Determining fastest mirrors Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock error was 12: Timeout on http://mirrorlist.centos.org/?release=7&arch=x86_64&repo=os&infra=stock: (28, 'Resolving timed out after 30580 milliseconds') One of the configured repositories failed (未知), 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

这个错误表明您的系统无法连接到CentOS的镜像源。您可以尝试以下解决方法来解决这个问题：

1. 检查您的网络连接是否正常，尝试使用ping命令测试您的网络连接。
2. 检查您的系统DNS配置是否正确，可以尝试使用nslookup命令测试DNS解析是否正常。
3. 检查您的防火墙设置，确保防火墙没有阻止yum连接到镜像源。
4. 尝试使用备用镜像源，可以通过编辑CentOS的yum源配置文件，将默认的镜像源更改为其他可用的镜像源来解决问题。
5. 如果您使用的是代理，请确保代理设置正确并且不会阻止yum连接到镜像源。

希望这些解决方法可以帮助您解决问题。

相关问题

Loaded plugins: fastestmirror, refresh-packagekit, security Determining fastest mirrors YumRepo Error: All mirror URLs are not using ftp, http[s] or file. Eg. Invalid release/repo/arch combination/ removing mirrorlist with no valid mirrors: /var/cache/yum/i386/6/base/mirrorlist.txt Error: Cannot find a valid baseurl for repo: base

这个错误通常是由于您的系统无法连接到软件源导致的。建议您检查您的网络连接是否正常，并确保您的系统可以访问正确的软件源。

您可以尝试清除缓存并重新更新软件源：

sudo yum clean all
sudo yum update

如果问题仍然存在，您可以尝试更改软件源。您可以编辑`/etc/yum.repos.d/CentOS-Base.repo`文件，并将`baseurl`字段更改为可用的软件源。

Determining the location of the ModelSim executable... Using: D:/quartus/modelsim_ase/win32aloem To specify a ModelSim executable directory, select: Tools -> Options -> EDA Tool Options Note: if both ModelSim-Altera and ModelSim executables are available, ModelSim-Altera will be used. **** Generating the ModelSim Testbench **** quartus_eda --gen_testbench --check_outputs=on --tool=modelsim_oem --format=verilog DHT11 -c DHT11 --vector_source=D:/Desktop/DHT11/Waveform.vwf --testbench_file=D:/Desktop/DHT11/simulation/qsim/Waveform.vwf.vt是什么意思

这是一个 Quartus Prime 软件运行时的输出信息。它正在生成 ModelSim 的测试台。其中 D:/quartus/modelsim_ase/win32aloem 是 ModelSim 的可执行文件路径，--gen_testbench 表示生成测试台，--check_outputs=on 表示检查输出，--tool=modelsim_oem 表示使用 ModelSim OEM 版本，--format=verilog 表示使用 Verilog 格式，DHT11 是要生成测试台的设计文件名，-c DHT11 表示使用默认的时钟周期，--vector_source=D:/Desktop/DHT11/Waveform.vwf 表示指定波形文件路径，--testbench_file=D:/Desktop/DHT11/simulation/qsim/Waveform.vwf.vt 表示指定测试台文件路径。