Revert "Revert "Set ELK components version from .env file" (#206)" (#303)

This reverts commit 8f5b242d6a.

.env

@@ -0,0 +1 @@
+ELK_VERSION=6.3.0

README.md

@@ -43,12 +43,14 @@ Based on the official Docker images from Elastic:
 6. [JVM tuning](#jvm-tuning)
    * [How can I specify the amount of memory used by a service?](#how-can-i-specify-the-amount-of-memory-used-by-a-service)
    * [How can I enable a remote JMX connection to a service?](#how-can-i-enable-a-remote-jmx-connection-to-a-service)
+7. [Updates](#updates)
+   * [Using a newer stack version](#using-a-newer-stack-version)
 
 ## Requirements
 
 ### Host setup
 
-1. Install [Docker](https://www.docker.com/community-edition#/download) version **1.10.0+**
+1. Install [Docker](https://www.docker.com/community-edition#/download) version **17.03+**
 2. Install [Docker Compose](https://docs.docker.com/compose/install/) version **1.6.0+**
 3. Clone this repository
 
@@ -257,3 +259,18 @@ logstash:
   environment:
     LS_JAVA_OPTS: "-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.port=18080 -Dcom.sun.management.jmxremote.rmi.port=18080 -Djava.rmi.server.hostname=DOCKER_HOST_IP -Dcom.sun.management.jmxremote.local.only=false"
 ```
+
+## Updates
+
+### Using a newer stack version
+
+To use a different Elastic Stack version than the one currently available in the repository, simply change the version
+number inside the `.env` file, and rebuild the stack with:
+
+```console
+$ docker-compose build
+$ docker-compose up
+```
+
+**NOTE**: Always pay attention to the [upgrade instructions](https://www.elastic.co/guide/en/elasticsearch/reference/current/setup-upgrade.html)
+for each individual component before performing a stack upgrade.

docker-compose.yml

@@ -5,6 +5,8 @@ services:
   elasticsearch:
     build:
       context: elasticsearch/
+      args:
+        ELK_VERSION: $ELK_VERSION
     volumes:
       - ./elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml:ro
     ports:
@@ -18,6 +20,8 @@ services:
   logstash:
     build:
       context: logstash/
+      args:
+        ELK_VERSION: $ELK_VERSION
     volumes:
       - ./logstash/config/logstash.yml:/usr/share/logstash/config/logstash.yml:ro
       - ./logstash/pipeline:/usr/share/logstash/pipeline:ro
@@ -33,6 +37,8 @@ services:
   kibana:
     build:
       context: kibana/
+      args:
+        ELK_VERSION: $ELK_VERSION
     volumes:
       - ./kibana/config/:/usr/share/kibana/config:ro
     ports:

elasticsearch/Dockerfile

@@ -1,5 +1,7 @@
+ARG ELK_VERSION
+
 # https://github.com/elastic/elasticsearch-docker
-FROM docker.elastic.co/elasticsearch/elasticsearch-oss:6.3.0
+FROM docker.elastic.co/elasticsearch/elasticsearch-oss:${ELK_VERSION}
 
 # Add your elasticsearch plugins setup here
 # Example: RUN elasticsearch-plugin install analysis-icu

kibana/Dockerfile

@@ -1,5 +1,7 @@
+ARG ELK_VERSION
+
 # https://github.com/elastic/kibana-docker
-FROM docker.elastic.co/kibana/kibana-oss:6.3.0
+FROM docker.elastic.co/kibana/kibana-oss:${ELK_VERSION}
 
 # Add your kibana plugins setup here
 # Example: RUN kibana-plugin install <name|url>

logstash/Dockerfile

@@ -1,5 +1,7 @@
+ARG ELK_VERSION
+
 # https://github.com/elastic/logstash-docker
-FROM docker.elastic.co/logstash/logstash-oss:6.3.0
+FROM docker.elastic.co/logstash/logstash-oss:${ELK_VERSION}
 
 # Add your logstash plugins setup here
 # Example: RUN logstash-plugin install logstash-filter-json