Docker & JVM: A Perfect Match

A brief introduction to the concepts behind Docker and a handful of tips to get you started on the exciting journey towards a more robust and reliable application deployment. You will learn how to build and deploy Docker images, how to let your containers talk to each other and why the JVM and Docker are a perfect match.

(Slides from my Jfokus 2015 talk)

Transcript

1. Docker & JVM A Perfect Match Matthias Grüter // @mattgruter Jfokus 2015
2. Image Credit: Tim Kirman
3. Image Credit: Tim Kirman
4. Your Toastmaster Matthias Grüter
6. Containers Credit: containersfirst.com.au
7. VM Container
8. Shipping Containers Credit: danielpivnick
9. Build, Ship and Run Any App, Anywhere
10. Let's create some containers!
11. Container Networking
12. Ports to the outside world d o c k e r r u n ­ p 9 0 0 0 : 8 0 8 0 . . . F o r m a t : [ h o s t P o r t ] : [ c o n t a i n e r P o r t ]
13. Container Linking 1. Database container "redis1" d o c k e r r u n ­ ­ n a m e r e d i s 1 r e d i s 2. Application container "myapp" (wants DB backend) d o c k e r r u n ­ ­ l i n k r e d i s 1 : d b m y a p p F o r m a t : ­ ­ l i n k [ c o n t a i n e r N a m e ] : [ a l i a s ]
14. Docker Images Container Blueprints Source: homeinabox.blogspot.se
15. Layered Filesystems
16. Sharing Images
17. Creating Images
18. Example: Jenkins F R O M d e b i a n : j e s s i e # i n s t a l l j a v a R U N a p t ­ g e t u p d a t e & & a p t ­ g e t i n s t a l l ­ y o p e n j d k ­ 7 ­ j r e # i n s t a l l j e n k i n s A D D h t t p : / / m i r r o r s . j e n k i n s ­ c i . o r g / w a r / 1 . 5 9 7 / j e n k i n s . w a r / E N V J E N K I N S _ H O M E / j e n k i n s W O R K D I R / j e n k i n s E X P O S E 8 0 8 0 C M D [ " j a v a " , " ­ j a r " , " / j e n k i n s . w a r " ]
19. Example: Jenkins Build: d o c k e r b u i l d ­ ­ t a g j e n k i n s . Run: d o c k e r r u n ­ p 8 0 8 0 : 8 0 8 0 j e n k i n s
20. Data Volumes Expose: d o c k e r r u n ­ v / d a t a ­ ­ n a m e d b r e d i s Access: d o c k e r r u n ­ ­ v o l u m e s ­ f r o m = d b r s y n c ­ r / d a t a / r e m o t e : / b a c k u p Credit: Tony Cole
21. A Perfect Match
22. Image credit: snorgtees.com
23. Docker and the JVM Encapsulation (app + libs) Memory management Portability Encapsulation (runtime) Isolation & Containment Portability
24. Docker and the JVM Encapsulation Sandboxing Portability
25. Ecosystem Docker API Build system Build/CI servers Build repositories ...
26. Wedding Gift
27. Qubit‐Coins
28. The Grand Scheme
29. Webapp Gradle p l u g i n s { i d ' a p p l i c a t i o n ' } m a i n C l a s s N a m e = ' s e . q u b i t . w e b a p p . M a i n ' g r o u p = ' m a t t g r u t e r ' r e p o s i t o r i e s { j c e n t e r ( ) } d e p e n d e n c i e s { . . . }
30. Webapp Gradle & Docker p l u g i n s { i d ' a p p l i c a t i o n ' i d ' s e . t r a n s m o d e . d o c k e r ' v e r s i o n ' 1 . 3 ' } m a i n C l a s s N a m e = ' s e . q u b i t . w e b a p p . M a i n ' g r o u p = ' m a t t g r u t e r ' r e p o s i t o r i e s { j c e n t e r ( ) } d e p e n d e n c i e s { . . . } d i s t D o c k e r . d o c k e r f i l e { E X P O S E 8 0 8 0 }
31. Build g r a d l e d i s t D o c k e r :‐)
32. Deploy Wallet (Redis) d o c k e r r u n ­ d ­ ­ n a m e d b r e d i s Miner d o c k e r r u n ­ d ­ ­ l i n k d b : d b m a t t g r u t e r / q u b i t ­ m i n e r Webapp d o c k e r r u n ­ ­ l i n k d b : d b ­ p 8 0 8 0 : 8 0 8 0 m a t t g r u t e r / q u b i t ­ w e b a p p
33. Faster! d o c k e r r u n ­ d ­ ­ l i n k d b : d b m a t t g r u t e r / q u b i t ­ m i n e r d o c k e r r u n ­ d ­ ­ l i n k d b : d b m a t t g r u t e r / q u b i t ­ m i n e r d o c k e r r u n ­ d ­ ­ l i n k d b : d b m a t t g r u t e r / q u b i t ­ m i n e r . . .
34. Image credit: Deep Impact
35. Your container is NOT a VM Stop treating it like one!
36. Corollary #1 Say no to s s h d use volumes, volumes, volumes ... and docker exec
37. Corollary #2 There can be only one PID Credit: imaginarywars.wordpress.com
38. Docker is a polyglot tool! So sorry, JVM!
39. Docker Hub Automated Builds
40. Be Specific Images are cheap, therefore ... ... build many small specific images.
41. Size Matters Use small baseimages
42. Corollary (e.g. apt‐get clean, multi‐line run)
43. Use the cache, Luke! Move ADD & COPY to end of Dockerfile (they invalidate the cache)
44. What does the future hold? Credit: www.clipartbest.com/8balllogo
45. Image Credit: Tim Kirman
46. Credit: Solomon Hykes