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1da177e4 LT |
1 | # |
2 | # IP Virtual Server configuration | |
3 | # | |
a6938a1e | 4 | menuconfig IP_VS |
1da177e4 | 5 | tristate "IP virtual server support (EXPERIMENTAL)" |
6a2e9b73 | 6 | depends on NETFILTER |
1da177e4 LT |
7 | ---help--- |
8 | IP Virtual Server support will let you build a high-performance | |
9 | virtual server based on cluster of two or more real servers. This | |
10 | option must be enabled for at least one of the clustered computers | |
11 | that will take care of intercepting incoming connections to a | |
12 | single IP address and scheduling them to real servers. | |
13 | ||
14 | Three request dispatching techniques are implemented, they are | |
15 | virtual server via NAT, virtual server via tunneling and virtual | |
16 | server via direct routing. The several scheduling algorithms can | |
17 | be used to choose which server the connection is directed to, | |
18 | thus load balancing can be achieved among the servers. For more | |
19 | information and its administration program, please visit the | |
20 | following URL: <http://www.linuxvirtualserver.org/>. | |
21 | ||
22 | If you want to compile it in kernel, say Y. To compile it as a | |
23 | module, choose M here. If unsure, say N. | |
24 | ||
a6938a1e JE |
25 | if IP_VS |
26 | ||
1da177e4 LT |
27 | config IP_VS_DEBUG |
28 | bool "IP virtual server debugging" | |
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29 | ---help--- |
30 | Say Y here if you want to get additional messages useful in | |
31 | debugging the IP virtual server code. You can change the debug | |
32 | level in /proc/sys/net/ipv4/vs/debug_level | |
33 | ||
34 | config IP_VS_TAB_BITS | |
35 | int "IPVS connection table size (the Nth power of 2)" | |
1da177e4 LT |
36 | default "12" |
37 | ---help--- | |
38 | The IPVS connection hash table uses the chaining scheme to handle | |
39 | hash collisions. Using a big IPVS connection hash table will greatly | |
40 | reduce conflicts when there are hundreds of thousands of connections | |
41 | in the hash table. | |
42 | ||
43 | Note the table size must be power of 2. The table size will be the | |
44 | value of 2 to the your input number power. The number to choose is | |
45 | from 8 to 20, the default number is 12, which means the table size | |
46 | is 4096. Don't input the number too small, otherwise you will lose | |
47 | performance on it. You can adapt the table size yourself, according | |
48 | to your virtual server application. It is good to set the table size | |
49 | not far less than the number of connections per second multiplying | |
50 | average lasting time of connection in the table. For example, your | |
51 | virtual server gets 200 connections per second, the connection lasts | |
52 | for 200 seconds in average in the connection table, the table size | |
53 | should be not far less than 200x200, it is good to set the table | |
54 | size 32768 (2**15). | |
55 | ||
56 | Another note that each connection occupies 128 bytes effectively and | |
57 | each hash entry uses 8 bytes, so you can estimate how much memory is | |
58 | needed for your box. | |
59 | ||
60 | comment "IPVS transport protocol load balancing support" | |
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61 | |
62 | config IP_VS_PROTO_TCP | |
63 | bool "TCP load balancing support" | |
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64 | ---help--- |
65 | This option enables support for load balancing TCP transport | |
66 | protocol. Say Y if unsure. | |
67 | ||
68 | config IP_VS_PROTO_UDP | |
69 | bool "UDP load balancing support" | |
1da177e4 LT |
70 | ---help--- |
71 | This option enables support for load balancing UDP transport | |
72 | protocol. Say Y if unsure. | |
73 | ||
409a1966 JV |
74 | config IP_VS_PROTO_AH_ESP |
75 | bool | |
76 | depends on UNDEFINED | |
77 | ||
1da177e4 LT |
78 | config IP_VS_PROTO_ESP |
79 | bool "ESP load balancing support" | |
409a1966 | 80 | select IP_VS_PROTO_AH_ESP |
1da177e4 | 81 | ---help--- |
44c09201 | 82 | This option enables support for load balancing ESP (Encapsulation |
1da177e4 LT |
83 | Security Payload) transport protocol. Say Y if unsure. |
84 | ||
85 | config IP_VS_PROTO_AH | |
86 | bool "AH load balancing support" | |
409a1966 | 87 | select IP_VS_PROTO_AH_ESP |
1da177e4 LT |
88 | ---help--- |
89 | This option enables support for load balancing AH (Authentication | |
90 | Header) transport protocol. Say Y if unsure. | |
91 | ||
92 | comment "IPVS scheduler" | |
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93 | |
94 | config IP_VS_RR | |
95 | tristate "round-robin scheduling" | |
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96 | ---help--- |
97 | The robin-robin scheduling algorithm simply directs network | |
98 | connections to different real servers in a round-robin manner. | |
99 | ||
100 | If you want to compile it in kernel, say Y. To compile it as a | |
101 | module, choose M here. If unsure, say N. | |
102 | ||
103 | config IP_VS_WRR | |
104 | tristate "weighted round-robin scheduling" | |
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105 | ---help--- |
106 | The weighted robin-robin scheduling algorithm directs network | |
107 | connections to different real servers based on server weights | |
108 | in a round-robin manner. Servers with higher weights receive | |
109 | new connections first than those with less weights, and servers | |
110 | with higher weights get more connections than those with less | |
111 | weights and servers with equal weights get equal connections. | |
112 | ||
113 | If you want to compile it in kernel, say Y. To compile it as a | |
114 | module, choose M here. If unsure, say N. | |
115 | ||
116 | config IP_VS_LC | |
117 | tristate "least-connection scheduling" | |
1da177e4 LT |
118 | ---help--- |
119 | The least-connection scheduling algorithm directs network | |
120 | connections to the server with the least number of active | |
121 | connections. | |
122 | ||
123 | If you want to compile it in kernel, say Y. To compile it as a | |
124 | module, choose M here. If unsure, say N. | |
125 | ||
126 | config IP_VS_WLC | |
127 | tristate "weighted least-connection scheduling" | |
1da177e4 LT |
128 | ---help--- |
129 | The weighted least-connection scheduling algorithm directs network | |
130 | connections to the server with the least active connections | |
131 | normalized by the server weight. | |
132 | ||
133 | If you want to compile it in kernel, say Y. To compile it as a | |
134 | module, choose M here. If unsure, say N. | |
135 | ||
136 | config IP_VS_LBLC | |
137 | tristate "locality-based least-connection scheduling" | |
1da177e4 LT |
138 | ---help--- |
139 | The locality-based least-connection scheduling algorithm is for | |
140 | destination IP load balancing. It is usually used in cache cluster. | |
141 | This algorithm usually directs packet destined for an IP address to | |
142 | its server if the server is alive and under load. If the server is | |
143 | overloaded (its active connection numbers is larger than its weight) | |
144 | and there is a server in its half load, then allocate the weighted | |
145 | least-connection server to this IP address. | |
146 | ||
147 | If you want to compile it in kernel, say Y. To compile it as a | |
148 | module, choose M here. If unsure, say N. | |
149 | ||
150 | config IP_VS_LBLCR | |
151 | tristate "locality-based least-connection with replication scheduling" | |
1da177e4 LT |
152 | ---help--- |
153 | The locality-based least-connection with replication scheduling | |
154 | algorithm is also for destination IP load balancing. It is | |
155 | usually used in cache cluster. It differs from the LBLC scheduling | |
156 | as follows: the load balancer maintains mappings from a target | |
157 | to a set of server nodes that can serve the target. Requests for | |
158 | a target are assigned to the least-connection node in the target's | |
159 | server set. If all the node in the server set are over loaded, | |
160 | it picks up a least-connection node in the cluster and adds it | |
161 | in the sever set for the target. If the server set has not been | |
162 | modified for the specified time, the most loaded node is removed | |
163 | from the server set, in order to avoid high degree of replication. | |
164 | ||
165 | If you want to compile it in kernel, say Y. To compile it as a | |
166 | module, choose M here. If unsure, say N. | |
167 | ||
168 | config IP_VS_DH | |
169 | tristate "destination hashing scheduling" | |
1da177e4 LT |
170 | ---help--- |
171 | The destination hashing scheduling algorithm assigns network | |
172 | connections to the servers through looking up a statically assigned | |
173 | hash table by their destination IP addresses. | |
174 | ||
175 | If you want to compile it in kernel, say Y. To compile it as a | |
176 | module, choose M here. If unsure, say N. | |
177 | ||
178 | config IP_VS_SH | |
179 | tristate "source hashing scheduling" | |
1da177e4 LT |
180 | ---help--- |
181 | The source hashing scheduling algorithm assigns network | |
182 | connections to the servers through looking up a statically assigned | |
183 | hash table by their source IP addresses. | |
184 | ||
185 | If you want to compile it in kernel, say Y. To compile it as a | |
186 | module, choose M here. If unsure, say N. | |
187 | ||
188 | config IP_VS_SED | |
189 | tristate "shortest expected delay scheduling" | |
1da177e4 LT |
190 | ---help--- |
191 | The shortest expected delay scheduling algorithm assigns network | |
192 | connections to the server with the shortest expected delay. The | |
193 | expected delay that the job will experience is (Ci + 1) / Ui if | |
194 | sent to the ith server, in which Ci is the number of connections | |
cab00891 | 195 | on the ith server and Ui is the fixed service rate (weight) |
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196 | of the ith server. |
197 | ||
198 | If you want to compile it in kernel, say Y. To compile it as a | |
199 | module, choose M here. If unsure, say N. | |
200 | ||
201 | config IP_VS_NQ | |
202 | tristate "never queue scheduling" | |
1da177e4 LT |
203 | ---help--- |
204 | The never queue scheduling algorithm adopts a two-speed model. | |
205 | When there is an idle server available, the job will be sent to | |
206 | the idle server, instead of waiting for a fast one. When there | |
207 | is no idle server available, the job will be sent to the server | |
208 | that minimize its expected delay (The Shortest Expected Delay | |
209 | scheduling algorithm). | |
210 | ||
211 | If you want to compile it in kernel, say Y. To compile it as a | |
212 | module, choose M here. If unsure, say N. | |
213 | ||
214 | comment 'IPVS application helper' | |
1da177e4 LT |
215 | |
216 | config IP_VS_FTP | |
217 | tristate "FTP protocol helper" | |
a6938a1e | 218 | depends on IP_VS_PROTO_TCP |
1da177e4 LT |
219 | ---help--- |
220 | FTP is a protocol that transfers IP address and/or port number in | |
221 | the payload. In the virtual server via Network Address Translation, | |
222 | the IP address and port number of real servers cannot be sent to | |
223 | clients in ftp connections directly, so FTP protocol helper is | |
224 | required for tracking the connection and mangling it back to that of | |
225 | virtual service. | |
226 | ||
227 | If you want to compile it in kernel, say Y. To compile it as a | |
228 | module, choose M here. If unsure, say N. | |
229 | ||
a6938a1e | 230 | endif # IP_VS |