Elastic Beanstalk

1# cron.yaml — scheduled tasks for Worker environment
2version: 1
3cron:
4  - name: "DailyReport"
5    url: "/tasks/daily-report"
6    schedule: "0 8 * * *"    # 8 AM UTC daily
7  - name: "HourlySync"
8    url: "/tasks/sync"
9    schedule: "0 * * * *"   # every hour

1# Swap environment URLs (Blue/Green cutover)
2aws elasticbeanstalk swap-environment-cnames   --source-environment-name myapp-prod   --destination-environment-name myapp-green

1myapp.zip
2├── .ebextensions/
3│   ├── 01-packages.config
4│   ├── 02-environment.config
5│   └── 03-commands.config
6├── src/
7└── package.json

1# .ebextensions/01-packages.config
2packages:
3  yum:
4    git: []
5    nginx: []
6
7commands:
8  01_create_dir:
9    command: "mkdir -p /var/app/logs"
10    ignoreErrors: false
11
12  02_set_permissions:
13    command: "chmod 755 /var/app/logs"
14
15container_commands:
16  # Runs AFTER app source is extracted but BEFORE app starts
17  # Has access to app source in /var/app/staging/
18  01_migrate_db:
19    command: "npm run migrate"
20    leader_only: true   # only runs on one instance (leader election)
21    env:
22      NODE_ENV: production

1# .ebextensions/02-environment.config
2option_settings:
3  aws:elasticbeanstalk:application:environment:
4    NODE_ENV: production
5    LOG_LEVEL: info
6
7  aws:autoscaling:asg:
8    MinSize: 2
9    MaxSize: 10
10
11  aws:elasticbeanstalk:environment:proxy:
12    ProxyServer: nginx
13
14  aws:elb:loadbalancer:
15    CrossZone: true

1# .ebextensions/03-files.config
2files:
3  "/etc/nginx/conf.d/proxy.conf":
4    mode: "000644"
5    owner: root
6    group: root
7    content: |
8      client_max_body_size 20M;
9      proxy_read_timeout 300;
10
11  "/opt/elasticbeanstalk/hooks/appdeploy/post/99_restart.sh":
12    mode: "000755"
13    owner: root
14    group: root
15    content: |
16      #!/bin/bash
17      echo "Post-deploy hook: $(date)" >> /var/log/deploy.log

1.platform/
2├── hooks/
3│   ├── prebuild/           # before build phase
4│   ├── build/              # during build
5│   ├── predeploy/          # after build, before new app starts
6│   └── postdeploy/         # after new app is running
7├── nginx/
8│   └── conf.d/
9│       └── custom.conf     # extra nginx config
10└── confighooks/
11    └── predeploy/          # runs on config-only changes

1# .platform/hooks/predeploy/01_set_env.sh
2#!/bin/bash
3set -e
4export SECRET=$(aws ssm get-parameter --name /myapp/prod/secret --with-decryption --query Parameter.Value --output text)
5echo "SECRET=$SECRET" >> /etc/environment

1# View all configuration options for an environment
2aws elasticbeanstalk describe-configuration-options   --environment-name myapp-prod
3
4# Update a setting without redeploying code
5aws elasticbeanstalk update-environment   --environment-name myapp-prod   --option-settings     Namespace=aws:autoscaling:asg,OptionName=MaxSize,Value=20
6
7# Saved configurations — snapshot an environment's settings
8aws elasticbeanstalk create-configuration-template   --application-name myapp   --template-name prod-baseline   --environment-id e-abc123
9
10# Apply saved configuration to new environment
11aws elasticbeanstalk create-environment   --application-name myapp   --environment-name myapp-prod-v2   --template-name prod-baseline

1{
2  "AWSEBDockerrunVersion": "1",
3  "Image": {
4    "Name": "123456789012.dkr.ecr.us-east-1.amazonaws.com/myapp:latest",
5    "Update": "true"
6  },
7  "Ports": [{ "ContainerPort": 8080, "HostPort": 80 }],
8  "Volumes": [{ "HostDirectory": "/var/app/logs", "ContainerDirectory": "/app/logs" }]
9}

1{
2  "AWSEBDockerrunVersion": 2,
3  "containerDefinitions": [
4    {
5      "name": "app",
6      "image": "123456789012.dkr.ecr.us-east-1.amazonaws.com/myapp:latest",
7      "memory": 512,
8      "portMappings": [{ "hostPort": 80, "containerPort": 8080 }],
9      "essential": true,
10      "links": ["redis"]
11    },
12    {
13      "name": "redis",
14      "image": "redis:7-alpine",
15      "memory": 128,
16      "essential": false
17    }
18  ]
19}

1# Initialize a project
2eb init myapp --region us-east-1 --platform "Node.js 20"
3
4# Create environments
5eb create myapp-prod --elb-type application --scale 2
6eb create myapp-staging
7
8# Deploy current code
9eb deploy myapp-prod
10
11# Deploy specific version
12eb deploy myapp-prod --version v1.2.3
13
14# Open environment URL in browser
15eb open
16
17# SSH into an instance
18eb ssh myapp-prod
19
20# View recent logs
21eb logs --all
22
23# Check environment health
24eb health myapp-prod --refresh
25
26# Terminate environment (keeps application + versions)
27eb terminate myapp-prod

1# .ebextensions/managed-updates.config
2option_settings:
3  aws:elasticbeanstalk:managedactions:
4    ManagedActionsEnabled: true
5    PreferredStartTime: "Sun:03:00"   # UTC
6
7  aws:elasticbeanstalk:managedactions:platformupdate:
8    UpdateLevel: minor                # patch | minor
9    InstanceRefreshEnabled: true