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
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