How to upgrade SOLR instance from 8.3 to 8.11.1

upgradeInstuctions.md

How to upgrade SOLR instance from 8.3 to 8.11.1

This is how I got the SOLR upgrade process to run. There was nothing else to run!

Steps

To upgrade I did the following:

1. Backup your data
2. Stop the solr service
3. Download the latest version
4. Ran the install script with the -f flag

Bash steps

Code steps to do this:

$ cp -r /var/solr/data /home/
$ cd /tmp
$ wget https://downloads.apache.org/lucene/solr/8.11.1/solr-8.11.1.tgz
$ tar xzf solr-8.11.1.tgz solr-8.11.1/bin/install_solr_service.sh --strip-components=2
$ sudo bash ./install_solr_service.sh solr-8.11.1.tgz -f 

This then ran the upgrade script and produced this output (server name specific to this instance upgrade):

Stopping Solr instance if exists ...


Extracting solr-8.11.1.tgz to /opt


Removing old symlink /opt/solr ...


Installing symlink /opt/solr -> /opt/solr-8.11.1 ...


Installing /etc/init.d/solr script ...


/etc/default/solr.in.sh already exist. Skipping install ...


/var/solr/data/solr.xml already exists. Skipping install ...


/var/solr/log4j2.xml already exists. Skipping install ...

Service solr installed.
Customize Solr startup configuration in /etc/default/solr.in.sh
● solr.service - LSB: Controls Apache Solr as a Service
   Loaded: loaded (/etc/init.d/solr; generated)
   Active: active (exited) since Tue 2022-05-10 22:19:30 UTC; 5s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 24304 ExecStart=/etc/init.d/solr start (code=exited, status=0/SUCCESS)

May 10 22:19:24 srvvp24-wa solr[24304]: *** [WARN] *** Your open file limit is currently 1024.
May 10 22:19:24 srvvp24-wa solr[24304]:  It should be set to 65000 to avoid operational disruption.
May 10 22:19:24 srvvp24-wa solr[24304]:  If you no longer wish to see this warning, set SOLR_ULIMIT_CHECKS to false in your profile or solr.in.sh
May 10 22:19:24 srvvp24-wa solr[24304]: *** [WARN] ***  Your Max Processes Limit is currently 31645.
May 10 22:19:24 srvvp24-wa solr[24304]:  It should be set to 65000 to avoid operational disruption.
May 10 22:19:24 srvvp24-wa solr[24304]:  If you no longer wish to see this warning, set SOLR_ULIMIT_CHECKS to false in your profile or solr.in.sh
May 10 22:19:30 srvvp24-wa solr[24304]: [194B blob data]
May 10 22:19:30 srvvp24-wa solr[24304]: Started Solr server on port 8983 (pid=24377). Happy searching!
May 10 22:19:30 srvvp24-wa solr[24304]: [14B blob data]
May 10 22:19:30 srvvp24-wa systemd[1]: Started LSB: Controls Apache Solr as a Service.

Solr is protected via rules and UFW from access by external sources.