Add some beautiful scripts to initialize a CouchDB 2.x cluster automa…

…gically.

examples/compose/cluster-init/Dockerfile

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+FROM alpine:edge
+
+RUN apk add --no-cache curl
+
+COPY wait-for /wait-for
+COPY await-nodes.sh /await-nodes.sh
+COPY init-cluster.sh /init-cluster.sh
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+
+CMD [ "/docker-entrypoint.sh" ]

examples/compose/cluster-init/await-nodes.sh

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+#!/usr/bin/env sh
+
+available_nodes=0
+
+./wait-for 172.16.238.11:5984 -t 10
+result=$?
+if [ ${result} -eq 0 ] ; then
+  available_nodes=$((available_nodes+1))
+fi
+
+./wait-for 172.16.238.12:5984 -t 10
+result=$?
+if [ ${result} -eq 0 ] ; then
+  available_nodes=$((available_nodes+1))
+fi
+
+./wait-for 172.16.238.13:5984 -t 10
+result=$?
+if [ ${result} -eq 0 ] ; then
+  available_nodes=$((available_nodes+1))
+fi
+
+if [ ${available_nodes} -eq 3 ]
+then echo "alright"
+else echo "missing node, got $available_nodes nodes"
+fi

examples/compose/cluster-init/docker-entrypoint.sh

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+#!/usr/bin/env sh
+
+#cat << EOB > .couchdb-env
+#COUCHDB.USERNAME=admin
+#COUCHDB.PASSWORD=password
+#COUCHDB_USER=admin
+#COUCHDB_PASSWORD=password
+#EOB
+#docker-compose -f docker-compose-cluster.yml -p db up
+
+/await-nodes.sh
+/init-cluster.sh

examples/compose/cluster-init/init-cluster.sh

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+#!/usr/bin/env sh
+
+# http://docs.couchdb.org/en/stable/cluster/setup.html
+# http://docs.couchdb.org/en/latest/cluster/setup.html
+
+curl -X PUT http://172.16.238.11:5984/_users
+curl -X PUT http://172.16.238.11:5984/_replicator
+curl -X PUT http://172.16.238.12:5984/_users
+curl -X PUT http://172.16.238.12:5984/_replicator
+curl -X PUT http://172.16.238.13:5984/_users
+curl -X PUT http://172.16.238.13:5984/_replicator
+
+#USERNAME=$(awk 'BEGIN {print ENVIRON["COUCHDB.USERNAME"]}')
+#PASSWORD=$(awk 'BEGIN {print ENVIRON["COUCHDB.PASSWORD"]}')
+
+curl -X PUT http://172.16.238.11:5984/_node/[email protected]/_config/admins/root -d '"a-secret"'
+curl -X PUT http://172.16.238.12:5984/_node/[email protected]/_config/admins/root -d '"a-secret"'
+curl -X PUT http://172.16.238.13:5984/_node/[email protected]/_config/admins/root -d '"a-secret"'
+
+#curl --user root:a-secret -X POST http://172.16.238.11:5984/_cluster_setup -H "content-type:application/json" -d '{"action":"enable_cluster","username":"root","password":"a-secret","bind_address":"0.0.0.0","node_count":3}'
+
+curl --user root:a-secret -X POST http://172.16.238.11:5984/_cluster_setup -H "content-type:application/json" -d '{"remote_node":"172.16.238.12","port":"5984","action":"enable_cluster","username":"root","password":"a-secret","bind_address":"0.0.0.0","node_count":3}'
+curl --user root:a-secret -X POST http://172.16.238.11:5984/_cluster_setup -H "content-type:application/json" -d '{"remote_node":"172.16.238.13","port":"5984","action":"enable_cluster","username":"root","password":"a-secret","bind_address":"0.0.0.0","node_count":3}'
+
+curl --user root:a-secret -X POST http://172.16.238.11:5984/_cluster_setup -H "content-type:application/json" -d '{"action":"add_node","host":"172.16.238.12","port":"5984","username":"root","password":"a-secret"}'
+curl --user root:a-secret -X POST http://172.16.238.11:5984/_cluster_setup -H "content-type:application/json" -d '{"action":"add_node","host":"172.16.238.13","port":"5984","username":"root","password":"a-secret"}'
+
+curl --user root:a-secret -X POST http://172.16.238.11:5984/_cluster_setup -H "Content-Type: application/json" -d '{"action": "finish_cluster"}'
+
+curl --user root:a-secret -X GET http://172.16.238.11:5984/_membership

examples/compose/cluster-init/wait-for

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+#!/bin/sh
+
+TIMEOUT=15
+QUIET=0
+
+echoerr() {
+  if [ "$QUIET" -ne 1 ]; then printf "%s\n" "$*" 1>&2; fi
+}
+
+usage() {
+  exitcode="$1"
+  cat << USAGE >&2
+Usage:
+  $cmdname host:port [-t timeout] [-- command args]
+  -q | --quiet                        Do not output any status messages
+  -t TIMEOUT | --timeout=timeout      Timeout in seconds, zero for no timeout
+  -- COMMAND ARGS                     Execute command with args after the test finishes
+USAGE
+  exit "$exitcode"
+}
+
+wait_for() {
+  for i in `seq $TIMEOUT` ; do
+    nc -z "$HOST" "$PORT" > /dev/null 2>&1
+
+    result=$?
+    if [ $result -eq 0 ] ; then
+      if [ $# -gt 0 ] ; then
+        exec "$@"
+      fi
+      exit 0
+    fi
+    sleep 1
+  done
+  echo "Operation timed out" >&2
+  exit 1
+}
+
+while [ $# -gt 0 ]
+do
+  case "$1" in
+    *:* )
+    HOST=$(printf "%s\n" "$1"| cut -d : -f 1)
+    PORT=$(printf "%s\n" "$1"| cut -d : -f 2)
+    shift 1
+    ;;
+    -q | --quiet)
+    QUIET=1
+    shift 1
+    ;;
+    -t)
+    TIMEOUT="$2"
+    if [ "$TIMEOUT" = "" ]; then break; fi
+    shift 2
+    ;;
+    --timeout=*)
+    TIMEOUT="${1#*=}"
+    shift 1
+    ;;
+    --)
+    shift
+    break
+    ;;
+    --help)
+    usage 0
+    ;;
+    *)
+    echoerr "Unknown argument: $1"
+    usage 1
+    ;;
+  esac
+done
+
+if [ "$HOST" = "" -o "$PORT" = "" ]; then
+  echoerr "Error: you need to provide a host and port to test."
+  usage 2
+fi
+
+wait_for "$@"

examples/compose/docker-compose-cluster.yml

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+version: "2.3"
+
+services:
+  couchdb1:
+    image: apache/couchdb:2.1.1
+    command: -name [email protected] -setcookie thecookie
+    env_file: .couchdb-env
+    restart: always
+    networks:
+      couchdb-cluster:
+        ipv4_address: 172.16.238.11
+    ports:
+      - "15984:5984"
+
+  couchdb2:
+    image: apache/couchdb:2.1.1
+    command: -name [email protected] -setcookie thecookie
+    env_file: .couchdb-env
+    restart: always
+    networks:
+      couchdb-cluster:
+        ipv4_address: 172.16.238.12
+    ports:
+      - "25984:5984"
+
+  couchdb3:
+    image: apache/couchdb:2.1.1
+    command: -name [email protected] -setcookie thecookie
+    env_file: .couchdb-env
+    restart: always
+    networks:
+      couchdb-cluster:
+        ipv4_address: 172.16.238.13
+    ports:
+      - "35984:5984"
+
+  couchdbstats:
+    image: gesellix/couchdb-prometheus-exporter
+    command: -couchdb.uri=http://couchdb1:5984 -logtostderr
+    env_file: .couchdb-env
+    networks:
+      couchdb-cluster:
+        ipv4_address: 172.16.238.10
+    ports:
+      - "9984:9984"
+
+  cluster-init:
+    image: cluster-init
+    networks:
+      couchdb-cluster:
+        ipv4_address: 172.16.238.99
+
+networks:
+  couchdb-cluster:
+   driver: overlay
+   ipam:
+    driver: default
+    config:
+      - subnet: "172.16.238.0/24"