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redgeoffredgeoff
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‎Dockerfile

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@@ -47,11 +47,24 @@ COPY ./docker-entrypoint.sh /
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RUN mkdir /home/couchdb/couchdb/data /home/couchdb/couchdb/etc/default.d \
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&& chown -R couchdb:couchdb /home/couchdb/couchdb/
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# Install nodejs
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RUN curl -sL https://deb.nodesource.com/setup_7.x | bash - \
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&& apt-get install -y nodejs \
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&& npm install npm -g
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# docker-discover-tasks helps the nodes discover each other
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RUN npm install -g docker-discover-tasks
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WORKDIR /home/couchdb/couchdb
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EXPOSE 5984 4369 9100-9200
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VOLUME ["/home/couchdb/couchdb/data"]
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ENTRYPOINT ["tini", "--", "/docker-entrypoint.sh"]
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CMD ["/home/couchdb/couchdb/bin/couchdb"]
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COPY couchdb-process.sh /couchdb-process.sh
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COPY discover-process.sh /discover-process.sh
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COPY set-up-process.sh /set-up-process.sh
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COPY wait-for-it.sh /wait-for-it.sh
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COPY wrapper.sh /wrapper.sh
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CMD ["/wrapper.sh"]

‎README.md

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@@ -1,2 +1,26 @@
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# couchdb-docker-service
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CouchDB as a docker swarm service
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TODO
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---
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docker swarm init --advertise-addr
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docker network create \
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--driver overlay \
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--subnet 10.0.9.0/24 \
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--opt encrypted \
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couchdb-network
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docker service create --replicas 2 --name couchdb --network couchdb-network \
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-p 5984:5984 \
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-e COUCHDB_COOKIE="mycookie" \
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-e COUCHDB_USER="admin" \
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-e COUCHDB_PASSWORD="admin" \
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-e COUCHDB_HASHED_PASSWORD="-pbkdf2-b1eb7a68b0778a529c68d30749954e9e430417fb,4da0f8f1d98ce649a9c5a3845241ae24,10" \
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-e COUCHDB_SECRET="mysecret" \
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-e NODENAME="{{.Service.Name}}{{.Task.Slot}}" \
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-e SERVICE_NAME="{{.Service.Name}}" \
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-e TASK_SLOT="{{.Task.Slot}}" \
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--hostname="couchdb{{.Task.Slot}}" \
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redgeoff/couchdb

‎couchdb-process.sh

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#!/bin/bash
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/docker-entrypoint.sh /home/couchdb/couchdb/bin/couchdb

‎discover-process.sh

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#!/bin/bash
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docker-discover-tasks -s $SERVICE_NAME -p 3000 > /var/log/docker-discover-tasks.log

‎docker-entrypoint.sh

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@@ -14,7 +14,7 @@ if [ "$1" = '/home/couchdb/couchdb/bin/couchdb' ]; then
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fi
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fi
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if [ "$COUCHDB_USER" ] && [ "$COUCHDB_PASSWORD" ] && [ -z "$COUCHDB_SYNC_ADMINS_NODE" ]; then
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if [ "$COUCHDB_USER" ] && [ "$COUCHDB_PASSWORD" ] && [ -z "$COUCHDB_HASHED_PASSWORD" ]; then
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# Create admin
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printf "[admins]\n%s = %s\n" "$COUCHDB_USER" "$COUCHDB_PASSWORD" > /home/couchdb/couchdb/etc/local.d/docker.ini
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chown couchdb:couchdb /home/couchdb/couchdb/etc/local.d/docker.ini

‎set-up-process.sh

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#!/bin/bash
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# The primary node is couchdb1 and is the single node with which all secondary nodes register their
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# membership. The primary node and secondary node designation only really matters during the setup
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# process and is only used to implement a scalable service architecture.
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if [ $TASK_SLOT -eq 1 ]; then
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echo "Setting up primary node..."
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# TODO: check couchdb1:5984/_users to make sure DB doesn't already exist before executing the
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# following
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# Create system databases
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curl -X PUT http://$COUCHDB_USER:$COUCHDB_PASSWORD@couchdb1:5984/_users
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curl -X PUT http://$COUCHDB_USER:$COUCHDB_PASSWORD@couchdb1:5984/_replicator
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curl -X PUT http://$COUCHDB_USER:$COUCHDB_PASSWORD@couchdb1:5984/_global_changes
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else
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echo "Setting up secondary node..."
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# Register membership
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curl -X PUT http://$COUCHDB_USER:$COUCHDB_PASSWORD@couchdb1:5986/_nodes/couchdb@couchdb$TASK_SLOT -d {}
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fi

‎wait-for-it.sh

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#!/usr/bin/env bash
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# Use this script to test if a given TCP host/port are available
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cmdname=$(basename $0)
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echoerr() { if [[ $QUIET -ne 1 ]]; then echo "$@" 1>&2; fi }
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usage()
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{
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cat << USAGE >&2
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Usage:
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$cmdname host:port [-s] [-t timeout] [-- command args]
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-h HOST | --host=HOST Host or IP under test
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-p PORT | --port=PORT TCP port under test
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Alternatively, you specify the host and port as host:port
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-s | --strict Only execute subcommand if the test succeeds
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-q | --quiet Don't output any status messages
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-t TIMEOUT | --timeout=TIMEOUT
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Timeout in seconds, zero for no timeout
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-- COMMAND ARGS Execute command with args after the test finishes
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USAGE
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exit 1
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}
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wait_for()
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{
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if [[ $TIMEOUT -gt 0 ]]; then
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echoerr "$cmdname: waiting $TIMEOUT seconds for $HOST:$PORT"
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else
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echoerr "$cmdname: waiting for $HOST:$PORT without a timeout"
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fi
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start_ts=$(date +%s)
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while :
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do
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(echo > /dev/tcp/$HOST/$PORT) >/dev/null 2>&1
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result=$?
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if [[ $result -eq 0 ]]; then
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end_ts=$(date +%s)
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echoerr "$cmdname: $HOST:$PORT is available after $((end_ts - start_ts)) seconds"
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break
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fi
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sleep 1
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done
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return $result
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}
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wait_for_wrapper()
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{
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# In order to support SIGINT during timeout: http://unix.stackexchange.com/a/57692
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if [[ $QUIET -eq 1 ]]; then
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timeout $TIMEOUT $0 --quiet --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
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else
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timeout $TIMEOUT $0 --child --host=$HOST --port=$PORT --timeout=$TIMEOUT &
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fi
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PID=$!
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trap "kill -INT -$PID" INT
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wait $PID
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RESULT=$?
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if [[ $RESULT -ne 0 ]]; then
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echoerr "$cmdname: timeout occurred after waiting $TIMEOUT seconds for $HOST:$PORT"
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fi
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return $RESULT
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}
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# process arguments
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while [[ $# -gt 0 ]]
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do
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case "$1" in
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*:* )
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hostport=(${1//:/ })
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HOST=${hostport[0]}
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PORT=${hostport[1]}
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shift 1
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;;
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--child)
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CHILD=1
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shift 1
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;;
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-q | --quiet)
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QUIET=1
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shift 1
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;;
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-s | --strict)
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STRICT=1
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shift 1
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;;
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-h)
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HOST="$2"
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if [[ $HOST == "" ]]; then break; fi
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shift 2
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;;
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--host=*)
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HOST="${1#*=}"
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shift 1
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;;
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-p)
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PORT="$2"
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if [[ $PORT == "" ]]; then break; fi
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shift 2
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;;
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--port=*)
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PORT="${1#*=}"
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shift 1
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;;
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-t)
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TIMEOUT="$2"
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if [[ $TIMEOUT == "" ]]; then break; fi
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shift 2
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;;
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--timeout=*)
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TIMEOUT="${1#*=}"
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shift 1
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;;
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--)
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shift
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CLI="$@"
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break
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;;
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--help)
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usage
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;;
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*)
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echoerr "Unknown argument: $1"
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usage
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;;
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esac
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done
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if [[ "$HOST" == "" || "$PORT" == "" ]]; then
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echoerr "Error: you need to provide a host and port to test."
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usage
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fi
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TIMEOUT=${TIMEOUT:-15}
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STRICT=${STRICT:-0}
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CHILD=${CHILD:-0}
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QUIET=${QUIET:-0}
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if [[ $CHILD -gt 0 ]]; then
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wait_for
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RESULT=$?
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exit $RESULT
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else
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if [[ $TIMEOUT -gt 0 ]]; then
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wait_for_wrapper
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RESULT=$?
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else
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wait_for
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RESULT=$?
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fi
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fi
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if [[ $CLI != "" ]]; then
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if [[ $RESULT -ne 0 && $STRICT -eq 1 ]]; then
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echoerr "$cmdname: strict mode, refusing to execute subprocess"
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exit $RESULT
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fi
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exec $CLI
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else
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exit $RESULT
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fi

‎wrapper.sh

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#!/bin/bash
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# Adaptation of https://docs.docker.com/engine/admin/multi-service_container/
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# Start the discover process
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/discover-process.sh &
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status=$?
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if [ $status -ne 0 ]; then
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echo "Failed to start discover-process: $status"
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exit $status
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fi
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# Start the couchdb process
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/couchdb-process.sh &
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status=$?
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if [ $status -ne 0 ]; then
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echo "Failed to start couchdb-process: $status"
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exit $status
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fi
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# Start the set-up process in the foreground after the couchdb1 is ready. We expect this process to
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# complete and then the script will continue on and monitor the other 2 processes.
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/wait-for-it.sh couchdb1:5984 -t 300 -- /set-up-process.sh
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# Naive check runs checks once a minute to see if either of the processes exited. The container will
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# exit with an error
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while /bin/true; do
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DISCOVER_STATUS=$(ps aux | grep discover-process | grep -v grep | wc -l)
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COUCHDB_STATUS=$(ps aux | grep couchdb-process | grep -v grep | wc -l)
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# If the greps above find anything, they will exit with 0 status
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# If they are not both 0, then something is wrong
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if [ $DISCOVER_STATUS -ne 1 ]; then
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echo "discover-process has exited."
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exit -1
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fi
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if [ $COUCHDB_STATUS -ne 1 ]; then
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echo "couchdb-processes has exited."
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exit -1
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fi
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sleep 30
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done

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