Added TrueCharts db tools

Copied from here:
https://truecharts.org/manual/SCALE/guides/sql-export/

Link to source of page:
https://github.com/truecharts/website/blame/main/docs/manual/SCALE/guides/sql-export.md#L13

Permalink in space/time:
30484d04f7/docs/manual/SCALE/guides/sql-export.md (L13)

tcdbbackup.sh

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+#!/bin/bash
+# create backup folder
+folder="./dumps/"
+mkdir -p "$folder"
+
+# get namespaces with postgres database pod
+namespaces=$(k3s kubectl get pods -A | grep postgres | awk '{print $1}')
+
+for ns in $namespaces; do
+  # extract application name
+  app=$(echo "$ns" | sed 's/^ix-//')
+
+  echo "Creating database backup for $app."
+
+  file="$app.sql"
+  
+  # Scale down deployment to avoid inconsistencies in DB
+  k3s kubectl scale deploy "$app" -n "$ns" --replicas=0
+  while true; do k3s kubectl get pods -n "$ns" | grep -i -q terminating || break; done;
+
+  k3s kubectl exec -n "$ns" -c "$app"-postgresql "$app"-postgresql-0 -- bash -c 'PGPASSWORD=$POSTGRES_PASSWORD pg_dump -Fc -U $POSTGRES_USER -d $POSTGRES_DB -f /tmp/'$file
+  k3s kubectl cp -n "$ns" -c "$app"-postgresql "$app-postgresql-0:tmp/$file" $folder$file
+
+  # Scale deployment back up
+  k3s kubectl scale deploy "$app" -n "$ns" --replicas=1
+  
+  if [ ! -f "$folder$file" ]; then
+    >&2 echo "$folder$file does not exist."
+    exit 1
+  fi
+
+  echo "File $file created."
+
+done
+
+exit 0
+

tcdbinfo.sh

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+#!/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 "|"