edib

sudo apt-get install postgresql-9.6 postgresql-server-dev-9.6 postgresql-contrib-9.6 -y
 
sudo su - postgres -c "psql template1 -p 5433 -c 'CREATE EXTENSION IF NOT EXISTS hstore;'"
sudo su - postgres -c "psql template1 -p 5433 -c 'CREATE EXTENSION IF NOT EXISTS \"uuid-ossp\";'"
sudo systemctl stop postgresql
sudo su - postgres -c '/usr/lib/postgresql/9.6/bin/pg_upgrade -b /usr/lib/postgresql/9.3/bin -B /usr/lib/postgresql/9.6/bin \
-d /var/lib/postgresql/9.3/main/ -D /var/lib/postgresql/9.6/main/ \
-O "-c config_file=/etc/postgresql/9.6/main/postgresql.conf" -o "-c config_file=/etc/postgresql/9.3/main/postgresql.conf" --link'
 
sudo apt-get remove postgresql-9.3 -y

edib

server {
  listen 80;
  server_name example.com www.example.com;
  return 301 https://$host$request_uri;
}

server {
  listen 443 ssl;

  server_name example.com www.example.com;

edib

Edit /var/lib/postgres/data/postgresql.conf:

# change IP on subscriber
listen_addresses = '*'
wal_level = logical
shared_preload_libraries = 'pglogical'
max_worker_processes = 16
max_wal_senders = 16
max_replication_slots = 16
track_commit_timestamp = on