<div dir="ltr"><div class="gmail_default" style="font-size:small;color:rgb(51,51,153)"><ol><li>'unavailable' means the server will automatically and temporarily be removed from the pool of servers managed by the upstream (same effect as manually parametering it as <span style="font-family:monospace,monospace">down</span>)</li><li>the <span style="font-family:monospace,monospace">fail_timeout</span> parameter documentation of the very section you provided a link to is pretty clear: this value both configure the duration during which the parametered amount of failure must be recorded and the time during which the server will subsequently be unavailable<br clear="all"></li></ol></div><div class="gmail_extra"><div><div class="gmail_signature" data-smartmail="gmail_signature"><font size="1"><span style="color:rgb(102,102,102)">---<br></span><b><span style="color:rgb(102,102,102)">B. R.</span></b><span style="color:rgb(102,102,102)"></span></font></div></div>
<br><div class="gmail_quote">On Wed, Jun 21, 2017 at 3:54 PM, linbo liao <span dir="ltr"><<a href="mailto:llbgurs@gmail.com" target="_blank">llbgurs@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Hi,<br><br></div>Refer to <a href="http://nginx.org/en/docs/http/ngx_http_upstream_module.html#server" target="_blank">http://nginx.org/en/docs/http/<wbr>ngx_http_upstream_module.html#<wbr>server </a>, if all primary server are unavailable, backup server will handle request.<br><br></div><div>I have two question?<br></div><div>1. What's the meaning of unavailable?<br></div><div>2. When will primary server come back, after <code>fail_timeout?<br><br></code></div><div><code>Thanks,<br></code></div><div><code>Linbo<br></code></div><div><br><br></div></div>
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