NG-Relay Docker Compose

This repository contains an example of how to run the Devo NG-Relay and Devo NG-Relay CLI together with docker compose. It is not mandatory, but recommended, to run both applications.

• Requirements
• Preparation
• Start the relay
• Stop the relay
• Check the relay logs
• Troubleshooting
• Useful commands

Requirements

Make sure you can provide a host machine with the requirements specified in this article.

As we will use docker to run the relay, the following additional requirements have to be met:

• docker-compose version: v1.27+

Preparation

• Clone this repo in the machine where you want to install the relay

• Create new folders for config, local logs, and disk buffer in the same folder where the docker-compose.yml file is located.

mkdir conf buffer logs

• All the above folders must have write and execute permissions for others.

sudo chmod 777 conf/ buffer/ logs/

• Edit the environment file

To work with this docker-compose file, some environment variables need to be set. For this purpose, there is an environment file .env in which you can set them. There is a short description of each of them below:

Name	Mandatory	Default Value	Description
LOG_LEVEL	No	info	Sets the log level for the Devo NG-Relay.
JAVA_OPTS	No	-Xmx1G -Xms1G	Space-separated quoted list in which you can activate/deactivate any of the JVM flags.
TCP_PORT_RANGE	No	13003-13020	Used to open the TCP ports specified in all the user-defined rules.
UDP_PORT_RANGE	No	13003-13020	Used to open the UDP ports specified in all the user-defined rules.

Start the relay

The recommended way to launch this docker-compose is executing the following command:

docker-compose run --rm devo-ng-relay-cli

The command above will run the Devo NG-Relay and the Devo NG-Relay CLI and will present the prompt of the Devo NG-Relay CLI waiting for commands to run. You can type exit when you are done with the CLI. The relay container will continue up and running.

The first time a relay is started, you will have to perform the setup process using the CLI. To do it, follow the steps indicated in Set up your relay.

If you encounter any problem, refer to the Troubleshooting section.

Stop the relay

To stop and destroy all the containers and networks created before, run the following command:

docker-compose down

Note that the relay configuration will remain available as it is stored outside the containers. Using the start command above will start the relay again using the existing configuration.

Check the relay logs

To check the relay container logs, use this command:

docker-compose logs -f devo-ng-relay

Troubleshooting

Devo NG-Relay CLI cannot connect to Devo NG-Relay

Often, the first time this docker-compose is launched we might see the following message:

***************************
APPLICATION FAILED TO START
***************************

Description:

Error connecting to devo-ng-relay:12998

Action:

Consider launching the application with the following arguments:
        --host=<HOST>
        --port=<PORT>

ERROR: 1

This occurs because the Devo NG-Relay is not fully started when the Devo NG-Relay CLI started. To solve this, simply re-run the command below:

docker-compose run --rm devo-ng-relay-cli

When I modify an environment variable the changes are not reflected to the container

After an environment variable is changed the Devo NG-Relay container needs to be re-created. To do so, just execute:

docker-compose up [-d] devo-ng-relay

Error creating volume

You might see an error similar to the following if the folders for the volumes are not created:

Creating network "xxxx_default" with the default driver
Creating devo-ng-relay ... error
Creating volume "xxxx_conf" with local driver
ERROR: for devo-ng-relay  Cannot create container for service devo-ng-relay: failed to mount local volume: mount /<your_conf_path>:/var/lib/docker/volumes/xxxx_conf/_data, flags: 0x1000: no such file or directory

If this happens to you, please refer to the Requirements section and ensure that the folders have been created correctly.

Failed to mount local volume error

A very similar issue to the one before is this error:

Error response from daemon: failed to mount local volume: 
mount ./conf:/var/lib/docker/volumes/xxxx_conf/_data, flags: 0x1000: no such file or directory

This may happen to you if this docker-compose file is run by using the new Compose V2. If that is the case, please update this project to 1.2.1+, at least, and re-run the docker compose file.

There is several bugs related to this issue on Github for docker compose V2 (link).

NOTE: Depending on the shell you are running this compose file, it may or may not be necessary to export a variable called PWD pointing to the path where the volumes are located prior to run the docker compose. For example:

export PWD=$(pwd)                           # PWD points to the current dir
docker compose run --rm devo-ng-relay-cli   # Start the docker compose

After configuring a new relay I see exceptions thrown in the logs

An example of this kind of errors is the following:

devo-ng-relay        | Aug  5 09:51:22 57b09a9df2e3 syslog.scoja.configuration: While (re)loading "/opt/devo/ng-relay/conf/relay/run/me.conf": org.scoja.common.ConfigurationException: Error while interpreting configuration file "/opt/devo/ng-relay/conf/relay/run/me.conf": Traceback (most recent call last):
devo-ng-relay        |   File "/opt/devo/ng-relay/conf/relay/run/me.conf", line 10, in <module>
devo-ng-relay        |     trans = outTransports(
devo-ng-relay        |   File "/opt/devo/ng-relay/conf/relay/run/defs.py", line 113, in outTransports
devo-ng-relay        |     buf = diskfall(
devo-ng-relay        |   File "<scoja language definition>", line 550, in diskfall
devo-ng-relay        | 	at sun.nio.fs.UnixException.translateToIOException(UnixException.java:84)
devo-ng-relay        | 	at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
devo-ng-relay        | 	at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
devo-ng-relay        | 	at sun.nio.fs.UnixFileSystemProvider.createDirectory(UnixFileSystemProvider.java:384)
devo-ng-relay        | 	at java.nio.file.Files.createDirectory(Files.java:674)
devo-ng-relay        | 	at java.nio.file.Files.createAndCheckIsDirectory(Files.java:781)
devo-ng-relay        | 	at java.nio.file.Files.createDirectories(Files.java:767)
devo-ng-relay        | 	at org.scoja.util.diskqueue.FilePairQueue.open(FilePairQueue.java:111)
devo-ng-relay        | 	at org.scoja.util.diskqueue.FilePairFall.<init>(FilePairFall.java:22)
devo-ng-relay        | 	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
devo-ng-relay        | 	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
devo-ng-relay        | 	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
devo-ng-relay        | 	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
devo-ng-relay        | 	at org.python.core.PyReflectedConstructor.constructProxy(PyReflectedConstructor.java:213)
devo-ng-relay        | java.nio.file.AccessDeniedException: java.nio.file.AccessDeniedException: /var/logt/buffer/me

To solve this, ensure the volume folders have the right permissions. Please refer to the Requirements section for this matter.

Ask for help

For an extra guidance or to further support, contact to support@devo.com.

Useful commands

Below there are some useful commands to work with this docker-compose file.

Start the Devo NG-Relay and Devo NG-Relay CLI

docker-compose run --rm devo-ng-relay-cli

Start the Devo NG-Relay only

If you only want to launch the Devo NG-Relay, you can try one of the following commands:

• Attached mode:

  docker-compose up devo-ng-relay

• Detached mode:

  docker-compose up -d devo-ng-relay

View the Devo NG-Relay logs

docker-compose logs -f devo-ng-relay

Display information about the status and ports of containers started with this file

docker-compose ps -a

Stop and destroy all the containers

docker-compose down

Enter into the Devo NG-Relay container

docker exec -it devo-ng-relay bash

Links

Devo

Devo NG-Relay documentation

Devo in DockerHub

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