Check the available of yum in Linux

本文介绍了如何更新yum源文件并检查其可用性,通过运行命令同步存储库。此外还详细说明了如何在Red Hat、CentOS等系统中设置代理,确保通过SSH隧道使用yum,适用于需要配置网络代理的企业环境。

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(1) Update the files under /etc/yum.repos.d , check whether it is available.

 

(2) And then run command "#yum repolist all" to sync the repo.


(3) Check the proxy and dns server in the system.



To enable yum to use the SSH tunnel, need to edit the file/etc/yum.conf, and add in the line “proxy=http://<IPaddr:port number>”.

 

To enable proxy on Redhat Linux, need to edit the file/etc/rhsm/rhsm.conf, and add these two rows “proxy_hostname = <IPaddr>”and “proxy_port = <port number>”. Or add the row“proxy=http://<IPaddr:port number>”.

 

To enable proxy on CentOS, add the following lines to your/etc/environment file:

http_proxy="http://<IPaddr:portnumber>/"

https_proxy="https://<IPaddr:portnumber>/"

ftp_proxy="ftp://<IPaddr:portnumber>/"

no_proxy=".mylan.local,.domain1.com,host1,host2"

 

To apply these settings without restarting the machine run thefollowing commands,

export http_proxy="http://<IPaddr:port number>/"

export https_proxy="https://<IPaddr:port number>/"

export ftp_proxy="ftp://<IPaddr:portnumber>/"

exportno_proxy=".mylan.local,.domain1.com,host1,host2"


### YUM Command Usage and Troubleshooting #### Understanding the Basics of YUM YUM (Yellowdog Updater Modified) serves as an interactive and automated update program for RPM-based systems like Red Hat Enterprise Linux, CentOS, Fedora, etc. This utility can be employed not only to maintain single installations but also manage server farms with thousands of computers. For daily operations, users often interact with `yum` through simple commands such as installing (`install`), updating (`update`), removing (`remove`) packages or groups of software, searching package databases (`search`), listing installed packages on your system (`list`), checking which updates are available (`check-update`), among others[^1]. #### Common Issues and Solutions Related to YUM Configuration Files When encountering issues related to YUM's configuration file format or path errors, it is crucial to inspect `/etc/yum.repos.d/*.repo`. These files define repositories from where you download packages. Errors within these configurations may prevent successful installation or updates due to malformed entries that do not conform to expected syntax rules specified by YUM. To resolve this issue: - Verify each line inside `.repo` files adheres strictly to key=value pairs without any extraneous characters. - Ensure all repository URLs point correctly towards valid sources accessible over network connections. - Remove duplicate definitions pointing at identical locations under different names since they might cause conflicts during synchronization processes. #### Using Man Pages Effectively The `man` command plays a pivotal role in providing access to extensive manuals covering almost every aspect concerning Linux distributions including those associated specifically with tools similar to YUM[^2]. By invoking `man yum`, one gains insight into official guidelines regarding proper utilization alongside advanced options less commonly known yet potentially beneficial depending upon specific administrative needs. ```bash $ man yum ``` This invocation opens up comprehensive documentation directly within terminal interfaces allowing administrators to browse sections pertinent to their current tasks efficiently while ensuring accuracy when executing subsequent actions based off acquired knowledge presented therein. --related questions-- 1. How does one verify the integrity of existing .repo files? 2. What steps should be taken before adding new custom repositories using YUM? 3. Can you provide examples demonstrating how to use some lesser-known flags supported by YUM? 4. In what scenarios would consulting MAN pages prove more advantageous compared against online resources?
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