基本上,您需要在您的 EC2 实例中安装 Docker 和 nginx(作为 Web 代理)。然后,下载 Web 应用存档并进行部署。这就是 Elastic Beanstalk 所做的。
对于用于部署单个 docker 容器 Web 应用程序的基本/最少用户数据:
#!/bin/bash
IMG_LABEL=myapp
APP_INIT_URL=https://s3.amazonaws.com/your-bucket-app/myapp-init.tar.gz
function prepare_instance {
apt-get -y update
apt-get -y install nginx
curl -sSL https://get.docker.com/ | sh
mkdir /opt
curl -o /opt/deployer.sh http://169.254.169.254/latest/user-data
chmod 775 /opt/deployer.sh
}
function download_app {
curl -o /tmp/current.tar.gz $1
rm -rf /opt/app
mkdir -p /opt/app
tar zxvf /tmp/current.tar.gz -C /opt/app
rm /tmp/current.tar.gz
}
function build_image {
docker tag ${IMG_LABEL}:latest ${IMG_LABEL}:prev || echo "No built app"
docker build -t ${IMG_LABEL}:latest /opt/app
}
function run_container {
APP_CID=$(docker run -d ${IMG_LABEL}:latest)
APP_IP=$(docker inspect --format '{{ .NetworkSettings.IPAddress }}' ${APP_CID})
}
function setup_proxy {
rm /etc/nginx/sites-enabled/*
cat <<EOT > /etc/nginx/sites-enabled/app.conf
map \$http_upgrade \$connection_upgrade {
default upgrade;
'' close;
}
upstream app.local {
server ${APP_IP};
}
server {
listen 80;
location / {
proxy_pass http://app.local;
include /etc/nginx/proxy_params;
proxy_http_version 1.1;
proxy_set_header Upgrade \$http_upgrade;
proxy_set_header Connection \$connection_upgrade;
}
}
EOT
service nginx reload
}
function destroy_previous {
(docker ps -a --before="${APP_CID}" | awk '{ print $1,$2 }' | grep "${IMG_LABEL}" | awk '{print $1 }' | xargs -I {} docker stop {} | xargs -I {} docker rm {}) || echo "No previous container"
docker rmi ${IMG_LABEL}:prev || echo "No previous image"
}
if [ ! -f /opt/deployer.sh ];
then
prepare_instance
download_app ${APP_INIT_URL}
else
download_app $1
fi
build_image
run_container
setup_proxy
destroy_previous
在 Elastic Beanstalk 中,有一个代理来侦听更新请求。但是,为了简单起见,我们可以调用上面的脚本通过 SSH 部署一个新的 web 应用程序版本:
ssh ubuntu@ec2-107-123-123-123.compute-1.amazonaws.com 'sudo /opt/deployer.sh https://s3.amazonaws.com/your-bucket-app/myapp-201510122341.tar.gz'
注意:我在 Ubuntu 14.04 中使用 EC2 实例。