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一、总结在使用Linux时遇到的各种坑

• yum 源要替换为国内源
• wget 需要用yum先行下载
• 在make的时候需要预先安装各种库
• 端口无法访问时要记得去防火墙开启端口访问权限
• 安装完各种程序的时候记得创建环境变量或者软链接
• …

二、遇到故障如何正确高效的去解决

• 在使用yum下载wget的时候报错：

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; 未知的错误"One of the configured repositories failed (未知),and yum doesn't have enough cached data to continue. At this point the onlysafe 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 workingupstream. This is most often useful if you are using a newerdistribution release than is supported by the repository (and thepackages for the previous distribution release still work).3. Disable the repository, so yum won't use it by default. Yum will thenjust ignore the repository until you permanently enable it again or use--enablerepo for temporary usage:yum-config-manager --disable <repoid>4. 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 muchslower). If it is a very temporary problem though, this is often a nicecompromise:yum-config-manager --save --setopt=<repoid>.skip_if_unavailable=trueCannot find a valid baseurl for repo: base/7/x86_64

快速抓住关键语句即Cannot find a valid baseurl for repo: base/7/x86_64并在加上简单的问题描述后Google或者baidu，期望在哪个网站得到答案则加网站关键词后缀，例如：

# CSDN
Linux yum 报错 Cannot find a valid baseurl for repo: base/7/x86_64 CSDN
# 博客园
Linux yum 报错 Cannot find a valid baseurl for repo: base/7/x86_64 cnblog
# 简书
Linux yum 报错 Cannot find a valid baseurl for repo: base/7/x86_64 jianshu
# stack overflow
Linux yum 报错 Cannot find a valid baseurl for repo: base/7/x86_64 stack overflow

检索查询结果并尝试，最后解决问题。