Re: Update OpenNMS from 20.0.1 to 21.0.3 on CentOS 7

Hi Jason,

    The following pages might help you:

https://wiki.opennms.org/wiki/Upgrade_Guide:_20_to_21   (This isn't 
really a guide but lists all the config files which change and known-issues)

Personally I've found upgrading OpenNMS to be a very painful and 
laborious process - You'll need to keep backups of all your customised 
XML configuration files from /etc/opennms and then re-apply those 
changes once the new version is installed. If you're lucky it will be a 
simple case of copying the old files back into place, but you then risk 
losing useful and/or important default changes from the new version.

You'll almost certainly want to do a backup  - this is documented here: 
https://wiki.opennms.org/wiki/Backup_and_Restore

After updating the OpenNMS packages, the installer will take care of 
updating the database etc...

${OPENNMS_HOME}/bin/install -dis  (From: 
https://docs.opennms.org/opennms/releases/21.0.3/guide-install/guide-install.pdf 
)

In my personal opinion, I would not bother trying to upgrade but instead 
would rebuild from scratch and apply any custom config. The setup I run 
is fully automated using puppet - it took a fair bit of work but I just 
build a new virtual machine, run puppet and then OpenNMS automatically 
populates by doing a zone transfer from our DNS. Crucially in our case 
we don't care about losing historic stats which may be a different 
situation for you. As I write I'm upgrading from 21.0.2 to 21.0.5 in 
exactly this way.

Hope this helps - Good luck!
Jonathan

On 09/04/18 20:46, Jason Burgess wrote:
> Hello,
>
>   I'm fairly new to OpenNMS as well as Linux... I installed 20.0.1 
> around maybe 8 months ago and I want to update it to the latest 
> version.  Unfortunately I'm not seeing any specific guides for this.  
> It looks like I need to update PostgreSQL as well (I'm on 9.2 and 
> would like to go to 10.x) but again, I'm not entirely sure how this 
> making changes to the database could impact the installation.
>   Is there a walkthrough I'm missing?  If I do a Yum Update opennms, 
> will that include the dependencies?  Will it migrate the DB to the 
> newer instance, leaving the data intact?
>
>   Thank you.
>
>
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