Docker用のカスタムAMIを使うためにダミーのアプリケーションに仕込んでおく.ebextensions

00-preinit.config

---
commands:

    01-yum-security-update:
        command: /usr/bin/yum update -y --security --bugfix --skip-broken
        ignoreErrors: true

    02-backup-original-hooks:
        command: /bin/cp -vpRP /opt/elasticbeanstalk/hooks /opt/elasticbeanstalk/hooks.org
        ignoreErrors: true

01-make-upstart.config

---
files:

    "/etc/init/sample-docker-app.conf" :
        mode: 755
        owner: root
        group: root
        content: |
            description "Elastic Beanstalk Docker Container sample-docker-app"

            start on started docker
            stop on stopping docker

            respawn

            script
                # "play-scala-intro" is *exmaple*. This must be replaced with real container name.
                CONTAINER_NAME="play-scala-intro"

                # Wait for docker to finish starting up first.
                FILE=/var/run/docker.sock
                while [ ! -e ${FILE} ]; do
                    sleep 2
                done

                DOCKER_APP_FILE=/etc/elasticbeanstalk/.aws_beanstalk.current-container-id
                CONTAINER_ID=$(docker ps --no-trunc -a| grep ${CONTAINER_NAME} | cut -d" " -f1)
                if ! docker ps | grep -q ${CONTAINER_ID} ; then
                    docker start ${CONTAINER_ID} > ${DOCKER_APP_FILE}
                fi

                NGINX_UPSTREAM_IP=$(docker inspect ${CONTAINER_ID} | jq ".[0].NetworkSettings.IPAddress" --raw-output)
                # "9000" is *example*. This must be replaced with real application settings.
                NGINX_UPSTREAM_PORT=9000

                DOCKER_PORT_FILE=/etc/elasticbeanstalk/.aws_beanstalk.container-port
                if ! cat /etc/nginx/conf.d/elasticbeanstalk-nginx-docker-upstream.conf | grep -q $NGINX_UPSTREAM_IP; then
                    sed -i.$(date '+%Y%m%d%H%M%S.%Z')  \
                        "s/server.*;/server ${NGINX_UPSTREAM_IP}:${NGINX_UPSTREAM_PORT};/" \
                        /etc/nginx/conf.d/elasticbeanstalk-nginx-docker-upstream.conf
                    service nginx restart
                fi
                echo ${NGINX_UPSTREAM_PORT} > ${DOCKER_PORT_FILE}

                mkdir -p /var/log/eb-docker/containers/eb-current-app
                docker logs -f ${CONTAINER_ID} > /var/log/eb-docker/containers/eb-current-app/${CONTAINER_ID:0:12}-stdouterr.log 2>&1

                exec docker wait ${CONTAINER_ID}
            end script

            post-stop script
                CONTAINER_ID=$(docker ps --no-trunc | grep 'play-scala-intro' | cut -f1 -d' ')

                if [ -n "${CONTAINER_ID}" ] ; then
                    docker stop ${CONTAINER_ID}
                fi
            end script

02-modified-eb-hooks.config

---
commands:
    01-modified-hooks-restartappserver-enact:
        command: |
            /bin/sed -i \
                -e "/^stop_upstart_service eb-docker/a stop_upstart_service sample-docker-app || true" \
                -e "s/^start_upstart_service eb-docker/start_upstart_service sample-docker-app/" \
                /opt/elasticbeanstalk/hooks/restartappserver/enact/01restart.sh
        ignoreErrors: true

03-run-dummy-app.config

---
commands:

    01-run-dummy-app:
        command: |
            /usr/bin/docker ps -a | grep -q 'play-scala-intro' || \
            /usr/bin/docker run -d \
                -p 22812:2812 \
                --name play-scala-intro \
                -v /etc/localtime:/etc/localtime:ro \
                sgykfjsm/play-scala-intro
        cwd: /home/ec2-user
        ignoreErrors: false

04-make-eb-hooks.config

---
files:

    "/opt/elasticbeanstalk/hook/appdeploy/enact/99run-dummy.sh" :
        mode: 755
        owner: root
        group: root
        content: |
            #!/bin/bash
            set -e
            . /opt/elasticbeanstalk/hooks/common.sh
            /opt/elasticbeanstalk/hook/restartappserver/enact/01restart

    "/opt/elasticbeanstalk/hook/configdeploy/post/99run-dummy.sh" :
        mode: 755
        owner: root
        group: root
        content: |
            #!/bin/bash
            set -e
            . /opt/elasticbeanstalk/hooks/common.sh
            # TODO: pickup config update
            /opt/elasticbeanstalk/hook/restartappserver/enact/01restart

これがダメなところ

• configdeployに対応していない。
• 色んなモノをベタ書きしている。
• eb_dockerを(ほぼ)放置している。
• 特定のAMIのバージョンでしか使えない。

実験的なものなので、これを実運用で使ってはならない。