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如何無痛上雲端? 以Elastic Beanstalk Java Container為例
Elastic Beanstalk is an AWS PaaS service that allows developers to easily deploy and manage applications in the AWS cloud. It provides automatic scaling and high availability. However, some applications may not be cloud-ready due to issues with HTTP sessions, file storage, or caching. Solutions include using shared session stores, S3 file storage with S3FS, and caching in databases or cache clusters instead of local file systems. Overall, Elastic Beanstalk is a good option for easily deploying to the cloud while retaining IaaS control, but the architecture of some applications may need adjustments first.
如何無痛上雲端? 以Elastic Beanstalk Java Container為例
- 1. 如何無痛上雲端? 以Elastic Beanstalk JavaContainer為例 ! Study Hsueh <ph.study@gmail.com> 2013-11-07 !1
- 2. 上雲端 Deploy application toVPS (Virtual Private Server) or Cloud Web Application !2
- 3. Cloud Web Application WebApplication is powered by cloud computing Elasticity: 能隨時主動增加或刪減資源 Scalability: 資源的增減直接反應到負載上 Reliability: 應⽤用程式不會因為部分故障, 就無 法提供服務 !3
- 4. Cloud Web Application Architecturefor Web Application Hosting !4 http://media.amazonwebservices.com/architecturecenter/AWS_ac_ra_web_01.pdf
- 5. Cloud Web Application Builda cloud web application in AWS, you may need to know… } Elastic Load Balancing (ELB) Auto Scaling Cloud Watch Elastic Compute Cloud (EC2) Deployment Management Monitoring !5 Infrastructure
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- 7. 有! ⽤用PaaS吧! PaaS: Platform asa Service !7
- 8. 可是聽說PaaS.... White List Black Box PlatformDependent Services/Libraries Software Versions …etc !8
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- 10. Elastic Beanstalk (EB) ElasticBeanstalk是架構在AWS infrastructure 上的PaaS服務, 使⽤用Elastic Beanstalk可以同 時具備控制底層IaaS的能⼒力與PaaS的便利 Elastic Beanstalk的縮寫是EB (不是EBS, EBS是Elastic Block Store的縮寫) !10
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- 15. Java Container OS: x32/x64Amazon Linux (2012.09) Java: OpenJdk 1.6.0_24 Web Container: T omcat 6.0.35 & 7.0.27 !15
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- 18. Customizing Environment Elastic Beanstalkprovides two mechanisms to customize environment Custom AMI Configuration File (Oct 2. 2012) including AWS resources (e.g. ElastiCache) !18
- 19. Configuration File(1) Configuration Filein WAR file !19
- 20. Configuration File(2) Configuration FileExample YAML format !20
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- 22. AWS Management Console UploadWAR file !22
- 23. AWS T oolkit forEclipse !23
- 24. Command-line interface $ gitinit # init git repository $ eb init # init EB Application Configuration $ eb start # start EB Environment $ git add . # track all files $ git commit -m “Initial Commit” # commit $ git aws.push # push to EB !24
- 25. Deploying with ZeroDowntime Swap Environments URLs (CNAMEs) It usually takes 2-3 minutes to swap !25
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- 29. Health Check EC2 Instance TCP:80for nonlegacy containers HTTP:80 for legacy containers Application health check URL HTTP 200 OK= Health !29
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- 31. Processes Use Monit tomonitor processes Apache HTTP Server Apache T omcat !31
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- 33. Pricing Elastic Beanstalk isfree, you only pay for the underlying AWS resources Single-instance T ype EC2 instance Load-balancing, Autoscaling T ype EC2 instance(s) Elastic Load Balancing !33
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- 35. 如果程式有⽤用到下列其中⼀一個... HTTP Session File System UserData Storage File Cache !35
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- 39. HTTP Session Problem(2) Server#1 Server#2 Session Session table table ABAB CDCD LoadBalancer Invalid Session uses Round Robin for Server#2 redirect User#1 User#2 JSESSIONID: CDCD JSESSIONID: ABAB !39
- 40. Solutions for HTTPSession 改程式的做法 Keep Stateless (use access token) 不改程式的做法 Session Persistence Sticky Sessions (Not working for Auto Scaling) !40
- 41. Sticky Sessions Problem(1) Server#1 Server#2 Session Session ABAB CDCD table table LoadBalancer Server Session enables Sticky Sessions Server#1 ABAB Server#2 CDCD User#1 User#2 JSESSIONID: CDCD JSESSIONID: ABAB !41
- 42. Sticky Sessions Problem(2) Server#1 Server#2 Session Scalein or Server Failure table ABAB Invalid Session Server Session for Server#1 Server#1 ABAB Server#2 CDCD User#1 User#2 JSESSIONID: CDCD JSESSIONID: ABAB !42
- 43. Session Persistence Shared Session table Server#1 ABAB CDCD User#1 Server#2 User#2 JSESSIONID:CDCD JSESSIONID: ABAB !43
- 44. Session Managers forT omcat PersistentManager (JDBC Based Store) http://tomcat.apache.org/tomcat-7.0-doc/config/manager.html#Nested_Components Memcached Session Manager http://code.google.com/p/memcached-session-manager Redis Session Manager https://github.com/jcoleman/tomcat-redis-session-manager Amazon DynamoDB Session Manager https://github.com/aws/aws-dynamodb-session-tomcat/ !44
- 45. Session Managers forT omcat Q. 為什麼不使⽤用DeltaManager或 BackupManager呢? (in-memory-replication) A. EC2不⽀支援multicast與boardcast (不完全⽀支 援) !45
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- 47. User Data StorageProblem(1) Server#1 Server#2 File#2 File#1 User#1 User#2 Upload File#1 Upload File#2 !47
- 48. Solutions for UserData Storage(1) Use FS for User Data Storage 改程式的做法 透過AWS SDK把檔案的存取改到S3 不改程式的做法 ⽤用S3FS或NFS !48
- 49. 使⽤用S3FS需注意的地⽅方 流量 上傳: 檔案會先上傳⾄至Server, 在由Server寫⼊入S3 下載:檔案需先由S3取出到Server, 在回傳給User 負載 無法降低Server負載 安全性 敏感的資料: 避免直接對外 ⼀一般資料: 直接把網址對外, 可降低負載與下載流量 !49
- 50. Solutions for FileCache Use FS for File Cache 改程式的做法 將file cache改存⾄至DB或Cache Clusters 不改程式的做法 ? !50
- 51. 可以⽤用S3FS做File Cache嗎? S3不適合儲存File Cache Latency Read-After-WriteConsistency Eventually Consistency (US Standard Region) !51
- 52. Summary Elastic Beanstalk isPaaS, but you retain full control over the underlying infrastructure Elastic Beanstalk is Free For Scalability, you should pay attention to HTTP Session File System !52
- 53. Thanks for yourattention:) !53