Thats why it's convenient to have a good monitoring system. (most use snmp to
check for error logs etc etc)
So even tho they ping back and everything else --> if there's a program error
you can get notified (same as warnings and alike).
Basically nagios and zenoss are both very capable monitoring systems - and with
4+ servers it's defenatly worth obtaining such a monitoring system.
(i'm guessing you got mail on ur mobile.. so just make it mail you on errors
and warnings --> then no matter where you are you will always be informed)
If you work in a team you can also set to inform on "cleared" (basically
problem solved) so on and so on..
monitors generally do not need high spec's.. (tho some recommend 4+ gb they run
stable with far less)
Regards,
Marco
--
Key4ce General Manager
---------------------------------------------------
Phone NL: +31 (0)40 290 3310
Phone EN: +44 (0)1332 898 999
Italielaan 9
Eindhoven
The Netherlands
---------------------------------------------------
http://www.key4ce.com
-----Original Message-----
From: Johnny Handsome
<[email protected]<mailto:johnny%20handsome%20%[email protected]%3e>>
Reply-to: Johnny Handsome <[email protected]>
To: ZEN LB List
<[email protected]<mailto:zen%20lb%20list%20%[email protected]%3e>>
Subject: Re: [Zenloadbalancer-support] Enhancement request -Farm Monito
Date: Tue, 21 Feb 2012 07:50:35 -0500
Hi Nick,
I use nagios on a separate box, that I also use as my main access point to the
server farm (It use it as a "controller" workstation for awstats, nagios,
backup, update to the server web apps, etc)
very true point, the boxes can show all signs of "life", but something
unforseen or "mesaureable" has happened, can really turn your day ugly.
> Date: Tue, 21 Feb 2012 08:01:00 +0000
> From: [email protected]
> CC: [email protected]
> Subject: Re: [Zenloadbalancer-support] Enhancement request -Farm Monito
>
> Hi johnny
>
> Are you using nagios (within ZLB) to monitor servers or externally on another
> box.
>
> I would have been less bothered about monitoring, other than over the last
> few days I have seen a number of failures and ZLB disguises the fault,
> certainly on the summary screen. The beauty of a load balancer is to offer
> system continuity during a fault. But without useful warning/alerting this
> situation can be worse than a single server failure.
>
> Ta
> Nick
>
> Sent from my BlackBerry, sorry for the short reply.
> Nick
> -----Original Message-----
> From: "Johnny Handsome" <[email protected]>
> Cc: <[email protected]>
>
> Sent: 20/02/2012 23:19:42
> Subject: Re: [Zenloadbalancer-support] Enhancement request -Farm
> Monitoring/SMTP
>
> Hello,
>
> I would agree with Emilio and crew, it shouldn't be on zen to monitor the
> status of servers.
>
> I would recommend that a 2nd nic be but in servers and utilize that subnet to
> manage and monitor your servers.
>
> For example I have 3 nicks in each server
> 1 for the zen farm network
> 1 for my management access for the box
> 1 as a spare
>
> I also run nagios that monitors various aspects of each of my real servers
> and alerts me if there is a failure or issue with the box or a service on the
> box.
>
> So on my boxes I monitor the apache services and MySQL services.
>
> Johnny
>
> On 2012-02-20, at 1:39 PM, "Emilio Campos" <[email protected]>
> wrote:
>
> > Hi Nick, At the moment we aren't going to develope a method to indicate the
> > users that a backends or a farms are down. As Marco wrote in other mail it
> > is work for your monitoring solution. But by other hand I think that your
> > proposal of indicate the backend status (how many are dead, how many are OK
> > or how many are in maintenance mode) in the global farm view is very
> > interesting, we are going to try to develope in new version
> >
> > Regards!
> >
> > 2012/2/20 Marco Tiggelaar - Key4ce <[email protected]>
> > Actually.. "dedicated" monitoring's can be very cheap - and for those with
> > a Virtual environment --> you can run them with as little as 512 mb for
> > each.
> > That aside for me it's mostly what is required to send out mails (postfix
> > etc) that ups the resources (every bit counts ;))
> >
> > i do agree for some specially small environments it will be beneficial but
> > it should be some form of an option (if not for the resources then for
> > double mails on errors ;))
> >
> > For the colors part i really haven't got much of an idea yet.. we have only
> > experimented with zen for a little bit.. and are currently waiting for NAT
> > support.
> > (as anti-spam/ fail2ban/ etc can't work with sNAT so that means our servers
> > have to run less secure in case we want to use loadbalancer with sNAT at
> > this point - can't afford that with daily brute force attempts and 1000's
> > of spams ^^)
> >
> > Little side note: hopefully NAT will be supported before Juli (thats when
> > our new environment will launch.. hoping to do that with a zen loadbalancer
> > to go with it haha :)
> >
> > Regards,
> > Marco
> > --
> > Key4ce General Manager
> > ---------------------------------------------------
> > Phone NL: +31 (0)40 290 3310
> > Phone EN: +44 (0)1332 898 999
> >
> > Italielaan 9
> > Eindhoven
> > The Netherlands
> > ---------------------------------------------------
> > http://www.key4ce.com
> >
> > -----Original Message-----
> > From: Nick Furnell <[email protected]>
> > Reply-to: Nick Furnell <[email protected]>
> > To: [email protected]
> > Subject: Re: [Zenloadbalancer-support] Enhancement request - Farm
> > Monitoring/SMTP
> > Date: Mon, 20 Feb 2012 17:21:55 +0000
> >
> > Hi All I understand the concerns about overloading ZLB by adding monitoring
> > tools, and the benefits of using external 'dedicated' monitoring equipment
> > - but we are not large enough to have that level of monitoring, but benefit
> > massively from the load balancing ZLB offers. So a simple SMTP report on
> > exception changes to Farm status, 'real' server availability, FarmGuardian
> > triggers - would be helpful. Even if this SMTP feed can't cant be done, how
> > about a series of colours? We already have RED for OFF, GREEN for ON,
> > YELLOW for MAINTENANCE... how about BLUE for 'FarmGuardian fault'? I think
> > a quick the summary screen could also display a quick count - maybe a
> > percentage of 'availability' ? eg Example Farm A - 5 real servers, 1 in
> > maintenance mode, 1 with FarmGuardian fault -> would show 60% available
> > What do you think? 3 greens 1 yellow 1 blue Nick
> >
> > Transform Medical Group (CS) Limited.
> > Registered in England & Wales with Company Number: 3228476
> > Registered office: 192 Altrincham Road, Manchester M22 4RZ
> >
> > Transform Medical Group(CS) is registered in England and Wales, number
> > 3228476. The registered office is at 192 Altrincham Road, Manchester, M22
> > 4RZ. The information contained in this electronic message and any
> > attachments (the "Message") is intended for one or more specific
> > individuals or entities, and may be confidential, proprietary, privileged
> > or otherwise protected by law. If you are not the intended recipient,
> > please notify the sender immediately, delete this Message and do not
> > disclose, distribute, or copy it to any third party or otherwise use this
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>
> Transform Medical Group (CS) Limited. Registered in England & Wales with
> Company Number: 3228476 Registered office: 192 Altrincham Road, Manchester
> M22 4RZ Transform Medical Group(CS) is registered in England and Wales,
> number 3228476. The registered office is at 192 Altrincham Road, Manchester,
> M22 4RZ. The information contained in this electronic message and any
> attachments (the "Message") is intended for one or more specific individuals
> or entities, and may be confidential, proprietary, privileged or otherwise
> protected by law. If you are not the intended recipient, please notify the
> sender immediately, delete this Message and do not disclose, distribute, or
> copy it to any third party or otherwise use this Message. Electronic messages
> are not secure or error free and can contain viruses or may be delayed, and
> the sender is not liable for any of these occurrences. The sender reserves
> the right to monitor, record and retain electronic messages.
>
>
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