centos7的安装过程中出现的问题（二）

三、出现的一些问题

3.1 问题一 [root@gansu ~]# 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@gansu ~]# 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@gansu ~]# route add -net 192.168.0.0 netmask 255.255.0.0 gw 192.169.16.1 [root@gansu ~]# 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@gansu ~]# 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