erl node启动方法

sunjiangang-ok

<span class="Apple-style-span" style="font-family: Tahoma; line-height: 25px; -webkit-border-horizontal-spacing: 1px; -webkit-border-vertical-spacing: 1px; "><div class="section"><font class="Apple-style-span" color="#006699" size="3"><u>转载地址：</u></font><span class="Apple-style-span" style="font-size: 14px; line-height: 25px; font-weight: normal; "><a href="http://www.iteye.com/topic/321933" target="_blank" target="_blank">http://www.iteye.com/topic/321933</a></span><a name="erl-node" id="erl-node" style="color: rgb(0, 102, 153); text-decoration: underline; ">erl node启动方法</a><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><strong style="font-weight: bold; ">short name:</strong></p><ul class="simple" style="margin-top: 0px; margin-right: 0px; margin-bottom: 1.5em; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><li style="margin-top: 0px; margin-right: 0px; margin-bottom: 0.25em; margin-left: 30px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">erl -sname Name</li><li style="margin-top: 0px; margin-right: 0px; margin-bottom: 0.25em; margin-left: 30px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">erl -sname&nbsp;<a href="mailto:Name@ShortHost" class="reference" style="color: rgb(0, 102, 153); text-decoration: underline; " target="_blank" target="_blank">Name@ShortHost</a></li></ul><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><strong style="font-weight: bold; ">longname：</strong></p><ul class="simple" style="margin-top: 0px; margin-right: 0px; margin-bottom: 1.5em; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><li style="margin-top: 0px; margin-right: 0px; margin-bottom: 0.25em; margin-left: 30px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">erl -name Name</li><li style="margin-top: 0px; margin-right: 0px; margin-bottom: 0.25em; margin-left: 30px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">erl -name&nbsp;<a href="mailto:Name@ShortHost" class="reference" style="color: rgb(0, 102, 153); text-decoration: underline; " target="_blank" target="_blank">Name@ShortHost</a></li><li style="margin-top: 0px; margin-right: 0px; margin-bottom: 0.25em; margin-left: 30px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">erl -name&nbsp;<a href="mailto:Name@FullHost" class="reference" style="color: rgb(0, 102, 153); text-decoration: underline; " target="_blank" target="_blank">Name@FullHost</a></li></ul><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">说明:</p>Name :: atom() || string()
ShortHost :: atom() || string(), 不可含有"."。比如"myhost"
FullHost :: [ShortHost()] || Ip, 比如"test.mydomain.com"和"8.34.135.3"
<p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">short name 和 long name主要为格式上的区别，long name中Host如果为域名，需要进行DNS解析。</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">我们也可以在hosts中添加类似:</p>ip ShotHost
<p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">的Entry使shortname name节点支持其他主机（请参考后面介绍）</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">&nbsp;</p><div class="note"><p class="first admonition-title" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">Note</p><p class="last" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">注意，shot name的节点和long name的节点不能互相通信。</p></div></div><div class="section"><a name="id1" id="id1" style="color: rgb(0, 102, 153); text-decoration: underline; ">示例</a><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">short name:</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">假设本机/etc/hosts配置为：8.27.86.135 da6600.fb.joyent.us</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="pre">erl</span>&nbsp;<span class="pre">-sname</span>&nbsp;<span class="pre">cheng</span>&nbsp;% 启动了一个名叫:<a href="mailto:cheng@da6600" class="reference" style="color: rgb(0, 102, 153); text-decoration: underline; " target="_blank" target="_blank">cheng@da6600</a>&nbsp;的Node</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="pre">erl</span>&nbsp;<span class="pre">-name</span>&nbsp;<span class="pre">cheng</span>&nbsp;% 启动了一个名叫:<a href="mailto:cheng@da6600.fb.joyent.us" class="reference" style="color: rgb(0, 102, 153); text-decoration: underline; " target="_blank" target="_blank">cheng@da6600.fb.joyent.us</a>&nbsp;的Node</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">如果我们的本机hosts配置中，没有指定域名，那么需要我们指定Host:</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="pre">erl</span>&nbsp;<span class="pre">-sname</span>&nbsp;<span class="pre">cheng@da6600</span>&nbsp;% 启动了一个名叫：cheng@da6600的Node</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">&nbsp;</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">long name:</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="pre">erl</span>&nbsp;<span class="pre">-name</span>&nbsp;<span class="pre">cheng@da6600</span></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="pre">erl</span>&nbsp;<span class="pre">-name</span>&nbsp;<span class="pre">cheng@da6600.fb.joyent.us</span></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><span class="pre">erl</span>&nbsp;<span class="pre">-name</span>&nbsp;<span class="pre">cheng@8.27.86.135</span></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">请注意，此3个longname Node是同一个Node</p></div><div class="section"><a name="id2" id="id2" style="color: rgb(0, 102, 153); text-decoration: underline; ">应用</a><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">很多资料中，当进行分布式程序开发时，需要经历下面的步骤</p><ol class="arabic simple" style="font-size: 1em; line-height: 1.4em; margin-top: 0px; margin-right: 0px; margin-bottom: 1.5em; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><li style="font-size: 1em; margin-top: 0px; margin-right: 0px; margin-bottom: 0.25em; margin-left: 30px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">本机单个节点进行测试，</li><li style="font-size: 1em; margin-top: 0px; margin-right: 0px; margin-bottom: 0.25em; margin-left: 30px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">本机多个节点进行测试，</li><li style="font-size: 1em; margin-top: 0px; margin-right: 0px; margin-bottom: 0.25em; margin-left: 30px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">多台主机进行接近真实环境的测试</li></ol><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">其中第2步，常常是使用&nbsp;<span class="pre">erl</span>&nbsp;<span class="pre">-sname</span>&nbsp;<span class="pre">Name</span>&nbsp;类似的方法，产生Node， 因此我们印象中，好像sname只能是在本机的情况下使用？</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">通常情况下，shortname是限于本机的多个节点，longname可以跨越多台主机（通过IP，DNS解析）。</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">当然我们也可以像使用long name Node一样，使用short name Node。不同的是long name可以通过DNS进行解析， 而short name必须手动的在hosts中添加对应的映射。这样做的目的就是将本地的请求转发到目标的主机。</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">好了让我们使用short name来试验一下</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><strong style="font-weight: bold; ">server1(ip:8.27.86.135)</strong></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">启动node:</p>erl -sname foo@server1
<p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; "><strong style="font-weight: bold; ">server2（server2也可以在内网当中，此时链接只能由server2发起）</strong></p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">/etc/hosts中添加:</p>8.27.86.135 server1
<p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">随后启动node:</p>erl -sname bar

&gt; net_kernel:connect_node('foo@server1').
true
&gt; nodes().
&gt; [foo@server1]
<p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">这样，两个节点就已经链接了。</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">同理，我们也可以在server1中添加一个条目，为server2其一个ShortName，随后连接它。</p><p style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; padding-top: 0px; padding-right: 0px; padding-bottom: 0px; padding-left: 0px; ">到此，对于short name， long name的使用应该比较清晰了。</p></div></span>