truestuff/tcdbbackup.sh

#! /usr/bin/env bash
SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
USER_HOME=$HOME
[[ -n "${SUDO_USER}" ]] && USER_HOME="$(eval "echo ~${SUDO_USER}")"
. ${SHRC_D:-$SCRIPT_DIR}/01_util.functions 

set -e

# create backup folder
folder="./dumps/"
mkdir -p "$folder"

# get namespaces with postgres database pod
json_results=$(
    # While tcdbinfo lists all SQL databases, we want only postgresql
    # in this script.
    "${SCRIPT_DIR}/tcdbinfo.sh" --json "${@}" \
    | jq -s '.[] | select( .protocol = "postgresql" )'
)

namespaces=$(<<<"$json_results" jq -sr '.[] | .name')

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 $( # Does not affect the output
    ) pg_dump -Fc -U \$POSTGRES_USER -d \$POSTGRES_DB -f /tmp/$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