问题

My OpenProject management software is installed with default postgresql 10. Currently the postgresql DB is 12, It is having lot of new features.

I want to upgrade my Postgres DB without losing the data in the DB. My system is ubuntu 18.04 and hosted openproject.

I searched the internet and could not find a step by step to upgrade postgresql.

Can you please guide me to install new DB and all data should be in the new DB. thanks for your help.

回答1:

A) First create a backup of all the databases for that (You can continue from B if you dont need a backup)

    sudo su postgres

Create a backup .sql file for all the data you have in all the databases

    pg_dumpall > backup.sql

B) Upgrade to PostgreSQL12

update packages and install postgres 12

     sudo apt-get update
     sudo apt-get install postgresql-12 postgresql-server-dev-12

Stop the postgresql service

     sudo systemctl stop postgresql.service

migrate the data

     /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 \
     --old-options '-c config_file=/etc/postgresql/10/main/postgresql.conf' \
     --new-options '-c config_file=/etc/postgresql/12/main/postgresql.conf'

Switch to regular user

     exit

Swap the ports the old and new postgres versions.

     sudo vim /etc/postgresql/12/main/postgresql.conf
     #change port to 5432
     sudo vim /etc/postgresql/10/main/postgresql.conf
     #change port to 5433

Start the postgresql service

     sudo systemctl start postgresql.service

     sudo su postgres

Check your new postgres version

     psql -c "SELECT version();"

Run the generated new cluster script

     ./analyze_new_cluster.sh

Return as a normal(default user) user and cleanup up the old version's mess

     sudo apt-get remove postgresql-10 postgresql-server-dev-10
     #uninstalls postgres packages
     sudo rm -rf /etc/postgresql/10/
     #removes the old postgresql directory
     sudo su postgres
     #login as postgres user
     ./delete_old_cluster.sh
     #delete the old cluster data

Congrads! Your postgresql version is now upgraded, If everything works well in B, we dont have to apply the backup as we have already migrated the data from the older version to the newer version, the backup is just in case if anything goes wrong.

NOTE: Change the postgresql.conf and pg_hba.conf as per your requirement

PS: Feel free to comment your issues, suggestions or anyother modifications you would like to suggest

回答2:

Backup the database
```
psql --version sudo -u postgres psql pg_dumpall > alldbs.sql
```
(this command will backup all databases from the postgresql db)

Then exit from postgres user, and:

Inside a terminal run these commands:

sudo systemctl stop postgres
sudo apt-get install -y postgresql-12 postgresql-server-dev-12 postgresql-contrib-12 libpq-dev postgresql-12-hypopg
sudo pg_dropcluster 12 main --stop
sudo pg_upgradecluster 10 main
sudo pg_dropcluster 10 main --stop

restart the postgresql service:
```
sudo systemctl restart postgresql
```
login to the postgres:
```
su - postgres
```
to check the version:
```
psql --version
```

I have done using the above steps and I could update the DBand restore all data.

回答3:

Postgresql Upgrade using pg_upgrade

Step - 1 (Find the locale language and encoding of source Postgresql server)

Log in to Postgresql database as postgres user
Execute the query SHOW LC_COLLATE;

Step - 2 ( Stop the existing/source Postgresql server)

Find the running Postgresql service using $ sudo systemctl list-units | grep postgres
Stop the service $ sudo service postgresql-<source-version>.service stop

Step - 3 (Install target Postgresql server)

Configure repos and install (lot of tutorials available in google)

Step - 4 (Update the locale language and encoding)

$ /usr/pgsql-<target-version>/bin/initdb -D /var/lib/pgsql/<target-version>/data --locale=<add-your-encoding>

Step - 5 (Check the source to target upgrade has any potential issues)

Run the command as postgres user, $sudo su postgres

  $  /usr/pgsql-<target-version>/bin/pg_upgrade --old-bindir /usr/pgsql-<source-version>/bin --new-bindir /usr/pgsql-<target-version>/bin --old-datadir /var/lib/pgsql/<source-version>/data --new-datadir /var/lib/pgsql/12/data --link --jobs=2 --check

If it's ok we can move to the next step, If not fix the issues before proceeding to the next step Expected output: Clusters are compatible

Step - 6 (Upgrade the source to target Postgresql version using the link option)

link option is pretty faster than the migration
Run the command as postgres user, $sudo su postgres

    $ /usr/pgsql-<target-version>/bin/pg_upgrade --old-bindir /usr/pgsql-<source-version>/bin --new-bindir /usr/pgsql-<target-version>/bin --old-datadir /var/lib/pgsql/<source-version>/data --new-datadir /var/lib/pgsql/<target-version>/data --link

Expected output: Upgrade Complete

Thanks. ENJOY !!!

来源：https://stackoverflow.com/questions/60409585/how-to-upgrade-postgresql-database-from-10-to-12-without-losing-data-for-openpro

标签

postgresql

ubuntu-18.04

openproject

How to upgrade postgresql database from 10 to 12 without losing data for openproject

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