Engine, the client-server application made up of the Docker daemon, a REST API that speci es interfaces for interacting with the daemon, and a command line interface (CLI) client that talks to the daemon (through the REST API wrapper). Docker Engine accepts docker commands from the CLI, such as d o c k e r r u n < i m a g e > , d o c k e r p s to list running containers, d o c k e r i m a g e s to list images, and so on. Engine is the core of Docker and nothing else will run without it. Ref: docker.com 4 / 31
The user does not directly interact with the daemon, but instead through the Docker client. Docker client The Docker client, in the form of the docker binary, is the primary user interface to Docker. It accepts commands from the user and communicates back and forth with a Docker daemon. Ref: docker.com 6 / 31 Docker Architecture Docker uses a client-server architecture. The Docker client talks to the Docker daemon, which does the heavy lifting of building, running, and distributing your Docker containers. Both the Docker client and the daemon can run on the same system, or you can connect a Docker client to a remote Docker daemon. The Docker client and daemon communicate via sockets or through a RESTful API.
Dockerized hosts (hosts with Docker Engine on them). Typically, you install Docker Machine on your local system. Docker Machine has its own command line client d o c k e r - m a c h i n e and the Docker Engine client, d o c k e r . You can use Machine to install Docker Engine on one or more virtual systems. These virtual systems can be local (as when you use Machine to install and run Docker Engine in VirtualBox on Mac or Windows) or remote (as when you use Machine to provision Dockerized hosts on cloud providers). The Dockerized hosts themselves can be thought of, and are sometimes referred to as, managed "machines". Using d o c k e r - m a c h i n e commands, you can start, inspect, stop, and restart a managed host, upgrade the Docker client and daemon, and con gure a Docker client to talk to your host. Point the Machine CLI at a running, managed host, and you can run docker commands directly on that host. For example, run d o c k e r - m a c h i n e e n v d e f a u l t to point to a host called d e f a u l t , follow on-screen instructions to complete env setup, and run d o c k e r p s , d o c k e r r u n h e l l o - w o r l d , and so forth. 9 / 31 Docker Machine vs. Docker Engine Ref: Machine Overview
p s : / / g i t h u b . c o m / d o c k e r / m a c h i n e / r e l e a s e s / d o w n l o a d / v 0 . 6 . 0 / d o c k e r - m a c h i n e - ` u n a m e $ c h m o d + x / u s r / l o c a l / b i n / d o c k e r - m a c h i n e $ d o c k e r - m a c h i n e v e r s i o n d o c k e r - m a c h i n e v e r s i o n 0 . 7 . 0 , b u i l d a 6 5 0 a 4 0 $ d o c k e r - m a c h i n e l s N A M E A C T I V E D R I V E R S T A T E U R L S W A R M D O C K E R E R R O R S Install 12 / 31
- m a c h i n e c r e a t e - - d r i v e r v i r t u a l b o x d e f a u l t C r e a t i n g C A : / h o m e / e m / . d o c k e r / m a c h i n e / c e r t s / c a . p e m C r e a t i n g c l i e n t c e r t i f i c a t e : / h o m e / e m / . d o c k e r / m a c h i n e / c e r t s / c e r t . p e m R u n n i n g p r e - c r e a t e c h e c k s . . . ( d e f a u l t ) I m a g e c a c h e d i r e c t o r y d o e s n o t e x i s t , c r e a t i n g i t a t / h o m e / e m / . d o c k e r / m a c h i n e / ( d e f a u l t ) N o d e f a u l t B o o t 2 D o c k e r I S O f o u n d l o c a l l y , d o w n l o a d i n g t h e l a t e s t r e l e a s e . . . ( d e f a u l t ) L a t e s t r e l e a s e f o r g i t h u b . c o m / b o o t 2 d o c k e r / b o o t 2 d o c k e r i s v 1 . 1 1 . 1 ( d e f a u l t ) D o w n l o a d i n g / h o m e / e m / . d o c k e r / m a c h i n e / c a c h e / b o o t 2 d o c k e r . i s o f r o m h t t p s : / / g i t h u b ( d e f a u l t ) 0 % . . . . 1 0 % . . . . 2 0 % . . . . 3 0 % . . . . 4 0 % . . . . 5 0 % . . . . 6 0 % . . . . 7 0 % . . . . 8 0 % . . . . 9 0 % . . . . 1 0 0 % C r e a t i n g m a c h i n e . . . ( d e f a u l t ) C o p y i n g / h o m e / e m / . d o c k e r / m a c h i n e / c a c h e / b o o t 2 d o c k e r . i s o t o / h o m e / e m / . d o c k e r / m a c ( d e f a u l t ) C r e a t i n g V i r t u a l B o x V M . . . ( d e f a u l t ) C r e a t i n g S S H k e y . . . ( d e f a u l t ) S t a r t i n g t h e ( d e f a u l t ) C h e c k n e t w o r k t o r e - c r e a t e i f n e e d e d . . . ( d e f a u l t ) F o u n d a n e w h o s t - o n l y a d a p t e r : " v b o x n e t 1 " ( d e f a u l t ) W a i t i n g f o r a n I P . . . W a i t i n g f o r m a c h i n e t o b e r u n n i n g , t h i s m a y t a k e a f e w m i n u t e s . . . D e t e c t i n g o p e r a t i n g s y s t e m o f c r e a t e d i n s t a n c e . . . W a i t i n g f o r S S H t o b e a v a i l a b l e . . . D e t e c t i n g t h e p r o v i s i o n e r . . . P r o v i s i o n i n g w i t h b o o t 2 d o c k e r . . . C o p y i n g c e r t s t o t h e l o c a l m a c h i n e d i r e c t o r y . . . C o p y i n g c e r t s t o t h e r e m o t e m a c h i n e . . . S e t t i n g D o c k e r c o n f i g u r a t i o n o n t h e r e m o t e d a e m o n . . . C h e c k i n g c o n n e c t i o n t o D o c k e r . . . D o c k e r i s u p a n d r u n n i n g ! T o s e e h o w t o c o n n e c t y o u r D o c k e r C l i e n t t o t h e D o c k e r E n g i n e r u n n i n g o n t h i s v i r t u a l m a $ d o c k e r - m a c h i n e l s N A M E A C T I V E D R I V E R S T A T E U R L S W A R M D O C K E R d e f a u l t - v i r t u a l b o x R u n n i n g t c p : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 0 : 2 3 7 6 v 1 . 1 1 . 1 13 / 31
a c h i n e e n v d e f a u l t e x p o r t D O C K E R _ T L S _ V E R I F Y = " 1 " e x p o r t D O C K E R _ H O S T = " t c p : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 0 : 2 3 7 6 " e x p o r t D O C K E R _ C E R T _ P A T H = " / h o m e / e m / . d o c k e r / m a c h i n e / m a c h i n e s / d e f a u l t " e x p o r t D O C K E R _ M A C H I N E _ N A M E = " d e f a u l t " # R u n t h i s c o m m a n d t o c o n f i g u r e y o u r s h e l l : # e v a l $ ( d o c k e r - m a c h i n e e n v d e f a u l t ) $ e v a l $ ( d o c k e r - m a c h i n e e n v d e f a u l t ) $ d o c k e r i m a g e s R E P O S I T O R Y T A G I M A G E I D C R E A T E D S I Z E $ e n v | g r e p D O C K E R D O C K E R _ H O S T = t c p : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 0 : 2 3 7 6 D O C K E R _ M A C H I N E _ N A M E = d e f a u l t D O C K E R _ T L S _ V E R I F Y = 1 D O C K E R _ C E R T _ P A T H = / h o m e / e m / . d o c k e r / m a c h i n e / m a c h i n e s / d e f a u l t $ d o c k e r - m a c h i n e l s N A M E A C T I V E D R I V E R S T A T E U R L S W A R M D O C K E R d e f a u l t * v i r t u a l b o x R u n n i n g t c p : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 0 : 2 3 7 6 v 1 . 1 1 . 1 14 / 31
n b u s y b o x e c h o h e l l o w o r l d U n a b l e t o f i n d i m a g e ' b u s y b o x : l a t e s t ' l o c a l l y l a t e s t : P u l l i n g f r o m l i b r a r y / b u s y b o x . . . 3 8 5 e 2 8 1 3 0 0 c c : P u l l c o m p l e t e . . . a 3 e d 9 5 c a e b 0 2 : P D i g e s t : s h a 2 5 6 : 4 a 8 8 7 a 2 3 2 6 e c 9 e 0 f a 9 0 c c e 7 b 4 7 6 4 b 0 e 6 2 7 b 5 d 6 a f c b 8 1 a 3 f 7 3 c 8 5 d c 2 9 c e a 0 0 0 4 8 S t a t u s : D o w n l o a d e d n e w e r i m a g e f o r b u s y b o x : l a t e s t h e l l o w o r l d $ d o c k e r i m a g e s R E P O S I T O R Y T A G I M A G E I D C R E A T E D S I Z E b u s y b o x l a t e s t 4 7 b c c 5 3 f 7 4 d c 6 w e e k s a g o 1 . 1 1 3 $ d o c k e r - m a c h i n e i p d e f a u l t 1 9 2 . 1 6 8 . 9 9 . 1 0 0 $ d o c k e r p s - a C O N T A I N E R I D I M A G E C O M M A N D C R E A T E D S T A T U S 0 f b 8 a f c a 0 5 e a b u s y b o x " e c h o h e l l o w o r l d " 2 m i n u t e s a g o E x i t e d $ d o c k e r r u n - d - p 8 0 0 0 : 8 0 n g i n x U n a b l e t o f i n d i m a g e ' n g i n x : l a t e s t ' l o c a l l y l a t e s t : P u l l i n g f r o m l i b r a r y / n g i n x e f d 2 6 e c c 9 5 4 8 : P u l l c o m p l e t e . . . 8 d d c 2 d 7 b e b 9 1 : P u l l c o m p l e t e D i g e s t : s h a 2 5 6 : 2 c a 2 6 3 8 e 5 5 3 1 9 b 7 b c 0 c 7 d 0 2 8 2 0 9 e a 6 9 b 1 3 6 8 e 9 5 b 0 1 3 8 3 e 6 6 d f e 7 e 4 f 4 3 7 8 0 9 2 6 d S t a t u s : D o w n l o a d e d n e w e r i m a g e f o r n g i n x : l a t e s t a 8 e b 8 f 2 5 7 c c 1 a 7 4 7 f f 5 b d 3 0 c 0 5 6 f c f 5 f e 1 7 3 d e 8 f b 0 7 8 1 2 6 5 e e d 5 9 5 a b 7 c d 6 9 b 4 0 $ d o c k e r p s C O N T A I N E R I D I M A G E C O M M A N D C R E A T E D S T A a 8 e b 8 f 2 5 7 c c 1 n g i n x " n g i n x - g ' d a e m o n o f f " 1 0 s e c o n d s a g o U p 15 / 31
( d o c k e r - m a c h i n e i p d e f a u l t ) : 8 0 0 0 $ d o c k e r - m a c h i n e s t o p S t o p p i n g " d e f a u l t " . . . M a c h i n e " d e f a u l t " w a s s t o p p e d . # w i t h o u t e x p l i c i t n a m e - > d e f a u l t $ e n v | g r e p D O C K E R D O C K E R _ H O S T = t c p : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 0 : 2 3 7 6 D O C K E R _ M A C H I N E _ N A M E = d e f a u l t D O C K E R _ T L S _ V E R I F Y = 1 D O C K E R _ C E R T _ P A T H = / h o m e / e m / . d o c k e r / m a c h i n e / m a c h i n e s / d e f a u l t $ d o c k e r i m a g e s A n e r r o r o c c u r r e d t r y i n g t o c o n n e c t : G e t h t t p s : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 0 : 2 3 7 6 / v 1 . 2 3 / i m a g e s / j s o n : $ e v a l $ ( d o c k e r - m a c h i n e e n v - u ) $ e n v | g r e p D O C K E R $ d o c k e r i m a g e s R E P O S I T O R Y T A G I M A G E I D C R E A T E D c o m p o s e t e s t _ w e b l a t e s t e 7 d 6 2 b a 3 0 c 2 0 4 d a y s a g o w e b l a t e s t d 6 f 2 5 a 9 b f 6 3 2 4 d a y s a g o r e d i s l a t e s t 9 a 4 5 0 a e 4 1 8 d 8 4 d a y s a g o 17 / 31
pool of Docker hosts into a single, virtual Docker host. Because Docker Swarm serves the standard Docker API, any tool that already communicates with a Docker daemon can use Swarm to transparently scale to multiple hosts. 19 / 31 Docker Swarm Ref: Mike Goelzer, Swarm: Docker Native Clustering, Swarm Overview
c h i n e c r e a t e - d v i r t u a l b o x m a n a g e r $ d o c k e r - m a c h i n e c r e a t e - d v i r t u a l b o x a g e n t 1 $ d o c k e r - m a c h i n e c r e a t e - d v i r t u a l b o x a g e n t 2 $ d o c k e r - m a c h i n e l s N A M E A C T I V E D R I V E R S T A T E U R L S W A R M D O C K E R a g e n t 1 - v i r t u a l b o x R u n n i n g t c p : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 1 : 2 3 7 6 v 1 . 1 1 . 1 a g e n t 2 - v i r t u a l b o x R u n n i n g t c p : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 2 : 2 3 7 6 v 1 . 1 1 . 1 d e f a u l t - v i r t u a l b o x S t o p p e d U n k n o w n m a n a g e r - v i r t u a l b o x R u n n i n g t c p : / / 1 9 2 . 1 6 8 . 9 9 . 1 0 0 : 2 3 7 6 v 1 . 1 1 . 1 23 / 31 Create Nodes
k e r - m a c h i n e e n v m a n a g e r ) $ d o c k e r r u n - - r m s w a r m c r e a t e U n a b l e t o f i n d i m a g e ' s w a r m : l a t e s t ' l o c a l l y l a t e s t : P u l l i n g f r o m l i b r a r y / s w a r m d d 2 c a 0 2 f e e e f : P u l l c o m p l e t e . . . a 3 e d 9 5 c a e b 0 2 : P u l l c o m p l e t e D i g e s t : s h a 2 5 6 : 6 9 3 6 3 2 7 2 4 4 3 f 4 0 8 0 e 0 6 2 3 e 7 8 c e d 4 1 b f 3 8 2 7 3 5 3 5 e e 7 f 4 2 2 b 2 6 b b c 5 5 5 d b 2 b 5 d 4 a 4 S t a t u s : D o w n l o a d e d n e w e r i m a g e f o r s w a r m : l a t e s t 3 2 3 5 1 7 c d 6 2 f 3 b 9 6 9 7 1 5 2 e 0 9 b d c f e 8 7 1 4 $ d o c k e r p s C O N T A I N E R I D I M A G E C O M M A N D C R E A T E D S T A T U S $ d o c k e r i m a g e s R E P O S I T O R Y T A G I M A G E I D C R E A T E D S I Z E s w a r m l a t e s t 4 7 d c 1 8 2 e a 7 4 b 3 2 h o u r s a g o 1 9 . 3 2 $ d o c k e r r u n - d - p 3 3 7 6 : 3 3 7 6 - t - v / v a r / l i b / b o o t 2 d o c k e r : / c e r t s : r o s w a r m m a n a g e - H 0 . 0 . 2 0 8 2 4 6 4 9 f d 0 3 3 5 1 d a 2 f 8 b 7 7 2 7 0 3 3 2 c 2 d 9 4 9 8 3 6 6 4 a 7 a 2 7 3 3 a 7 7 6 d 4 8 b 6 4 b 4 0 9 6 5 5 24 / 31 Run Swarm Manager
on Docker Hub to create a unique discovery token for the cluster. This discovery backend is only for low-volume development and testing purposes. The discovery backend maintains an up-to- date list of cluster members and shares that list with the Swarm manager. The Swarm manager uses this list to assign tasks to the nodes. 25 / 31 Swarm Discovery Token
k e r - m a c h i n e e n v a g e n t 1 ) $ d o c k e r r u n - d s w a r m j o i n - - a d d r = $ ( d o c k e r - m a c h i n e i p a g e n t 1 ) : 2 3 7 6 t o k e n : / / 3 2 3 5 1 7 c d 6 2 f 3 b U n a b l e t o f i n d i m a g e ' s w a r m : l a t e s t ' l o c a l l y l a t e s t : P u l l i n g f r o m l i b r a r y / s w a r m d d 2 c a 0 2 f e e e f : P u l l c o m p l e t e . . . a 3 e d 9 5 c a e b 0 2 : P u l l c o m p l e t e D i g e s t : s h a 2 5 6 : 6 9 3 6 3 2 7 2 4 4 3 f 4 0 8 0 e 0 6 2 3 e 7 8 c e d 4 1 b f 3 8 2 7 3 5 3 5 e e 7 f 4 2 2 b 2 6 b b c 5 5 5 d b 2 b 5 d 4 a 4 S t a t u s : D o w n l o a d e d n e w e r i m a g e f o r s w a r m : l a t e s t 2 f 9 2 9 c d f f 3 e 9 a e 6 d e 4 7 b 0 3 6 7 1 4 0 b d c 3 e 0 f 2 d 2 3 d 8 e f 8 0 9 d 4 b b 5 f 8 9 0 0 f f b a 8 2 e 6 3 $ e v a l $ ( d o c k e r - m a c h i n e e n v a g e n t 2 ) $ d o c k e r r u n - d s w a r m j o i n - - a d d r = $ ( d o c k e r - m a c h i n e i p a g e n t 2 ) : 2 3 7 6 t o k e n : / / 3 2 3 5 1 7 c d 6 2 f 3 b . . . $ e v a l $ ( d o c k e r - m a c h i n e e n v - u ) 26 / 31 Run Swarm Agents
k e r - m a c h i n e e n v m a n a g e r ) $ e x p o r t D O C K E R _ H O S T = $ ( d o c k e r - m a c h i n e i p m a n a g e r ) : 3 3 7 6 $ d o c k e r i n f o C o n t a i n e r s : 2 R u n n i n g : 2 P a u s e d : 0 S t o p p e d : 0 I m a g e s : 2 S e r v e r V e r s i o n : s w a r m / 1 . 2 . 1 R o l e : p r i m a r y S t r a t e g y : s p r e a d F i l t e r s : h e a l t h , p o r t , c o n t a i n e r s l o t s , d e p e n d e n c y , a f f i n i t y , c o n s t r a i n t N o d e s : 2 a g e n t 1 : 1 9 2 . 1 6 8 . 9 9 . 1 0 1 : 2 3 7 6 - C o n t a i n e r s : 1 - R e s e r v e d C P U s : 0 / 1 - R e s e r v e d M e m o r y : 0 B / 1 . 0 2 1 G i B a g e n t 2 : 1 9 2 . 1 6 8 . 9 9 . 1 0 2 : 2 3 7 6 - C o n t a i n e r s : 1 - R e s e r v e d C P U s : 0 / 1 - R e s e r v e d M e m o r y : 0 B / 1 . 0 2 1 G i B . . . K e r n e l V e r s i o n : 4 . 4 . 8 - b o o t 2 d o c k e r O p e r a t i n g S y s t e m : l i n u x A r c h i t e c t u r e : a m d 6 4 C P U s : 2 T o t a l M e m o r y : 2 . 0 4 2 G i B . . . W A R N I N G : N o k e r n e l m e m o r y l i m i t s u p p o r t 27 / 31 Connect to Swarm
h e l l o - w o r l d H e l l o f r o m D o c k e r . . . . $ d o c k e r p s - a C O N T A I N E R I D I M A G E C O M M A N D C R E A T E D S T A 8 1 e a 3 6 6 b 4 6 e 5 h e l l o - w o r l d " / h e l l o " 1 8 s e c o n d s a g o E x i a b b f b c c 8 d e 6 2 s w a r m " / s w a r m j o i n - - a d d r = 1 " 2 0 m i n u t e s a g o U p 2 f 9 2 9 c d f f 3 e 9 s w a r m " / s w a r m j o i n - - a d d r = 1 " 2 2 m i n u t e s a g o U p 28 / 31 Use Swarm
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