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PostgreSQL Database Exporting

The information below is to help with current or future migration of the Postgres databases on your SCALE system running TrueCharts apps.

Prerequisites

The user running the scripts must have permissions to access the TrueNAS SCALE host shell and execute kubectl commands.

You can use these details to login to e.g. pgadmin, one of the TC apps that lets you manage databases.

#!/bin/bash

# get namespaces
namespaces=$(k3s kubectl get secrets -A | grep -E "dbcreds|cnpg-main-urls" | awk '{print $1, $2}')

# iterate over namespaces
( printf "Application | Username | Password | Address | Port\n"
echo "$namespaces" | while read ns secret; do
    # extract application name
    app_name=$(echo "$ns" | sed 's/^ix-//')
    if [ "$secret" = "dbcreds" ]; then
        creds=$(k3s kubectl get secret/$secret --namespace "$ns" -o jsonpath='{.data.url}' | base64 -d)
    else
        creds=$(k3s kubectl get secret/$secret --namespace "$ns" -o jsonpath='{.data.std}' | base64 -d)
    fi

    # get username, password, addresspart, and port
    username=$(echo "$creds" | awk -F '//' '{print $2}' | awk -F ':' '{print $1}')
    password=$(echo "$creds" | awk -F ':' '{print $3}' | awk -F '@' '{print $1}')
    addresspart=$(echo "$creds" | awk -F '@' '{print $2}' | awk -F ':' '{print $1}')
    port=$(echo "$creds" | awk -F ':' '{print $4}' | awk -F '/' '{print $1}')

    # construct full address
    full_address="${addresspart}.${ns}.svc.cluster.local"

    # print results with aligned columns
    printf "%s | %s | %s | %s | %s\n" "$app_name" "$username" "$password" "$full_address" "$port"
done ) | column -t -s "|"

Setting up the files

In TrueNAS SCALE, create a dataset that can house the script files. Put the .sh files in that dataset. Navigate to the dataset from the host shell. Make the files executable.

cd /mnt/tank/scripts/databases
chmod +x tcdbinfo.sh