Upgrading between EPrints 3.4 versions

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Revision as of 09:40, 19 April 2021 by Drn@ecs.soton.ac.uk (talk | contribs) (Added first complete draft of upgrade instructions using source tarball.)
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This page is intended to provide guidance for those upgrading between versions of EPrints 3.4. (e.g. 3.4.1 to 3.4.2). This is generally intended for those upgrading using source tarballs available on files.eprints.org or upgrading tagged release from EPrints 3.4 GitHub repository. However, if you are upgrading through EPrints Deb or RPM package repostories and you experience issues this page should also contain helpful advice.

General Advice

If you are running EPrints as a virtual machine, then it is worthwhile taking a snapshot that your could revert back to this in the event of an unsuccessful upgrade. Otherwise, you should take the following backups before starting an upgrade:

The EPrints database
This will likely have the same name as the archive.
The documents directory
This is the documents directory, directly under the archive's directory (i.e. <EPRINTS_PATH>/archives/<ARCHIVE_NAME>/).
The Xapian index
This is in the var directory of the archive under the directory named or starting xapian.
Your EPrints archive
All the directories and any files in your archive, except: documents (see above), html and var (except xapian, see above). If you have multiple archives be sure to backup each one.
The current EPrints codebase
In case any changes have been made to this. These may be needed if you have to rollback an upgrade or also apply these changes if they are needed in the upgraded version of EPrints. All directories in the EPrints path (e.g. /opt/eprints3/ or /usr/share/eprints/) should be backed up except: archives (see above), debian, license, pod, testdata, tests,tmp and var. No files in the top level EPrints path directory need to be backed up.

Again, if you have the ability to take a virtual machine snapshot of your EPrints repository, it is worth using this to produce a clone, (if you do not already have a test or pre-production server version of your EPrints repository). This will allow you to check if you will have any snags either with the upgrade process or with the upgraded repository itself. It should also allow you to refine your upgrade schedule for your live EPrint repository to reduce the amount of scheduled downtime required.

Upgrade Schedules

It would be expected that you have scheduled downtime (at least a day) and ideally try out the upgrade schedule on a cloned instance of your EPrints repository. If you tested the upgrade schedule on a clone, actually downtime may end up being an hour or less.

From a source tarball

N.B. This instructions are a work in progress. 1. Download the source tarball for both your current version of EPrints (e.g. 3.4.1) and your intended new version (e.g. 3.4.3) from files.eprints.org and unpack into a separate directory on your EPrints repository server. E.g.

tar -xzvf eprints-3.4.1.tar.gz /home/eprints/
tar -xzvf eprints-3.4.1-flavours.tar.gz /home/eprints/
tar -xzvf eprints-3.4.3.tar.gz /home/eprints/
tar -xzvf eprints-3.4.3-flavours.tar.gz /home/eprints/

2. Compare the code to see if any critical changes have been made to the core codebase:

diff -x archives -x cfg -x tmp -rq /opt/eprints3 /home/eprints/eprints-3.4.1 | grep -v "/\(flavours/pub_lib/inc\|ingredients\|var\)"

3. If the are any changes check to see if the change is present in the new version of EPrints:

diff /opt/eprints3/lib/lang/en/phrases/system.xml /home/eprints/eprints-3.4.1/lib/lang/en/phrases/system.xml
diff /opt/eprints3/lib/lang/en/phrases/system.xml /home/eprints/eprints-3.4.3/lib/lang/en/phrases/system.xml

If the change is the new version then there is no need to replicate this change, if it is not you need to consider whether then change can/should be made to the new version.

4. If you repository has any Bazaar plugins installed go to the Eprints Bazaar page on your repository via the Admin menu and download each one individually from the Developer Tools tab.

5. Stop the webserver and EPrints indexer on your repository server and check they have stopped runningh:

systemctl stop httpd
ps aux | grep httpd
/opt/eprints3/bin/indexer stop
ps aux | grep indexer

httpd is for RHEL-based Linux OS, for Debian-based Linux OS use apache2.

6. As root, move the new version of EPrints (with any ported changes, from step 3) to /opt/eprints3-new

mv /home/eprints-3.4.3 /opt/eprints3-new

7. As the eprints user move the contents of the current archives to /opt/eprints3-new:

mv /opt/eprints3/archives/* /opt/eprints3-new/archives/

If /opt/eprints3/archives or any of its archives are on a different disk partition, this may take a long time and the partition you are moving it to may not be big enough. It may be better to figure out an alternative way of updating the other EPrints directories without moving the archive between disk partitions and then switching round the eprints directories (step 9 below).

8. As the eprints user copy across ingredients (except the bazaar ingredient) to the new version:

rsync --exclude=bazaar /opt/eprints3/ingredients/* /opt/eprints3-new/ingredients/

9. As root, switch round the old and new eprints directories:

mv /opt/eprints3 /opt/eprints3-old
mv /opt/eprints3-new /opt/eprints3

10. As the eprints user, test EPrints is in a good state:

/opt/eprints3/bin/epadmin test

If you have various Bazaar plugins installed, it is likely that this will report issue. If so you will need to disable these files until you can re-install the Bazaar plugins. E.g. cd /opt/eprints3/archives/<ARCHIVE_NAME>/cfg/cfg.d/ rm ../epm/* mv z_orcid_support.pl z_orcid_support.pl.disabled mv zz_hefce_oa_fields.pl zz_hefce_oa_fields.pl.disabled mv zz_rioxx2.pl zz_rioxx2.pl.disabled mv z_meprints.pl z_meprints.pl.disabled mv kultur.pl kultur.pl.disabled

11. Assuming EPrints is (now) in a good state, regenerate EPrints' Apache configuration:

/opt/eprints3/bin/generate_apacheconf --system --replace

12. Check the Apache configuration is sound and restart the webserver@

apachectl configtest
systemctl start httpd

For Debian-based LinuxOS use:

apache2ctl configtest
systemctl start apache2

13. Load up your repository in a web browser, login and go to the EPrints Bazaar page via the Admin menu. Install all the Bazaar plugins you downloaded in step 4. You can do this by scrolling to the bottom of the Available tab and using the Upload and Install section. Once you have re-installed all the Bazaar plugins, you can move back all the files you disabled in step 10. Then use epadmin to re-test and restart the webserver:

/opt/eprints3/bin/epadmin test
systemctl start httpd

14. Now using your web browser do a thorough test of both the functionality and the appearance/layout of your repository and make tweaks to your local archive configuration as necessary (e.g. modify the CSS).

13. Finally, as the eprints user, restart the indexer.

/opt/eprints3/bin/indexer start

It is advised that you keep the /opt/eprints3-old directory for a while (at least a month) in case you spot any unexpected problems. Worse case scenario you can revert back to this version by doing steps 7 and 9 in reverse. However, typically it useful as a reference if your forgot to port a bespoke core code change your old version of EPrints or a change you did port does not work as expected.

From GitHub release

N.B. This instructions are a work in progress. 1. Check that no critical files have been modified in the core codebase.

cd /opt/eprints3/
git status

The only file that should have been modified (assuming you are running a publications flavour of EPrints) is flavours/pub_lib/inc.

There may be various new directories/files under the lib and ingredients directories. These will most likely have been created as a result of installing Bazaar plugins or EPrints ingredients. You should make a note of these and check to see that they are present after the upgrade schedule has been completed.

If there are modified files (according to git status), you should similarly make a note of these and the changes made, so it can be checked if either these changes have already been applied in the upgraded versions of these files or that they need to be re-applied after upgrading.

If git status finds and missing files, then similarly these should be checked to make sure they are not present after completing your upgrade and remove them if they are. They were most likely removed to deliberately disable a piece of unwanted functionality. Although generally it should be possible to disable this with configuration.

2. ...

From Linux package repository

N.B. This instructions are a work in progress.