[SPAM] pcb maker

[Hebe-Mllordpcb]

  

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From: Hebe-MllordpcbSent: Sep 2015
  
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  Subject: PCB order
   
  

  
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Issue with Haproxy Reload

[Rajeev Jaggavarapu]

Hi,

We are using Haproxy on top of Mesos cluster, We are doing  dynamic reloads
for Haproxy based on marathon events (50-100 times in a day). We have
nearly *300 applications* that are running on Mesos (300 virtual hosts in
Haproxy). When we do dynamic reloads, Haproxy is taking long time to reload
Haproxy, we observed that for 50 applications takes *30-40secs to reload
Haproxy*. We have a single config file for Haproxy, when we do reload all
the applications are getting reloaded (Front-ends), this causing downtime
of all applications. Is there anyway to reduce the downtime and impact on
end-users.

We tried this scenario,
"
http://engineeringblog.yelp.com/2015/04/true-zero-downtime-haproxy-reloads.html
"

By this if user requests while reload, the requests are queued and serving
after reload.

But if we do multiple reloads one after another, *HaProxy old processes
persist even after reloading the HaProxy service*, this is causing the
serious issue.

root  7816  0.1  0.0  20024  3028 ?Ss   03:52   0:00
/usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -D
-sf 6778
root  7817  0.0  0.0  20024  3148 ?Ss   03:52   0:00
/usr/sbin/haproxy -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid -D
-sf 6778

Is there any solution stop the previous process once after it serving the
request.


Can we *separate the configurations based on front-ends like in Nginx*, so
that only those apps will effect if there is any changes in backend.

Thank you.

-- 
Best Regards,
Rajeev Jaggavarapu,​
Paxcel Labs.

Client Affinity in HAProxy with MQTT Broker

[Sourav Das]

Hi,

I have been going through the HAProxy documentation for my work which deals
with scaling and load balancing for MQTT Brokers.

However, I could not find any configuration regarding the Client Affinity
where the routing of the MQTT traffic is done based on the topic present in
the MQTT message. As MQTT is also carried over TCP, is it possible to use a
pre-configured hook in HAProxy so that the traffic can be routed to the
appropriate server based on the MQTT topic.

At present I am not able to find out any hook which enables this to be
done. I am a bit curious to know whether the support of MQTT is planned in
future releases of HAProxy.


Please let me know if this makes sense.

Regards,
Sourav

About CPU usage

[Dmitry Sivachenko]

Hello,

I have a haproxy-1.5.11 with a single frontend passing requests to a single 
backend in TCP mode (sample config).
Application establishes several long-living tcp connections and sends a lot of 
small requests over them.

In my test case I have 2 simultaneous TCP connections producing about 3 MB/sec, 
20 kpps input (as shown by netstat on backend machine) and approximately the 
same output.

haproxy process consumes about 20% of CPU core (I have a machine with 2 Intel 
Xeon E5-2650 v2 @ 2.60GHz).

In my understanding such CPU usage is rather high for the relatively low load.

I tried both FreeBSD and Linux and see similar results (I am interested in 
FreeBSD though).

Anything obvious I can tune?

Thanks.

Re: Client Affinity in HAProxy with MQTT Broker

[Baptiste]

On Thu, Sep 10, 2015 at 4:05 PM, Sourav Das  wrote:
> Hi,
>
> I have been going through the HAProxy documentation for my work which deals
> with scaling and load balancing for MQTT Brokers.
>
> However, I could not find any configuration regarding the Client Affinity
> where the routing of the MQTT traffic is done based on the topic present in
> the MQTT message. As MQTT is also carried over TCP, is it possible to use a
> pre-configured hook in HAProxy so that the traffic can be routed to the
> appropriate server based on the MQTT topic.
>
> At present I am not able to find out any hook which enables this to be done.
> I am a bit curious to know whether the support of MQTT is planned in future
> releases of HAProxy.
>
>
> Please let me know if this makes sense.
>
> Regards,
> Sourav


Hi Sourav,

This would be doable only if the information can be retrived from the
payload of the first request sent by the client.
could you provide more information about how MQTT protocol works? Is
there any server banner?
A simple TCP dump containing an example of the message you want to
route would be appreciated and allow us to deliver you an accurate
answer.

Baptiste

Send the same traffic to multiple backends

[Unknown User]

Is there a way to send the same traffic to multiple backends (sort of like
a tee), say a test and a prod backend? If so, can the return traffic from
one of the backend's be ignored?

Re: Send the same traffic to multiple backends

[Bryan Talbot]

Unless there is some LUA magic that can support this in the latest 1.6
development builds: no, that's not possible.

-Bryan


On Thu, Sep 10, 2015 at 8:18 PM, Unknown User 
wrote:

> Is there a way to send the same traffic to multiple backends (sort of like
> a tee), say a test and a prod backend? If so, can the return traffic from
> one of the backend's be ignored?
>
>
>

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