vmware安装Oracle Linux 6.5，使用DHCP，每次重启时会自动修改/etc/resolv.conf文件中的nameserver项。

观察到设置nameserver项会导致该服务器上安装的oacle lsnrctl和tnsping等响应缓慢，同时ssh也变得很慢，必须将nameservers项注释掉。但每次重启服务器该文件都会被修改，nameserver被重新设置。

避免这种情况的方法之一：

Modify your interface configuration file such as /etc/sysconfig/network-scripts/ifcfg-eth0 file and append any one of the following option:

# do not overwrite /etc/resolv.conf ##
PEERDNS=no
OR

## use the following nameservers in /etc/resolv.conf ##
PEERDNS=no
DNS1=8.8.8.8
DNS2=1.2.3.4
Save and close the file. Where,

PEERDNS=yes|no - Modify /etc/resolv.conf if peer uses msdns extension (PPP only) or DNS{1,2} are set, or if using dhclient. default to "yes".
DNS{1,2}= - Provide DNS addresses that are dropped into the resolv.conf file if PEERDNS is not set to "no".

问题解决，进图形化界面看了一下，实际上就是把网卡设置改为了DHCP address only

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[Linux]Vmware Oracle Linux6.5 避免网卡DHCP设置每次重启时自动修改/etc/resolv.conf

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