How To Upgrade Postgresql Database From 10 To 12 Without Losing Data For Openproject

“Upgrading your PostgreSQL database from 10 to 12 for OpenProject can be accomplished seamlessly without data loss, ensuring optimal performance and efficiency for your open source project management platform.”Upgrading Postgresql database from version 10 to version 12 without data loss for OpenProject necessitates several key steps. For those unfamiliar, OpenProject is an open source project management software which heavily relies on databases such as Postgresql for storing its wide-ranging data.

Here is a simple summary table highlighting the key steps:

Step	Action
Backup of Database	Create a backup of your Postgresql database using pg_dump command.
Installation of Version 12	Install Postgresql 12 alongside the older version without removing it. Utilize the official PostgreSQL repository for a smoother install process.
Configuration	Configure the newly installed Postgresql 12 to listen to a different port from the running version 10.
Data Migration	Use the pg_upgrade utility bundled with Postgres package to migrate data from the older version to the newer one. This tool helps to achieve an in-place upgrade without requiring additional disk space.
Update Connection	Once all data has been successfully migrated, change OpenProject’s database connection setting to point at the new Postgresql 12 instance.
Test	Lastly, test your OpenProject installation to ensure everything is running smoothly.

Whilst the step-by-step guide provided simplifies the process, keep in mind that each stage of upgrading Postgresql is critical to maintaining data integrity and ensuring seamless productivity with OpenProject. Initiating with a comprehensive backup safeguards your data against any unforeseen circumstances. Installing the updated Postgresql version amidst still keeping the existing one aids in preserving the older version’s configurations and standards if required. The convenient utility

pg_upgrade

, offered by Postgresql, makes the data migration process between versions hassle-free. Finally, configuring OpenProject to work doesn’t merely stop at successful data migration. One must carefully validate their application in totality by executing typical user actions to ascertain overall operational functionality after the upgrade. Hence the testing phase cannot be overstated, and ample time should be dedicated to this process.

Additional details and caveats regarding upgrading PostGREsql can be found in PostGREsql’s official documentation. Do not gloss over the specific requirements and limitations outlined there while performing an upgrade, as these points can vary significantly between different PostGRESQL versions – ensuring a solid understanding here can save considerable time and headaches down the road.Upgrading PostgreSQL database from version 10 to 12 without losing any data is pertinent especially for applications like OpenProject that depend heavily on databases. This process involves several detailed steps such as:

– PostgreSQL Installation: This involves installing the new PostgreSQL version, which is version 12 in this case. You can download the latest version of PostgreSQL from their official website.

Here’s how you would install it from terminal:

sudo apt-get update

sudo apt-get install postgresql-12

– Data Backup: The next step would be backing up your existing data using the `pg_dump` command built-in PostgreSQL, to avert irreversible loss.

Example usage of pg_dump would be

pg_dump openproject -U postgres -W -F t > /tmp/openproject_backup.tar

– Stop the OpenProject service: This ensures applications don’t access the database during the upgrade. You would use:

sudo openproject stop

– Upgrading the Database Cluster: The next step involves upgrading the database cluster itself from PostgreSQL V.10 to V.12.

This is typically done through the following command:

sudo pg_upgradecluster 10 main

– Testing: After the operation is concluded successfully, ensure to test and verify that the database is working perfectly fine with the new server before proceeding.

Remember to restart OpenProject:

sudo openproject start

– Removing the older version: The final step involves removing the older PostgreSQL version only after confirming that everything works perfectly fine with the newer one using the command:

sudo apt-get remove postgresql-10

This process may induce just a slight downtime depending upon the data size and computing power.

However, it’s extremely essential to note that since these operations essentially involve irrevocable changes (like deleting the older database version), one must understand them thoroughly or seek professional help. The official PostgreSQL documentation provides an exhaustive set of instructions on this topic. For data integrity, always backup important data before proceeding with the upgrade process. Relying on professional support or comprehensive managed database services could indeed be beneficial to safeguard your valuable data during crucial procedural upgrades like these.

One of PostgreSQL’s strengths is in its ability to upgrade from one version to another without significant risk of data loss. Even with this reassurance, a practical and systematic pre-upgrade checklist is essential when upgrading your PostgreSQL database from version 10 to 12 for Openproject.

1. Check for PostgreSQL Version:
To check the current PostgreSQL version you are running, use the following command:

SELECT version();

being sure of the version you’re currently using is important to know what postgreSQL features are available or deprecated.[Ref]

2. Backup Your Data:
Always remember, any operation that has potential to alter database content, should be preceded by comprehensive backups. Use the ‘pg_dump’ utility built into PostgreSQL for this purpose:

pg_dump openproject_prod > openproject_prod_v10.sql

This command will backup “openproject_prod” database contents in ‘openproject_prod_v10.sql’. Always test your backups before initiating an upgrade.

3. Verify Available Disk Space:
The pg_upgrade utility requires space approximately twice the size of your existing database. You can use the command below to determine the disk usage of your current PostgreSQL installation:

du -sh /var/lib/postgresql/10/main

Ensure you have enough disk space before proceeding with the upgrade.[Ref]

4. Undergo Compatibility Checks:
In your code base, look out for functionalities that have been deprecated between your current version (10) and the target version (12). A good starting point is the official PostgreSQL documentation.

5. Plan for Downtime:
While pg_upgrade reduces downtime, there will still be a period where your database is inaccessible. Carefully plan this time and ensure your users are aware and adequately prepared.

6. Prepare for Rollback:
Even with careful planning, it’s prudent to prepare for unsuccessful scenarios. Ensure that you can quickly restore your backup and restart your server in such cases.

With these checks, you are well equipped with a sound pre-upgrade plan. Be sure to follow through and conscientiously execute each step. Database upgrades, though tasking and complex, need not be a time of apprehension for developers. Instead, with careful planning and adherence to best practices, these become opportunities to optimize database performance and security.

Pre-Upgrade Step	Commands
Check for PostgreSQL Version	SELECT version();
Backup Your Data	pg_dump openproject_prod > openproject_prod_v10.sql
Verify Available Disk Space	du -sh /var/lib/postgresql/10/main
Undergo Compatibility Checks	No commands for this step, review the official PostgreSQL 12 documentation
Plan for Downtime	No commands for this step, communicate accordingly with end users.
Prepare for Rollback	Make sure the team is ready to restore the database if needed.

One of the crucial procedures you need to perform before conducting a significant upgrade, such as upgrading PostgreSQL from 10 to 12 for OpenProject, is backing up your data. Backups are notoriously regarded as insurance for your system in case unforeseen issues arise during the upgrade process that could potentially lead to data loss.

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Backup Strategies: Protecting Your OpenProject Data

A well-implemented backup strategy will act as a safeguard, protecting your OpenProject data during an upgrade of the PostgreSQL database. Here’s our robust guideline:

• Data Backup: The command below can be used in a Linux-based operating system to create a backup of all your databases:

    pg_dumpall > /var/lib/postgresql/dumpfile

• Location Strategy: Ensure that the backup dumpfile is not kept on the same server or same disk where the original data reside. If the whole disk fails, you would lose your backup along with your original data.
• Frequency of Backups: The frequency at which you conduct backups depends on how often your data changes or gets updated. If your data changes dynamically and rapidly, more frequent backups are recommended.
• Rehearse the Restoration Process: Regularly test the restoration process of your backups. This ensures that your backup works as expected in real recovery scenarios.

Upgrading PostgreSQL Without Losing Data

Preserving data integrity while upgrading PostgreSQL from version 10 to 12 is a primary concern.

You can follow the steps below to safely transition from PostgreSQL 10 to PostgreSQL 12:

• Install PostgreSQL 12: Begin by installing the new version parallel to your current version.
• Run ‘pg_upgrade’: Use the

  pg_upgrade

  utility provided by PostgreSQL. This tool helps to migrate data and configurations from the old database system to the new one.

   sudo su - postgres
   /usr/lib/postgresql/12/bin/pg_upgrade \
   -b /usr/lib/postgresql/10/bin \
   -B /usr/lib/postgresql/12/bin \
   -d /var/lib/postgresql/10/main \
   -D /var/lib/postgresql/12/main \
   -O " -c config_file=/etc/postgresql/12/main/postgresql.conf" \
   -o "-c config_file=/etc/postgresql/10/main/postgresql.conf"

• Reindex the System Catalogs: Post-upgrade, reindexing your system catalogs is highly recommended as it helps in reclaiming storage and enhances the performance of your system. Run this line of code:

   reindexdb --all

This approach ensures that your OpenProject data remains secure while upgrading your PostgreSQL database. Given the importance of your project data, remember to always prioritize a solid data protection plan and review your backup strategies regularly.

For a more comprehensive guide on PostgreSQL data backup and restore, visit the official PostgreSQL documentation here – [PostgreSQL Documentation](https://www.postgresql.org/docs/current/backup.html).Upgrading your PostgreSQL database from version 10 to 12, especially when you use it for an OpenProject instance can be a daunting task. But, with careful planning and execution, it’s perfectly manageable and helps you tap into the benefits of the newer version without the fear of losing any data. Below is a detailed procedure:

Firstly, install the new version of PostgreSQL:

sudo apt-get install postgresql-12

Once all the binaries are in place, now let us clone the existing databases to the newer version using the ‘pg_upgrade’ utility provided by Postgres:

Step 1: Start the services for both databases

Start the new server service:

sudo systemctl start postgresql@12-main

Then, start the old server service:

sudo systemctl start postgresql@10-main

Step 2: Configure the new PostgreSQL (version 12) database to match the settings of the database you’re migrating from:

Set the same port number:

sudo nano /etc/postgresql/12/main/postgresql.conf

And add the following line under ‘CONNECTIONS AND AUTHENTICATION’:

port = 5433

Finally, restart the new PostgreSQL 12 service:

sudo systemctl restart postgresql@12-main

Step 3: Perform the upgrade with ‘pg_upgrade’

First, switch user to the postgres account:

sudo su - postgres

After the switch, perform below commands to upgrade PostgreSQL:

/usr/lib/postgresql/12/bin/pg_upgrade \
--old-datadir /var/lib/postgresql/10/main/ \
--new-datadir /var/lib/postgresql/12/main/ \
--old-bindir /usr/lib/postgresql/10/bin/ \
--new-bindir /usr/lib/postgresql/12/bin/

Upon successful execution, it will display a summary stating that clusters are compatible.

Step 4: Verification and Housekeeping

Finally, before going back to the production environment, let’s do some verification and housekeeping. Run the command generated by the script named ‘analyze_new_cluster.sh’. The script will optimize the data in our new cluster:

./analyze_new_cluster.sh

Running this script might take longer depending on your database size but is crucial since it updates the statistics used by the PostgreSQL query planner.

Also, don’t forget to delete the old cluster using the command provided by pg_upgrade as ‘delete_old_cluster.sh’ once you’ve confirmed everything works fine in the new version. Clean up unnecessary files afterwards.

Step 5: Restart the OpenProject instance

To ensure OpenProject properly connects to the newly upgraded database, remember to restart its instance. Depending on how OpenProject was installed, the exact command might be different. If OpenProject was installed through ‘packager’, restarting would be as simple as:

sudo openproject restart

Please note that the upgrading process might vary slightly for different OS distributions or PostgreSQL installation methods, however, the general approach as described above remains valid.

For official references, please refer to these links;
Official PostgreSQL upgrading guide,
Official OpenProject documentation,
Upgrading a PostgreSQL database from version 10 to 12 without losing the data for OpenProject can present several challenges. In order to overcome these challenges, it’s essential to carefully plan and execute the upgrade process. This guide will help you navigate through this process.

Potential Challenge#1: Data Loss

One of the primary concerns when upgrading any database is the potential loss of data. To mitigate this risk in PostgreSQL:

pg_dump -U postgres -W -F t openproject > ~/openproject_backup.tar

This command creates a backup copy of your OpenProject database. Next, after installing PostgreSQL 12, you’ll create a new database and restore your backup into it:

pg_restore -U postgres -W -d openproject_new < ~/openproject_backup.tar

However, this simple process does not come without its own set of challenges.

Potential Challenge#2: Compatibility Issues

If not handled properly, compatibility issues between different versions of PostgreSQL may arise. Should an object or a feature from PostgreSQL 10 become depreciated or permanently removed in PostgreSQL 12, you may encounter problems restoring your backup. A comprehensive list of such changes can be found in the release notes.

Thankfully, pg_dump produces output that is compatible with newer servers, meaning you're less likely to run into compatibility issues.

Potential Challenge#3: Downtime

Upgrading PostgreSQL could cause some amount of downtime, which could be unacceptable in many production environments.

To overcome this, consider using the pg_upgrade utility. This tool accomplishes an in-place upgrade, meaning your new version replaces the old one directly without needing to migrate data between the two:

pg_upgrade -b /usr/bin -B /usr/postgresql/12/bin/
           -d /var/lib/postgresql/10/data -D /var/lib/postgresql/12/data
           -o '-c config_file=/etc/postgresql/10/main/postgresql.conf'
           -O '-c config_file=/etc/postgresql/12/main/postgresql.conf'
		   --check

The configuration files for both versions are specified in the -o and -O options respectively. The final --check flag tells pg_upgrade to perform a test run. If no errors are reported, you can remove this flag to perform the actual upgrade.

Potential Challenge#4: Security Considerations

It’s worth noting that security measures from your old installation might not be immediately effective in the new setup. For instance, you might have scripts and triggers that depend on certain permission settings that need to be correctly mapped in the new installation:

REVOKE ALL ON schema_name.table_name FROM unwanted_user;
GRANT SELECT, INSERT, UPDATE, DELETE ON schema_name.table_name TO desired_user;

Lastly, always db-link all external databases, ensure no port is left open unintentionally, and check your logs regularly.

Challenging as it may be, planning is everything when upgrading a PostgreSQL database. Ensuring data integrity, addressing compatibility issues, minimizing downtime, and accounting for security considerations, are all critical points that, once addressed, will lead to a successful upgrade venture.

Sources:
PostgreSQL Official Documentation
OpenProject Configuration GuideUpgrading PostgreSQL database from version 10 to 12 for OpenProject can be a challenging task but it doesn’t have to result in data loss if performed carefully. If you want to maintain your project operations smoothly, ensuring the seamless compatibility of PostgreSQL with Openproject is crucial.

To begin with, assess the PostgreSQL version compatibility with Openproject. As a rule of thumb, OpenProject supports PostgreSQL 9.4 and later [1]. Therefore, versions 10 and 12 are both compatible. However, some new features introduced in PostgreSQL 12 might not be fully supported by all versions of OpenProject, so always check the specific version information.

As we get into the upgrading process, let’s highlight that several methods of upgrading PostgreSQL exist, such as pg_dump, pg_upgrade, or using logical replication. Each method has its own pros and cons, considering aspects like service downtime, the ease of process, the probability of data loss, and necessary disk space. But for this answer, we will focus on the pg_upgrade method, due to its advantages like minimal downtime and direct ‘in-place’ upgrade [2].

This essentially involves following these steps:

1. Install the newer PostgreSQL version alongside the old one without removing it.
2. Initiate a new PostgreSQL 12 cluster.
3. Run the pg_upgrade command specifying the old and the new data directories and executables.
4. Upon completing the upgrade, adjust the service file to start the new version of PostgreSQL instead of the old one.

Here’s a brief representation of what the pg_upgrade command could look like:

/usr/lib/postgresql/12/bin/pg_upgrade \
  --old-datadir /var/lib/postgresql/10/main \
  --new-datadir /var/lib/postgresql/12/main \
  --old-bindir /usr/lib/postgresql/10/bin \
  --new-bindir /usr/lib/postgresql/12/bin

Just remember to replace actual paths according to your setup, if they’re different. Keep in mind that both installations need to run under the same user account, usually “postgres”.

By following these points, upgrading PostgreSQL while retaining existing data for Openproject comes down to careful planning and execution. It’s always safe to backup your data before performing any major changes as a fallback security measure.

Just to remind – always make sure to consider the specific version details of both PostgreSQL and Openproject to ensure their efficient synergy and smooth operations during and post the upgrade process.

Also, refer to the comprehensive PostgreSQL documentation or consult experts on platforms like StackOverflow [3] for complex troubleshooting or doubts related to your unique system setup and upgrade requirements. The key lies in getting familiarized with major step implications, understanding potential risks, and striking an informed balance between system performance needs, downtime preferences, and available technical resources.

mv /usr/local/var/postgres /usr/local/var/postgres.old

/usr/lib/postgresql/12/bin/initdb -D /var/lib/postgresql/12/main/

pg_upgrade --old-bindir=/usr/lib/postgresql/10/bin --new-bindir=/usr/lib/postgresql/12/bin --old-datadir=/var/lib/postgresql/10/main --new-datadir=/var/lib/postgresql/12/main --check

sudo systemctl stop postgresql@10-main.service

sudo -u postgres /usr/lib/postgresql/12/bin/pg_upgrade –d /var/lib/postgresql/10 –D /var/lib/postgresql/12 –b /usr/lib/postgresql/10/bin –B /usr/lib/postgresql/12/bin –v

ln -s /usr/lib/postgresql/12 /usr/lib/postgresql/

sudo systemctl start postgresql@12-main.service

Let’s start off right after you’ve completed the PostgreSQL upgrade process, from version 10 to 12, specifically for OpenProject.

Here comes the task of confirming. It primarily encapsulates two aspects:

1. Ensuring that the PostgreSQL version has been upgraded.
2. Confirming that no data loss has transpired during the migration process.

Checking PostgreSQL Version

It is a fairly simple procedure. You can easily verify your PostgreSQL version by running a specific command in the PostgreSQL shell, as below:

SELECT version();

A message similar to the following will confirm that your upgrade to PostgreSQL 12 was successful:

PostgreSQL 12.2 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-11), 64-bit

Confirming Data Integrity

Verifying that no data was lost during the database migration process involves a more detailed examination. Here are some pointers for checking:

• You could count the number of rows in all tables before and after the upgrade using the following query:

  SELECT schemaname || '.' || relname AS "relation", 
         pg_size_pretty(pg_total_relation_size(C.oid)) AS "total_size"
  FROM pg_class C
  LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace)
  WHERE nspname NOT IN ('pg_catalog', 'information_schema')
        AND C.relkind <> 'i'
        AND nspname !~ '^pg_toast'
  ORDER BY pg_total_relation_size(C.oid) DESC
  LIMIT 20;
  

  If the counts match for all tables, this gives a strong indication that there was no data loss.

• It’s not just about quantity, but also quality. Take random samples of your data both pre and post-upgrade, and manually compare them to ascertain data integrity.

Remember, it’s crucial you have a backup of your original database prior to performing the upgrade. If you discover discrepancies or losses after upgrading, you can revert to your backup or use it for discerning differences.

Consider visiting online forums, blogs, articles, and consulting PostgreSQL’s official documentation for expounding upon these queries, their outputs, handling exceptions, etc. Some good places to include are Stack Overflow, PostgreSQL’s Official Documentation, among others.

Let’s remember, though, PostgreSQL migrations might need careful oversight because database management entails responsible handling.

Hope these steps assist you with confirming the successful upgrade of Postgres DB and verifying the data accuracy post upgrade! Happy coding!Before diving directly into the process, it is essential to understand why maintaining data integrity is of utmost significance during an upgrade. Data integrity refers to the accuracy, consistency and reliability of data during its entire lifecycle. Data integrity maintenance ensures that the organization’s data remains intact and unaltered, providing a reliable source of information for decision-making processes.

In the context of upgrading PostgreSQL database from version 10 to version 12 for OpenProject, maintaining data integrity means ensuring that the data from the older version (PostgreSQL 10) is correctly transferred and available in the newer version (PostgreSQL 12). The upgraded system should have the same data with all the associations and relationships preserved. This goal can be achieved by following these steps, all aligned with industry best practices:

1. Create a Full Database Backup

Firstly, before initiating any form of data migration or upgrade, it is crucial to backup the existing data. Having a complete backup mitigates risks associated with unplanned downtime or data loss during the upgrade process.

You can use the

pg_dumpall

command to create a complete backup. Here’s a simple example:

 pg_dumpall -U postgres -h localhost -p 5432 > backup.sql 

2. Install the New PostgreSQL Version

Next, install the new PostgreSQL version alongside the current version without overwriting it. By doing this, you can reduce the system’s downtime during the upgrade process, ensuring seamless operation.

See also



Linux

Ive Already Setup The Ssh Key

To install PostgreSQL 12, execute the following command:

 sudo apt-get install postgresql-12 

Note that the updater may complain about the configuration files needing updates; accept the maintainer’s defaults to proceed.

3. Use the pg_upgrade utility

After installation, utilize the

pg_upgrade

command-line utility to upgrade your PostgreSQL database. This utility allows the in-place upgrade of the system catalog while keeping user data intact. The utility makes sure that tables, indexes, views, and procedures are copied to the newer version without any change in data, thus ensuring data integrity.

The example code snippet for using the pg_upgrade utility is as follows:

sudo su - postgres
/usr/lib/postgresql/12/bin/pg_upgrade \
  --old-datadir /var/lib/postgresql/10/main \
  --new-datadir /var/lib/postgresql/12/main \
  --old-bindir /usr/lib/postgresql/10/bin \
  --new-bindir /usr/lib/postgresql/12/bin

Upon execution, pg_upgrade completes the upgrade process, facilitates version compatibility, and ensures comprehensive data integrity on transition.

Remember, each repair or update process always comes with the potential risk of data loss. However, by following these click-and-go steps, you will keep your PostgreSQL database upgrade smooth and ensure complete data integrity. Always take sufficient precautions and conduct extensive testing before making changes in business-critical production environments. By rigorously adhering to these proactive measures, we can mitigate the risks potential pitfalls and conserve our valuable organizational resources.Upgrading PostgreSQL database from version 10 to 12 for OpenProject can be challenging. Consider the following troubleshooting tips to ensure a smooth transition without losing any data:

Backup your Data

The first thing you need to do is back up your existing PostgreSQL databases. Backups are the key to resolve any issues related to data loss during the upgrade process. You can back up your data using the pg_dump or pg_dumpall commands:

pg_dump dbname > dbname.bak

Where “dbname” is the name of your database.

Install the new PostgreSQL 12 Version

Next, download and install the new PostgreSQL 12 version on the same server where the old version is running. Make sure that both versions are running side-by-side without any conflict. The official PostgreSQL website provides detailed installation guides.Official postgreSQL Website.

Use pg_upgrade Utility

PostgreSQL provides a utility called pg_upgrade that allows you to perform an in-place upgrade of your PostgreSQL installation. This means you don’t have to dump and reload your entire database, which can be a significant time-saver if you have large databases. Once both old (version 10) and new (version 12) servers are running, you can start the upgrade:

/usr/local/pgsql/bin/pg_upgrade \
-b /usr/local/pgsql.old/bin/ \
-B /usr/local/pgsql/bin/ \
-d /usr/local/pgsql.old/data/ \
-D /usr/local/pgsql/data/

Review Upgrade Results

After completing the pg_upgrade process, verify the output to ensure there were no errors during the upgrade. Also, check the new database with the application to make sure everything operates as expected within OpenProject. If there are problems, you can always revert to the backup taken at the start of the process.

Troubleshoot Issues Related to Extensions

If you’re making use of extensions in PostgreSQL, it’s worth noting that some might not work out-of-the-box with the newer version. To address this, review the error log generated by pg_upgrade for any signs of trouble, and adjust your code accordingly. For instance, you may need to update your extension to its latest version.

Here’s a simplified example of how extensions can be updated within your database:

psql -d dbname -c "ALTER EXTENSION hstore UPDATE;"

Where “hstore” is the extension name and “dbname” is your database name.

Note: Each of these steps assumes a good deal of familiarity with managing Postgres databases, so it would be wise for those less experienced to consult with a senior developer or DBA. Alternatively consider employing support from Postgres Professional team to undertake the upgrade.Postgres Professional Team.Sure thing! There’s potential to help boost productivity by streamlining the continuous functionality of an upgraded database, especially for PostgreSQL databases. Upgrading your PostgreSQL database from version 10 to 12 without losing data is a hot topic in the OpenProject community.

You may contemplate whether or not you should upgrade your database. The motivations behind this action can include improving performance, added functionalities, enhancing security, among other factors. Ensuring that your functionality remains constant throughout this process is crucial to maintain integrity and minimize operative interruptions.

Here are comprehensive steps to achieve a successful OpenProject database upgrade from PostgreSQL 10 to PostgreSQL 12:

STEP 1: Backup Your Current Database

First things first, never take the risk of upgrading your database without backup. As much as we trust the procedure, it’s always safe to have a plan B.

pg_dumpall > /temp/postgresql10.sql

This code exports all databases into a SQL script file PostgreSQL10.sql, which will serve as your insurance policy if anything goes south.

STEP 2: Installation of PostgreSQL 12

Before removing the older version, install PostgreSQL 12.

On Ubuntu, for example, you can use these commands:

wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo apt-key add -
echo "deb http://apt.postgresql.org/pub/repos/apt/ OSD-named-pgdg main" | sudo tee /etc/apt/sources.list.d/pgdg.list
sudo apt update
sudo apt install postgresql-12

STEP 3: Migration Of Database(s)

Migration involves dumping and reloading your database(s) with pg_upgrade or using a logical replication slot.

Use this command for a possible switchover:

sudo su - postgres
/usr/lib/postgresql/12/bin/pg_upgrade \
  --old-datadir /var/lib/postgresql/10/main    \ 
  --new-datadir /var/lib/postgresql/12/main    \
  --old-bindir /usr/lib/postgresql/10/bin      \
  --new-bindir /usr/lib/postgresql/12/bin

STEP 4: Revoke Extensions

Utilizing PostgreSQL extensions is a key strategy but can create some issues during upgrades. Make sure you revoke these before proceeding and reinstall them later on with their new versions;

sudo -u openproject psql -c "REVOKE CREATE ON SCHEMA public FROM PUBLIC;"
sudo -u openproject psql -c "REVOKE USAGE ON SCHEMA public FROM PUBLIC;"

STEP 5: Reconfigs

Best practice advises changing the default PostgreSQL port number (5432) to PostgreSQL 12 in OpenProject. Navigate to configuration.yaml, find

postgresql:

, and change ‘port’ to ‘5432’.

STEP 6: Restart Services

Finally, restart the services for your changes to take effect.

sudo service postgresql restart
openproject reconfigure

Remember to review any logs for error messages after the reconfiguration.

Maintaining the performance of a Postgres database requires that the DBA pays careful attention to how well the server is running (source: Aiven.io). This means looking at streaming data that provides hints about potential bottlenecks, whether they be IO, CPU, memory, or locking-related.

Upgrading can seem like an intimidating task, particularly when trying to safeguard your data. Armed with the right knowledge and resources (like pg_dumpall for backups), it becomes less daunting. In case of further queries, one can refer to the official PostgreSQL documentation (PostgreSQL 12 Documentation) which provides in-depth coverage of each upgrade step and potential challenges ahead.

By following the directions mentioned above, ensuring regular data backups, monitoring performance metrics, and auditing user activities, OpenProject database admins can streamline their continuous functionality during major database upgrades efficiently.
Before jumping straight into the process of updating your PostgreSQL database from version 10 to 12 for OpenProject, a crucial first step will be performing a test run. This is essential for identifying any potential issues that may arise and ensure that they won’t jeopardize your valuable data during the actual migration.

The test-run is essentially a simulation of the complete upgrade procedure without affecting your live database environment. The main steps include:

Creating a full backup of your existing PostgreSQL database:
Here we’re creating a clone of your existing database on which you can perform the test upgrade. This will not in any way affect your original database. Here is the PostgreSQL dump command that could be used for this purpose:

pg_dump -U postgres -W -F t openproject_backup.tar

Where:
– -U denotes the username with which to authenticate into the database.
– -W prompts the user to input their password.
– -F specifies the format of the output file. In our case ‘t’ means tar format.
– The final argument is the filename of the output file [1].

Create a new PostgreSQL 12 database server:
Since we want to test the migration process of upgrading Postgres from version 10 to 12, we need to set up an environment identical to what shall be there after the upgrade. That is, a PostgreSQL server running version 12.

Restore database dump to the new PostgreSQL server:
You have already created a copy of your existing database. Now, restore it to the new PostgreSQL 12 server using the pg_restore command:

pg_restore -U postgres -d openproject_test_database openproject_backup.tar

Here:
– -U denotes the username to validate against the new database.
– -d is the name of the database in the new Postgres server to which you want to restore your old database records.
– The last argument specifies the backup file [2].

Perform validations:
Your backed-up data is now restored to a PostgreSQL server version 12. It’s time to validate if everything looks good. Check the following few things:
– Does OpenProject work well with the updated configuration?
– Are there any missing entries or discrepancies in the records?
– Are the performance metrics such as latency, throughput, etc., within expected limits?

If all validations pass successfully, you’re good to conduct your actual migration with confidence. But remember, this result does not give absolute certainty about the success of the migration. Despite this fact, the test run significantly reduces the overall chances of data loss and helps to foresee and tackle any unfortunate occurrences beforehand.

Lastly, do a deep-dive into any errors or issues noticed during this test run, resolving them before the real upgrade and making sure to document the inputs thoroughly for future reference.

References:
1. [Official PostgreSQL Documentation](https://www.postgresql.org/docs/12/app-pgdump.html)
2. [PostgreSQL Backup and Restore Examples](https://www.thegeekstuff.com/2009/01/how-to-backup-and-restore-postgres-database-using-pg_dump-and-psql/).With all the aforementioned steps, one can successfully go about upgrading a PostgreSQL Database from version 10 to 12 for OpenProject, circumspectly avoiding any data loss. It’s advisable when dealing with your essential data, to follow these carefully thought out steps:

• First and foremost, ensure a comprehensive backup of your existing database, better still two backups wouldn’t hurt.

pg_dumpall > dbname.bak

• Secondly, stop its service before you start the upgrading process. You can use the following command:

systemctl stop postgresql

• Key is to install the new PostgreSQL version alongside the older one.

• Create a new PostgreSQL database cluster using the command

/usr/pgsql-12/bin/postgresql-12-setup initdb

• Customize the new postgresql.conf and pg_hba.conf files in the new data directory to resemble the old ones.

• Use the pg_upgrade command provided by PostgreSQL to upgrade. The pg_upgrade needs filesystem access to both the old and new data directories, so it runs as the OS user that owns the data.

su - postgres -c '/usr/pgsql-12/bin/pg_upgrade --old-bindir=/usr/bin --new-bindir=/usr/pgsql-12/bin --old-datadir=/var/lib/pgsql/data --new-datadir=/var/lib/pgsql/12/data --check'

After all stipulated steps, remember to restart the PostgreSQL 12 service and then initiate OpenProject Migration to test if everything works fine.

These steps go a long way ensuring an impeccable upgrade with utmost data security. Enhancing success story in seamless upgrade, the logical replication feature of PostgreSQL 10 version drastically reduces downtime during upgrades; and efficient partitioning features in PostgreSQL 12 as well as its improved query performance aids seamless transition even more profitable. Understandably, upgrading a database isn’t an everyday task; however, the nature of software innovation perpetuates need for occasional system upgrades. Testament to the overall applicability of this guide is its relevance not just for OpenProject users but for anyone wishing to upgrade their PostgreSQL database from version 10 to 12. This accounts for thier respective scale businesses too, from individual developers developing on local machines to large corporations handling enormous operational data. Source reference

To verify a successful migration, utilise the psql command line interface and check the returning value after running SELECT version();

For further information or troubleshooting steps, the official PostgreSQL documentation is an invaluable resource that offers extensive detailed guidelines on upgrading.