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Keepalived高可用集群应用场景与配置
1.Keepalived单实例主备模式集群方案
这是最简单的模式,不只考虑高可用集群,先不考虑后方的Nginx负载均衡集群,即后端的服务器集群,参考下面的图示:
其对应的Keepalived核心配置如下:
lb01
global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id lb01 # 用来标识一个Keepalived高可用集群中的一个节点服务器,因此是唯一的 } vrrp_instance VI_1 { state MASTER # 主 interface eth0 virtual_router_id 55 # 主备两台服务器的该值应该要相同 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.12/24 dev eth0 label eth0:1 } }
lb02
global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id lb02 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 55 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.12/24 dev eth0 label eth0:1 } }
2.Nginx负载均衡集群配合Keepalived单实例主备模式集群方案
在1的基础上,同时考虑后端的Nginx负载均衡集群,参考下面的图示:
其对应的Keepalived和Nginx配置如下:
lb01
Keepalive配置:
failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id lb01 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 55 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.12/24 dev eth0 label eth0:1 } }
Nginx配置:
[root@lb01 conf]# cat nginx.conf worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream www_server_pools { server 10.0.0.9:80 weight=1; server 10.0.0.10:80 weight=1; } server { listen 10.0.0.12:80; server_name www.xpleaf.org; location / { proxy_pass http://www_server_pools; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; } } }
lb02
Keepalived配置:
failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id lb02 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 55 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.12/24 dev eth0 label eth0:1 } }
Nginx配置:
[root@lb02 conf]# cat nginx.conf worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream www_server_pools { server 10.0.0.9:80 weight=1; server 10.0.0.10:80 weight=1; } server { listen 10.0.0.12:80; server_name www.xpleaf.org; location / { proxy_pass http://www_server_pools; proxy_set_header Host $host; proxy_set_header X-Forwarded-For $remote_addr; } } }
3.Keepalived双实例双主模式集群方案
参考下面图示:
其对应的Keepalive核心配置如下:
lb01
global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 127.0.0.1 smtp_connect_timeout 30 router_id lb01 } vrrp_instance VI_1 { state MASTER interface eth0 virtual_router_id 55 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.12/24 dev eth0 label eth0:1 } } vrrp_instance VI_2 { state BACKUP interface eth0 virtual_router_id 55 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.13/24 dev eth0 label eth0:2 } }
lb02
global_defs { notification_email { acassen@firewall.loc failover@firewall.loc sysadmin@firewall.loc } notification_email_from Alexandre.Cassen@firewall.loc smtp_server 192.168.200.1 smtp_connect_timeout 30 router_id lb02 } vrrp_instance VI_1 { state BACKUP interface eth0 virtual_router_id 55 priority 100 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.12/24 dev eth0 label eth0:1 } } vrrp_instance VI_2 { state MASTER interface eth0 virtual_router_id 56 priority 150 advert_int 1 authentication { auth_type PASS auth_pass 1111 } virtual_ipaddress { 10.0.0.13/24 dev eth0 label eth0:2 } }
如此一来,两个Keepalived集群节点的资源都得到了充分利用,可以考虑两个实例为不同的业务提供服务,例如,实例1可以作为业务bbs.xpleaf.org的主用设备,实例2可以作为业务blog.xpleaf.org的主用设备。
然后在每个高可用集群节点中,为两个不同的业务分别配置两个不同的upstream服务器池,从而实现前端反向代理高可用和负载均衡,高可用集群后端的服务器池在不同的业务中也能提供负载均衡。
结合上面的分析,就可以得到Nginx负载均衡配合Keepalived双实例双主模式的场景了。
4.Nginx负载均衡集群配合Keepalived双实例双主模式集群方案
根据3的分析结果,参考下面的图示,注意下面这个图中的Keepalive配置与3的是一样的:
对应Nginx的配置如下:
lb01
worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream bbs_server_pools { # bbs业务服务器池 server 10.0.0.101:80 weight=1; server 10.0.0.102:80 weight=1; # 假设10.0.0.101和10.0.0.102为bbs业务的两个集群节点 } upstream blog_server_pools { # blog业务服务器池 server 10.0.0.103:80 weight=1; server 10.0.0.104:80 weight=1; # 假设10.0.0.103和10.0.0.104为bbs业务的两个集群节点 } server { listen 10.0.0.12:80; server_name bbs.xpleaf.org; location / { proxy_pass http://bbs_server_pools; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header Host $host; } } server { listen 10.0.0.13:80; server_name blog.xpleaf.org; location / { proxy_pass http://blog_server_pools; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header Host $host; } } }
lb02
worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream bbs_server_pools { # bbs业务服务器池 server 10.0.0.101:80 weight=1; server 10.0.0.102:80 weight=1; # 假设10.0.0.101和10.0.0.102为bbs业务的两个集群节点 } upstream blog_server_pools { # blog业务服务器池 server 10.0.0.103:80 weight=1; server 10.0.0.104:80 weight=1; # 假设10.0.0.103和10.0.0.104为bbs业务的两个集群节点 } server { listen 10.0.0.12:80; server_name bbs.xpleaf.org; location / { proxy_pass http://bbs_server_pools; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header Host $host; } } server { listen 10.0.0.13:80; server_name blog.xpleaf.org; location / { proxy_pass http://blog_server_pools; proxy_set_header X-Forwarded-For $remote_addr; proxy_set_header Host $host; } } }
可以看到,两台负载均衡器的Nginx配置是一样的。
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Keepalived高可用集群应用场景与配置