lvs 高并发，编译内核参数

请保证/root可用空间在10G以上。

1）获取kernel.src.rpm

lftp ftp.redhat.com:/pub/redhat/linux/enterprise/6Server/en/os/SRPMS

get kernel-2.6.32-504.3.3.el6.src.rpm   

2）安装依赖包

yum install elfutils-devel elfutils-libelf-devel asciidoc xmlto redhat-rpm-config patchutils binutils-devel \

newt-devel audit-libs-devel bison flex hmaccalc perl perl-devel perl-ExtUtils-Embed rpm-build -y

3）编译kernel

groupadd mockbuild

useradd -g mockbuild mockbuild

rpm -ivh kernel-2.6.32-504.3.3.el6.src.rpm

编辑/root/rpmbuild/SOURCES/config-generic

修改 CONFIG_IP_VS_TAB_BITS=12 (2的12次方，4096)为 CONFIG_IP_VS_TAB_BITS=20 

cd /root/rpmbuild/SPECS/

rpmbuild -bb --target=`uname -m` kernel.spec

出现：

-------------------------------

+ gpg --homedir . --batch --gen-key /root/rpmbuild/SOURCES/genkey

gpg: WARNING: unsafe permissions on homedir `.'

gpg: keyring `./secring.gpg' created

gpg: keyring `./pubring.gpg' created

gpg: WARNING: some OpenPGP programs can't handle a DSA key with this digest size

或出现：

gpg: WARNING: unsafe permissions on homedir `.'

经过漫长的等待...

rpm -Uvh 吧

reboot 后，再 ipvsadm -ln 就可以看到效果了！

# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=1048576)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

linux_redhat源码的路径:

http://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/

参考：

http://www.360doc.com/content/14/0726/00/11962419_397102114.shtml

http://www.linuxidc.com/Linux/2012-07/64265.htm