红帽全球峰会C.4. 查看 cid
和服务器一样，每个频道也会有自己的 ID。有些方法（包括
set_base_channel 和 set_child_channels）会需要这个参数值（cid）。也和 sid 一样，cid 可以通过 RHN 网站得到。点击频道名后查看 URL 的结尾部分。它会跟在 "=" 符号后面："ChannelDetail.do?cid=54"。
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