Thank you very much for all the help and pointers (yes some slave issues 
did surface needing latest Java quickly resolved the issues.)
Here is the report of my upgrade:
1: it was seamless no issues faced. 
2: Upgraded all the plugins. 
3: Minor issues faced related to Jococo plugin and some lost credentials 
which had to be reselected from drop down for Jenkins build success or 
failure notification to Stash\ Bitbucket 
4: some slack api access keys configuration were lost. 
5: had to change this for  /etc/sysconfig/jenkins 
help from : 
http://stackoverflow.com/questions/38157686/migrating-to-jenkins-2-1-ajp-support-is-removed-in-winstone-3-0-due-to-jetty-9
JENKINS_AJP_PORT="-1"

But over all nothing that could be called a show stopper. 

I am \ will be for ever indebted to authors \ maintainers \ supporters of 
this software. Without you guys i am not sure where we would have been. 

regards,
Raj

On Wednesday, March 1, 2017 at 4:01:04 AM UTC-5, Baptiste Mathus wrote:
>
> Right, sorry, I misunderstood, I assumed Raj was using Java 7 VM for 
> running Jenkins already, but he didn't tell this part.
>
> @Raj: if you're still using a JDK6, then yes, you better indeed upgrade 
> everything to JDK8 while in the go. If already using JDK7, then you should 
> be fine, but you want to plan to upgrade to JDK8 everywhere probably also 
> while at it to avoid headaches with the upcoming baseline upgrade (next 
> month for first weekly, early June for first LTS requiring Java 8).
>
> 2017-02-27 20:32 GMT+01:00 Peter McNab <[email protected] <javascript:>>
> :
>
>> No to what?
>>
>> Jenkins 1.608 made slaves require Java7, so it might impact Raj's upgrade 
>> attempts.
>>
>> I know the Java8 change hasn't been made, but it's coming soon as well.
>>
>> Java7 has been around a long time, but so have the platforms I support, 
>> and we we moved up to a version that supported pipelines a number of the 
>> older platform slaves stopped working and some users had to scramble to 
>> adjust their jobs.
>>
>> Pete
>>
>> On 2/27/2017 11:16 AM, Baptiste Mathus wrote:
>>
>> Well, no. The Java 8 change hasn't been made yet, though it is coming 
>> according to the announced plan (first weekly should be on April, and first 
>> LTS requiring it should be around early June). And Java 7 has been around 
>> for a long time. 
>>
>> And we already discussed the fact that though some platforms may not have 
>> a JDK packaged with std distro, it's dead simple to download it directly 
>> from , uncompress and be done with it on the big majority of platforms 
>> (Centos 6 is not an issue at all for instance, I can relate).
>>
>> 2017-02-27 19:29 GMT+01:00 Peter McNab <[email protected] <javascript:>
>> >:
>>
>>> I don't remember exactly when the change was made, but keep in mind that 
>>> Java7 is required for slave nodes with recent versions of Jenkins.  If you 
>>> have slave nodes without that available they will be dead in the water.
>>>
>>> Pete
>>>
>>> On 2/27/2017 9:59 AM, Raj wrote:
>>>
>>> Thank you for the feedback.  
>>>
>>> Sure. we can do that and more simply with a vm snapshot for rollback.  
>>>
>>> but in case of staging upgrade how do you propose \ suggest to manage 
>>> the slave \ agents ? i ask since if i bring up the staging with a rsynced 
>>> config then the agents will try to connect too and might cause a issue. or 
>>> should we just make all slaves offline when i take a snaphot so when they 
>>> do comeback they will be not connected to the master and that way we can 
>>> test just the master and once it is fine then just connect all agents to 
>>> the new server ?
>>>
>>>
>>>
>>> On Saturday, February 25, 2017 at 1:35:25 PM UTC-5, Raj wrote: 
>>>>
>>>> Hello, 
>>>> We have been stuck to a very old version of Jenkins for a while now. 
>>>> 1.580. we are on Centos 6.
>>>>
>>>> I am wondering if any one has upgraded from 1.580 to 2.32.2 via yum and 
>>>> including all plugins ? 
>>>>
>>>> If someone could share their experience it will be really appreciated. 
>>>>
>>>> apart from need for jdk 1.8, is there any other hard dependency for the 
>>>> upgrade?
>>>> Regards,
>>>> Raj
>>>>
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