yum install Execution Timeout When a Proxy Is Required for Internet Connection

Symptom

When the server cannot be directly connected to the Internet and is connected to the Internet through a proxy, the yum install command execution times out.

Key Process and Cause Analysis

The proxy is configured using the export http_proxy=xxx command. However, Yum cannot identify the proxy.

Conclusion and Solution

1. Add the proxy field to the /etc/yum.conf file.

   [main]
   cachedir=/var/cache/yum/$basearch/$releasever
   keepcache=0
   debuglevel=2
   logfile=/var/log/yum.log
   exactarch=1
   obsoletes=1
   gpgcheck=1
   plugins=1
   installonly_limit=5
   bugtracker_url=http://bugs.centos.org/set_project.php?project_id=23&ref=http://bugs.centos.org/bug_report_page.php?category=yum
   distroverpkg=centos-release
   sslverify=false
   http_proxy=http://127.0.0.1:3128
   HTTP_PROXY=http://127.0.0.1:3128
   https_proxy=http://127.0.0.1:3128
   HTTPS_PROXY=http://127.0.0.1:3128
   ftp_proxy=http://127.0.0.1:3128
   proxy=http://127.0.0.1:3128

   In the preceding example, 127.0.0.1 and 3128 indicate the IP address and port number of the proxy host. Replace them with the actual ones.

2. Run the yum install command again.