blocks|key|1117552|text|当pid已写入$CATALINA_PID文件时，为什么选择grep+ps？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1117553|我有一个cron'd+checker脚本，它在tomcat关闭时发送一封电子邮件：|1117554|kill+-0+`cat+$CATALINA_PID`+>+/dev/null+2>&1
if+[+$?+-gt+0+]
then
++++echo+"Check+tomcat"+%7C+mailx+-s+"Tomcat+not+running"+support@dom.com
fi|code-block|syntax|javascript|1117555|我猜你也可以使用wget来检查你的tomcat的健康状况。如果您有一个包含用户加载等内容的诊断页面，您可以定期获取它并对其进行解析，以确定是否出现了错误。|1117556|entityMap^0|7|D|T|7|0|4|4|0|0|8|4|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|6|7|V|8|@$9|W|A|X|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|P|$]]

Why <code>grep ps</code>, when the pid has been written to the <code>$CATALINA_PID</code> file?

I have a <code>cron</code>'d checker script which sends out an email when tomcat is down:

<pre><code>kill -0 `cat $CATALINA_PID` &gt; /dev/null 2&gt;&amp;1
if [ $? -gt 0 ]
then
 echo "Check tomcat" | mailx -s "Tomcat not running" support@dom.com
fi
</code></pre>

I guess you could also use <code>wget</code> to check the health of your tomcat. If you have a diagnostics page with user load etc, you could fetch it periodically and parse it to determine if anything is going wrong.

blocks|key|902851|text|在我的linux系统上，我使用startup.sh脚本启动Tomcat。要知道它是否正在运行，我使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|902852|ps+-ef+%7C+grep+tomcat++|code-block|syntax|javascript|902853|如果输出结果包含tomcat文件夹的完整路径，则它正在运行|902854|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

On my linux system, I start Tomcat with the startup.sh script. To know whether it is running or not, i use 

<pre><code>ps -ef | grep tomcat 
</code></pre>

If the output result contains the whole path to my tomcat folder, then it is running

blocks|key|1117500|text|如果您知道netstat+-lnp+%7C+grep+8080的监听端口，那么它可能是最好的方法。如果你想确定它是否正常工作，你必须建立一个连接，发送一个HTTP请求并得到一个响应。您可以通过编程或使用任何web浏览器来执行此操作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1117501|entityMap^0|5|O|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

<code>netstat -lnp | grep 8080</code> would probably be the best way, if you know Tomcat's listening port. If you want to be certain that is is functional, you will have to establish a connection and send an HTTP request and get a response. You can do this programatically, or using any web browser.

blocks|key|1117702|text|您可以通过以下方式查看tomcat的状态：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1117703|ps+-ef+%7C+grep+tomcat++|code-block|syntax|javascript|1117704|如果tomcat正在运行，这将返回tomcat路径。|1117705|netstat+-a+%7C+grep+8080|1117706|其中8080是tomcat端口|1117707|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You can check the status of tomcat with the following ways:

<pre><code>ps -ef | grep tomcat 
</code></pre>

This will return the tomcat path if the tomcat is running

<pre><code>netstat -a | grep 8080
</code></pre>

where 8080 is the tomcat port

blocks|key|902987|text|wget+url或curl+url，其中url是应可用的tomcat服务器的url，例如：wget+http://localhost:8080。然后检查退出代码，如果是0-+tomcat已启动。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|902988|entityMap^0|0|8|9|8|19|Q|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

<code>wget url</code> or <code>curl url</code>
where url is a url of the tomcat server that should be available, for example:
<code>wget http://localhost:8080</code>.
Then check the exit code, if it's 0 - tomcat is up.

blocks|key|903137|text|创建一个Shell脚本来检查tomcat是启动还是关闭，并为sh设置一个cron，使其每隔几分钟检查一次，如果关闭，则自动启动tomcat。下面的示例代码片段|type|unstyled|depth|inlineStyleRanges|entityRanges|data|903138|TOMCAT_PID=$(ps+-ef+%7C+awk+'/[t]omcat/{print+$2}')
echo+TOMCAT+PROCESSID+$TOMCAT_PID

if+[+-z+"$TOMCAT_PID"+]
then
++++echo+"TOMCAT+NOT+RUNNING"
++++sudo+/opt/tomcat/bin/startup.sh
else
+++echo+"TOMCAT+RUNNING"
fi|code-block|syntax|javascript|903139|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|$]]

Create a Shell script that checks if tomcat is up or down and set a cron for sh to make it check every few minutes, and auto start tomcat if down. Sample Snippet of code below 

<pre><code>TOMCAT_PID=$(ps -ef | awk '/[t]omcat/{print $2}')
echo TOMCAT PROCESSID $TOMCAT_PID

if [ -z "$TOMCAT_PID" ]
then
 echo "TOMCAT NOT RUNNING"
 sudo /opt/tomcat/bin/startup.sh
else
 echo "TOMCAT RUNNING"
fi
</code></pre>

blocks|key|902915|text|我一直都是这样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|902916|tail+-f+logs/catalina.out|code-block|syntax|javascript|902917|当我看到那里|902918|INFO:+Server+startup+in+77037+ms|902919|那我就知道服务器启动了。|902920|entityMap^0|0|0|0|0|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]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I always do 

<pre><code>tail -f logs/catalina.out
</code></pre>

When I see there 

<pre><code>INFO: Server startup in 77037 ms
</code></pre>

then I know the server is up.

blocks|key|902685|text|我发现Tomcat相当挑剔，因为运行中的进程或开放的端口并不一定意味着它实际上正在处理请求。我通常会尝试抓取一个已知的页面，并将其内容与预先计算的期望值进行比较。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|902686|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|$]]

I've found Tomcat to be rather finicky in that a running process or an open port doesn't necessarily mean it's actually handling requests. I usually try to grab a known page and compare its contents with a precomputed expected value.

blocks|key|1117621|text|您是否正在尝试设置警报系统？对于简单的“心跳”，向Tomcat端口发出HTTP请求。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1117622|对于更详细的监控，您可以设置JMX和/或SNMP来查看JVM统计信息。我们使用SNMP插件(桥到JMX)运行Nagios来检查Tomcat内存使用情况，并每10-15分钟请求线程池大小。|1117623|http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html|offset|length|1117624|更新(2012)：|1117625|我们已经升级了我们的系统，使用"monit“来检查tomcat进程。我真喜欢它。只需很少的配置，它就会自动验证服务是否正在运行，如果服务没有运行，它会自动重新启动。(发送电子邮件警报)。它可以与/etc/init.d脚本集成，也可以通过进程名进行检查。|1117626|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@$F|V|G|W|1|X]]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|E]]]]

Are you trying to set up an alert system? For a simple "heartbeat", do a HTTP request to the Tomcat port.

For more elaborate monitoring, you can set up JMX and/or SNMP to view JVM stats. We run Nagios with the SNMP plugin (bridges to JMX) to check Tomcat memory usage and request thread pool size every 10-15 minutes.

<a href="http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html" rel="nofollow">http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html</a>

Update (2012):

We have upgraded our systems to use "monit" to check the tomcat process. I really like it. With very little configuration it automatically verifies the service is running, and automatically restarts if it is not. (sending an email alert). It can integrate with the /etc/init.d scripts or check by process name.

blocks|key|1117815|text|因为我的tomcat实例被命名为tomcat_。例如。tomcat_8086，我用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1117816|1117817|ps+aux+%7C+grep+tomcat|code-block|syntax|javascript|1117818|另一种方法是使用nc实用程序|1117819|nc+-l+8086+(端口号)|offset|length|style|CODE|1117820|或|1117821|ps+aux+%7C+grep+java|1117822|entityMap^0|0|0|0|0|0|A|0|0|0|I|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|X|8|@]|9|@]|A|$F|G]]|$1|H|3|I|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Z|8|@$L|10|M|11|N|O]]|9|@]|A|$]]|$1|P|3|Q|5|6|7|12|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|13|8|@$L|14|M|15|N|O]]|9|@]|A|$]]|$1|T|3|-4|5|6|7|16|8|@]|9|@]|A|$]]]|U|$]]

Since my tomcat instances are named as tomcat_ . For example. tomcat_8086, I use

# 

<pre><code>ps aux | grep tomcat
</code></pre>

Other method is using nc utility

<h1><code>nc -l 8086</code> (port number )</h1>

Or

<h1><code>ps aux | grep java</code></h1>

blocks|key|1117861|text|尝试此命令|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1117862|ps+-ef+%7C+awk+'/[t]omcat/{print+$2}'+|code-block|syntax|javascript|1117863|如果tomcat正在运行，它将返回pid。|1117864|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Try this command 

<pre><code>ps -ef | awk '/[t]omcat/{print $2}' 
</code></pre>

It will return the pid if tomcat is running.

Interested to know how people usually check to see if Tomcat is running on a Unix environment. 

I either check that the process is running using 

<pre><code>ps -ef | grep java
ps -ef | grep logging
</code></pre>

or i check that the port number is active

<pre><code>netstat -a | grep 8080
</code></pre>

is there a better way of checking that Tomcat is running? The above seem to be to be a 'hacky' way of checking that Tomcat is running.

Is Tomcat running?

服务器

Unix

有兴趣了解人们通常如何检查Tomcat是否在Unix环境中运行。我可以使用以下命令检查进程是否正在运行ps -ef | grep javaps -ef | grep logging或者我检查端口号是否处于活动状态netstat -a | grep 8080有没有更好的方法来检查Tomcat是否正在运行？上面的代码似乎是检查Tomcat是否正在运行的一种“老套”的方法。

问Tomcat在运行吗？
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