dokku elasticsearch

Official elasticsearch plugin for dokku. Currently defaults to installing elasticsearch 7.16.3.

Requirements

• dokku 0.19.x+
• docker 1.8.x

Installation

# on 0.19.x+
sudo dokku plugin:install https://github.com/dokku/dokku-elasticsearch.git elasticsearch

Commands

elasticsearch:app-links <app>                      # list all elasticsearch service links for a given app
elasticsearch:create <service> [--create-flags...] # create a elasticsearch service
elasticsearch:destroy <service> [-f|--force]       # delete the elasticsearch service/data/container if there are no links left
elasticsearch:enter <service>                      # enter or run a command in a running elasticsearch service container
elasticsearch:exists <service>                     # check if the elasticsearch service exists
elasticsearch:expose <service> <ports...>          # expose a elasticsearch service on custom host:port if provided (random port on the 0.0.0.0 interface if otherwise unspecified)
elasticsearch:info <service> [--single-info-flag]  # print the service information
elasticsearch:link <service> <app> [--link-flags...] # link the elasticsearch service to the app
elasticsearch:linked <service> <app>               # check if the elasticsearch service is linked to an app
elasticsearch:links <service>                      # list all apps linked to the elasticsearch service
elasticsearch:list                                 # list all elasticsearch services
elasticsearch:logs <service> [-t|--tail] <tail-num-optional> # print the most recent log(s) for this service
elasticsearch:promote <service> <app>              # promote service <service> as ELASTICSEARCH_URL in <app>
elasticsearch:restart <service>                    # graceful shutdown and restart of the elasticsearch service container
elasticsearch:start <service>                      # start a previously stopped elasticsearch service
elasticsearch:stop <service>                       # stop a running elasticsearch service
elasticsearch:unexpose <service>                   # unexpose a previously exposed elasticsearch service
elasticsearch:unlink <service> <app>               # unlink the elasticsearch service from the app
elasticsearch:upgrade <service> [--upgrade-flags...] # upgrade service <service> to the specified versions

Usage

Help for any commands can be displayed by specifying the command as an argument to elasticsearch:help. Plugin help output in conjunction with any files in the docs/ folder is used to generate the plugin documentation. Please consult the elasticsearch:help command for any undocumented commands.

Basic Usage

create a elasticsearch service

# usage
dokku elasticsearch:create <service> [--create-flags...]

flags:

• -c|--config-options "--args --go=here": extra arguments to pass to the container create command (default: None)
• -C|--custom-env "USER=alpha;HOST=beta": semi-colon delimited environment variables to start the service with
• -i|--image IMAGE: the image name to start the service with
• -I|--image-version IMAGE_VERSION: the image version to start the service with
• -m|--memory MEMORY: container memory limit in megabytes (default: unlimited)
• -p|--password PASSWORD: override the user-level service password
• -r|--root-password PASSWORD: override the root-level service password
• -s|--shm-size SHM_SIZE: override shared memory size for elasticsearch docker container

Create a elasticsearch service named lollipop:

dokku elasticsearch:create lollipop

You can also specify the image and image version to use for the service. It must be compatible with the elasticsearch image.

export ELASTICSEARCH_IMAGE="elasticsearch"
export ELASTICSEARCH_IMAGE_VERSION="${PLUGIN_IMAGE_VERSION}"
dokku elasticsearch:create lollipop

You can also specify custom environment variables to start the elasticsearch service in semi-colon separated form.

export ELASTICSEARCH_CUSTOM_ENV="USER=alpha;HOST=beta"
dokku elasticsearch:create lollipop

print the service information

# usage
dokku elasticsearch:info <service> [--single-info-flag]

flags:

• --config-dir: show the service configuration directory
• --data-dir: show the service data directory
• --dsn: show the service DSN
• --exposed-ports: show service exposed ports
• --id: show the service container id
• --internal-ip: show the service internal ip
• --links: show the service app links
• --service-root: show the service root directory
• --status: show the service running status
• --version: show the service image version

Get connection information as follows:

dokku elasticsearch:info lollipop

You can also retrieve a specific piece of service info via flags:

dokku elasticsearch:info lollipop --config-dir
dokku elasticsearch:info lollipop --data-dir
dokku elasticsearch:info lollipop --dsn
dokku elasticsearch:info lollipop --exposed-ports
dokku elasticsearch:info lollipop --id
dokku elasticsearch:info lollipop --internal-ip
dokku elasticsearch:info lollipop --links
dokku elasticsearch:info lollipop --service-root
dokku elasticsearch:info lollipop --status
dokku elasticsearch:info lollipop --version

list all elasticsearch services

# usage
dokku elasticsearch:list 

List all services:

dokku elasticsearch:list

print the most recent log(s) for this service

# usage
dokku elasticsearch:logs <service> [-t|--tail] <tail-num-optional>

flags:

• -t|--tail [<tail-num>]: do not stop when end of the logs are reached and wait for additional output

You can tail logs for a particular service:

dokku elasticsearch:logs lollipop

By default, logs will not be tailed, but you can do this with the --tail flag:

dokku elasticsearch:logs lollipop --tail

The default tail setting is to show all logs, but an initial count can also be specified:

dokku elasticsearch:logs lollipop --tail 5

link the elasticsearch service to the app

# usage
dokku elasticsearch:link <service> <app> [--link-flags...]

flags:

• -a|--alias "BLUE_DATABASE": an alternative alias to use for linking to an app via environment variable
• -q|--querystring "pool=5": ampersand delimited querystring arguments to append to the service link

A elasticsearch service can be linked to a container. This will use native docker links via the docker-options plugin. Here we link it to our playground app.

NOTE: this will restart your app

dokku elasticsearch:link lollipop playground

The following environment variables will be set automatically by docker (not on the app itself, so they won’t be listed when calling dokku config):

DOKKU_ELASTICSEARCH_LOLLIPOP_NAME=/lollipop/DATABASE
DOKKU_ELASTICSEARCH_LOLLIPOP_PORT=tcp://172.17.0.1:9200
DOKKU_ELASTICSEARCH_LOLLIPOP_PORT_9200_TCP=tcp://172.17.0.1:9200
DOKKU_ELASTICSEARCH_LOLLIPOP_PORT_9200_TCP_PROTO=tcp
DOKKU_ELASTICSEARCH_LOLLIPOP_PORT_9200_TCP_PORT=9200
DOKKU_ELASTICSEARCH_LOLLIPOP_PORT_9200_TCP_ADDR=172.17.0.1

The following will be set on the linked application by default:

ELASTICSEARCH_URL=http://dokku-elasticsearch-lollipop:9200

The host exposed here only works internally in docker containers. If you want your container to be reachable from outside, you should use the expose subcommand. Another service can be linked to your app:

dokku elasticsearch:link other_service playground

It is possible to change the protocol for ELASTICSEARCH_URL by setting the environment variable ELASTICSEARCH_DATABASE_SCHEME on the app. Doing so will after linking will cause the plugin to think the service is not linked, and we advise you to unlink before proceeding.

dokku config:set playground ELASTICSEARCH_DATABASE_SCHEME=http2
dokku elasticsearch:link lollipop playground

This will cause ELASTICSEARCH_URL to be set as:

http2://dokku-elasticsearch-lollipop:9200

unlink the elasticsearch service from the app

# usage
dokku elasticsearch:unlink <service> <app>

You can unlink a elasticsearch service:

NOTE: this will restart your app and unset related environment variables

dokku elasticsearch:unlink lollipop playground

Service Lifecycle

The lifecycle of each service can be managed through the following commands:

enter or run a command in a running elasticsearch service container

# usage
dokku elasticsearch:enter <service>

A bash prompt can be opened against a running service. Filesystem changes will not be saved to disk.

NOTE: disconnecting from ssh while running this command may leave zombie processes due to moby/moby#9098

dokku elasticsearch:enter lollipop

You may also run a command directly against the service. Filesystem changes will not be saved to disk.

dokku elasticsearch:enter lollipop touch /tmp/test

expose a elasticsearch service on custom host:port if provided (random port on the 0.0.0.0 interface if otherwise unspecified)

# usage
dokku elasticsearch:expose <service> <ports...>

Expose the service on the service's normal ports, allowing access to it from the public interface (0.0.0.0):

dokku elasticsearch:expose lollipop 9200 9300

Expose the service on the service's normal ports, with the first on a specified ip adddress (127.0.0.1):

dokku elasticsearch:expose lollipop 127.0.0.1:9200 9300

unexpose a previously exposed elasticsearch service

# usage
dokku elasticsearch:unexpose <service>

Unexpose the service, removing access to it from the public interface (0.0.0.0):

dokku elasticsearch:unexpose lollipop

promote service as ELASTICSEARCH_URL in

# usage
dokku elasticsearch:promote <service> <app>

If you have a elasticsearch service linked to an app and try to link another elasticsearch service another link environment variable will be generated automatically:

DOKKU_ELASTICSEARCH_BLUE_URL=http://other_service:ANOTHER_PASSWORD@dokku-elasticsearch-other-service:9200/other_service

You can promote the new service to be the primary one:

NOTE: this will restart your app

dokku elasticsearch:promote other_service playground

This will replace ELASTICSEARCH_URL with the url from other_service and generate another environment variable to hold the previous value if necessary. You could end up with the following for example:

ELASTICSEARCH_URL=http://other_service:ANOTHER_PASSWORD@dokku-elasticsearch-other-service:9200/other_service
DOKKU_ELASTICSEARCH_BLUE_URL=http://other_service:ANOTHER_PASSWORD@dokku-elasticsearch-other-service:9200/other_service
DOKKU_ELASTICSEARCH_SILVER_URL=http://lollipop:SOME_PASSWORD@dokku-elasticsearch-lollipop:9200/lollipop

start a previously stopped elasticsearch service

# usage
dokku elasticsearch:start <service>

Start the service:

dokku elasticsearch:start lollipop

stop a running elasticsearch service

# usage
dokku elasticsearch:stop <service>

Stop the service and the running container:

dokku elasticsearch:stop lollipop

graceful shutdown and restart of the elasticsearch service container

# usage
dokku elasticsearch:restart <service>

Restart the service:

dokku elasticsearch:restart lollipop

upgrade service to the specified versions

# usage
dokku elasticsearch:upgrade <service> [--upgrade-flags...]

flags:

• -c|--config-options "--args --go=here": extra arguments to pass to the container create command (default: None)
• -C|--custom-env "USER=alpha;HOST=beta": semi-colon delimited environment variables to start the service with
• -i|--image IMAGE: the image name to start the service with
• -I|--image-version IMAGE_VERSION: the image version to start the service with
• -R|--restart-apps "true": whether to force an app restart
• -s|--shm-size SHM_SIZE: override shared memory size for elasticsearch docker container

You can upgrade an existing service to a new image or image-version:

dokku elasticsearch:upgrade lollipop

Service Automation

Service scripting can be executed using the following commands:

list all elasticsearch service links for a given app

# usage
dokku elasticsearch:app-links <app>

List all elasticsearch services that are linked to the playground app.

dokku elasticsearch:app-links playground

check if the elasticsearch service exists

# usage
dokku elasticsearch:exists <service>

Here we check if the lollipop elasticsearch service exists.

dokku elasticsearch:exists lollipop

check if the elasticsearch service is linked to an app

# usage
dokku elasticsearch:linked <service> <app>

Here we check if the lollipop elasticsearch service is linked to the playground app.

dokku elasticsearch:linked lollipop playground

list all apps linked to the elasticsearch service

# usage
dokku elasticsearch:links <service>

List all apps linked to the lollipop elasticsearch service.

dokku elasticsearch:links lollipop

Disabling docker pull calls

If you wish to disable the docker pull calls that the plugin triggers, you may set the ELASTICSEARCH_DISABLE_PULL environment variable to true. Once disabled, you will need to pull the service image you wish to deploy as shown in the stderr output.

Please ensure the proper images are in place when docker pull is disabled.