[es] Add NON_DATA type

For #165

elasticsearch/Dockerfile

@@ -4,7 +4,7 @@ LABEL maintainer "itzg"
 
 RUN apk -U add bash
 
-ENV ES_VERSION=5.4.2
+ENV ES_VERSION=5.4.3
 
 ADD https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-$ES_VERSION.tar.gz /tmp/es.tgz
 RUN cd /usr/share && \

elasticsearch/README.md

@@ -181,8 +181,9 @@ To simplify all that, this image provides a `TYPE` variable to let you amongst t
 * `MASTER` : master-eligible, but holds no data. It is good to have three or more of these in a
 large cluster
 * `DATA` (or `NON_MASTER`) : holds data and serves search/index requests. Scale these out for elastic-y goodness.
+* `NON_DATA` : performs all duties except holding data
 * `GATEWAY` (or `COORDINATING`) : only operates as a client node or a "smart router". These are the ones whose HTTP port 9200 will need to be exposed
-* `INGEST` : operates only as an ingest node and is not master or data eligble
+* `INGEST` : operates only as an ingest node and is not master or data eligible
 
 A [Docker Compose](https://docs.docker.com/compose/overview/) file will serve as a good example of these three node types:
 

elasticsearch/docker-compose-3x1GB.yml

@@ -0,0 +1,34 @@
+# This composition is known to work on a Swarm cluster consisting of
+# 3 VM nodes with 1GB allocated to each.
+version: '3'
+
+services:
+  master:
+    image: itzg/elasticsearch
+    environment:
+      UNICAST_HOSTS: master
+      MIN_MASTERS: 1
+      ES_JAVA_OPTS: -Xms756m -Xmx756m
+    ports:
+      - "9200:9200"
+      - "9300:9300"
+    deploy:
+      replicas: 1
+      update_config:
+        parallelism: 1
+  data:
+    image: itzg/elasticsearch
+    deploy:
+      mode: global
+      update_config:
+        parallelism: 1
+    environment:
+      TYPE: DATA
+      UNICAST_HOSTS: master
+      ES_JAVA_OPTS: -Xms512m -Xmx512m
+  kibana:
+    image: kibana
+    ports:
+      - "5601:5601"
+    environment:
+      ELASTICSEARCH_URL: http://master:9200

elasticsearch/start

@@ -99,10 +99,18 @@ setup_personality() {
         OPTS="$OPTS -E node.master=false -E node.data=false -E node.ingest=true"
         ;;
 
-      DATA|NON_MASTER)
+      DATA)
         OPTS="$OPTS -E node.master=false -E node.data=true -E node.ingest=false"
         ;;
 
+      NON_MASTER)
+        OPTS="$OPTS -E node.master=false -E node.data=true -E node.ingest=true"
+        ;;
+
+      NON_DATA)
+        OPTS="$OPTS -E node.master=true -E node.data=false -E node.ingest=true"
+        ;;
+
       *)
         echo "Unknown node type. Please use MASTER|GATEWAY|DATA|NON_MASTER"
         exit 1