vrrp[6093]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 16:42:51 node1 Keepalived_vrrp[6093]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on ens33 f...80.93
Jan 16 16:42:51 node1 Keepalived_vrrp[6093]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 16:42:51 node1 Keepalived_vrrp[6093]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 16:42:51 node1 Keepalived_vrrp[6093]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 16:42:51 node1 Keepalived_vrrp[6093]: Sending gratuitous ARP on ens33 for 192.168.80.93
Hint: Some lines were ellipsized, use -l to show in full.
# node2节点抓包测试
[root@node2 keepalived]# tcpdump -i ens33 -nn host 224.1.105.33
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ens33, link-type EN10MB (Ethernet), capture size 262144 bytes
16:45:21.875150 IP 192.168.80.136 > 224.1.105.33: VRRPv2, Advertisement, vrid 33, prio 100, authtype simple, intvl 1s, length 20
16:45:22.876093 IP 192.168.80.136 > 224.1.105.33: VRRPv2, Advertisement, vrid 33, prio 100, authtype simple, intvl 1s, length 20
- 双主模式配置
# node1节点上修改keepalived.cnf配置文件,在最后添加如下内容
vrrp_instance VI_2 {
stat BACKUP
interface ens33
virtual_router_id 34
priority 96
advert_int 1
authentication {
auth_type PASS
auth_pass XXXX1111
}
virtual_ipaddress {
192.168.80.93 dev ens33 label ens33:0
}
}
# node2节点上修改keepalived.conf配置文件,在最后添加如下内容
vrrp_instance VI_2 {
state MASTER
interface ens33
virtual_router_id 34
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass XXXX1111
}
virtual_ipaddress {
192.168.80.93 dev ens33 label ens33:0
}
}
# 停止keepalived服务,再重新启动
[root@node2 keepalived]# systemctl stop keepalived
[root@node2 keepalived]# systemctl start keepalived
[root@node2 keepalived]# ip a l
...
2: ens33: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:40:ee:7c brd ff:ff:ff:ff:ff:ff
inet 192.168.80.230/24 brd 192.168.80.255 scope global noprefixroute dynamic ens33
valid_lft 62510sec preferred_lft 62510sec
inet 192.168.80.93/32 scope global ens33:0
valid_lft forever preferred_lft forever
inet6 fe80::9c20:6c3a:b648:5b22/64 scope link noprefixroute
valid_lft forever preferred_lft forever
inet6 fe80::5291:5f99:50eb:805/64 scope link tentative noprefixroute dadfailed
valid_lft forever preferred_lft forever
...
[root@node2 keepalived]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since Wed 2019-01-16 17:37:47 CST; 6min ago
Process: 6300 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 6302 (keepalived)
Tasks: 3
CGroup: /system.slice/keepalived.service
├─6302 /usr/sbin/keepalived -D
├─6303 /usr/sbin/keepalived -D
└─6304 /usr/sbin/keepalived -D
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Adding sorry server [192.168.200.200]:1358 to VS [10.1...1358
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Removing alive servers from the pool for VS [10.10.10.2]:1358
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Remote SMTP server [127.0.0.1]:25 connected.
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: SMTP alert successfully sent.
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Timeout connecting server [192.168.201.100]:443.
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Check on service [192.168.201.100]:443 failed after 3 retry.
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Removing service [192.168.201.100]:443 from VS [192.16...:443
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Lost quorum 1-0=1 > 0 for VS [192.168.200.100]:443
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Remote SMTP server [127.0.0.1]:25 connected.
Jan 16 17:38:15 node2 Keepalived_healthcheckers[6303]: SMTP alert successfully sent.
Hint: Some lines were ellipsized, use -l to show in full.
You have new mail in /var/spool/mail/root
# 重新启动node1节点的keepalived服务
[root@node1 keepalived]# systemctl start keepalived
[root@node1 keepalived]# ip a l
...
2: ens33: mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 00:0c:29:44:bc:b6 brd ff:ff:ff:ff:ff:ff
inet 192.168.80.136/24 brd 192.168.80.255 scope global noprefixroute dynamic ens33
valid_lft 62131sec preferred_lft 62131sec
inet 192.168.80.93/32 scope global ens33:0
valid_lft forever preferred_lft forever
inet6 fe80::5291:5f99:50eb:805/64 scope link noprefixroute
valid_lft forever preferred_lft forever
...
[root@node1 keepalived]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since Wed 2019-01-16 17:44:08 CST; 10s ago
Process: 6681 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 6682 (keepalived)
Tasks: 3
CGroup: /system.slice/keepalived.service
├─6682 /usr/sbin/keepalived -D
├─6683 /usr/sbin/keepalived -D
└─6684 /usr/sbin/keepalived -D
Jan 16 17:44:15 node1 Keepalived_healthcheckers[6683]: Timeout connecting server [192.168.200.4]:1358.
Jan 16 17:44:15 node1 Keepalived_healthcheckers[6683]: Timeout connecting server [192.168.200.5]:1358.
Jan 16 17:44:16 node1 Keepalived_vrrp[6684]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 17:44:16 node1 Keepalived_vrrp[6684]: VRRP_Instance(VI_1) Sending/queueing gratuitous ARPs on ens33 f...80.93
Jan 16 17:44:16 node1 Keepalived_vrrp[6684]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 17:44:16 node1 Keepalived_vrrp[6684]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 17:44:16 node1 Keepalived_vrrp[6684]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 17:44:16 node1 Keepalived_vrrp[6684]: Sending gratuitous ARP on ens33 for 192.168.80.93
Jan 16 17:44:17 node1 Keepalived_healthcheckers[6683]: Timeout connecting server [192.168.200.3]:1358.
Jan 16 17:44:17 node1 Keepalived_healthcheckers[6683]: Timeout connecting server [192.168.201.100]:443.
Hint: Some lines were ellipsized, use -l to show in full.
[root@node1 keepalived]# vim keepalived.conf
You have new mail in /var/spool/mail/root
# 在node2节点上status查看状态
[root@node2 keepalived]# systemctl status keepalived
● keepalived.service - LVS and VRRP High Availability Monitor
Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
Active: active (running) since Wed 2019-01-16 17:37:47 CST; 6min ago
Process: 6300 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
Main PID: 6302 (keepalived)
Tasks: 3
CGroup: /system.slice/keepalived.service
├─6302 /usr/sbin/keepalived -D
├─6303 /usr/sbin/keepalived -D
└─6304 /usr/sbin/keepalived -D
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: SMTP alert successfully sent.
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Timeout connecting server [192.168.201.100]:443.
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Check on service [192.168.201.100]:443 failed after 3 retry.
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Removing service [192.168.201.100]:443 from VS [192.16...:443
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Lost quorum 1-0=1 > 0 for VS [192.168.200.100]:443
Jan 16 17:38:14 node2 Keepalived_healthcheckers[6303]: Remote SMTP server [127.0.0.1]:25 connected.
Jan 16 17:38:15 node2 Keepalived_healthcheckers[6303]: SMTP alert successfully sent.
Jan 16 17:44:09 node2 Keepalived_vrrp[6304]: VRRP_Instance(VI_1) Received advert with higher priority 100, ours 96
Jan 16 17:44:09 node2 Keepalived_vrrp[6304]: VRRP_Instance(VI_1) Entering BACKUP STATE
Jan 16 17:44:09 node2 Keepalived_vrrp[6304]: VRRP_Instance(VI_1) removing protocol VIPs.
Hint: Some lines were ellipsized, use -l to show in full.
- 通知脚本使用方式
#编辑通知脚本
#!/bin/bash
#keepalived 邮件通知脚本
#date:2019-1-16
contact = 'root@localhost'
notify () {
local mailsubject="$(hostname) to be $1 vip floating"
local mailbody="$(date + '%F %T'): vrrp transition, $(hostname) changed to be $1"
echo "$mailbody" | mail -s "$mailsubject" $contact
}
case $1 in
master)
notify master
;;
backup)
notify backup
;;
fault)
notify fault
;;
*)
echo "Usage: $(basename $0) {master|backup|fault}"
exit 1
;;
esac
# 在keepalived.conf中的vrrp实例中添加如下内容
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 33
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.80.93 dev ens33 label ens33:0
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
-
以dr集群架构配置示例
dr架构.png
[root@node1 keepalived]# yum install -y ipvsadm #安装ipvsadm以便查看生成的规则
# 编辑keepalived.conf为node1和node2生成规则
[root@node1 keepalived]# vim keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id node1
vrrp_mcast_group4 224.1.105.33
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 33
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.80.93 dev ens33 label ens33:0
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"
}
virtual_server 192.168.80.93 80 {
delay_loop 1
lb_algo wrr
lb_kind DR
protocol TCP
sorry_server 127.0.0.1 80
real_server 192.168.80.176 80 {
weight 1
HTTP_GET {
url {
path /index.html
status_conde 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.80.85 80 {
weight 1
HTTP_GET {
url {
path /index.html
status_conde 200
}
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
# 将此配置文件拷贝到node2节点,并修改以下几行
router_id node2
state BACKUP
priority 96
# 重新启动node2节点的keepalived服务
[root@node2 keepalived]# systemctl stop keepalived
[root@node2 keepalived]# systemctl start keepalived
[root@node2 keepalived]# ifconfig
...
ens33:0: flags=4163 mtu 1500
inet 192.168.80.93 netmask 255.255.255.255 broadcast 0.0.0.0
ether 00:0c:29:40:ee:7c txqueuelen 1000 (Ethernet)
...
[root@node2 keepalived]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.80.93:80 wrr
-> 192.168.80.85:80 Route 1 0 0
-> 192.168.80.176:80 Route 1 0 0
# 启动node1的keepalived服务,通过下面查看ip和status后看到node1已经成功上线
[root@node2 keepalived]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 192.168.80.93:80 wrr
-> 192.168.80.85:80 Route 1 0 0
-> 192.168.80.176:80 Route 1 0 0
# 使用client访问服务正常
[root@localhost ~]# curl http://192.168.80.93
RealServer 1
[root@localhost ~]# curl http://192.168.80.93
RealServer 2