Published on January 08, 2023
If you have installed PostgreSQL on your server, then you may need to migrate your existing PostgreSQL database to the new version. This happens with every major version increase, as PostgreSQL may decide to modify the database format. As such, we first export the contents of our PostgreSQL database to a series of SQL queries that we can then execute to import the data into the new database. Thus, we run the following commands to export the database:
FILENAME=dump_`date +%d-%m-%Y"_"%H_%M_%S`.sql pg_dumpall -c -U postgres > $FILENAME
The above command is also useful if you want to regularly make backups of your PostgreSQL database.
To upgrade Alpine we simply need to modify the versions in the
For instance, to upgrade from Alpine Linux 3.16 to 3.17, we would change
v3.17 in the following two lines in the
It's also possible to use the
sed tool to simply update the version numbers:
sed -i -e 's/v3\.16/v3.17/g' /etc/apk/repositories
After updating the repositories, we can simply update the package lists by running the following command:
While not always necessary, it is recommend to update Alpine's package manager first:
apk add --upgrade apk-tools
Then we can upgrade all installed packages, including packages that have the same version numbers using the
--available switch (in case uClibc requires this):
apk upgrade --available
If the Linux kernel has been updated, you may want to reboot the machine as follows:
Otherwise you can simply update any of the updated services.
After updating Alpine Linux, we can restart the PostgreSQL service:
If the major version increased in between updates, the above command will create a new database from scratch. Thus, we have to import the contents of our previous PostgreSQL database by running the following command:
cat $FILENAME | psql -U postgres -d postgres
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