三、网络
setup工具还是保留了，但有区别，没有了网络配置，多了RHN（CentOS到底是跟RedHat一家子了）
[root@localhost ~]# setup
好吧，我们看看网络配置。
[root@localhost ~]# cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 192.168.150.254
[root@localhost ~]# cat /etc/sysconfig/network
# Created by anaconda
[root@localhost ~]# ll /etc/sysconfig/network-scripts/ifcfg-*
-rw-r--r--. 1 root root 298 Jul 9 00:13 /etc/sysconfig/network-scripts/ifcfg-Auto_Ethernet
-rw-r--r--. 1 root root 288 Jul 8 23:12 /etc/sysconfig/network-scripts/ifcfg-enp0s3
-rw-r--r--. 1 root root 254 Apr 2 23:30 /etc/sysconfig/network-scripts/ifcfg-lo
[root@localhost ~]# ifconfig
enp0s3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.150.180 netmask 255.255.255.0 broadcast 192.168.150.255
inet6 fe80::a00:27ff:fe9a:a688 prefixlen 64 scopeid 0x20<link>
ether 08:00:27:9a:a6:88 txqueuelen 1000 (Ethernet)
RX packets 39317 bytes 2487945 (2.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2216 bytes 740115 (722.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 6 bytes 504 (504.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6 bytes 504 (504.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@localhost ~]#
先改改主机名：
[root@localhost ~]# echo "hostname cenots7.localdomain" >>/etc/sysconfig/network
[root@localhost ~]# reboot
Connection to 192.168.150.180 closed by remote host.
Connection to 192.168.150.180 closed.
xw@Opt9010:~$ ssh root@192.168.150.180
root@192.168.150.180's password:
Last login: Thu Jul 10 10:01:09 2014
[root@cenots7 ~]#
看看网卡配置文件：
[root@cenots7 ~]# cd /etc/sysconfig/network-scripts/
[root@cenots7 network-scripts]# cat ifcfg-Auto_Ethernet
HWADDR=08:00:27:9A:A6:88
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME="Auto Ethernet"
UUID=76304098-8f46-4185-8337-bb7f0d90423e
ONBOOT=yes
[root@cenots7 network-scripts]# cat ifcfg-enp0s3
HWADDR=08:00:27:9A:A6:88
TYPE=Ethernet
BOOTPROTO=dhcp
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes
IPV6_FAILURE_FATAL=no
NAME=enp0s3
UUID=66a635c2-9600-437b-8cfb-57e9569f68da
ONBOOT=no
看看两个文件有啥不同：
[root@cenots7 network-scripts]# diff ifcfg-Auto_Ethernet ifcfg-enp0s3
14,16c14,16
<
< UUID=76304098-8f46-4185-8337-bb7f0d90423e
< ONBOOT=yes
---
> NAME=enp0s3
> UUID=66a635c2-9600-437b-8cfb-57e9569f68da
> ONBOOT=no
两个文件MAC地址一样，ifcfg-Auto_Ethernet ONBOOT=yes，但是ifconfig结果显示的是enp0s3，有点儿费解了。
再看看我复制KVM虚拟机时经常要改的网卡MAC地址：
root@cenots7 network-scripts]# ll /etc/udev/rules.d/
total 8
-rw-r--r--. 1 root root 134 Jul 9 00:47 60-vboxadd.rules
-rw-r--r--. 1 root root 352 Jul 4 00:38 98-kexec.rules
[root@cenots7 network-scripts]# cat /etc/udev/rules.d/98-kexec.rules
SUBSYSTEM=="cpu", ACTION=="online", PROGRAM="/bin/systemctl try-restart kdump.service"
SUBSYSTEM=="cpu", ACTION=="offline", PROGRAM="/bin/systemctl try-restart kdump.service"
SUBSYSTEM=="memory", ACTION=="add", PROGRAM="/bin/systemctl try-restart kdump.service"
SUBSYSTEM=="memory", ACTION=="remove", PROGRAM="/bin/systemctl try-restart kdump.service"
[root@cenots7 network-scripts]# cat /etc/udev/rules.d/60-vboxadd.rules
KERNEL=="vboxguest",, OWNER="vboxadd", MODE="0660"
KERNEL=="vboxuser",, OWNER="vboxadd", MODE="0666"
70-persistent-net.rules呢？
网卡MAC只在网卡配置文件里有，一旦变了我只需要改网卡配置文件？
[root@cenots7 network-scripts]# grep -r "08:00:27:9A:A6:88" /etc/
/etc/sysconfig/network-scripts/ifcfg-enp0s3:HWADDR=08:00:27:9A:A6:88
/etc/sysconfig/network-scripts/ifcfg-Auto_Ethernet:HWADDR=08:00:27:9A:A6:88
改一下网卡MAC 0800279AA688 -> 0800278C3746
改MAC后网卡不认了，测试结果是只需要改网卡配置文件的MAC，而且两个配置文件都要改才行。我顺便把DHCP改成了固定IP。
[root@cenots7 ~]# cat /etc/sysconfig/network-scripts/ifcfg-Auto_Ethernet
HWADDR=08:00:27:8C:37:46
# HWADDR=08:00:27:9A:A6:88
TYPE=Ethernet
BOOTPROTO=static
IPADDR=192.168.150.180
NETMASK=255.255.255.0
GATEWAY=192.168.150.254
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
IPV6_AUTOCONF=no
IPV6_DEFROUTE=no
IPV6_PEERDNS=no
IPV6_PEERROUTES=no
IPV6_FAILURE_FATAL=no
NAME="Auto Ethernet"
UUID=76304098-8f46-4185-8337-bb7f0d90423e
ONBOOT=yes
[root@cenots7 ~]# cat /etc/sysconfig/network-scripts/ifcfg-enp0s3
HWADDR=08:00:27:8C:37:46
# HWADDR=08:00:27:9A:A6:88
TYPE=Ethernet
BOOTPROTO=static
IPADDR=192.168.150.180
NETMASK=255.255.255.0
GATEWAY=192.168.150.254
DEFROUTE=yes
PEERDNS=yes
PEERROUTES=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=no
IPV6_AUTOCONF=no
IPV6_DEFROUTE=no
IPV6_PEERDNS=no
IPV6_PEERROUTES=no
IPV6_FAILURE_FATAL=no
NAME=enp0s3
UUID=66a635c2-9600-437b-8cfb-57e9569f68da
ONBOOT=no
好吧，这样初步解决了基础问题。