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centos/rhel 5和6的一点区别

1.安装时，rehl5一般都是在定制完系统后才开始格式化盘，安装相关的包，而rhel6则格式化完硬盘才开始定制系统。 2.rhel6修改ifcfg-eth0文件，保存后网络会马上生效，而不会像以前版本修改后改变需要重启网络 3.centos6.2开始网卡ifcfg-eth0改成ifcfg-em1 4./etc/inittab 文件里相关设定分成了小文件

System initialization is started by /etc/init/rcS.conf

#

Individual runlevels are started by /etc/init/rc.conf

#

Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf

#

Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf,

with configuration in /etc/sysconfig/init.

5./etc/modprobe.conf不再存在,而是分成/etc/modprobe.d/ 下小文件 6.在RHEL 5.5中系统硬盘在分完区后可以直接使用partprobe更新分区，使内核识别分区。 在RHEL6中分区完毕后使用partprobe无法更新分区，必须重新启动服务器后，分区才可以被正常挂载。 2012-4-10更新 7.mailx由8.1 6/6/93升级成Heirloom Mail version 12.4 7/29/08

=============2012-5-11更新 内核ip_conntrack参数改成,nf_conntrack 在/etc/sysctl.conf中使用老的参数,再用sysctl -p生效会报错

error: “net.ipv4.netfilter.ip_conntrack_max” is an unknown key error: “net.ipv4.netfilter.ip_conntrack_tcp_timeout_established” is an unknown key

改为

net.nf_conntrack_max = 655360 net.netfilter.nf_conntrack_tcp_timeout_established = 36000

参考:http://www.myfreelinux.com/?p=743&cpage=2&replytocom=223803

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By C1G – 2012/03/30

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