[ovirt-users] Tunable parameters in ovirt engine
Hari Prasanth Loganathan
hariprasanth.l at msystechnologies.com
Thu Mar 8 13:19:28 UTC 2018
Hi Juan,
Could you help me with this question :
1) Is there a limitation in using the same token? Like one token can server
only X number of request?
On Thu, Mar 8, 2018 at 6:01 PM, Hari Prasanth Loganathan <
hariprasanth.l at msystechnologies.com> wrote:
> Hi Juan,
>
> Now we got a clue, I try to hit 100 concurrent request in which 1 request
> got failed with the 503 error, I observed this in apache ssl_access.log
>
> 172.30.36.167 - - [08/Mar/2018:17:22:42 +0530] "GET /ovirt-engine/api/vms/
> HTTP/1.1" 503 299
>
> Is it thrown from Apache / ovirt engine?
>
>
>
> On Thu, Mar 8, 2018 at 5:15 PM, Juan Hernández <jhernand at redhat.com>
> wrote:
>
>> I think the configuration is good. There may be some connections that the
>> server is closing before the client expected, but that is normal, in my
>> opinion.
>>
>>
>> On 03/08/2018 12:34 PM, Hari Prasanth Loganathan wrote:
>>
>>> This is the only error message we received from ab.
>>>
>>> I googled it and found that it is due to the connection drop. So It would
>>> be Great, If you could check my Apache server configuration I shared in
>>> the
>>> thread and let me know your thoughts on this.
>>>
>>> Thanks,
>>> Hari
>>>
>>> On Thu, Mar 8, 2018 at 4:56 PM, Juan Hernández <jhernand at redhat.com>
>>> wrote:
>>>
>>> But other than those SSL error messages, are the connections really
>>>> failing? Can you share the results reported by "ab"?
>>>>
>>>>
>>>> On 03/08/2018 12:16 PM, Hari Prasanth Loganathan wrote:
>>>>
>>>> No Juan, It is not working with any benchmark / application tool. It
>>>>> fails
>>>>> with the same error SSL handshake failed (5).
>>>>>
>>>>> Could you let me know the configuration of Apache web server is
>>>>> correct?
>>>>>
>>>>> Thanks,
>>>>> Hari
>>>>>
>>>>> On Thu, Mar 8, 2018 at 1:08 AM, Juan Hernández <jhernand at redhat.com>
>>>>> wrote:
>>>>>
>>>>> If you are still having problems I am inclined to think that it is a
>>>>>
>>>>>> client issue. For example, I'd try to remove the "-k" option from the
>>>>>> "ab"
>>>>>> command. If you use keep alive the server may decide anyhow to close
>>>>>> the
>>>>>> connection after certain number of requests, even if the client asks
>>>>>> to
>>>>>> keep it alive. Some clients don't handle that perfectly, "ab" may have
>>>>>> that
>>>>>> problem. If that makes the SSL error messages disappear then I think
>>>>>> you
>>>>>> can safely ignore them, and restore the "-k" option, if you want.
>>>>>>
>>>>>> On 03/07/2018 07:30 PM, Hari Prasanth Loganathan wrote:
>>>>>>
>>>>>> Thanks Juan for your response. Appreciate it.
>>>>>>
>>>>>>> But for some reason still, I am facing the same SSL handshake failed
>>>>>>> (5).
>>>>>>> Could you please check this configuration and let me know the issue
>>>>>>> in
>>>>>>> my
>>>>>>> ovirt engine environment.
>>>>>>>
>>>>>>> *Configuration of Apache server:*
>>>>>>>
>>>>>>>
>>>>>>> 1) httpd version,
>>>>>>>
>>>>>>> # httpd -v
>>>>>>> Server version: Apache/2.4.6 (CentOS)
>>>>>>> Server built: Oct 19 2017 20:39:16
>>>>>>>
>>>>>>> 2) I checked the status using the following command,
>>>>>>>
>>>>>>> # systemctl status httpd -l
>>>>>>> ● httpd.service - The Apache HTTP Server
>>>>>>> Loaded: loaded (/usr/lib/systemd/system/httpd.service;
>>>>>>> enabled;
>>>>>>> vendor
>>>>>>> preset: disabled)
>>>>>>> Active: active (running) since Wed 2018-03-07 23:46:32 IST;
>>>>>>> 1min
>>>>>>> 55s
>>>>>>> ago
>>>>>>> Docs: man:httpd(8)
>>>>>>> man:apachectl(8)
>>>>>>> Process: 4351 ExecStop=/bin/kill -WINCH ${MAINPID} (code=exited,
>>>>>>> status=0/SUCCESS)
>>>>>>> Main PID: 4359 (httpd)
>>>>>>> Status: "Total requests: 264; Current requests/sec: 0.1;
>>>>>>> Current
>>>>>>> traffic: 204 B/sec"
>>>>>>> CGroup: /system.slice/httpd.service
>>>>>>> ├─4359 /usr/sbin/httpd -DFOREGROUND
>>>>>>> ├─4360 /usr/sbin/httpd -DFOREGROUND
>>>>>>> ├─4362 /usr/sbin/httpd -DFOREGROUND
>>>>>>> ├─5100 /usr/sbin/httpd -DFOREGROUND
>>>>>>> ├─5386 /usr/sbin/httpd -DFOREGROUND
>>>>>>> ├─5415 /usr/sbin/httpd -DFOREGROUND
>>>>>>> └─5416 /usr/sbin/httpd -DFOREGROUND
>>>>>>>
>>>>>>> 3) Since the httpd is pointing to the path :
>>>>>>> /usr/lib/systemd/system/httpd.service
>>>>>>>
>>>>>>> vi /usr/lib/systemd/system/httpd.service
>>>>>>>
>>>>>>> [Unit]
>>>>>>> Description=The Apache HTTP Server
>>>>>>> After=network.target remote-fs.target nss-lookup.target
>>>>>>> Documentation=man:httpd(8)
>>>>>>> Documentation=man:apachectl(8)
>>>>>>>
>>>>>>> [Service]
>>>>>>> Type=notify
>>>>>>> EnvironmentFile=/etc/sysconfig/httpd
>>>>>>> ExecStart=/usr/sbin/httpd $OPTIONS -DFOREGROUND
>>>>>>> ExecReload=/usr/sbin/httpd $OPTIONS -k graceful
>>>>>>> ExecStop=/bin/kill -WINCH ${MAINPID}
>>>>>>> # We want systemd to give httpd some time to finish gracefully, but
>>>>>>> still
>>>>>>> want
>>>>>>> # it to kill httpd after TimeoutStopSec if something went wrong
>>>>>>> during
>>>>>>> the
>>>>>>> # graceful stop. Normally, Systemd sends SIGTERM signal right after
>>>>>>> the
>>>>>>> # ExecStop, which would kill httpd. We are sending useless SIGCONT
>>>>>>> here
>>>>>>> to
>>>>>>> give
>>>>>>> # httpd time to finish.
>>>>>>> KillSignal=SIGCONT
>>>>>>> PrivateTmp=true
>>>>>>>
>>>>>>> [Install]
>>>>>>> WantedBy=multi-user.target
>>>>>>>
>>>>>>>
>>>>>>> 4) As per the above command I found the env file is available
>>>>>>> '/etc/sysconfig/httpd'
>>>>>>>
>>>>>>> vi /etc/sysconfig/httpd
>>>>>>>
>>>>>>> #
>>>>>>> # This file can be used to set additional environment variables for
>>>>>>> # the httpd process, or pass additional options to the httpd
>>>>>>> # executable.
>>>>>>> #
>>>>>>> # Note: With previous versions of httpd, the MPM could be changed by
>>>>>>> # editing an "HTTPD" variable here. With the current version, that
>>>>>>> # variable is now ignored. The MPM is a loadable module, and the
>>>>>>> # choice of MPM can be changed by editing the configuration file
>>>>>>> /etc/httpd/conf.modules.d/00-mpm.conf
>>>>>>> #
>>>>>>>
>>>>>>> #
>>>>>>> # To pass additional options (for instance, -D definitions) to the
>>>>>>> # httpd binary at startup, set OPTIONS here.
>>>>>>> #
>>>>>>> #OPTIONS=
>>>>>>>
>>>>>>> #
>>>>>>> # This setting ensures the httpd process is started in the "C" locale
>>>>>>> # by default. (Some modules will not behave correctly if
>>>>>>> # case-sensitive string comparisons are performed in a different
>>>>>>> # locale.)
>>>>>>> #
>>>>>>> LANG=C
>>>>>>>
>>>>>>>
>>>>>>> 5) As per the above command, I found that the conf fileis available
>>>>>>> in
>>>>>>> the
>>>>>>> path : /etc/httpd/conf.modules.d/00-mpm.conf
>>>>>>>
>>>>>>> vi /etc/httpd/conf.modules.d/00-mpm.conf
>>>>>>>
>>>>>>> # Select the MPM module which should be used by uncommenting exactly
>>>>>>> # one of the following LoadModule lines:
>>>>>>>
>>>>>>> # prefork MPM: Implements a non-threaded, pre-forking web server
>>>>>>> # See: http://httpd.apache.org/docs/2.4/mod/prefork.html
>>>>>>> #LoadModule mpm_prefork_module modules/mod_mpm_prefork.so
>>>>>>>
>>>>>>> # worker MPM: Multi-Processing Module implementing a hybrid
>>>>>>> # multi-threaded multi-process web server
>>>>>>> # See: http://httpd.apache.org/docs/2.4/mod/worker.html
>>>>>>> #
>>>>>>> LoadModule mpm_worker_module modules/mod_mpm_worker.so
>>>>>>>
>>>>>>> # event MPM: A variant of the worker MPM with the goal of consuming
>>>>>>> # threads only for connections with active processing
>>>>>>> # See: http://httpd.apache.org/docs/2.4/mod/event.html
>>>>>>> #
>>>>>>> #LoadModule mpm_event_module modules/mod_mpm_event.so
>>>>>>>
>>>>>>> <IfModule mpm_worker_module>
>>>>>>> ServerLimit 1000
>>>>>>> MaxRequestWorkers 1000
>>>>>>> </IfModule>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> As per your comment, I enabled the 'LoadModule mpm_worker_module
>>>>>>> modules/mod_mpm_worker.so' with the ServerLimit and
>>>>>>> MaxRequestWorkers as
>>>>>>> 1000 still I am facing the issue for the following command in apache
>>>>>>> benchmark test.
>>>>>>>
>>>>>>> Completed 100 requests
>>>>>>> SSL handshake failed (5).
>>>>>>> SSL handshake failed (5).
>>>>>>> SSL handshake failed (5).
>>>>>>> SSL handshake failed (5).
>>>>>>> SSL handshake failed (5).
>>>>>>> SSL handshake failed (5).
>>>>>>>
>>>>>>>
>>>>>>> NOTE : It always scales when I have concurrent request below 400
>>>>>>>
>>>>>>> What is wrong in this apache configuration, why SSL handshake is
>>>>>>> failing
>>>>>>> for concurrent request above 400 ?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Hari
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Wed, Mar 7, 2018 at 9:20 PM, Juan Hernández <jhernand at redhat.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>> It means that with the default configuration the Apache web server
>>>>>>> can't
>>>>>>>
>>>>>>> serve more than 256 concurrent connections. This applies to any
>>>>>>>> application
>>>>>>>> that uses Apache as the web frontend, not just to oVirt. If you
>>>>>>>> want to
>>>>>>>> change that you have to change the MaxRequestWorkers and ServerLimit
>>>>>>>> parameters, as explained here:
>>>>>>>>
>>>>>>>> https://httpd.apache.org/docs/2.4/mod/mpm_common.html#m
>>>>>>>> axrequestworkers
>>>>>>>>
>>>>>>>> So, go to your oVirt engine machine and create a
>>>>>>>> /etc/httpd/conf.d/my.conf
>>>>>>>> file with this content:
>>>>>>>>
>>>>>>>> MaxRequestWorkers 1000
>>>>>>>> ServerLimit 1000
>>>>>>>>
>>>>>>>> Then restart the Apache server:
>>>>>>>>
>>>>>>>> # systemctl restart httpd
>>>>>>>>
>>>>>>>> Then your web server should be able to handle 1000 concurrent
>>>>>>>> requests,
>>>>>>>> and you will probably start to find other limits, like the amount of
>>>>>>>> memory
>>>>>>>> and CPU that those 1000 Apache child processes will consume, the
>>>>>>>> number
>>>>>>>> of
>>>>>>>> threads in the JBoss application server, the number of connections
>>>>>>>> to
>>>>>>>> the
>>>>>>>> database, etc.
>>>>>>>>
>>>>>>>> Let me insist a bit that if you base your benchmark solely on the
>>>>>>>> number
>>>>>>>> of concurrent requests or connections that the server can handle you
>>>>>>>> may
>>>>>>>> end up with meaningless results, as a real world application
>>>>>>>> can/should
>>>>>>>> use
>>>>>>>> the server much better than that.
>>>>>>>>
>>>>>>>> On 03/07/2018 04:33 PM, Hari Prasanth Loganathan wrote:
>>>>>>>>
>>>>>>>> With the default configuration of the web server it is impossible to
>>>>>>>>
>>>>>>>> handle
>>>>>>>>> more than 256 *connections* simultaneously. I guess that "ab" is
>>>>>>>>> opening a
>>>>>>>>> connection for each concurrent request, so when you reach request
>>>>>>>>> 257
>>>>>>>>> the
>>>>>>>>> web server will just reject the connection, there is nothing that
>>>>>>>>> the
>>>>>>>>> JBoss
>>>>>>>>> can do about it; you have to increase the number of connections
>>>>>>>>> supported
>>>>>>>>> by the web server.
>>>>>>>>>
>>>>>>>>> *So Does it mean that oVirt cannot serve more than 257 request? *
>>>>>>>>>
>>>>>>>>> My question is, If its possible How to scale this and what is the
>>>>>>>>> configuration we need to change?
>>>>>>>>>
>>>>>>>>> Also, we are taking a benchmark in using oVirt, So I need to find
>>>>>>>>> the
>>>>>>>>> maximum possible oVirt request. So please let me know the
>>>>>>>>> configuration
>>>>>>>>> tuning for oVirt to achieve maximum concurrent request.
>>>>>>>>>
>>>>>>>>> Thanks,
>>>>>>>>> Hari
>>>>>>>>>
>>>>>>>>> On Wed, Mar 7, 2018 at 7:25 PM, Juan Hernández <
>>>>>>>>> jhernand at redhat.com>
>>>>>>>>> wrote:
>>>>>>>>>
>>>>>>>>> With the default configuration of the web server it is impossible
>>>>>>>>> to
>>>>>>>>>
>>>>>>>>> handle more than 256 *connections* simultaneously. I guess that
>>>>>>>>> "ab"
>>>>>>>>>
>>>>>>>>>> is
>>>>>>>>>> opening a connection for each concurrent request, so when you
>>>>>>>>>> reach
>>>>>>>>>> request
>>>>>>>>>> 257 the web server will just reject the connection, there is
>>>>>>>>>> nothing
>>>>>>>>>> that
>>>>>>>>>> the JBoss can do about it; you have to increase the number of
>>>>>>>>>> connections
>>>>>>>>>> supported by the web server.
>>>>>>>>>>
>>>>>>>>>> Or else you may want to re-consider why you want to use 1000
>>>>>>>>>> simultaneous
>>>>>>>>>> connections. It may be OK for a performance test, but there are
>>>>>>>>>> better
>>>>>>>>>> ways
>>>>>>>>>> to squeeze performance. For example, you could consider using HTTP
>>>>>>>>>> pipelining, which is much more friendly for the server than so
>>>>>>>>>> many
>>>>>>>>>> connections. This is what we use when we need to send a large
>>>>>>>>>> number
>>>>>>>>>> of
>>>>>>>>>> requests from other systems. There are examples of how to do that
>>>>>>>>>> with
>>>>>>>>>> the
>>>>>>>>>> Python and Ruby SDKs here:
>>>>>>>>>>
>>>>>>>>>> Python:
>>>>>>>>>>
>>>>>>>>>> https://github.com/oVirt/ovirt-engine-sdk/blob/master/sdk/
>>>>>>>>>> examples/asynchronous_inventory.py
>>>>>>>>>>
>>>>>>>>>> Ruby:
>>>>>>>>>>
>>>>>>>>>> https://github.com/oVirt/ovirt-engine-sdk-ruby/blob/master/
>>>>>>>>>> sdk/examples/asynchronous_inventory.rb
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On 03/07/2018 02:43 PM, Hari Prasanth Loganathan wrote:
>>>>>>>>>>
>>>>>>>>>> Hi Juan,
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Thanks for the response.
>>>>>>>>>>>
>>>>>>>>>>> I agree web server can handle only limited number of concurrent
>>>>>>>>>>> requests.
>>>>>>>>>>> But Why it is failing with SSL handshake failure for few
>>>>>>>>>>> requests,
>>>>>>>>>>> Can't
>>>>>>>>>>> the JBOSS wait and serve the request? We can spare the delay but
>>>>>>>>>>> not
>>>>>>>>>>> with
>>>>>>>>>>> the request fails. So Is there a configuration in oVirt which
>>>>>>>>>>> can be
>>>>>>>>>>> tuned
>>>>>>>>>>> to achieve this?
>>>>>>>>>>>
>>>>>>>>>>> Thanks,
>>>>>>>>>>> Hari
>>>>>>>>>>>
>>>>>>>>>>> On Wed, Mar 7, 2018 at 7:05 PM, Juan Hernández <
>>>>>>>>>>> jhernand at redhat.com
>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> wrote:
>>>>>>>>>>>
>>>>>>>>>>> The first thing you will need to change for such a test is the
>>>>>>>>>>> number
>>>>>>>>>>> of
>>>>>>>>>>>
>>>>>>>>>>> simultaneous connections accepted by the Apache web server: by
>>>>>>>>>>> default
>>>>>>>>>>>
>>>>>>>>>>> the
>>>>>>>>>>>> max is 256. See the Apache documentation here:
>>>>>>>>>>>>
>>>>>>>>>>>> https://httpd.apache.org/docs/2.4/mod/mpm_common.html#m
>>>>>>>>>>>> axrequestworkers
>>>>>>>>>>>>
>>>>>>>>>>>> In addition I also suggest that you consider using the "worker"
>>>>>>>>>>>> multi-processing module instead of the "prefork", as it usually
>>>>>>>>>>>> works
>>>>>>>>>>>> better when talking to a Java application server, because it
>>>>>>>>>>>> re-uses
>>>>>>>>>>>> connections better.
>>>>>>>>>>>>
>>>>>>>>>>>> On 03/07/2018 02:20 PM, Hari Prasanth Loganathan wrote:
>>>>>>>>>>>>
>>>>>>>>>>>> Hi Team,
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> *Description of problem:*
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> I am trying to achieve 1000 concurrent request to oVirt. What
>>>>>>>>>>>>> are
>>>>>>>>>>>>> the
>>>>>>>>>>>>> tunable parameters to achieve this?
>>>>>>>>>>>>>
>>>>>>>>>>>>> I tried to perform the benchmarking for ovirt engine using
>>>>>>>>>>>>> Apache
>>>>>>>>>>>>> benchmark
>>>>>>>>>>>>> using the same SSO token.
>>>>>>>>>>>>>
>>>>>>>>>>>>> ab -n 1000 -c 500 -k -H "accept: application/json" -H
>>>>>>>>>>>>> "Authorization:
>>>>>>>>>>>>> Bearer SSOTOKEN" https://172.30.56.70/ovirt-engine/
>>>>>>>>>>>>> <https://172.30.56.70/ovirt-engine/api/vms/5440271b-afb3-48b
>>>>>>>>>>>>> b-9ff1-076fc07ebf50/statistics>
>>>>>>>>>>>>>
>>>>>>>>>>>>> When the number of concurrent request is 500, we are getting
>>>>>>>>>>>>> more
>>>>>>>>>>>>> than
>>>>>>>>>>>>> 100
>>>>>>>>>>>>> failures with the following error,
>>>>>>>>>>>>>
>>>>>>>>>>>>> SSL read failed (1) - closing connection
>>>>>>>>>>>>> 139620982339352:error:
>>>>>>>>>>>>>
>>>>>>>>>>>>> NOTE: It is scaling for concurrent request below 500.
>>>>>>>>>>>>>
>>>>>>>>>>>>> I used the profiler to get the memory and CPU and it seems very
>>>>>>>>>>>>> less,
>>>>>>>>>>>>>
>>>>>>>>>>>>> PID USER PR NI VIRT RES SHR S %CPU %MEM
>>>>>>>>>>>>> TIME+
>>>>>>>>>>>>> COMMAND
>>>>>>>>>>>>> 30413 ovirt 20 0 4226664 882396 6776 S 126.0 23.0
>>>>>>>>>>>>> 27:48.53
>>>>>>>>>>>>> java
>>>>>>>>>>>>>
>>>>>>>>>>>>> Configuration of the machine in which Ovirt is deployed :
>>>>>>>>>>>>>
>>>>>>>>>>>>> RAM - 4GB,
>>>>>>>>>>>>> Hard disk - 100GB,
>>>>>>>>>>>>> core processor - 2,
>>>>>>>>>>>>> OS - Cent7.x.
>>>>>>>>>>>>>
>>>>>>>>>>>>> In which 2GB is allocated to oVirt.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Version-Release number of selected component (if applicable):
>>>>>>>>>>>>>
>>>>>>>>>>>>> 4.2.2
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> How reproducible:
>>>>>>>>>>>>>
>>>>>>>>>>>>> If the number of concurrent requests are above 500, we are
>>>>>>>>>>>>> easily
>>>>>>>>>>>>> facing
>>>>>>>>>>>>> this issue.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> *Actual results:*
>>>>>>>>>>>>>
>>>>>>>>>>>>> SSL read failed (1) - closing connection
>>>>>>>>>>>>> 139620982339352:error:
>>>>>>>>>>>>>
>>>>>>>>>>>>> *Expected results:*
>>>>>>>>>>>>>
>>>>>>>>>>>>> Request success.
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> Thanks,
>>>>>>>>>>>>> Hari
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>> Users mailing list
>>>>>>>>>>>>> Users at ovirt.org
>>>>>>>>>>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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