blocks|key|3147637|text|nginx+-s+reload仅用于通知正在运行的nginx进程重新加载其配置。在停止之后，您不需要向正在运行的nginx进程发送信号。只需运行nginx+(可能使用-c+/path/to/config/file)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3147638|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

nginx -s reload is only used to tell a running nginx process to reload its config. After a stop, you don't have a running nginx process to send a signal to. Just run nginx (possibly with a -c /path/to/config/file)

blocks|key|2933032|text|在我的例子中，我通过启动服务解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2933033|sudo+/etc/init.d/nginx+start|2933034|上面的命令将启动Debian/Ubuntu中的服务。如果有任何问题(例如Apache在同一端口侦听)，它将发出一个错误|2933035|在此之后，nginx+-s重新加载将非常有用。|2933036|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

in my case I solved this by starting the service. 

sudo /etc/init.d/nginx start

The command above will start the service in Debian/Ubuntu. It will issue an error if there is any problem (like Apache listening in the same port)

After that nginx -s reload will work like a charm

blocks|key|3147731|text|在我下载的最新版本(1.2.0)中，没有"-s+start“选项，它会显示”nginx:+invalid+option："-s+start“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3147732|您可以通过以下方式启动nginx|3147733|sudo+/etc/nginx/sbin/nginx|code-block|syntax|javascript|3147734|服务器将启动，然后将不会有任何无效的pid编号错误。|3147735|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In the latest version(1.2.0) that I downloaded there is no "-s start" option, it will say
nginx: invalid option: "-s start"

You can start nginx by

<pre><code>sudo /etc/nginx/sbin/nginx
</code></pre>

The server will be started and then there wont be any Invalid pid number errors.

blocks|key|2933140|text|在我的例子中，nginx被停止了(我想是崩溃了)。通过以下方式解决了此问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2933141|service+nginx+status
nginx+stop/waiting

service+nginx+start
nginx+start/running,+process+3535|code-block|syntax|javascript|2933142|然后，nginx+-s重新加载就像一个护身符一样工作。|2933143|我在trusty上使用nginx/1.8.0。|2933144|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In my case nginx was stopped (crashed I assume). Solved the issue by:

<pre><code>service nginx status
nginx stop/waiting

service nginx start
nginx start/running, process 3535
</code></pre>

Then nginx -s reload worked like a charm. 

I am using nginx/1.8.0 on trusty.

blocks|key|251768|text|为了避免重启nginx造成的停机，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|251769|ps+aux+%7C+grep+nginx+
PID+of+nginx+master+process

echo+PID+>+/var/run/nginx.pid
nginx+-s+reload|code-block|syntax|javascript|251770|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|$]]

To avoid downtime with restarting nginx,

<pre><code>ps aux | grep nginx 
PID of nginx master process

echo PID &gt; /var/run/nginx.pid
nginx -s reload
</code></pre>

blocks|key|255097|text|这将清除ubuntu+16.04及更高版本上的问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|255098|sudo+service+nginx+stop++++|code-block|syntax|javascript|255099|您可能需要删除pid文件nginx.pid，其位置可能在文件/etc/nginx/nginx.conf中定义，如下所示|offset|length|style|CODE|255100|cat+/etc/nginx/nginx.conf+%7C+grep+pid++#++see+if+pid+file+is+defined|255101|此行可能位于文件/etc/nginx/nginx.conf中|255102|pid+/run/nginx.pid;++#++in+file+/etc/nginx/nginx.conf|255103|如果pid文件确实存在，则立即将其删除|255104|ls+-la++/var/run/nginx/pid++#++this+file+may+live+elsewhere
ls+-la++/run/nginx.pid++#++on+Ubuntu+16.04%2B|255105|删除pid文件后，让我们启动nginx|255106|sudo+service+nginx+start

ps+-eaf%7Cgrep+nginx++++++++#++confirm+its+running

sudo+nginx+-t+&&+sudo+nginx+-s+reload+++#++confirm+config+is+OK

#++++++typical+output
#++nginx:+the+configuration+file+/etc/nginx/nginx.conf+syntax+is+ok
#++nginx:+configuration+file+/etc/nginx/nginx.conf+test+is+successful


sudo+service+nginx+stop+++#+++issue+stop

ps+-eaf%7Cgrep+nginx++++++++#+++confirm+it+actually+stopped|255107|现在已经恢复了理智，你可以随意发射了。|255108|entityMap^0|0|0|C|9|U|L|0|0|8|L|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|16|8|@$I|17|J|18|K|L]|$I|19|J|1A|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|1B|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1C|8|@$I|1D|J|1E|K|L]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|1F|8|@]|9|@]|A|$E|F]]|$1|S|3|T|5|6|7|1G|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|1H|8|@]|9|@]|A|$E|F]]|$1|W|3|X|5|6|7|1I|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|D|7|1J|8|@]|9|@]|A|$E|F]]|$1|10|3|11|5|6|7|1K|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1L|8|@]|9|@]|A|$]]]|13|$]]

This will clear out the issue on ubuntu 16.04 and above
<pre><code>sudo service nginx stop 
</code></pre>
you may need to remove the pid file <code>nginx.pid</code> whose location may be defined in file <code>/etc/nginx/nginx.conf</code> look for line like
<pre><code>cat /etc/nginx/nginx.conf | grep pid # see if pid file is defined
</code></pre>
this line may live in file <code>/etc/nginx/nginx.conf</code>
<pre><code>pid /run/nginx.pid; # in file /etc/nginx/nginx.conf
</code></pre>
if pid file does exist then remove it now
<pre><code>ls -la /var/run/nginx/pid # this file may live elsewhere
ls -la /run/nginx.pid # on Ubuntu 16.04+
</code></pre>
after the pid file has been removed lets launch nginx
<pre><code>sudo service nginx start

ps -eaf|grep nginx # confirm its running

sudo nginx -t &amp;&amp; sudo nginx -s reload # confirm config is OK

# typical output
# nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
# nginx: configuration file /etc/nginx/nginx.conf test is successful


sudo service nginx stop # issue stop

ps -eaf|grep nginx # confirm it actually stopped
</code></pre>
now sanity has been restored and you are free to launch at will

blocks|key|250144|text|在CentOS+7上，我是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|250145|+sudo+systemctl+start+nginx
+#Then+check+all+things+are+OK
+sudo+systemctl+status+-l+nginx|code-block|syntax|javascript|250146|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|$]]

On CentOS 7 I done it with this:

<pre><code> sudo systemctl start nginx
 #Then check all things are OK
 sudo systemctl status -l nginx
</code></pre>

blocks|key|2933315|text|如果手动停止或终止了nginx进程，就会发生这种情况。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2933316|检查进程是否仍在运行：|2933317|sudo+lsof+-nP+-iTCP:<port>+%7C+grep+LISTEN|code-block|syntax|javascript|2933318|我在mac上，我用以下命令重新安装了nginx：|2933319|brew+reinstall+nginx|2933320|然后使用brew启动该服务：|2933321|brew+services+start+nginx|2933322|entityMap^0|A|5|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|14|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|V|$]]

This happens if the <code>nginx</code> process was stopped manually or was killed.
Check if the process is still running:
<pre><code>sudo lsof -nP -iTCP:&lt;port&gt; | grep LISTEN
</code></pre>
I am on mac, and I reinstall the nginx with:
<pre><code>brew reinstall nginx
</code></pre>
Then start the service using brew:
<pre><code>brew services start nginx
</code></pre>

I issued a nginx -s stop and after that I got this error when trying to reload it.

<blockquote>
 [error]: invalid PID number "" in "/var/run/nginx.pid"
</blockquote>

That /var/run/nginx/pid file is empty atm.

What do I need to do to fix it?

Nginx Invalid PID number

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我发出了一个nginx -s停止，之后我得到了这个错误，当我试图重新加载它。错误:/var/run/nginx.pid中的PID编号"“无效”该/var/run/nginx/pid文件为空atm。我需要做些什么来修复它？

问Nginx无效的PID号
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