m-creations/docker-openwrt-elastic

Elasticsearch in a small OpenWrt container. For development use only.

Quickstart

Without arguments, the container starts the ElasticSearch server:

docker run -d --name elastic mcreations/openwrt-elastic

Configuration Details

The volume /data can be passed from outside of Docker container with -v switch. The ports can be opened with -p switch.

This is a sample command line with custom parameters:

docker run -d --name elastic1 \
       -e CLUSTER_NAME=my-cluster \
       -e NODE_NAME=my-first-node \
       -v /share/elastic:/data \
       -p 127.0.0.1:9200:9200 -p 127.0.0.1:9300:9300 \
       mcreations/elasticsearch

Additional Configuration Values

To add configuration values to the configuration file (config/elasticsearch.yml), you have to specify environment variables with specific names, which are automatically parsed during startup.

A variable specified as docker ... -e ESOPT_http__cors__allow___origin=\"*\" is translated to the following entry in elasticsearch.yml:

http.cors.allow-origin: "*"

which means that the prefix ESOPT_ is removed, __ is replaced by ., and ___ is replaced by -.

Templates Import Configuration

This image is capable of importing index templates which are applied to indices when they are created.

All templates should be in json format. Their name will be deduced from the template attribute in their json definition after eliminating * symbols.

All imported json files will be moved into the ./imported folder after importing.

There are two ways for importing templates into ES.

Internal templates

Internal templates are read from /etc/elastic/templates which is empty in this image, so you can safely extend this image and use ADD in your Dockerfile to add the templates.

External templates

External templates are read from the /data/templates directory which can be mounted from outside. All files with extension .json are explected to be ES template JSON files.

The external templates will be imported after importing the internal templates.

For the complete details of the configuration, please see

• start-elastic.sh

Errors

Building an image from this repository, and creating a container from that, returns a few errors:

... wait until http://localhost:9200 coming up to create templates and indices ...
shell-init: error retrieving current directory: getcwd: cannot access parent directories: Inappropriate ioctl for device
shell-init: error retrieving current directory: getcwd: cannot access parent directories: Inappropriate ioctl for device
chdir: error retrieving current directory: getcwd: cannot access parent directories: No child processes

but the containers from this image work despite these errors. Please open an issue if it doesn't work in your setting!

docker-openwrt-elastic's Issues

Environment vars CLUSTER_NAME and NODE_NAME are not used

When starting a container with

docker run -d --name elastic1 \
       -e CLUSTER_NAME=my-cluster \
       -e NODE_NAME=my-first-node \
       -v /share/elastic:/data \
       -p 9200:9200 -p 9300:9300 mcreations/openwrt-elastic

I can docker exec bash into the container and find

cat config/elasticsearch.yml

cluster.name: ${CLUSTER_NAME}
node.name: ${NODE_NAME}

(reported by @irmann)