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Date: Thu, 03 Apr 2014 11:14:08 +0200
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: AW: AW: grab hostname from tomcat manager
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Bjoern.Becker@easycash.de wrote:
>> -----Ursprüngliche Nachricht-----
>> Von: Christopher Schultz [mailto:chris@christopherschultz.net]
>> Gesendet: Mittwoch, 2. April 2014 22:33
>> An: Tomcat Users List
>> Betreff: Re: AW: grab hostname from tomcat manager
>>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA256
>>
>> Bjorn,
>>
>> On 4/2/14, 10:54 AM, Bjoern.Becker@easycash.de wrote:
>>>> -----Ursprüngliche Nachricht----- Von: André Warnier
>>>> [mailto:aw@ice-sa.com] Gesendet: Mittwoch, 2. April 2014 16:35
>>>> An: Tomcat Users List Betreff: Re: grab hostname from tomcat manager
>>>>
>>>> Bjoern.Becker@easycash.de wrote:
>>>>> Hello,
>>>>>
>>>>> I need to grab the hostname from the tomcat manager somehow.
>>>>> Unfortunately this URL "manager/text/serverinfo" doesn't contain
>> the
>>>> hostname.
>>>>> Is there any other smart way to receive the hostname via tomcat
>>>> manager app?
>>>> For give me for asking, but how do you access the tomcat manager if
>>>> you do not know the hostname ?
>>> Good question :). But I got a good reason for it.
>>>
>>> I got two servers with several tomcat instances. In front of them is
>> a
>>> loadbalancer with is configured to do a failover.
>>>
>>> -LB- /               \ Server1:8081 	    Server2:8081
>>>
>>> I need to write a shell script to sync a specific directory and for
>>> each tomcat instance I need to know on which one the loadbalancer is
>>> targeting at the moment.
>> How will you check to see which one the lb is targeting?
> 
> That's the question. 
> 
>>> If tomcat 8081 on server 1 is down, the loadbalancer will point to
>>> server 2 tomcat 8081. I can find it out through the loadbalancer
>>> address only.
>> You should probably set a jvmRoute in your <Engine> in server.xml.
>> That way, you can detect which back-end server you are getting just by
>> looking at the JSESSIONID cookie.
> 
> That's the answer. When jvmroute is define I easily can receive the jsession id with wget:
> 
> wget -q -O - --no-cache --keep-session-cookies --no-check-certificate --save-cookies cookies.txt https://loadbalanceraddress:8081/manager  --user=user--password=secure 1>/dev/null
> 
> perfect! 
> 

Alternatively, I suppose that you could just create a small JSP (or even HTML, but then 
host-specific) page in each host, which returns the real hostname.

You should probably be careful however : in your rsync scenario above, is there any 
guarantee that between the time you ask for the hostname (in whatever way), and the time 
at which you do your rsync, the "targeted host" will still be the same ?
Remember that if things /can/ happen, they /do/ happen.


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