一、安装ipvs
sudo apt-get install ipvsadm
二、安装keepalived
sudo apt-get install keepalived
三、创建keepalived.conf文件
sudo gedit /etc/keepalived/keepalived.conf
四、配置keepalived.conf
说明：VIP: 192.168.2.68
real_server: 192.168.2.66(MASTER), 192.168.2.67(BACKUP)
# Global Configuration global_defs { lvs_id director1 } # VRRP Configuration vrrp_instance LVS { #定义虚拟路由，LVS 为虚拟路由的标示符，自己定义名称 state MASTER #备份服务器上将MASTER改为BACKUP interface eth0 virtual_router_id 51 #虚拟路由的ID，而且这个ID也是虚拟MAC最后一段的来源，这个ID号一般不能大于255，且这个ID一定不能有冲突 priority 150 #初始优先级 advert_int 1 #通告的个数 authentication { #认证机制 auth_type PASS #认证类型 auth_pass 123456 #密码，应该为随机的字符串 } virtual_ipaddress { #虚拟地址，即VIP 192.168.2.68
#(如果有多个VIP，继续换行填写.) } # Virtual Server Configuration - for WWW service virtual_server 192.168.2.68 80 { delay_loop 1 #(每隔1秒查询realserver状态) lb_algo rr #(lvs 算法) lb_kind DR #(Direct Route) persistence_timeout 60 #(同一IP的连接60秒内被分配到同一台realserver) protocol TCP #(用TCP协议检查realserver状态) # Real Server 1 configuration real_server 192.168.2.67 8080 { weight 1 #权重 TCP_CHECK { connection_timeout 10 #(10秒无响应超时) nb_get_retry 3 delay_before_retry 3 } } # Real Server 2 configuration real_server 192.168.2.66 8080 { weight 1 TCP_CHECK { connection_timeout 10 nb_get_retry 3 delay_before_retry 3 } } } }
1.配置vrrp ip为68(启动keepalived之后可使用ip addr可查看)
2.配置real_server 此处是67和66的一个集群
五、启动并查看keepalived
#service keepalived start 查看 keepalived状态 # ps -ef | grep keepalived root 4783 1 0 09:49 ? 00:00:00 keepalived -D root 4784 4783 0 09:49 ? 00:00:01 keepalived -D root 5191 4896 0 13:43 pts/2 00:00:00 grep keepalived 如果未能启动，请使用sudo启动或者检查配置文件 # tail -f /var/log/syslog Feb 21 14:18:48 localhost Keepalived_vrrp: Registering gratutious ARP shared channel Feb 21 14:18:48 localhost Keepalived_vrrp: Opening file '/etc/keepalived/keepalived.conf'. Feb 21 14:18:48 localhost Keepalived_vrrp: Configuration is using : 35706 Bytes Feb 21 14:18:48 localhost Keepalived_vrrp: Using LinkWatch kernel netlink reflector... Feb 21 14:18:49 localhost Keepalived_vrrp: VRRP sockpool: [ifindex(2), proto(112), fd(9,10)] Feb 21 14:18:50 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Transition to MASTER STATE Feb 21 14:18:51 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Entering MASTER STATE Feb 21 14:18:51 localhost Keepalived_vrrp: VRRP_Instance(VI_1) setting protocol VIPs. Feb 21 14:18:51 localhost Keepalived_vrrp: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 192.168.2.68 Feb 21 14:18:51 localhost avahi-daemon[2549]: Registering new address record for 192.168.2.68 on eth0. 可以看到VIP已经在主服务器上开启
到此lvs+keepalived就已经完成了，接下来就是nginx.
Append: 使用Keepalived管理nginx
! Configuration File for keepalived global_defs { # notification_email { # henryhe@starhubdev.com # } # notification_email_from happy@starhubdev.com # smtp_server 127.0.0.1 # smtp_connect_timeout 30 router_id LVS_DEVEL } vrrp_script chk_nginx { script "/etc/keepalived/check_nginx.sh" interval 1 weight 2 } vrrp_instance VI_1 { state BACKUP interface eno1 virtual_router_id 51 priority 200 advert_int 1 authentication { auth_type PASS auth_pass starhub } virtual_ipaddress { 172.31.34.92 } track_script { chk_nginx } } #virtual_server 172.31.34.92 3306 { # delay_loop 6 # lb_algo rr # lb_kind DR # nat_mask 255.255.255.248 # persistence_timeout 50 # protocol TCP # sorry_server 172.31.34.94 3306 # real_server 172.31.34.93 3306 { # weight 3 # notify_down /usr/local/bin/keepalived_notify.sh # TCP_CHECK { # connect_timeout 10 # nb_get_retry 3 # delay_before_retry 3 # connect_port 3306 # } # } }
check_nginx.sh
!/bin/bash status=$(ps -C nginx --no-heading|wc -l) if [ "${status}" = "0" ]; then /bin/systemctl start nginx.service #redhat7 /etc/init.d/nginx start #centos status2=$(ps -C nginx --no-heading|wc -l) if [ "${status2}" = "0" ]; then /bin/systemctl stop keepalived.service #redhat7 /etc/init.d/keepalived start #centos fi fi