Docker - next big thing

Docker - next big thing Jesse Wolgamott
Docker - next big thing
By @jwo for HoustonRB
0

View Slide

View Slide

Docker
Run in linux, just like production
It's like heroku, for development

View Slide

Laws of Docker
1 Process per Container
"Containers" are servers

View Slide

Standard Rails App
Rails
PostgreSQL
Redis
Memcached
Sidekiq

View Slide

Startup - Development
Clone
bundle
rake db:setup
brew install postgresql
createdb
brew install redis
brew install memcached
foreman start

View Slide

Startup - Production
install ruby from source. maybe rbenv?
sudo apt-get install postgresql, redis, memcached
bundle
create database and user
rake db:migrate
configure nginx and unicorn

View Slide

ETOOMANYDIFFS
New users, many dependencies, such frustration

View Slide

Startup, Dev and Live
1. g
i
t c
l
o
n
e
2. d
o
c
k
e
r
-
c
o
m
p
o
s
e b
u
i
l
d
3. d
o
c
k
e
r
-
c
o
m
p
o
s
e u
p

View Slide

Comparison vs Chef
No need for chef or ansible for most cases
Deploy and you're good

View Slide

Docker Compose
Was "fig" (older documentation)
Fancy term: "Coordination"
Real World: connects your DB to your Rails

View Slide

docker-compose.yml
m
y
s
q
l
d
a
t
a
:
i
m
a
g
e
: c
o
g
n
i
t
e
e
v
/
e
c
h
o
v
o
l
u
m
e
s
:
- /
v
a
r
/
l
i
b
/
m
y
s
q
l
d
b
:
b
u
i
l
d
: m
y
s
q
l
:
l
a
t
e
s
t
e
x
p
o
s
e
:
- "
3
3
0
6
"
v
o
l
u
m
e
s
_
f
r
o
m
:
- m
y
s
q
l
d
a
t
a
a
p
p
:
b
u
i
l
d
: .
c
o
m
m
a
n
d
: b
u
n
d
l
e e
x
e
c r
a
i
l
s s -
p 3
0
0
0 -
b '
0
.
0
.
0
.
0
'
v
o
l
u
m
e
s
:
- .
:
/
m
y
a
p
p
p
o
r
t
s
:
- "
3
0
0
0
:
3
0
0
0
"
l
i
n
k
s
:
- d
b

View Slide

Boot2docker
Have to have it so your Macs can run Linux in your Linux

View Slide

HOWTO Persist Data
(Like Postgres, etc Data)
Have your db data directory connect to a "data container"
m
y
s
q
l
d
a
t
a
:
i
m
a
g
e
: c
o
g
n
i
t
e
e
v
/
e
c
h
o
v
o
l
u
m
e
s
:
- /
v
a
r
/
l
i
b
/
m
y
s
q
l
d
b
:
b
u
i
l
d
: m
y
s
q
l
:
l
a
t
e
s
t
e
x
p
o
s
e
:
- "
3
3
0
6
"
v
o
l
u
m
e
s
_
f
r
o
m
:
- m
y
s
q
l
d
a
t
a

View Slide

HOWTO Deploy your
docker
SSH into your main box
g
i
t c
l
o
n
e
d
o
c
k
e
r
-
c
o
m
p
o
s
e b
u
i
l
d
d
o
c
k
e
r
-
c
o
m
p
o
s
e s
t
o
p &
& d
o
c
k
e
r
-
c
o
m
p
o
s
e s
t
a
r
t

View Slide

HOWTO Get a main box
with docker
1. Digital Ocean $5 plan
2. Choose Docker
3. Win.

View Slide

HOWTO Edit your Rails
locally
Do everything the same except:
instead of
http://192.168.59.103:3000/
http://localhost:3000

View Slide

HOWTO run migrations
d
o
c
k
e
r
-
c
o
m
p
o
s
e r
u
n a
p
p r
a
k
e d
b
:
m
i
g
r
a
t
e

View Slide

HOWTO Environment files
Add in a .env file like you normally would. Gitignore it.
m
y
s
q
l
:
e
n
v
_
f
i
l
e
: D
o
c
k
e
r
C
o
n
f
i
g
/
.
e
n
v
v
o
l
u
m
e
s
_
f
r
o
m
:
- m
y
s
q
l
d
a
t
a
c
o
n
t
a
i
n
e
r

View Slide

HOWTO database.yml
p
r
o
d
u
c
t
i
o
n
:
a
d
a
p
t
e
r
: m
y
s
q
l
2
d
a
t
a
b
a
s
e
: y
o
l
o
_
p
r
o
d
u
c
t
i
o
n
u
s
e
r
n
a
m
e
: <
%
= E
N
V
[
'
M
Y
S
Q
L
_
U
S
E
R
'
]
%
>
p
a
s
s
w
o
r
d
: <
%
= E
N
V
[
'
M
Y
S
Q
L
_
P
A
S
S
'
]
%
>
h
o
s
t
: m
y
s
q
l
p
o
r
t
: 3
3
0
6

View Slide

HOWTO SSH into your boxes
1. Don't
2. Instead, run a process like you would heroku
d
o
c
k
e
r
-
c
o
m
p
o
s
e r
u
n a
p
p /
b
i
n
/
b
a
s
h

View Slide

HOWTO Monitor your boxes
Prometheus, by SoundCloud folk, rules.
p
r
o
m
e
t
h
e
u
s
:
b
u
i
l
d
: d
o
c
k
e
r
_
c
o
n
f
i
g
/
p
r
o
m
e
t
h
e
u
s
p
o
r
t
s
:
- "
9
0
9
0
:
9
0
9
0
"
l
i
n
k
s
:
- c
o
n
t
a
i
n
e
r
e
x
p
o
r
t
e
r
c
o
n
t
a
i
n
e
r
e
x
p
o
r
t
e
r
:
i
m
a
g
e
: p
r
o
m
/
c
o
n
t
a
i
n
e
r
-
e
x
p
o
r
t
e
r
p
o
r
t
s
:
- "
9
1
0
4
:
9
1
0
4
"
v
o
l
u
m
e
s
:
- /
s
y
s
/
f
s
/
c
g
r
o
u
p
:
/
c
g
r
o
u
p
- /
v
a
r
/
r
u
n
/
d
o
c
k
e
r
.
s
o
c
k
:
/
v
a
r
/
r
u
n
/
d
o
c
k
e
r
.
s
o
c
k

View Slide

DockerFile
F
R
O
M p
h
u
s
i
o
n
/
p
a
s
s
e
n
g
e
r
-
r
u
b
y
2
2
R
U
N a
p
t
-
g
e
t u
p
d
a
t
e -
q
q &
& a
p
t
-
g
e
t i
n
s
t
a
l
l -
y b
u
i
l
d
-
e
s
s
e
n
t
i
a
l
R
U
N m
k
d
i
r /
m
y
a
p
p
W
O
R
K
D
I
R /
m
y
a
p
p
A
D
D . /
m
y
a
p
p
R
U
N b
u
n
d
l
e i
n
s
t
a
l
l

View Slide

Services
Docker intentionally breaks upstart and most things that start
systems
The Dockerfile, instead, has a "CMD" (one cmd) that runs when
started
This is basically the docker way

View Slide

HOWTO Run more than one service
(assuming you want to say, run Inspeqtor to notify you of
crashes)
Install runit (pronounced 'run-it')
CMD is "/usr/sbin/runsvdir-start"
# A
d
d r
u
n
i
t s
t
a
r
t
u
p
s
R
U
N m
k
d
i
r /
e
t
c
/
s
v
/
i
n
s
p
e
q
t
o
r
A
D
D i
n
s
p
e
q
t
o
r
.
r
u
n
i
t /
e
t
c
/
s
v
/
i
n
s
p
e
q
t
o
r
/
r
u
n
R
U
N m
k
d
i
r /
e
t
c
/
s
v
/
m
y
s
q
l
A
D
D m
y
s
q
l
.
r
u
n
i
t /
e
t
c
/
s
v
/
m
y
s
q
l
/
r
u
n
R
U
N c
h
m
o
d +
x /
e
t
c
/
s
v
/
i
n
s
p
e
q
t
o
r
/
r
u
n
R
U
N c
h
m
o
d +
x /
e
t
c
/
s
v
/
m
y
s
q
l
/
r
u
n
# L
i
n
k r
u
n
i
t s
t
a
r
t
u
p s
c
r
i
p
t
s
R
U
N l
n -
s /
e
t
c
/
s
v
/
m
y
s
q
l
/ /
e
t
c
/
s
e
r
v
i
c
e
/
m
y
s
q
l
R
U
N l
n -
s /
e
t
c
/
s
v
/
i
n
s
p
e
q
t
o
r
/ /
e
t
c
/
s
e
r
v
i
c
e
/
i
n
s
p
e
q
t
o
r
# r
e
m
o
v
e t
h
e u
p
s
t
a
r
t c
o
n
f
i
g d
i
r
e
c
t
o
r
y
R
U
N r
m -
r
f /
e
t
c
/
i
n
i
t

View Slide

View Slide

Yeah
So that part is rough around the edges
Docker REALLY wants you to do 1 process per container
It strips all else away besides what you start
But runit can work

View Slide

Finding Images
Images are on https://registry.hub.docker.com/

View Slide

HOWTO Reverse Engineer
Dockerfiles
1. Check out the Image Dockerfile
2. Copy and Paste
3. Make sure you're on same linux OS.
Ubuntu. CoreOS. Debian. (likely more).

View Slide

JWO Rule of Docker Images
What if I told you that using other people's
(even official) docker images lead to more
problems than they solve?
— Jesse Wolgamott (@jwo) April 27, 2015

View Slide

HOWTO Scale number of app servers
1. d
o
c
k
e
r
-
c
o
m
p
o
s
e s
c
a
l
e a
p
p
=
2
2. Use NGINX as reverse proxy
3. Have ngnix server port 80, server to many upstream
u
p
s
t
r
e
a
m a
p
p
_
s
e
r
v
e
r
s {
s
e
r
v
e
r 1
2
7
.
0
.
0
.
1
:
8
0
8
0
;
s
e
r
v
e
r 1
2
7
.
0
.
0
.
1
:
8
0
8
1
;
}
Possible way to automate:
http://jasonwilder.com/blog/2014/03/25/automated-nginx-
reverse-proxy-for-docker/

View Slide

HOWTO Have a larger disk size on
boot2docker
b
o
o
t
2
d
o
c
k
e
r d
e
s
t
r
o
y
b
o
o
t
2
d
o
c
k
e
r i
n
i
t -
-
d
i
s
k
s
i
z
e
=
2
0
0
0
0
(Yeah, that deletes all stuff and you start over)

View Slide

HOWTO See what's running, and
stop them
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
5
5
5
b
3
b
4
e
3
1
f
a f
i
v
e
h
u
n
d
r
e
d
_
a
p
p
:
l
a
t
e
s
t "
b
u
n
d
l
e e
x
e
c r
a
i
l
s s 2 m
i
n
6
a
5
b
b
7
6
6
f
7
4
5 p
o
s
t
g
r
e
s
:
l
a
t
e
s
t "
/
d
o
c
k
e
r
-
e
n
t
r
y
p
o
i
n
t
.
d
o
c
k
e
r k
i
l
l 5
5
5
b
3
b
4
e
3
1
f
a

View Slide

Demo

View Slide

Conclusion
1. Docker is extremely cool
2. Fast, easy'ish (appropriate levels of easy)
Try it out:
GitHub / jwo / blocker

View Slide

Docker - next big thing

Docker - next big thing

Jesse Wolgamott

More Decks by Jesse Wolgamott

Other Decks in Technology

Featured

Transcript