This is a small example of how to use Elastic, the Elasticsearch client for Go, with Docker and Docker Compose.
Docker Compose orchestrates two containers. It requires Docker/Compose 1.12+
as the docker-compose.yml configuration uses version 2.1
(see here for Docker Compile file versioning matrix).
First, there is the
Elasticsearch container. We use
the default configuration, but we mount the data directory on /tmp/esdata.
See here
why we do this.
Second, we host a simple app in a container that will connect to the Elasticsearch container and will periodically call the Nodes Info API.
To start everything up, run docker-compose up, then watch docker-compose logs
in another shell.
The application might restart several times until the Elasticsearch container is up and running. It might print something like this eventually:
app_1 | 2017/03/01 08:21:39 main.go:38: Lookup for elasticsearch returns the following IPs:
app_1 | 2017/03/01 08:21:39 main.go:40: 172.19.0.2
app_1 | 2017/03/01 08:21:39 main.go:43: Retrieving http://elasticsearch:9200:
app_1 | 2017/03/01 08:21:39 main.go:53: {
app_1 | "name" : "YyRepA3",
app_1 | "cluster_name" : "elasticsearch",
app_1 | "cluster_uuid" : "V46AhaVLSJm4ERTgMEz_KA",
app_1 | "version" : {
app_1 | "number" : "5.0.0",
app_1 | "build_hash" : "253032b",
app_1 | "build_date" : "2016-10-26T05:11:34.737Z",
app_1 | "build_snapshot" : false,
app_1 | "lucene_version" : "6.2.0"
app_1 | },
app_1 | "tagline" : "You Know, for Search"
app_1 | }
app_1 | 2017/03/01 08:21:39 main.go:56: connecting to http://elasticsearch:9200
app_1 | 2017/03/01 08:21:39 main.go:61: connected to http://elasticsearch:9200
app_1 | 2017/03/01 08:21:39 main.go:101: Cluster "elasticsearch" with 1 node(s)
app_1 | 2017/03/01 08:21:39 main.go:103: - Node YyRepA3vRseVL_DRNoIE7A with IP 172.19.0.2
Notice that Elastic has a dedicated page on Installing Elasticsearch with Docker.
MIT