aws beanstalk 使用eb cli配置和启动环境

Elastic Beanstalk 不额外收费，只需为存储和运行应用程序所需的 AWS 资源付费

EB CLI 是 Amazon Elastic Beanstalk 的命令行界面，它提供了可简化从本地存储库创建、更新和监控环境的交互式命令

安装eb cli

$ pip install virtualenv
$ virtualenv ebvenv
$ source venv/bin/activate
$ (ebvenv) pip install awsebcli --upgrade
$ $ eb --version
EB CLI 3.20.3 (Python 3.7.1)

帮助信息

commands:abort        Cancels an environment update or deployment.appversion   Listing and managing application versionsclone        Clones an environment.codesource   Configures the code source for the EB CLI to use by default.config       Modify an environment's configuration. Use subcommands to manage saved configurations.console      Opens the environment in the AWS Elastic Beanstalk Management Console.create       Creates a new environment.deploy       Deploys your source code to the environment.events       Gets recent events.health       Shows detailed environment health.init         Initializes your directory with the EB CLI. Creates the application.labs         Extra experimental commands.list         Lists all environments.local        Runs commands on your local machine.logs         Gets recent logs.open         Opens the application URL in a browser.platform     Commands for managing platforms.printenv     Shows the environment variables.restore      Restores a terminated environment.scale        Changes the number of running instances.setenv       Sets environment variables.ssh          Opens the SSH client to connect to an instance.status       Gets environment information and status.swap         Swaps two environment CNAMEs with each other.tags         Allows adding, deleting, updating, and listing of environment tags.terminate    Terminates the environment.upgrade      Updates the environment to the most recent platform version.use          Sets default environment.

初始化

初始化eb环境，可以指定凭证profile

$ mkdir test-beangolang && cd test-beangolang
$ eb init
$ #eb init --profile profilename

初始化使用默认的aws凭证，要求选择region，application，ssh，platform（此处选择go）等。新的application默认以当前文件夹名称创建。

初始化完成后在本地生成如下文件。其中config.yml包含配置信息

$ tree -a
.
├── .elasticbeanstalk
│   └── config.yml
└── .gitignore
$ cat .elasticbeanstalk/config.yml
branch-defaults:default:environment: nullgroup_suffix: null
global:application_name: test-beangolangbranch: nulldefault_ec2_keyname: dev-keydefault_platform: Go 1 running on 64bit Amazon Linux 2default_region: cn-north-1include_git_submodules: trueinstance_profile: nullplatform_name: nullplatform_version: nullprofile: nullrepository: nullsc: nullworkspace_type: Application

初始化之后只会创建application，不会启动environment（即实例，负载均衡器，数据库等资源）

高级配置

如果 .ebignore 不存在，但存在 .gitignore，EB CLI 将忽略 .gitignore 中指定的文件。如果存在 .ebignore，EB CLI 将不会读取 .gitignore

eb cli工具的凭证优先级

部署构建而非文件夹

创建环境

$ eb create

环境初始化会选择环境name，dns，lb，是否下载sample，最后启动环境，启动过程中会输出日志

最终所有资源都会通过创建cloudformation的方式进行创建

Would you like to enable Spot Fleet requests for this environment? (y/N): n
NOTE: The current directory does not contain any source code. Elastic Beanstalk is launching the sample application instead.
Do you want to download the sample application into the current directory? (Y/n): y
INFO: Downloading sample application to the current directory.
INFO: Download complete.
Environment details for: test-beangolang-devApplication name: test-beangolangRegion: cn-north-1Deployed Version: Sample ApplicationEnvironment ID: e-254v23ad2mPlatform: arn:aws-cn:elasticbeanstalk:cn-north-1::platform/Go 1 running on 64bit Amazon Linux 2/3.6.1Tier: WebServer-Standard-1.0CNAME: test-beangolang-dev.cn-north-1.eb.amazonaws.com.cnUpdated: 2022-11-13 15:35:24.287000+00:00
Printing Status:
2022-11-13 15:35:23    INFO    createEnvironment is starting.
2022-11-13 15:35:24    INFO    Using elasticbeanstalk-cn-north-1-xxxxxxxxxxxx as Amazon S3 storage bucket for environment data.
2022-11-13 15:35:46    INFO    Created target group named: arn:aws-cn:elasticloadbalancing:cn-north-1:xxxxxxxxxxxx:targetgroup/awseb-test-bea-default-5gkjd/6de4b45758a2fab6
2022-11-13 15:35:46    INFO    Created security group named: awseb-e-254v23ad2m-stack-AWSEBSecurityGroup-1X8RQFJTFG3WA
2022-11-13 15:36:03    INFO    Created Auto Scaling launch configuration named: awseb-e-254v23ad2m-stack-AWSEBAutoScalingLaunchConfiguration-vWQ0HP7XfOUA
2022-11-13 15:36:03    INFO    Created Load Balancer listener rule named: arn:aws-cn:elasticloadbalancing:cn-north-1:xxxxxxxxxxxx:listener-rule/app/main-alb/17ec2f283414a86a/80c5154ba2598551/d2ff9a73b3344c39-- Events -- (safe to Ctrl+C)

下载sample程序，一个简单的go web程序

$ tree
.
├── application.go
├── cron.yaml
└── public└── index.html

查看当前状态和健康状况

$ eb status
Environment details for: test-beangolang-devApplication name: test-beangolangRegion: cn-north-1Deployed Version: Sample ApplicationEnvironment ID: e-254v23ad2mPlatform: arn:aws-cn:elasticbeanstalk:cn-north-1::platform/Go 1 running on 64bit Amazon Linux 2/3.6.1Tier: WebServer-Standard-1.0CNAME: test-beangolang-dev.cn-north-1.eb.amazonaws.com.cnUpdated: 2022-11-13 15:37:06.756000+00:00Status: LaunchingHealth: Grey
$ eb health

查看并修改eb的配置，指定默认编辑器为vim

export EDITOR="vim"
eb config

查看事件输出，包括环境构建，重新部署，配置修改等事件日志，和图形控制台一致

$ eb evnets

查看控制台

无论是在控制台还是通过ebcli工具创建环境，最终都会使用cloudformation创建资源，清单如下

目标组
安全组
启动模板或启动配置
2个cloudwatch告警
2个asg扩展策略
自动扩展组asg

查看下启动模板（nodejs）的userdata部分如下

可以看到对于每种支持的language，都有对应的bootstrap脚本，通过向启动脚本传参实现环境的初始化

Content-Type: multipart/mixed; boundary="===============5189065377222898407=="
MIME-Version: 1.0--===============5189065377222898407==
Content-Type: text/cloud-config; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="cloud-config.txt"#cloud-config
repo_upgrade: none
repo_releasever: 2.0
cloud_final_modules:- [scripts-user, always]--===============5189065377222898407==
Content-Type: text/x-shellscript; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="user-data.txt"#!/bin/bash
exec > >(tee -a /var/log/eb-cfn-init.log|logger -t [eb-cfn-init] -s 2>/dev/console) 2>&1
echo [`date -u +"%Y-%m-%dT%H:%M:%SZ"`] Started EB User Data
set -xfunction sleep_delay
{if (( $SLEEP_TIME < $SLEEP_TIME_MAX )); then echo Sleeping $SLEEP_TIMEsleep $SLEEP_TIME  SLEEP_TIME=$(($SLEEP_TIME * 2)) else echo Sleeping $SLEEP_TIME_MAX  sleep $SLEEP_TIME_MAX  fi
}# Executing bootstrap script
SLEEP_TIME=2
SLEEP_TIME_MAX=3600
while true; do curl https://elasticbeanstalk-platform-assets-public-beta-cn-north-1.s3.cn-north-1.amazonaws.com.cn/stalks/eb_nodejs16_amazon_linux_2_1.0.1696.0_20220929200609/lib/UserDataScript.sh > /tmp/ebbootstrap.sh RESULT=$?if [[ "$RESULT" -ne 0 ]]; then sleep_delay else/bin/bash /tmp/ebbootstrap.sh     'https://cloudformation-waitcondition-cn-north-1.s3.cn-north-1.amazonaws.com.cn/arn%3Aaws-cn%3Acloudformation%3Acn-north-1%3A037047667284%3Astack/awseb-e-tuypgrwuf3-stack/cd3970d0-47e5-11ed-b386-066b31cc2db4/AWSEBInstanceLaunchWaitHandle?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20221009T151948Z&X-Amz-SignedHeaders=host&X-Amz-Expires=86399&X-Amz-Credential=AKIAOMTUJJXMXKXJZEPQ%2F20221009%2Fcn-north-1%2Fs3%2Faws4_request&X-Amz-Signature=6a920d4ee295c755dc47d599cfcb7e87a3885b72f0e3429bdee6a5ed8ab75764'    'arn:aws-cn:cloudformation:cn-north-1:037047667284:stack/awseb-e-tuypgrwuf3-stack/cd3970d0-47e5-11ed-b386-066b31cc2db4'    '52ec14ac-5685-404a-b42e-3b5e92239559'    'https://elasticbeanstalk-health.cn-north-1.amazonaws.com.cn'    ''    'https://elasticbeanstalk-platform-assets-public-beta-cn-north-1.s3.cn-north-1.amazonaws.com.cn/stalks/eb_nodejs16_amazon_linux_2_1.0.1696.0_20220929200609'    'cn-north-1'RESULT=$?if [[ "$RESULT" -ne 0 ]]; then sleep_delay else exit 0  fi fi
done--===============5189065377222898407==--

默认创建的2个告警

对应的event rule

{"source": ["aws.cloudwatch"],"detail-type": ["CloudWatch Alarm State Change"],"resources": ["arn:aws-cn:cloudwatch:cn-north-1:xxxxxxx:alarm:awseb-e-tuypgrwuf3-stack-AWSEBCloudwatchAlarmHigh-xxxxxxxx"]
}

默认创建的两个扩展策略

将asg扩展策略和cw告警联系，当网络请求大于6M/s，就会触发asg扩容1个实例

通过webbench测试加压，eb实例扩容成功

webbench -c 300 -t 60  http://xxxxxxx-xxxxxxxx.cn-north-1.elb.amazonaws.com.cn:xxxxx/