Multiple Jenkins possible ? - quick question

[Z W]

Hi

We have one Jenkins configured and it went down.
Our only Jenkins as 3 slaves.
We like to install another Jenkins acting as secondary master for the
3 slaves nodes in case the primary master Jenkins goes down.

Will this configuration work ?
Can multiple Jenkins work together ?
How do we configure secondary Jenkins such that when primary Jenkins
goes down, it takes over ?
How would the slaves know that the secondary Jenkins is in service and
not the primary Jenkins.

Thanks for your help

[Clemens]

Hi,

do you want to install another Jenkins on the same Server ?
Not sure about this. Because this would be a problem with the
Jenkins Service, tried this once, and didnt get it running, because they
could not run at the same time.

There is a similar Thread "Hosting multiple Jenkins instance : Need Help
If i am getting your question correctly. At this thread they linked a Page
with maybe the same Point you are looking for.
(Link)
Maybe this will help you.
Tell me if there is a misunderstanding.

Greetings

[Mandeville, Rob]

You basically want a high availability solution. CloudBees sells that as part of Jenkins Enterprise (www.cloudbees.com/jenkins-enterprise-by-cloudbees-overview.cb). It's called the high availability plugin, and it's only for paying customers. I have never tried it, but have been eyeing Jenkins Enterprise for some time now.

--Rob

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[Coombesy]

If you have a spare server, you could setup a new master and front both the new and existing Jenkins master with Apache and have Apache handle the failover.

I'm not sure about how this would affect slaves, but in theory this should work, or at least it's an approach I have used albeit not with Jenkins, and would certainly be very quick to test the configuration on a single server to prove the theory (i.e. install Apache and two Tomcat instances and deploy Jenkins to both Tomcat instances).

[Z W]

Hi Clemens

Secondary would be running on a different server box was the idea.

[Les Mikesell]

On Tue, Nov 27, 2012 at 1:01 PM, Z W <mpc...@gmail.com> wrote:
> Hi Clemens
>
> Secondary would be running on a different server box was the idea.

Automatic fail-over adds a lot of complexity and a lot of new things
to go wrong. An easier approach would be a moderately frequent rsync
of the jenkins data to a backup server where you would manually change
the IP to the old one and start jenkins if your old server is
hopelessly broken.

If you really need up-to-the-second failover and want to roll your
own, you could probably do it on linux with drbd and corosync.


--
Les Mikesell
lesmi...@gmail.com

[Vojtech Juranek]

> Automatic fail-over adds a lot of complexity and a lot of new things
> to go wrong. An easier approach would be a moderately frequent rsync
> of the jenkins data to a backup server where you would manually change

you can also use e.g. NFS volume mounted to both slaves so that everything is
up-to-date without any need of synchronization. However, this all these
approaches aren't real HA - running jobs and all in-memory stuff will be lost

[Les Mikesell]

Right. But as a tradeoff, a 'warm' spare won't automatically be
broken by whatever it was that killed the active server (and maybe
deleted its files...). In most situations a failed build isn't a huge
problem. It is really the SCM that needs the best protection.

--
Les Mikesell
lesmi...@gmail.com

[Jerry]

It is also possible to maintain your Jenkins config files in source control. We could very quickly get a new instance of Jenkins up and running just by cloning our SCM repository to a new machine and dropping the Jenkins WAR in the right place.

But I have to second Rob Mandeville's suggestion to at least look into the Cloudbees high availability plugin.

-- Jerry

[Khai Do]

We use the Jenkins gearman plugin (https://wiki.jenkins-ci.org/display/JENKINS/Gearman+Plugin) to run jenkins in a multi master configuration.  That plugin is open source so no need to buy cloudbees solution. 

[Stephen Connolly]

[CloudBees Employee Hat]

I suspect it is the workflow addition that we have whereby the workflow can continue running *while* you restart the master that you are after... that is something that is more valuable in my mind than HA...

[/CloudBees Employee Hat]

[Fadi Al-Farah]

Hello, I am trying to use the Gearman Plugin but I have no idea how to set it up to make Jenkins as high-availibility(ish)...

[Zaro]

Well, there are instructions on the wiki. What have you tried?

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[Fadi Al-Farah]

Yes I've tried, the instructions from the wiki. I'm at the point where I'm trying to setup a gearman server, but I don't think it's running. (When I try to Test the connection from Jenkins, it fails).

Is there a tutorial out there that has a walkthrough on how to get it setup to make Jenkins HA?

[Zaro]

it's in the wiki, in 'configuring multiple jenkins masters section'.

> https://groups.google.com/d/msgid/jenkinsci-users/4f52b480-345d-4ee4-b929-cc921064ef01%40googlegroups.com.

[Fadi Al-Farah]

Thank you, I've managed to get things working! :)

[suresh kumar]

Hi Fadi,

Can you share me steps how you configured gearman and multiple master jenkins 

[guoji...@bytedance.com]

hi, do you know how to configure multi gearman server hosts in "Gearman Plugin Config"? it seems that it can only be configured one.

在 2015年7月15日星期三 UTC+8上午2:20:53，Khai Do写道：