[es] Added HEALTHCHECK

For #124

elasticsearch/Dockerfile

@@ -4,7 +4,7 @@ MAINTAINER itzg
 
 RUN apk -U add bash
 
-ENV ES_VERSION=5.1.1
+ENV ES_VERSION=5.2.0
 
 ADD https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-$ES_VERSION.tar.gz /tmp/es.tgz
 RUN cd /usr/share && \
@@ -13,10 +13,10 @@ RUN cd /usr/share && \
 
 EXPOSE 9200 9300
 
+HEALTHCHECK --timeout=5s CMD wget -q -O - http://$HOSTNAME:9200/_cat/health
+
 ENV ES_HOME=/usr/share/elasticsearch-$ES_VERSION \
     DEFAULT_ES_USER=elasticsearch \
-    DISCOVER_TRANSPORT_IP=eth0 \
-    DISCOVER_HTTP_IP=eth0 \
     ES_JAVA_OPTS="-Xms1g -Xmx1g"
 
 RUN adduser -S -s /bin/sh $DEFAULT_ES_USER

elasticsearch/README.md

@@ -54,6 +54,40 @@ and then check the cluster health, such as http://192.168.99.100:9200/_cluster/h
       "unassigned_shards" : 0
     }
 
+If you have a Docker Swarm cluster already initialized you can download this
+[docker-compose.yml](https://raw.githubusercontent.com/itzg/dockerfiles/master/elasticsearch/docker-compose.yml) and deploy a cluster using:
+
+    docker stack deploy -c docker-compose.yml es
+
+
+With a `docker service ls` you can confirm 1 master, 2 data, and 1 gateway nodes are running:
+
+```
+ID            NAME        MODE        REPLICAS  IMAGE
+9nwnno8hbqgk  es_kibana   replicated  1/1       kibana:latest
+f5x7nipwmvkr  es_gateway  replicated  1/1       es
+om8rly2yxylw  es_data     replicated  2/2       es
+tdvfilj370yn  es_master   replicated  1/1       es
+```
+
+As you can see, there is also a Kibana instance included and available at port 5601.
+
+# Health Checks
+
+This container declares a [HEALTHCHECK](https://docs.docker.com/engine/reference/builder/#/healthcheck) that queries the `_cat/health`
+endpoint for a quick, one-line gauge of health every 30 seconds.
+
+The current health of the container is shown in the `STATUS` column of `docker ps`, such as
+
+    Up 14 minutes (healthy)
+
+You can also check the history of health checks from `inspect`, such as:
+
+```
+> docker inspect -f "{{json .State.Health}}" es
+{"Status":"healthy","FailingStreak":0,"Log":[...
+```
+
 # Configuration Summary
 
 ## Ports
@@ -187,20 +221,16 @@ Using the Docker Compose file above, a value of `2` is appropriate when scaling
 
     docker-compose scale master=3
 
-## Auto transport/http discovery with Swarm Mode
+## Multiple Network Binding, such as Swarm Mode
 
-When using Docker Swarm mode (starting with 1.12), the overlay and ingress network interfaces are assigned
-multiple IP addresses. As a result, it creates confusion for the transport publish logic even when using
-the special value `_eth0_`.
+When using Docker Swarm mode the container is presented with multiple ethernet
+devices. By default, all global, routable IP addresses are configured for
+Elasticsearch to use as `network.host`.
 
-To resolve this, add
+That discovery can be overridden by providing a specific ethernet device name
+to `DISCOVER_TRANSPORT_IP` and/or `DISCOVER_HTTP_IP`, such as
 
     -e DISCOVER_TRANSPORT_IP=eth0
-
-replacing `eth0` with another interface within the container, if needed.
-
-The same can be done for publish/binding of the http module by adding:
-
     -e DISCOVER_HTTP_IP=eth2
 
 ## Heap size and other JVM options

elasticsearch/docker-compose.yml

@@ -0,0 +1,37 @@
+version: '3'
+
+services:
+  master:
+    image: itzg/elasticsearch
+    environment:
+      TYPE: MASTER
+      UNICAST_HOSTS: master
+      MIN_MASTERS: 1
+    deploy:
+      replicas: 1
+      update_config:
+        parallelism: 1
+  data:
+    image: itzg/elasticsearch
+    environment:
+      TYPE: DATA
+      UNICAST_HOSTS: master
+    deploy:
+      replicas: 2
+      update_config:
+        parallelism: 1
+        delay: 60s
+  gateway:
+    image: itzg/elasticsearch
+    ports:
+      - "9200:9200"
+      - "9300:9300"
+    environment:
+      TYPE: GATEWAY
+      UNICAST_HOSTS: master
+  kibana:
+    image: kibana
+    ports:
+      - "5601:5601"
+    environment:
+      ELASTICSEARCH_URL: http://gateway:9200

elasticsearch/start

@@ -19,6 +19,11 @@ discoverIpFromLink() {
   OPTS="$OPTS -E $mode.host=$ip"
 }
 
+discoverAllGlobalIps() {
+  ips=`ipaddr show scope global|awk '$1 == "inet" { if (!match($2,"/32")) { gsub("/.*","",$2) ; addrs[length(addrs)] = $2 } } END { for (i in addrs) { if (i>0) printf "," ; printf addrs[i] } }'`
+  OPTS="$OPTS -E network.host=$ips"
+}
+
 setup_clustering() {
 
   if [ -n "$CLUSTER" ]; then
@@ -112,8 +117,13 @@ OPTS="$OPTS \
   -E transport.tcp.port=9300 \
   -E http.port=9200"
 
-discoverIpFromLink $DISCOVER_TRANSPORT_IP transport
-discoverIpFromLink $DISCOVER_HTTP_IP http
+discoverAllGlobalIps
+if [ "${DISCOVER_TRANSPORT_IP}" != "" ]; then
+  discoverIpFromLink $DISCOVER_TRANSPORT_IP transport
+fi
+if [ "${DISCOVER_HTTP_IP}" != "" ]; then
+  discoverIpFromLink $DISCOVER_HTTP_IP http
+fi
 
 setup_personality
 setup_clustering

kibana/Dockerfile

@@ -2,7 +2,7 @@ FROM openjdk:8u111-jre
 
 MAINTAINER itzg
 
-ENV KIBANA_VERSION 5.1.1
+ENV KIBANA_VERSION 5.1.2
 
 ADD https://artifacts.elastic.co/downloads/kibana/kibana-${KIBANA_VERSION}-linux-x86_64.tar.gz /tmp/kibana.tgz
 

kibana/docker-compose-test.yml

@@ -0,0 +1,12 @@
+version: '2'
+
+services:
+  es:
+    build: ../elasticsearch
+    ports:
+      - "9200:9200"
+
+  kibana:
+    build: .
+    ports:
+      - "5601:5601"

minecraft-server/Dockerfile

@@ -1,4 +1,4 @@
-FROM java:8
+FROM openjdk:8-jre
 
 MAINTAINER itzg