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Tony Bourke Server Load Balancing phần 5

Có nhiều lý do tại sao một trung tâm dữ liệu toàn bộ cài đặt có thể đi offline, chẳng hạn như cắt giảm chất xơ, một cúp điện, một Ngoài ra còn có một số hạn chế của các nhóm có sẵn, 256 là mô hình được sử dụng trong cấu hình này. Chúng tôi sẽ cấu hình nhóm 1, sau này sẽ được liên kết với vip-1: | 68 Chapter 7 NAT-BasedSLBNetworkArchitecture WebServers In Table 7-4 the web servers are configured on the nonrouted IP address space rather than routable IP address space. Other than that difference they are configured exactly as with the flat-based network architecture. The default routes are configured to point towards the load balancers. Table 7-4. Web server network configuration Unit ws-1 ws-2 ws-3 ws-4 IP address 10.0.0.100 10.0.0.101 10.0.0.102 10.0.0.103 Subnet mask 255.255.255.0 255.255.255.0 255.255.255.0 255.255.255.0 Default route 10.0.0.1 10.0.0.1 10.0.0.1 10.0.0.1 Service and port HTTP 80 HTTP 80 HTTP 80 HTTP 80 VIP Configuration The VIP configuration is shown in Table 7-5. The VIP is of course on the routable IP address space while the real servers are located on the nonrouted IP address space. The SLB units serve to perform the NAT between the two networks. Table 7-5. VIP configuration VIP vip-1 IP address 192.168.0.200 Subnet mask 255.255.255.0 Service and port Real servers active HTTP 80 10.0.0.100 10.0.0.101 10.0.0.102 10.0.0.103 Individual Pass-Through VIPs Since the web servers aren t directly available to the Internet it may be necessary to set up additional VIPs each corresponding with an individual web server. This would allow a user to browse each individual server which can be useful for troubleshooting and individual administration. This type of VIP is called an individual pass-through see Table 7-6 . Table 7-6. Pass-through VIP configuration VIP vip-1 vip-2 vip-3 vip-4 IP address 192.168.0.100 192.168.0.101 192.168.0.102 192.168.0.103 Subnet mask 255.255.255.0 255.255.255.0 255.255.255.0 255.255.255.0 Real server 10.0.0.100 10.0.0.101 10.0.0.102 10.0.0.103 Service and port HTTP 80 HTTP 80 HTTP 80 HTTP 80 Network Configuration 69 Switches There are two ways to implement switches into a NAT-based scenario using separate switches for the public network and server networks or using the same switches with VLAN separation. Which is more .