Docker compose clouseau example

clouseau-compose/README.md

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+standard `docker-compose.yml`.
+
+```shell
+mkdir -p ./config/{couchdb,clouseau}
+```
+
+**./config/clouseau/clouseau.ini**
+```ini
+[clouseau]
+[email protected]
+cookie=monster
+dir=/data
+max_indexes_open=500
+```
+
+**./config/clouseau/log4j.properties**
+```
+log4j.rootLogger=debug, CONSOLE
+log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
+log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
+log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %c [%p] %m%n
+```
+
+**./config/couchdb/local.ini**
+```ini
+[couch_httpd_auth]
+secret = dev
+
+[admins]
+; admin = admin
+admin = -pbkdf2-37aa363808ec5b83fc71cf2811479fbf1917f43d,2483e8ffe206819712f3bd1ba2308d41,10
+```
+
+```shell
+curl -sSL -o clouseau-2.17.0-dist.zip "https://github.com/cloudant-labs/clouseau/releases/download/2.17.0/clouseau-2.17.0-dist.zip
+# Unizp clouseau-2.17.0-dist.zip in clouseau-2.17.0
+```
+
+**docker-compose.yml**
+*This yaml expose 5984 to the host network, if you already using the 5984 change it on the yaml
+```yaml
+version: '3.8'
+services:
+  couchdb1:
+    image: couchdb:3.1.0
+    restart: always
+    ports:
+    - 5984:5984
+    environment:
+      - NODENAME=10.0.0.10
+      - ERL_FLAGS=-setcookie monster
+    volumes:
+    - ./config/couchdb:/opt/couchdb/etc/local.d
+    - ./data/couchdb/1:/opt/couchdb/data
+    networks:
+      couchdb-net:
+        ipv4_address: 10.0.0.10
+
+  clouseau1:
+    image: openjdk:8
+    command: >
+      java -server
+      -classpath '/app/*'
+      -Xmx2G -Dsun.net.inetaddr.ttl=30
+      -Dsun.net.inetaddr.negative.ttl=30
+      -Dlog4j.configuration=file:/config/log4j.properties
+      -XX:OnOutOfMemoryError="kill -9 %p"
+      -XX:+UseConcMarkSweepGC
+      -XX:+CMSParallelRemarkEnabled com.cloudant.clouseau.Main /config/clouseau.ini
+    restart: always
+    depends_on:
+    - couchdb1
+    volumes:
+    - ./config/clouseau:/config
+    - ./data/clouseau/1:/data
+    - ./clouseau-2.17.0:/app
+    network_mode: service:couchdb1
+
+networks:
+  couchdb-net:
+    name: couchdb-net
+    driver: bridge
+    ipam:
+      config:
+        - subnet: 10.0.0.0/24
+```
+
+```shell
+docker-compose up
+```
+
+Check it http://127.0.0.1:5984
+
+The _trick_ is the `network_mode: service:couchdb1` in the the service `clouseau1`. With this we are telling `clouseau1` service to use the same network of `couchdb1` service. So the ports (4369/epmd) are mapped to the clouseau1 container. For simplicity I just deploy one node, but we can add more easily, join them and deploy a loadbalancer with nginx/haproxy in the same `docker-compose.yml`