blocks|key|364443|text|尝试：Request.remote_ip|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|364444|364445|+remote_ip()|blockquote|364446|364447|确定源IP地址。REMOTE_ADDR是标准的，但如果用户在代理后面，则会失败。HTTP_CLIENT_IP和/或HTTP_X_FORWARDED_FOR是由代理设置的，因此如果REMOTE_ADDR是代理，请检查它们。在多个链式代理的情况下，HTTP_X_FORWARDED_FOR可以是逗号分隔的列表；不受信任的最后一个地址是始发IP。|364448|364449|更新:哦，对不起，我读错了文档。|364450|entityMap|0|LINK|mutability|MUTABLE|url|http://apidock.com/rails/v2.3.8/ActionController/Request/remote_ip^0|3|H|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|10|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|11|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|12|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|13|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|14|8|@]|9|@]|C|$]]|$1|N|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|O|$P|$5|Q|R|S|C|$T|U]]]]

try: <a href="http://apidock.com/rails/v2.3.8/ActionController/Request/remote_ip" rel="nofollow noreferrer">Request.remote_ip</a>

<blockquote>
 remote_ip()
 
 Determine originating IP address. REMOTE_ADDR is the standard but will
 fail if the user is behind a proxy. HTTP_CLIENT_IP and/or
 HTTP_X_FORWARDED_FOR are set by proxies so check for these if
 REMOTE_ADDR is a proxy. HTTP_X_FORWARDED_FOR may be a comma- delimited
 list in the case of multiple chained proxies; the last address which
 is not trusted is the originating IP.
</blockquote>

Update:
Oops, sorry I misread the documentation.

blocks|key|364452|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|364453|host+=+`hostname`.strip+#+Get+the+hostname+from+the+shell+and+removing+trailing+\n
puts+host+++++++++++++++#+Output+the+hostname|code-block|syntax|javascript|364454|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this:

<pre><code>host = `hostname`.strip # Get the hostname from the shell and removing trailing \n
puts host # Output the hostname
</code></pre>

blocks|key|366199|text|您可能会发现自己在每台机器上都有多个IP地址(127.0.0.1、192.168.0.1等)。如果你使用*NIX作为操作系统，我建议使用hostname，然后运行DNS查找。您应该能够使用/etc/hosts来定义本地主机名，以解析为该计算机的IP地址。在Windows上也有类似的功能，但我没有用过，因为Windows95是最先进的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|366200|另一种选择是使用像WhatIsMyIp.com这样的查找服务。这些家伙会把你真实的IP地址还给你。如果您愿意，也可以在本地服务器上使用Perl脚本轻松地进行设置。我相信从%25ENV输出远程IP的3行左右的代码应该涵盖了你。|366201|entityMap|0|LINK|mutability|MUTABLE|url|http://whatismyip.com/automation/n09230945.asp^0|1W|8|0|9|E|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@$9|T|A|U|1|V]]|E|$]]|$1|H|3|-4|5|6|7|W|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

You will likely find yourself having multiple IP addresses on each machine (127.0.0.1, 192.168.0.1, etc). If you are using *NIX as your OS, I'd suggest using <code>hostname</code>, and then running a DNS look up on that. You should be able to use /etc/hosts to define the local hostname to resolve to the IP address for that machine. There is similar functionality on Windows, but I haven't used it since Windows 95 was the bleeding edge.

The other option would be to hit a lookup service like <a href="http://whatismyip.com/automation/n09230945.asp" rel="nofollow noreferrer">WhatIsMyIp.com</a>. These guys will kick back your real-world IP address to you. This is also something that you can easily setup with a Perl script on a local server if you prefer. I believe 3 lines or so of code to output the remote IP from %ENV should cover you.

blocks|key|3160796|text|来自coderrr.wordpress.com|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3160797|require+'socket'

def+local_ip
++orig,+Socket.do_not_reverse_lookup+=+Socket.do_not_reverse_lookup,+true++#+turn+off+reverse+DNS+resolution+temporarily

++UDPSocket.open+do+%7Cs%7C
++++s.connect+'64.233.187.99',+1
++++s.addr.last
++end
ensure
++Socket.do_not_reverse_lookup+=+orig
end

#+irb:0>+local_ip
#+=>+"192.168.0.127"|code-block|syntax|javascript|3160798|entityMap|0|LINK|mutability|MUTABLE|url|http://coderrr.wordpress.com/2008/05/28/get-your-local-ip-address/^0|2|L|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

From <a href="http://coderrr.wordpress.com/2008/05/28/get-your-local-ip-address/" rel="noreferrer">coderrr.wordpress.com</a>:

<pre><code>require 'socket'

def local_ip
 orig, Socket.do_not_reverse_lookup = Socket.do_not_reverse_lookup, true # turn off reverse DNS resolution temporarily

 UDPSocket.open do |s|
 s.connect '64.233.187.99', 1
 s.addr.last
 end
ensure
 Socket.do_not_reverse_lookup = orig
end

# irb:0&gt; local_ip
# =&gt; "192.168.0.127"
</code></pre>

blocks|key|3160826|text|主机名|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3160827|在Ruby中获取主机名的一个简单方法是：|3160828|require+'socket'
hostname+=+Socket.gethostname|code-block|syntax|javascript|3160829|问题是，这依赖于主机知道它自己的名称，因为它使用gethostname或uname系统调用，因此它不能解决原始问题。|CODE|3160830|在功能上，这与hostname答案相同，不需要调用外部程序。主机名可能是完全限定的，也可能不是完全限定的，具体取决于计算机的配置。|3160831|3160832|IP地址|3160833|从Ruby1.9开始，您还可以使用套接字库来获取本地地址列表。ip_address_list返回AddrInfo对象的数组。如何从其中进行选择将取决于您想要做什么以及您有多少接口，但这里有一个示例，它简单地选择第一个非环回IPV4+IP地址作为字符串：|3160834|require+'socket'
ip_address+=+Socket.ip_address_list.find+{+%7Cai%7C+ai.ipv4?+&&+!ai.ipv4_loopback?+}.ip_address|3160835|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ruby-doc.org/stdlib-1.9.3/libdoc/socket/rdoc/Socket.html#method-c-ip_address_list|1|http://www.ruby-doc.org/stdlib-1.9.3/libdoc/socket/rdoc/Addrinfo.html^0|0|3|0|0|0|O|B|10|5|0|7|8|0|0|0|4|0|V|F|V|F|0|1C|8|1|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1C|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1D|8|@$9|1E|A|1F|B|O]|$9|1G|A|1H|B|O]]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1I|8|@$9|1J|A|1K|B|O]]|D|@]|E|$]]|$1|R|3|-4|5|6|7|1L|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|U|3|V|5|6|7|1P|8|@$9|1Q|A|1R|B|O]]|D|@$9|1S|A|1T|1|1U]|$9|1V|A|1W|1|1X]]|E|$]]|$1|W|3|X|5|J|7|1Y|8|@]|D|@]|E|$K|L]]|$1|Y|3|-4|5|6|7|1Z|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]|16|$5|11|12|13|E|$14|17]]]]

Hostname

A simple way to just get the hostname in Ruby is:

<pre><code>require 'socket'
hostname = Socket.gethostname
</code></pre>

The catch is that this relies on the host knowing its own name because it uses either the <code>gethostname</code> or <code>uname</code> system call, so it will not work for the original problem. 

Functionally this is identical to the <code>hostname</code> answer, without invoking an external program. The hostname may or may not be fully qualified, depending on the machine's configuration.

<hr>

IP Address

Since ruby 1.9, you can also use the Socket library to get a list of local addresses. <a href="http://www.ruby-doc.org/stdlib-1.9.3/libdoc/socket/rdoc/Socket.html#method-c-ip_address_list" rel="noreferrer"><code>ip_address_list</code></a> returns an array of <a href="http://www.ruby-doc.org/stdlib-1.9.3/libdoc/socket/rdoc/Addrinfo.html" rel="noreferrer">AddrInfo</a> objects. How you choose from it will depend on what you want to do and how many interfaces you have, but here's an example which simply selects the first non-loopback IPV4 IP address as a string:

<pre><code>require 'socket'
ip_address = Socket.ip_address_list.find { |ai| ai.ipv4? &amp;&amp; !ai.ipv4_loopback? }.ip_address
</code></pre>

blocks|key|365909|text|将突出显示的部分放在反号中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|365910|`dig+#{request.host}+%2Bshort`.strip+#+dig+gives+a+newline+at+the+end|code-block|syntax|javascript|365911|或者，如果你不关心它是否是一个IP，就直接使用request.host。|offset|length|style|CODE|365912|entityMap^0|0|0|N|C|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Put the highlighted part in backticks:

<pre><code>`dig #{request.host} +short`.strip # dig gives a newline at the end
</code></pre>

Or just <code>request.host</code> if you don't care whether it's an IP or not.

blocks|key|366261|text|最简单的是controller.rb中的host_with_port|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|366262|host_port=+request.host_with_port|code-block|syntax|javascript|366263|entityMap|0|LINK|mutability|MUTABLE|url|http://api.rubyonrails.org/classes/ActionController/Request.html#M000521^0|K|E|K|E|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]]|D|@$9|V|A|W|1|X]]|E|$]]|$1|F|3|G|5|H|7|Y|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

Simplest is <a href="http://api.rubyonrails.org/classes/ActionController/Request.html#M000521" rel="noreferrer"><code>host_with_port</code></a> in controller.rb

<pre><code>host_port= request.host_with_port
</code></pre>

blocks|key|3373766|text|接受的答案可以工作，但您必须为每个请求创建一个套接字，如果服务器在本地网络上和/或没有连接到互联网，它就不能工作。下面的代码，我相信它会一直起作用，因为它正在解析请求头。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3373767|request.env["SERVER_ADDR"]|code-block|syntax|javascript|3373768|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The accepted answer works but you have to create a socket for every request and it does not work if the server is on a local network and/or not connected to the internet. The below, I believe will always work since it is parsing the request header.

<pre><code>request.env["SERVER_ADDR"]
</code></pre>

blocks|key|369410|text|这里使用的IP地址是Google的，但您可以使用任何可访问的IP。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|369411|require+"socket"
local_ip+=+UDPSocket.open+{%7Cs%7C+s.connect("64.233.187.99",+1);+s.addr.last}|code-block|syntax|javascript|369412|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This IP address used here is Google's, but you can use any accessible IP.

<pre><code>require "socket"
local_ip = UDPSocket.open {|s| s.connect("64.233.187.99", 1); s.addr.last}
</code></pre>

blocks|key|3161024|text|服务器通常有多个接口，至少一个私有接口和一个公共接口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3161025|因为这里的所有答案都处理这个简单的场景，所以更简洁的方法是向套接字询问当前的ip_address_list()，如下所示：|offset|length|style|CODE|3161026|require+'socket'

def+my_first_private_ipv4
++Socket.ip_address_list.detect{%7Cintf%7C+intf.ipv4_private?}
end

def+my_first_public_ipv4
++Socket.ip_address_list.detect{%7Cintf%7C+intf.ipv4?+and+!intf.ipv4_loopback?+and+!intf.ipv4_multicast?+and+!intf.ipv4_private?}
end|code-block|syntax|javascript|3161027|这两个方法都返回一个Addrinfo对象，因此如果需要字符串，可以使用ip_address()方法，如下所示：|3161028|ip=+my_first_public_ipv4.ip_address+unless+my_first_public_ipv4.nil?|3161029|通过更改用于过滤所需接口地址的Addrinfo方法，您可以轻松找到更适合您的情况的解决方案。|3161030|entityMap^0|0|12|H|0|0|Z|C|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@$D|W|E|X|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

A server typically has more than one interface, at least one private and one public.

Since all the answers here deal with this simple scenario, a cleaner way is to ask Socket for the current <code>ip_address_list()</code> as in:

<pre><code>require 'socket'

def my_first_private_ipv4
 Socket.ip_address_list.detect{|intf| intf.ipv4_private?}
end

def my_first_public_ipv4
 Socket.ip_address_list.detect{|intf| intf.ipv4? and !intf.ipv4_loopback? and !intf.ipv4_multicast? and !intf.ipv4_private?}
end
</code></pre>

Both return an Addrinfo object, so if you need a string you can use the <code>ip_address()</code> method, as in:

<pre><code>ip= my_first_public_ipv4.ip_address unless my_first_public_ipv4.nil?
</code></pre>

You can easily work out the more suitable solution to your case changing the Addrinfo methods used to filter the required interface address.

blocks|key|366349|text|io+=+IO.popen('hostname')
hostname+=+io.readlines

io+=+IO.popen('ifconfig')
ifconfig+=+io.readlines
ip+=+ifconfig[11].scan(/\+\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\+/)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|366350|使用require+'socket'得到的两个答案看起来不错。使用request.blah_blah_blah的应用程序假设您使用的是Rails。|unstyled|offset|length|style|CODE|366351|IO应该始终可用。此脚本的唯一问题是，如果在您的系统上的不同庄园中输出ifconfig，那么您将获得不同的IP结果。主机名查找应该是稳定的，如Sears。|366352|entityMap^0|0|2|G|0|Z|8|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|P|8|@$G|Q|H|R|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@$G|T|H|U|I|J]]|9|@]|A|$]]|$1|M|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|N|$]]

<pre><code>io = IO.popen('hostname')
hostname = io.readlines

io = IO.popen('ifconfig')
ifconfig = io.readlines
ip = ifconfig[11].scan(/\ \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\ /)
</code></pre>

The couple of answers with <code>require 'socket'</code> look good. The ones with request.blah_blah_blah
assume that you are using Rails. 

IO should be available all the time. The only problem with this script would be that if <code>ifconfig</code> is output in a different manor on your systems, then you would get different results for the IP. The hostname look up should be solid as Sears.

blocks|key|3161088|text|与在UNIX/LINUX上使用外部uname命令使用hostname的答案类似：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3161089|hostname+=+`uname+-n`.chomp.sub(/\..*/,'')++#+stripping+off+"\n"+and+the+network+name+if+present|code-block|syntax|javascript|3161090|对于正在使用的IP地址(您的机器可能有多个网络接口)，您可以使用如下内容：|3161091|+#+on+a+Mac:
+ip_addresses+=+`ifconfig+%7C+grep+'inet+'+%7C+grep+-v+127.0.0.1+%7C+cut+-d'+'+-f+2`.split
+=>+['10.2.21.122','10.8.122.12']

+#+on+Linux:
+ip_addresses+=+`ifconfig+-a+%7C+grep+'inet+'+%7C+grep+-v+127.0.0.1+%7C+cut+-d':'+-f+2+%7C+cut+-d'+'+-f+1`.split
+=>+['10.2.21.122','10.8.122.12']|3161092|entityMap^0|H|5|Q|8|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Similar to the answer using <code>hostname</code>, using the external <code>uname</code> command on UNIX/LINUX:

<pre><code>hostname = `uname -n`.chomp.sub(/\..*/,'') # stripping off "\n" and the network name if present
</code></pre>

for the IP addresses in use (your machine could have multiple network interfaces),
you could use something like this:

<pre><code> # on a Mac:
 ip_addresses = `ifconfig | grep 'inet ' | grep -v 127.0.0.1 | cut -d' ' -f 2`.split
 =&gt; ['10.2.21.122','10.8.122.12']

 # on Linux:
 ip_addresses = `ifconfig -a | grep 'inet ' | grep -v 127.0.0.1 | cut -d':' -f 2 | cut -d' ' -f 1`.split
 =&gt; ['10.2.21.122','10.8.122.12']
</code></pre>

I'm in the process of maintaining a Ruby on Rails app and am looking for an easy way to find the hostname or IP address of the box I'm on (since it's a VM and new instances may have different hostnames or IP addresses). Is there a quick and easy way to do this in Ruby on Rails?

Edit: The answer below is correct but the clarification Craig provided is useful (see also provided link in answer):

<blockquote>
 The [below] code does NOT make a
 connection or send any packets (to
 64.233.187.99 which is google). Since UDP is a stateless protocol connect()
 merely makes a system call which
 figures out how to route the packets
 based on the address and what
 interface (and therefore IP address)
 it should bind to. addr() returns an
 array containing the family (AF_INET),
 local port, and local address (which
 is what we want) of the socket.
</blockquote>

Getting the Hostname or IP in Ruby on Rails

服务器

Windows

路由

Linux

Perl

我正在维护一个Ruby on Rails应用程序，正在寻找一种简单的方法来找到我所在机器的主机名或IP地址(因为它是一个VM，新实例可能具有不同的主机名或IP地址)。在Ruby on Rails中有没有一种简单快捷的方法来做到这一点？编辑:下面的答案是正确的，但Craig提供的澄清是有用的(请参阅答案中提供的链接)：下...

问在Ruby on Rails中获取主机名或IP
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