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2.2.4. 使​​​用​​​服​​​务​​​器​​​故​​​障​​​切​​​换​​​

从​​​ up2date-4.2.38 开​​​始​​​,可​​​将​​​ Red Hat Update Agent 配​​​置​​​为​​​从​​​一​​​系​​​列​​​ RHN 服​​​务​​​器​​​中​​​查​​​找​​​更​​​新​​​。​​​当​​​您​​​需​​​要​​​马​​​上​​​进​​​行​​​更​​​新​​​而​​​您​​​的​​​主​​​ RHN Proxy Server 或​​​ RHN Satellite Server 却​​​不​​​在​​​线​​​时​​​,这​​​个​​​功​​​能​​​就​​​非​​​常​​​有​​​用​​​。​​​
要​​​使​​​用​​​这​​​个​​​功​​​能​​​,请​​​首​​​先​​​确​​​认​​​您​​​运​​​行​​​了​​​所​​​需​​​的​​​ up2date 版​​​本​​​。​​​然​​​后​​​,手​​​动​​​将​​​从​​​服​​​务​​​器​​​加​​​入​​​到​​​(以​​​ root 身​​​份​​​)/etc/sysconfig/rhn/up2date 的​​​ serverURL 和​​​ noSSLServerURL 设​​​置​​​中​​​。​​​在​​​主​​​服​​​务​​​器​​​的​​​后​​​面​​​加​​​入​​​从​​​代​​​理​​​服​​​务​​​器​​​或​​​ Satellite 服​​​务​​​器​​​的​​​ FQDN,服​​​务​​​器​​​间​​​以​​​分​​​号​​​(;)分​​​隔​​​。​​​例​​​如​​​:
serverURL[comment]=Remote server URL
serverURL=https://your_primary.your_domain.com/XMLRPC; 
https://your_secondary.your_domain.com/XMLRPC;

noSSLServerURL[comment]=Remote server URL without SSL
noSSLServerURL=http://your_primary.your_domain.com/XMLRPC; 
https://your_secondary.your_domain.com/XMLRPC;
根​​​据​​​在​​​此​​​提​​​供​​​的​​​顺​​​序​​​尝​​​试​​​连​​​接​​​到​​​服​​​务​​​器​​​。​​​您​​​可​​​以​​​将​​​您​​​所​​​需​​​要​​​的​​​所​​​有​​​服​​​务​​​器​​​都​​​包​​​括​​​在​​​内​​​。​​​您​​​可​​​能​​​还​​​希​​​望​​​列​​​出​​​中​​​央​​​ RHN 服​​​务​​​器​​​。​​​这​​​只​​​有​​​在​​​客​​​户​​​端​​​系​​​统​​​可​​​以​​​与​​​互​​​联​​​网​​​连​​​接​​​的​​​时​​​候​​​才​​​有​​​意​​​义​​​。​​​