编辑 我尝试安装 cgynus-ngsi 首先安装现成的图像并测试它是否正常工作， 但是当我尝试重新配置 agent.conf 时我编辑文件并尝试从头开始安装cgynus-ngsi它发现了这个问题 尝试其他镜子。
Setting up Install Process
http://ftp.uma.es/mirror/CentOS/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://ftp.uma.es/mirror/CentOS/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
http://sunsite.rediris.es/mirror/CentOS/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://sunsite.rediris.es/mirror/CentOS/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
http://mirror.trueinter.net/centos/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.trueinter.net/centos/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
http://mirror.uv.es/mirror/CentOS/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.uv.es/mirror/CentOS/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
http://ftp.cica.es/CentOS/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://ftp.cica.es/CentOS/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
http://mirror.tedra.es/CentOS/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.tedra.es/CentOS/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
http://centos.uvigo.es/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://centos.uvigo.es/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
http://mirror.airenetworks.es/CentOS/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://mirror.airenetworks.es/CentOS/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
http://centos.cadt.com/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on http://centos.cadt.com/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
ftp://ftp.cesca.cat/centos/6.9/os/x86_64/repodata/repomd.xml: [Errno 12] Timeout on ftp://ftp.cesca.cat/centos/6.9/os/x86_64/repodata/repomd.xml: (28, 'Operation too slow. Less than 1 bytes/sec transfered the last 30 seconds')
Trying other mirror.
Error: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again
/bin/sh: java: command not found
然后
我运行了同志 docker build -t cygnus-common 。 它git这个日志
INFO: Java version <1.7.0>
INFO: Apache domain <http://archive.apache.org/dist/>
INFO: URL MAVEN <http://archive.apache.org/dist/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz>
INFO: URL FLUME <http://archive.apache.org/dist/flume/1.4.0/apache-flume-1.4.0-bin.tar.gz>
INFO: Download and install Maven and Flume...
但是超时
答案 0 :(得分：1)
这似乎是一个网络问题。你的主人是否代理？
您可以尝试从this question on ServerFault中所述的同一主机手动访问镜像，看看会发生什么：
time wget http://sunsite.rediris.es/mirror/CentOS/6.9/os/x86_64/repodata/repomd.xml
如果您也遇到问题，也许您必须与云提供商取得联系。
如果您在CentOS中运行，如in this link from CentOS forum所述，您可以将http_caching=packages添加到/etc/yum.conf文件并再次运行该命令。
请阅读上面的链接了解更多详情。