Deployment configurations — Nextcloud latest Administration Manual latest documentation

# Deployment configurations

Currently, only one kind of application deployment is supported:

  - Docker Deploy Daemon

## Docker Deploy Daemon

Orchestrates the deployment of applications as Docker containers.

Warning

The administrator is responsible for the security actions taken to configure the Docker daemon connected to the Nextcloud instance.

These schemes are only examples of possible configurations.

We recommend that you use the AppAPI Docker Socket Proxy or AIO Docker Socket Proxy container.

There are several Docker Daemon Deploy configurations (example schemes):

> - Nextcloud and Docker on the same host (via socket or DockerSocketProxy)

> - Nextcloud on the host and Docker on a remote host (via DockerSocketProxy with HTTPS)

> - Nextcloud and ExApps in the same Docker (via DockerSocketProxy)

> - Nextcloud in AIO Docker and ExApps in the same Docker (via AIO DockerSocketProxy)

### NC & Docker on the Same-Host

The simplest configuration is when Nextcloud is installed on the host and Docker is on the same host and applications are deployed to it.

stateDiagram-v2 classDef docker fill: #1f97ee, color: transparent, font-size: 34px, stroke: #364c53, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/docker.png) no-repeat center center / contain classDef nextcloud fill: #006aa3, color: transparent, font-size: 34px, stroke: #045987, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/nextcloud.svg) no-repeat center center / contain classDef python fill: #1e415f, color: white, stroke: #364c53, stroke-width: 1px Host state Host { Nextcloud --> Daemon : /var/run/docker.sock Daemon --> Containers state Containers { ExApp1 -- ExApp2 -- ExApp3 } } class Nextcloud nextcloud class Daemon docker class ExApp1 python class ExApp2 python class ExApp3 python

Suggested config values(template Custom default):

  1. Daemon host: `/var/run/docker.sock`

  2. HTTPS checkbox: not supported using docker socket

  3. Network: `host`

  4. HaProxy password: not supported using raw docker socket, should be empty

—

Suggested way to communicate with Docker via Docker Socket Proxy container.

stateDiagram-v2 classDef docker fill: #1f97ee, color: transparent, font-size: 34px, stroke: #364c53, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/docker.png) no-repeat center center / contain classDef nextcloud fill: #006aa3, color: transparent, font-size: 34px, stroke: #045987, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/nextcloud.svg) no-repeat center center / contain classDef python fill: #1e415f, color: white, stroke: #364c53, stroke-width: 1px Host state Host { Nextcloud --> DockerSocketProxy: by port Docker --> Containers Docker --> DockerSocketProxy : /var/run/docker.sock state Containers { DockerSocketProxy --> ExApp1 DockerSocketProxy --> ExApp2 DockerSocketProxy --> ExApp3 } } class Nextcloud nextcloud class Docker docker class ExApp1 python class ExApp2 python class ExApp3 python

Suggested config values(template Docker Socket Proxy):
  1. Daemon host: `localhost:2375`
       Choose A or B option:

         1. Docker Socket Proxy should be deployed with `network=host` and `BIND_ADDRESS=127.0.0.1`

         2. Docker Socket Proxy should be deployed with `network=bridge` and it’s port should be published to host’s 127.0.0.1(e.g. -p 127.0.0.1:2375:2375)

  2. HTTPS checkbox: disabled

  3. Network: `host`

  4. HaProxy password: should not be empty

Warning

Be careful with option `A`, by default Docker Socket Proxy binds to `*` if `BIND_ADDRESS` is not specified during container creation. Check opened ports after finishing configuration.

### Docker on a remote host

Distributed configuration occurs when Nextcloud is installed on one host and Docker is located on a remote host, resulting in the deployment of applications on the remote host.

Benefit: no performance impact on Nextcloud host.

In this case, the AppAPI uses a Docker Socket Proxy deployed on remote host to access docker socket and ExApps.

stateDiagram-v2 classDef docker fill: #1f97ee, color: transparent, font-size: 34px, stroke: #364c53, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/docker.png) no-repeat center center / contain classDef nextcloud fill: #006aa3, color: transparent, font-size: 34px, stroke: #045987, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/nextcloud.svg) no-repeat center center / contain classDef python fill: #1e415f, color: white, stroke: #364c53, stroke-width: 1px Direction LR Host1 --> Host2 : by port state Host1 { Nextcloud } state Host2 { [*] --> DockerSocketProxy : by port Daemon --> Containers state Containers { [*] --> DockerSocketProxy : /var/run/docker.sock DockerSocketProxy --> ExApp1 DockerSocketProxy --> ExApp2 DockerSocketProxy --> ExApp3 } } class Nextcloud nextcloud class Daemon docker class ExApp1 python class ExApp2 python class ExApp3 python

Suggested config values(template Docker Socket Proxy):

  1. Daemon host: ADDRESS_OF_REMOTE_MACHINE (e.g. server_name.com:2375)

  2. HTTPS checkbox: `enabled`

  3. Network: `host`

  4. HaProxy password: should not be empty

### NC & ExApps in the same Docker

Applications are deployed in the same Docker where Nextcloud resides.

Suggested way to communicate with Docker: via `docker-socket-proxy`.

stateDiagram-v2 classDef docker fill: #1f97ee, color: transparent, font-size: 34px, stroke: #364c53, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/docker.png) no-repeat center center / contain classDef nextcloud fill: #006aa3, color: transparent, font-size: 34px, stroke: #045987, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/nextcloud.svg) no-repeat center center / contain classDef python fill: #1e415f, color: white, stroke: #364c53, stroke-width: 1px Host state Host { Daemon --> Containers state Containers { [*] --> DockerSocketProxy : /var/run/docker.sock Nextcloud --> DockerSocketProxy: by port -- DockerSocketProxy --> ExApp1 DockerSocketProxy --> ExApp2 } } class Nextcloud nextcloud class Daemon docker class ExApp1 python class ExApp2 python class ExApp3 python

Suggested config values(template Docker Socket Proxy):

  1. Daemon host: nextcloud-appapi-dsp:2375

  2. HTTPS checkbox: `disabled`

  3. Network: user defined network

  4. HaProxy password: should not be empty

Note

Network should not be the default docker’s bridge as it does not support DNS resolving by container names.

This means that Docker Socket Proxy, Nextcloud and ExApps containers should all be in the same docker network, different from the default bridge.

### Nextcloud in Docker AIO (all-in-one)

In the case of AppAPI in Docker AIO setup (installed in Nextcloud container).

Note

AIO Docker Socket Proxy container must be enabled.

stateDiagram-v2 classDef docker fill: #1f97ee, color: transparent, font-size: 34px, stroke: #364c53, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/docker.png) no-repeat center center / contain classDef docker2 fill: #1f97ee, color: transparent, font-size: 20px, stroke: #364c53, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/docker.png) no-repeat center center / contain classDef nextcloud fill: #006aa3, color: transparent, font-size: 34px, stroke: #045987, stroke-width: 1px, background: url(https://raw.githubusercontent.com/nextcloud/documentation/master/admin_manual/exapps_management/img/nextcloud.svg) no-repeat center center / contain classDef python fill: #1e415f, color: white, stroke: #364c53, stroke-width: 1px Host state Host { Daemon --> Containers state Containers { [*] --> NextcloudAIOMasterContainer : /var/run/docker.sock [*] --> DockerSocketProxy : /var/run/docker.sock NextcloudAIOMasterContainer --> Nextcloud AppAPI --> Nextcloud : installed in Nextcloud --> DockerSocketProxy DockerSocketProxy --> ExApp1 DockerSocketProxy --> ExApp2 DockerSocketProxy --> ExApp3 } } class Nextcloud nextcloud class Daemon docker class Daemon2 docker2 class ExApp1 python class ExApp2 python class ExApp3 python

AppAPI will automatically create the default DaemonConfig for AIO Docker Socket Proxy in order to use it as an orchestrator to create ExApp containers.

Note

Default DaemonConfig will be created only if the default DaemonConfig is not already registered.

#### Default AIO Deploy Daemon

Nextcloud AIO has a specifically created Docker Socket Proxy container to be used as the Deploy Daemon in AppAPI. It has fixed parameters:

- Name: `docker_aio`

- Display name: `AIO Docker Socket Proxy`

- Accepts Deploy ID: `docker-install`

- Protocol: `http`

- Host: `nextcloud-aio-docker-socket-proxy:2375`

- Compute device: `CPU`

- Network: `nextcloud-aio`

- Nextcloud URL (passed to ExApps): `https://$NC_DOMAIN`

#### Docker Socket Proxy security

AIO Docker Socket Proxy has strictly limited access to the Docker APIs described in HAProxy configuration.

## NC to ExApp Communication

Each type of DeployDaemon necessarily implements the `resolveExAppUrl` function.

It has the prototype:

    public function resolveExAppUrl(
            string $appId, string $protocol, string $host, array $deployConfig, int $port, array &$auth
    ) {}

where:

- protocol is daemon protocol value

- host is daemon host value, can be DNS:port or IP:PORT or even path to docker socket.

- port is an integer with ExApp port

- deployConfig can be custom for each Daemon type

- auth is an optional array, with Basic Authentication data if needed to access ExApp

Note

The optional additional parameter OVERRIDE_APP_HOST can be used to override the host that will be used for ExApp binding.

It can be `0.0.0.0` in some specific configurations, when VPN is used or both Nextcloud instance and ExApps are one the same physical machine but different virtual environments.

Also you can specify something like `10.10.2.5` and in this case `ExApp` will try to bind to that address and AppAPI will try to send request s directly to this address assuming that ExApp itself bound on it.

The simplest implementation is in the Manual-Install deploy type:

    public function resolveExAppUrl(
            string $appId, string $protocol, string $host, array $deployConfig, int $port, array &$auth
    ): string {
            $auth = [];
            if (isset($deployConfig['additional_options']['OVERRIDE_APP_HOST']) &&
                    $deployConfig['additional_options']['OVERRIDE_APP_HOST'] !== ''
            ) {
                    $wideNetworkAddresses = ['0.0.0.0', '127.0.0.1', '::', '::1'];
                    if (!in_array($deployConfig['additional_options']['OVERRIDE_APP_HOST'], $wideNetworkAddresses)) {
                            $host = $deployConfig['additional_options']['OVERRIDE_APP_HOST'];
                    }
            }
            return sprintf('%s://%s:%s', $protocol, $host, $port);
    }

Here we see that AppAPI sends requests to the host:port specified during daemon creation.

Now, let’s take a look at the Docker Daemon implementation of `resolveExAppUrl`:

    public function resolveExAppUrl(
            string $appId, string $protocol, string $host, array $deployConfig, int $port, array &$auth
    ): string {
            $auth = [];
            if (isset($deployConfig['additional_options']['OVERRIDE_APP_HOST']) &&
                    $deployConfig['additional_options']['OVERRIDE_APP_HOST'] !== ''
            ) {
                    $wideNetworkAddresses = ['0.0.0.0', '127.0.0.1', '::', '::1'];
                    if (!in_array($deployConfig['additional_options']['OVERRIDE_APP_HOST'], $wideNetworkAddresses)) {
                            return sprintf(
                                    '%s://%s:%s', $protocol, $deployConfig['additional_options']['OVERRIDE_APP_HOST'], $port
                            );
                    }
            }
            $host = explode(':', $host)[0];
            if ($protocol == 'https') {
                    $exAppHost = $host;
            } elseif (isset($deployConfig['net']) && $deployConfig['net'] === 'host') {
                    $exAppHost = 'localhost';
            } else {
                    $exAppHost = $appId;
            }
            if (isset($deployConfig['haproxy_password']) && $deployConfig['haproxy_password'] !== '') {
                    $auth = [self::APP_API_HAPROXY_USER, $deployConfig['haproxy_password']];
            }
            return sprintf('%s://%s:%s', $protocol, $exAppHost, $port);
    }

Here we have much more complex algorithm of detecting to where requests should be send.

First of all, if the protocol is set to `https`, AppAPI always sends requests to the daemon host, and in this case, it is a HaProxy that will forward requests to ExApps that will be listening on `localhost`.

Briefly, it will look like this (haproxy_host==daemon host value):

NC –> https –> `haproxy_host:ex_app_port` –> http –> `localhost:ex_app_port`

When the protocol is not `https` but `http`, then what will be the endpoint where to send requests is determined by `$deployConfig['net']` value.

If `net` is defined and equal to `host`, then AppAPI assumes that ExApp is installed somewhere in the current host network and will be available on `localhost` loop-back adapter.

NC –> http –> `localhost:ex_app_port`

In all other cases, the ExApp should be available by it’s name: e.g. when using docker custom bridge network all containers available by DNS.

NC –> http –> `app_container_name:ex_app_port`

These three different types of communication cover most popular configurations.

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