WIP Prepare postgres for migration by replication

site-cookbooks/kosmos_postgresql/templates/create_subscriptions.sh.erb

@@ -0,0 +1,33 @@
+set -e
+
+echo "== Creating subscriptions for all databases =="
+
+for db in $(psql -Atqc "SELECT datname FROM pg_database WHERE datallowconn AND datname NOT IN ('template0','template1')"); do
+  echo "Processing DB: $db"
+
+  SLOT="migrate_slot_${db}"
+  SUB="migrate_sub_${db}"
+
+  psql -d "$db" -v ON_ERROR_STOP=1 <<SQL
+DO \$\$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM pg_subscription WHERE subname = '$SUB'
+  ) THEN
+    CREATE SUBSCRIPTION $SUB
+    CONNECTION 'host=<%= @pg_host %> port=<%= @pg_port %> dbname=$db user=<%= @pg_user %> password=<%= @pg_pass %>'
+    PUBLICATION migrate_pub
+    WITH (
+      slot_name = '$SLOT',
+      create_slot = false,
+      copy_data = false,
+      enabled = true
+    );
+  END IF;
+END
+\$\$;
+SQL
+
+done
+
+echo "== Done =="