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225 lines
8.8 KiB
Plaintext
225 lines
8.8 KiB
Plaintext
#
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# IP Virtual Server configuration
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#
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menuconfig IP_VS
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tristate "IP virtual server support (EXPERIMENTAL)"
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depends on NETFILTER
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---help---
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IP Virtual Server support will let you build a high-performance
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virtual server based on cluster of two or more real servers. This
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option must be enabled for at least one of the clustered computers
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that will take care of intercepting incoming connections to a
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single IP address and scheduling them to real servers.
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Three request dispatching techniques are implemented, they are
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virtual server via NAT, virtual server via tunneling and virtual
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server via direct routing. The several scheduling algorithms can
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be used to choose which server the connection is directed to,
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thus load balancing can be achieved among the servers. For more
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information and its administration program, please visit the
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following URL: <http://www.linuxvirtualserver.org/>.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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if IP_VS
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config IP_VS_DEBUG
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bool "IP virtual server debugging"
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---help---
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Say Y here if you want to get additional messages useful in
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debugging the IP virtual server code. You can change the debug
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level in /proc/sys/net/ipv4/vs/debug_level
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config IP_VS_TAB_BITS
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int "IPVS connection table size (the Nth power of 2)"
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default "12"
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---help---
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The IPVS connection hash table uses the chaining scheme to handle
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hash collisions. Using a big IPVS connection hash table will greatly
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reduce conflicts when there are hundreds of thousands of connections
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in the hash table.
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Note the table size must be power of 2. The table size will be the
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value of 2 to the your input number power. The number to choose is
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from 8 to 20, the default number is 12, which means the table size
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is 4096. Don't input the number too small, otherwise you will lose
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performance on it. You can adapt the table size yourself, according
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to your virtual server application. It is good to set the table size
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not far less than the number of connections per second multiplying
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average lasting time of connection in the table. For example, your
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virtual server gets 200 connections per second, the connection lasts
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for 200 seconds in average in the connection table, the table size
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should be not far less than 200x200, it is good to set the table
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size 32768 (2**15).
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Another note that each connection occupies 128 bytes effectively and
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each hash entry uses 8 bytes, so you can estimate how much memory is
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needed for your box.
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comment "IPVS transport protocol load balancing support"
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config IP_VS_PROTO_TCP
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bool "TCP load balancing support"
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---help---
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This option enables support for load balancing TCP transport
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protocol. Say Y if unsure.
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config IP_VS_PROTO_UDP
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bool "UDP load balancing support"
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---help---
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This option enables support for load balancing UDP transport
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protocol. Say Y if unsure.
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config IP_VS_PROTO_ESP
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bool "ESP load balancing support"
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---help---
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This option enables support for load balancing ESP (Encapsulation
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Security Payload) transport protocol. Say Y if unsure.
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config IP_VS_PROTO_AH
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bool "AH load balancing support"
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---help---
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This option enables support for load balancing AH (Authentication
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Header) transport protocol. Say Y if unsure.
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comment "IPVS scheduler"
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config IP_VS_RR
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tristate "round-robin scheduling"
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---help---
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The robin-robin scheduling algorithm simply directs network
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connections to different real servers in a round-robin manner.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_WRR
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tristate "weighted round-robin scheduling"
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---help---
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The weighted robin-robin scheduling algorithm directs network
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connections to different real servers based on server weights
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in a round-robin manner. Servers with higher weights receive
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new connections first than those with less weights, and servers
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with higher weights get more connections than those with less
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weights and servers with equal weights get equal connections.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_LC
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tristate "least-connection scheduling"
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---help---
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The least-connection scheduling algorithm directs network
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connections to the server with the least number of active
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connections.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_WLC
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tristate "weighted least-connection scheduling"
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---help---
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The weighted least-connection scheduling algorithm directs network
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connections to the server with the least active connections
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normalized by the server weight.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_LBLC
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tristate "locality-based least-connection scheduling"
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---help---
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The locality-based least-connection scheduling algorithm is for
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destination IP load balancing. It is usually used in cache cluster.
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This algorithm usually directs packet destined for an IP address to
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its server if the server is alive and under load. If the server is
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overloaded (its active connection numbers is larger than its weight)
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and there is a server in its half load, then allocate the weighted
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least-connection server to this IP address.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_LBLCR
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tristate "locality-based least-connection with replication scheduling"
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---help---
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The locality-based least-connection with replication scheduling
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algorithm is also for destination IP load balancing. It is
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usually used in cache cluster. It differs from the LBLC scheduling
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as follows: the load balancer maintains mappings from a target
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to a set of server nodes that can serve the target. Requests for
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a target are assigned to the least-connection node in the target's
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server set. If all the node in the server set are over loaded,
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it picks up a least-connection node in the cluster and adds it
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in the sever set for the target. If the server set has not been
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modified for the specified time, the most loaded node is removed
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from the server set, in order to avoid high degree of replication.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_DH
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tristate "destination hashing scheduling"
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---help---
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The destination hashing scheduling algorithm assigns network
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connections to the servers through looking up a statically assigned
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hash table by their destination IP addresses.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_SH
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tristate "source hashing scheduling"
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---help---
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The source hashing scheduling algorithm assigns network
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connections to the servers through looking up a statically assigned
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hash table by their source IP addresses.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_SED
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tristate "shortest expected delay scheduling"
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---help---
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The shortest expected delay scheduling algorithm assigns network
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connections to the server with the shortest expected delay. The
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expected delay that the job will experience is (Ci + 1) / Ui if
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sent to the ith server, in which Ci is the number of connections
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on the ith server and Ui is the fixed service rate (weight)
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of the ith server.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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config IP_VS_NQ
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tristate "never queue scheduling"
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---help---
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The never queue scheduling algorithm adopts a two-speed model.
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When there is an idle server available, the job will be sent to
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the idle server, instead of waiting for a fast one. When there
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is no idle server available, the job will be sent to the server
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that minimize its expected delay (The Shortest Expected Delay
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scheduling algorithm).
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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comment 'IPVS application helper'
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config IP_VS_FTP
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tristate "FTP protocol helper"
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depends on IP_VS_PROTO_TCP
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---help---
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FTP is a protocol that transfers IP address and/or port number in
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the payload. In the virtual server via Network Address Translation,
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the IP address and port number of real servers cannot be sent to
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clients in ftp connections directly, so FTP protocol helper is
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required for tracking the connection and mangling it back to that of
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virtual service.
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If you want to compile it in kernel, say Y. To compile it as a
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module, choose M here. If unsure, say N.
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endif # IP_VS
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