So you want to restart your passenger standalone app

```bash
cd path/to/app && ./bin/passenger-config restart-app .
```

This works until you have multiple passenger apps...

```bash
./bin/passenger-config restart-app .
It appears that multiple Phusion Passenger instances are running. Please select
a specific one by passing:

  --instance 

The following Phusion Passenger instances are running:

Name                       Description
------------------------------------------------------------------
oithHie6                   nginx/1.8.0 Phusion_Passenger/5.0.14
uftk5e6O                   nginx/1.8.0 Phusion_Passenger/5.0.18
```

So you have to update [Passengerfile.json](https://www.phusionpassenger.com/library/config/standalone/reference/#--instance-registry-dir-instance_registry_dir) 

```json
{
  "instance_reigstry_dir": "/path/to/instance"
}
```

**PROTIP**: long paths won't work - there're limits (sic!)

But you're not ready - it won't work either

```bash
./bin/passenger-config restart-app .
*** ERROR: Phusion Passenger doesn't seem to be running. If you are sure that it
is running, then the causes of this problem could be one of:

 1. You customized the instance registry directory using Apache's
    PassengerInstanceRegistryDir option, Nginx's
    passenger_instance_registry_dir option, or Phusion Passenger Standalone's
    --instance-registry-dir command line argument. If so, please set the
    environment variable PASSENGER_INSTANCE_REGISTRY_DIR to that directory
    and run this command again.
 2. The instance directory has been removed by an operating system background
    service. Please set a different instance registry directory using Apache's
    PassengerInstanceRegistryDir option, Nginx's passenger_instance_registry_dir
    option, or Phusion Passenger Standalone's --instance-registry-dir command
    line argument.
```

So you have to update bash variable...

```bash
export PASSENGER_INSTANCE_REGISTRY_DIR=/path/to/instance
```

    Q: But I'm running two apps under one user!
    A: Sorry, you're fucked

Or just run export in the deployment script, not in `bashrc`. And you guessed it - you cannot just pass `--instance-registry-dir` to the `passenger-config` command.