三、出现的一些问题

3.1 问题一 [root ~]# yum -y install gcc

Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was

14: curl#6 - "Could not resolve host: mirrorlist.centos.org;

 

 One of the configured repositories failed

 and yum doesn't have enough cached data to continue. At this point the only  safe thing yum can do is fail. There are a few ways to work "fix" this:

     1. Contact the upstream for the repository and get them to fix the problem.

     2. Reconfigure the baseurl/etc. for the repository, to point to a working

        upstream. This is most often useful if you are using a newer         distribution release than is supported by the repository (and the         packages for the previous distribution release still work).

     3. Run the command with the repository temporarily disabled

            yum --disablerepo=<repoid> ...

     4. Disable the repository permanently, so yum won't use it by default. Yum

        will then just ignore the repository until you permanently enable it         again or use --enablerepo for temporary usage:

            yum-config-manager --disable <repoid>

        or             subscription-manager repos --disable=<repoid>

     5. Configure the failing repository to be skipped, if it is unavailable.

        Note that yum will try to contact the repo. when it runs most commands,         so will have to try and fail each time (and thus. yum will be be much         slower). If it is a very temporary problem though, this is often a nice         compromise:

            yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=true

Cannot find a valid baseurl for repo: base/7/x86_64

 问题一解决办法

“cat /etc/resolv.conf”文件中增加“nameserver 114.114.114.114”解决。

3.2 问题2  配置ip地址

centos7使用了新的命令ip命令

# vim /etc/sysconfig/network-scripts/ifcfg-eth2s0f0

修改以下内容

1. BOOTPROTO="static" #dhcp改为static，也可以注销此项  
2. ONBOOT="yes" #开机启用本配置  
3. IPADDR=192.168.7.106 #静态IP  
4. GATEWAY=192.168.7.1 #默认网关  
5. NETMASK=255.255.255.0 #子网掩码  

重启网络服务

# service network restart  

查看改动后的效果，Centois 7 不再使用 ifconfig 而是用 ip 命令查看网络信息。

1. # ip addr  
2. 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN   
3.     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00  
4.     inet 127.0.0.1/8 scope host lo  
5.        valid_lft forever preferred_lft forever  
6.     inet6 ::1/128 scope host   
7.        valid_lft forever preferred_lft forever  
8. 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000  
9.     link/ether 00:15:5d:07:f1:02 brd ff:ff:ff:ff:ff:ff  
10.     inet 192.168.7.106/24 brd 192.168.7.255 scope global eth0  
11.        valid_lft forever preferred_lft forever  
12.     inet6 fe80::215:5dff:fe07:f102/64 scope link   
13.        valid_lft forever preferred_lft forever  

3.3 

问题三

[root ~]# ip route |column -t

default           via  172.17.250.1  dev    enp2s0f0  proto  static  metric  100 default           via  192.169.16.1  dev    enp2s0f1  proto  static  metric  101 172.17.250.0/24   dev  enp2s0f0      proto  kernel    scope  link    src     172.17.250.60   metric  100 192.168.0.0/24    via  192.169.16.1  dev    enp2s0f1  proto  static  metric  100 192.168.122.0/24  dev  virbr0        proto  kernel    scope  link    src     192.168.122.1 192.169.0.0/24    via  192.169.16.1  dev    enp2s0f1  proto  static  metric  100 192.169.16.0/24   dev  enp2s0f1      proto  kernel    scope  link    src     192.169.16.251  metric  100

添加如下网段到网关

[root ~]# route add -net 192.168.0.0 netmask 255.255.0.0 gw 192.169.16.1

[root ~]# route add -net 192.169.0.0 netmask 255.255.0.0 gw 192.169.16.1

固定网段到网关

 

[root ~]# vi /etc/sysconfig/network-scripts/route-enp2s0f1

192.168.0.0/24 via 192.169.16.1 dev enp2s0f1

192.169.0.0/24 via 192.169.16.1 dev enp2s0f1 192.168.0.0/16 via 192.169.16.1 dev enp2s0f1 192.169.0.0/16 via 192.169.16.1 dev enp2s0f1

保存退出