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Docker
Gilson Filho
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Alert!
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Slides with this ↑
show updates about Docker and your
ecosystem
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What is
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Docker Begins
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What is Docker ?
“ Docker is an open platform for
building, shipping and running
distributed applications.
docker.io
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What is Docker ?
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An open framework to assemble specialized container
systems
without reinventing the wheel.
Moby
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Going forward, Docker will be assembled using Moby,
see for more details.
Moby and Docker
Moby
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What is Docker Moby ?
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Back to THE 90's
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MY APP
+
A REAL Server
=
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VIRTUAL
MACHINEs
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VIRTUAL MACHINEs
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VIRTUAL MACHINEs
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Docker
containers
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Docker containers
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Docker containers
VM Docker
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LXC =
OS-level virtualization for
running multiple isolated Linux
systems
"LINUX
CONTAINERS"
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cgroups =
Linux kernel feature that limits and
isolates the resource usage
(CPU, disk I/O, network, etc.)
"CONTROL
GROUPS"
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AUFs =
Filesystem which is based on images
where every modification is a diff
from the previous one (Like commits
in git)
"Adv. multi layered
Unification FS"
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Docker > 1.11
Engine is now built on runC and
containerd
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How to Install
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HOW TO INSTALL ?
http://docs.docker.com/installation
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HOW TO INSTALL ?
http://docs.docker.com/installation
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Linux
Debian
https://docs.docker.com/engine/installation/linux/debian/
Fedora
https://docs.docker.com/engine/installation/linux/fedora/
Ubuntu
https://docs.docker.com/engine/installation/linux/ubuntu/
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Windows e OS X
https://www.docker.com/products/docker-toolbox
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Windows
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OS X
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Docker HUB
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Over 1.2B Pulls
from Docker Hub
5.6M 65
240K
Pulls per Day
Pulls per Second
Repositories on Docker Hub
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Docker Store
next generation of Docker Hub
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Docker Store
next generation of Docker Hub
https://docs.docker.com/docker-store
https://store.docker.com
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Dictionary
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Image
An image is a lightweight, stand-alone, executable package
that includes everything needed to run a piece of software,
including the code, a runtime, libraries, environment
variables, and config files.
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Container
A container is a runtime instance of an image – what the image
becomes in memory when actually executed. It runs completely
isolated from the host environment by default, only accessing
host files and ports if configured to do so.
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Docker
Commands
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Docker Search
~ $ docker search -h
Usage: docker search [OPTIONS] TERM
Search the Docker Hub for images
--automated=false Only show automated builds
--no-trunc=false Don't truncate output
-s, --stars=0 Only displays with at least x stars
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Docker Search
arch hello-world
DESCRIPTION STARS OFFICIAL AU
Hello World! (an example of minimal Docker... 24 [OK]
orld Image to test docker deployments. Has Apac... 12 [O
et-hello-world ASP.NET vNext - Hello World 1 [O
ocker-hello-world 1 [O
i/devops-hello-world-app Example application for deploying using Co... 1 [O
-world 0 [O
o-world Hello World web server in under 2.5 MB 0 [O
llo-world this is 3rd POC 0 [O
lo-world 0 [O
llo-world 0 [O
-hello-world Java Hello World Test Docker Image 0 [O
world 0 [O
ello-world A docker auto build test application 0 [O
lr-hello-world A simple Hello World sample, running as a ... 0 [O
/docker-hello-world 0 [O
-world 0 [O
ocker-java-hello-world This is an automated build of docker java-... 0 [O
r-hello-world Hello world automated build 0 [O
hello-world-node-docker A simple hello world app 0 [O
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Docker pull
$ docker pull -h
age: docker pull [OPTIONS] NAME[:TAG] | [REGISTRY_HOST[:REGISTRY_PORT]/]NAME[:TAG]
ll an image or a repository from the registry
-a, --all-tags=false Download all tagged images in the repository
--disable-content-trust=true Skip image verification
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Docker pull
~ $ docker pull hello-world
latest: Pulling from hello-world
535020c3e8ad: Pull complete
af340544ed62: Pull complete
Digest: sha256:a68868bfe696c00866942e8f5ca39e3e31b79c1e50feaee4ce5e28df2f051d5c
Status: Downloaded newer image for hello-world:latest
~ $
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RUN Command
~ $ docker run -h
Usage: docker run [OPTIONS] IMAGE [COMMAND] [ARG...]
Run a command in a new container
-a, --attach=[] Attach to STDIN, STDOUT or STDERR
--add-host=[] Add a custom host-to-IP mapping (host:ip)
--blkio-weight=0 Block IO weight (relative weight)
-c, --cpu-shares=0 CPU shares (relative weight)
[...]
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RUN Command
~ $ docker run ubuntu:latest echo "Docker is awesome"
Unable to find images 'ubuntu:latest' locally
latest: Pulling from ubuntu
d3a1f33e8a5a: Pull complete
c22013c84729: Pull complete
d74508fb6632: Pull complete
91e54dfb1179: Pull complete
ubuntu:latest: The image you are pulling has been verified.
Digest: sha256:73fbe2308f5f5cb6e343425831b8ab44f10bbd77070ecdfbe4081daa4dbe3ed1
Status: Downloaded newer image for ubuntu:latest
Docker is awesome
~ $
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ocker run -it ubuntu:latest /bin/bash
b91b6d0cf193:/# ls
boot dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
b91b6d0cf193:/# exit
RUN Command
~ $ docker run ubuntu:latest echo "Docker is awesome"
Unable to find images 'ubuntu:latest' locally
latest: Pulling from ubuntu
d3a1f33e8a5a: Pull complete
c22013c84729: Pull complete
d74508fb6632: Pull complete
91e54dfb1179: Pull complete
ubuntu:latest: The image you are pulling has been verified.
Digest: sha256:73fbe2308f5f5cb6e343425831b8ab44f10bbd77070ecdfbe4081daa4dbe3ed1
Status: Downloaded newer image for ubuntu:latest
Docker is awesome
~ $
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images & rmi command
~ $ docker images -h
Usage: docker images [OPTIONS] [REPOSITORY]
List images
-a, --all=false Show all images (default hides intermediate images)
--digests=false Show digests
-f, --filter=[] Filter output based on conditions provided
--help=false Print usage
--no-trunc=false Don't truncate output
-q, --quiet=false Only show numeric IDs
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images & rmi command
r images
Y TAG IMAGE ID CREATED VIRTUAL
latest 91e54dfb1179 16 minutes ago 188.4 MB
ld latest af340544ed62 4 minutes ago 960 B
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images & rmi command
er images
RY TAG IMAGE ID CREATED VIRTUAL
latest 91e54dfb1179 16 minutes ago 188.4 M
rld latest af340544ed62 4 minutes ago 960 B
er rmi -f hello-world
: hello-world:latest
af340544ed62de0680f441c71fa1a80cb084678fed42bae393e543faea3a572c
535020c3e8add9d6bb06e5ac15a261e73d9b213d62fb2c14d752b8e189b2b912
er images
RY TAG IMAGE ID CREATED VIRTUAL
latest 91e54dfb1179 16 minutes ago 188.4 M
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PS & RM command
~ $ docker ps -h
Usage: docker ps [OPTIONS]
List containers
-a, --all=false Show all containers (default shows just running)
--before="" Show only container created before Id or Name
-f, --filter=[] Filter output based on conditions provided
-l, --latest=false Show the latest created container, include non-running
-n=-1 Show n last created containers, include non-running
--no-trunc=false Don't truncate output
-q, --quiet=false Only display numeric IDs
-s, --size=false Display total file sizes
--since="" Show created since Id or Name, include non-running
--format=[] Pretty-print containers using a Go template
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PS & RM command
IMAGE COMMAND CREATED STATUS PORTS N
postgres:latest "/docker-entrypoint. 8 seconds ago Up 7 seconds 5432/tcp p
ubuntu:latest "sleep 20000000" 41 seconds ago Up 40 seconds a
ubuntu:latest "/bin/bash" About a minute ago Up About a minute i
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PS & RM command
-f 89951e446cf0
IMAGE COMMAND CREATED STATUS PORTS N
ubuntu:latest "sleep 20000000" 41 seconds ago Up 40 seconds a
ubuntu:latest "/bin/bash" About a minute ago Up About a minute i
s
IMAGE COMMAND CREATED STATUS PORTS
postgres:latest "/docker-entrypoint. 8 seconds ago Up 7 seconds 5432/tcp
ubuntu:latest "sleep 20000000" 41 seconds ago Up 40 seconds
ubuntu:latest "/bin/bash" About a minute ago Up About a minute
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exec command
~ $ docker exec -h
Usage: docker exec [OPTIONS] CONTAINER COMMAND [ARG...]
Run a command in a running container
-d, --detach=false Detached mode: run command in the background
-i, --interactive=false Keep STDIN open even if not attached
-t, --tty=false Allocate a pseudo-TTY
-u, --user= Username or UID (format: [:])
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exec command
IMAGE COMMAND CREATED STATUS PORTS N
postgres:latest "/docker-entrypoint. 8 seconds ago Up 7 seconds 5432/tcp p
ubuntu:latest "sleep 20000000" 41 seconds ago Up 40 seconds a
ubuntu:latest "/bin/bash" About a minute ago Up About a minute i
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exec command
IMAGE COMMAND CREATED STATUS PORTS NA
postgres:latest "/docker-entrypoint. 8 seconds ago Up 7 seconds 5432/tcp pe
ubuntu:latest "sleep 20000000" 41 seconds ago Up 40 seconds ad
ubuntu:latest "/bin/bash" About a minute ago Up About a minute in
exec -it dd5fe50ab712 /bin/bash
50ab712:/# ls
dev etc home lib lib64 media mnt opt proc root run sbin srv sys tmp usr var
50ab712:/# exit
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Docker Volume
“ A data volume is a specially-
designated directory within one
or more containers that bypasses
the .
Union File System
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Docker Volume
~ $ ls /Users/baptou/myDirectory
file1 file2 file3
~ $ docker run -it -v /Users/baptou/myDirectory:/opt ubuntu:latest /bin/bash
root@29088b02f260:/# ls /opt
file1 file2 file3
root@29088b02f260:/# rm /opt/file2
root@29088b02f260:/# ls /opt
file1 file3
root@29088b02f260:/# exit
exit
~ $ ls /Users/baptou/myDirectory
file1 file3
~ $
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Docker COMMIT
~ $ docker commit -h
Usage: docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]
Create a new image from a container's changes
-a, --author="" Author (e.g., "John Hannibal Smith ")
-c, --change=[] Apply specified Dockerfile instructions while committing the image
-m, --message="" Commit message
-p, --pause=true Pause container during commit
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Docker COMMIT
-d ubuntu /bin/bash -c "apt-get install -y hello"
123ee
it -m "My first container with a Commit" 009e8061df58b8b123ee gilson/hello
5427d39bf6971f8415511fdaa3182a37869c14c4893664c43
es
TAG IMAGE ID CREATED VIRTUAL SIZE
latest b88f9422f14d 7 seconds ago 189.3 MB
latest 34cd8b4a3d8b 4 weeks ago 163 MB
ront latest 63a5a64ddc7a 4 weeks ago 163 MB
front latest 63a5a64ddc7a 4 weeks ago 163 MB
gilson/hello
lists...
ency tree...
nformation...
y the newest version.
ewly installed, 0 to remove and 0 not upgraded.
-it gilson/hello /bin/bash
9a:/# hello
9a:/# exit
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Docker push
~ $ docker push -h
Usage: docker push NAME[:TAG]
Push an image or a repository to the registry
--disable-content-trust=true Skip image signing
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Docker push
~ $ docker push baptwaels/hello
The push refers to a repository [baptwaels/hello] (len: 1)
b88f9422f14d: Image push failed
Please login prior to push:
Username: baptwaels
Password:
Email: [email protected]
WARNING: login credentials saved in /Users/baptou/.dockercfg.
Login Succeeded
The push refers to a repository [baptwaels/hello] (len: 1)
b88f9422f14d: Image already exists
91e54dfb1179: Image successfully pushed
d74508fb6632: Image successfully pushed
c22013c84729: Image successfully pushed
d3a1f33e8a5a: Image successfully pushed
Digest: sha256:d659f9011eab6d04b3d9fd9f6324e23505bd1299c52d295c4b04ebe3e58878ce
~ $
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Docker push
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FROM ubuntu:latest
RUN apt-get install vim -y
Docker build
Dockerfile
~ $ docker build -t myubuntu .
~ $ docker images
REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE
myubuntu latest 4b205af179df 5 seconds ago 188.9 MB
Shell
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Docker system
Usage: docker system COMMAND
Manage Docker
Options:
--help Print usage
Commands:
df Show docker disk usage
events Get real time events from the server
info Display system-wide information
prune Remove unused data
Run 'docker system COMMAND --help' for more information on a command.
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Docker system
~ $ docker system df
TYPE TOTAL ACTIVE SIZE RECLAIMABLE
Images 8 5 1.296GB 729.3MB (56%)
Containers 6 1 408B 345B (84%)
Local Volumes 4 4 168.6MB 0B (0%)
system df
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Docker system
~ $ docker system df -v
Images space usage:
REPOSITORY TAG IMAGE ID CREATED ago (...)
pen_banco latest 8e40d6a09c39 About an hour ago
postgres 9.3 0dd7d39ff91b 2 days ago
postgres latest ca3a55649cfc 2 days ago
docker_apoiador-banco latest 556796db6132 4 days ago
mdillon/postgis 9.5 95ef56d0b84b 6 days ago
rabbitmq 3-management 281ee777b811 12 days ago
hello-world latest 48b5124b2768 4 months ago
jhipster/jhipster-registry v2.5.4 f5ac510b0620 6 months ago
Containers space usage:
CONTAINER ID IMAGE COMMAND LOCAL VOLUMES (
b484a4673c73 postgres:latest "docker-entrypoint..." 0
00515c9b728a docker_banco-teste "docker-entrypoint..." 1
25e7b744d869 docker_apoiador-banco "docker-entrypoint..." 1
8bb66b298716 rabbitmq:3-management "docker-entrypoint..." 1
6718c15a2bde jhipster/jhipster-registry:v2.5.4 "java -Djava.secur..." 1
ff1de954a916 hello-world "/hello" 0
Local Volumes space usage:
VOLUME NAME LINKS SIZE
31f5e396aefc175501357305306bbb691243f9f41a98bb1aeca36d129d36c97f 1 2.597MB
dc091727d965df0debed796e5381c47001ab8881141fde44fa578bb2a169850b 1 151.7kB
e60cb462042b9b52800f019b13af1e7d49856d3f57ea7515d02eba5741960254 1 82.96MB
09212ad7c68f115564f0e5f06248df66458cf5618f814d17af67a400bc7aba52 1 82.93MB
system df -v
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Docker system
~ $ docker system prune
WARNING! This will remove:
- all stopped containers
- all volumes not used by at least one container
- all networks not used by at least one container
- all dangling images
Are you sure you want to continue? [y/N]
system prune
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Dockerfile
“ A Dockerfile is a text
document that contains all the
commands a user could call on
the command line to assemble
an image.
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FROM ubuntu:latest
# (...)
Dockerfile
Command FROM
Sets the for subsequent instructions. As such, a valid
Dockerfile must have FROM as its first instruction. The image
can be any valid image – it is especially easy to start by pulling an
image from the .
Base Image
Public Repositories
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FROM ubuntu:latest
MAINTAINER Gilson Filho
# (...)
Dockerfile
Command MAINTAINER
The MAINTAINER instruction allows you to set the Author field of the
generated images.
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FROM ubuntu:latest
# MAINTAINER ...
RUN apt-get update
# Other dependencies...
RUN apt-get install -y mysql-server
# Configure database and user...
RUN ["mysql", "-u", "root", "-p"]
Dockerfile
Command RUN
The RUN instruction will execute any commands in a new layer
on top of the current image and commit the results. The
resulting comitted image will be used for the next step in the
Dockerfile.
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FROM ubuntu:latest
# MAINTAINER ...
RUN apt-get update
# Other dependencies...
RUN apt-get install -y mysql-server
# Configure database and user...
CMD ["mysqld"]
Dockerfile
Command CMD
The main purpose of a CMD is to provide defaults for an executing
container. There can only be one CMD instruction in a Dockerfile.
If you list more than one CMD then only the last CMD will take effect.
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FROM ubuntu:latest
# MAINTAINER ...
RUN apt-get update
# Other dependencies...
RUN apt-get install -y mysql-server
# Configure database and user...
EXPOSE 3306
CMD ["mysqld"]
Dockerfile
Command EXPOSE
The EXPOSE instruction informs Docker that the container listens on
the specified network ports at runtime. EXPOSE does not make the
ports of the container accessible to the host.
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FROM ubuntu:latest
# MAINTAINER ...
ENV MYSQL_MAJOR 5.7
RUN apt-get update
# Other dependencies...
RUN apt-get install -y mysql-server
# (...)
Dockerfile
Command ENV
The ENV instruction sets the environment variable to the
value . This value will be in the environment of all
“descendant” Dockerfile commands and can be in
many as well.
replaced inline
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FROM ubuntu:latest
# MAINTAINER ...
ENV MYSQL_MAJOR 5.7
RUN apt-get update
# Other dependencies...
RUN apt-get install -y mysql-server
# Configure database and user...
ADD custom.conf /var/lib/mysql
# (...)
Dockerfile
Command ADD
The ADD instruction copies new files, directories or remote file URLs
from and adds them to the filesystem of the container at the
path .
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FROM ubuntu:latest
# MAINTAINER ...
ENV MYSQL_MAJOR 5.7
RUN apt-get update
# Other dependencies...
RUN apt-get install -y mysql-server
# Configure database and user...
COPY custom.conf /var/lib/mysql
# (...)
Dockerfile
Command COPY
The COPY instruction copies new files or directories from and
adds them to the filesystem of the container at the path .
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FROM ubuntu:latest
# MAINTAINER ...
RUN apt-get update
RUN apt-get install -y python-pip
RUN pip install ipython
ENTRYPOINT ["ipython"]
Dockerfile
Command ENTRYPOINT
An ENTRYPOINT allows you to configure a container that will run as
an executable.
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CMD or ENTRYPOINT?
1. Dockerfile should specify at least one of CMD or ENTRYPOINT commands.
2. ENTRYPOINT should be defined when using the container as an executable.
3. CMD should be used as a way of defining default arguments for an ENTRYPOINT
command or for executing an ad-hoc command in a container.
4. CMD will be overridden when running the container with alternative arguments.
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FROM ubuntu:latest
# (...)
RUN mkdir /myvol
RUN echo "hello world" > /myvol/greeting
VOLUME /myvol
Dockerfile
Command VOLUME
The VOLUME instruction creates a mount point with the specified
name and marks it as holding externally mounted volumes from
native host or other containers.
The docker run command initializes the newly created volume with
any data that exists at the specified location within the base image.
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FROM ubuntu:latest
RUN mkdir -p /var/whoami
RUN chmod -R 777 /var/whoami
RUN whoami >> /var/whoami/root.txt
# Criando usuario
RUN useradd basis -p 1234
USER basis
RUN whoami >> /var/whoami/basis.txt
Dockerfile
Command USER
The USER instruction sets the user name or UID to use when
running the image and for any RUN, CMD and
ENTRYPOINT instructions that follow it in the Dockerfile.
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FROM ubuntu:latest
RUN pwd
WORKDIR /opt
RUN pwd
RUN touch file_opt.txt
WORKDIR /var
RUN pwd
RUN touch file_var.txt
Dockerfile
Command WORKDIR
The WORKDIR instruction sets the working directory for any RUN,
CMD, ENTRYPOINT, COPY and ADD instructions that follow it in the
Dockerfile. If the WORKDIR doesn’t exist, it will be created even if
it’s not used in any subsequent Dockerfile instruction.
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FROM ubuntu:latest
# Other configurations...
ONBUILD RUN echo "Echo message made by image base"
Dockerfile
Command ONBUILD
The ONBUILD instruction adds to the image a trigger instruction to
be executed at a later time, when the image is used as the base for
another build. The trigger will be executed in the context of the
downstream build, as if it had been inserted immediately after the
FROM instruction in the downstream Dockerfile.
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FROM ubuntu:latest
# Other configurations...
HEALTHCHECK --interval=5m --timeout=3s \
CMD curl -f http://localhost/ || exit 1
Dockerfile
Command HEALTHCHECK
The HEALTHCHECK instruction tells Docker how to test a container
to check that it is still working. This can detect cases such as a web
server that is stuck in an infinite loop and unable to handle new
connections, even though the server process is still running.
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Other commands
https:/
/docs.docker.com/engine/reference/builder/
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Orquestration
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App
Database
link
App
link
Storage
link
Storage
link
link
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App
Database
link
App
link
Storage
link
Storage
link
link
Docker Host
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Docker Host Docker Host
Docker Host Docker Host
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Orquestration
“ Orchestration is a broad term that
refers to the container scheduling,
cluster management, and possibly
the provision of additional hosts.
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No content
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No content
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Tools
Rancher
Docker Swarm
Fleet
Kubernetes
Mesos
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Docker Compose
“ Compose is a tool for defining and
running multi-container Docker
applications.
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Docker Compose
1. Define your app’s environment with a Dockerfile so it can be
reproduced anywhere.
2. Define the services that make up your app in docker-
compose.yml so they can be run together in an isolated
environment.
3. Lastly, run docker-compose up and Compose will start and run
your entire app.
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version: '2'
services:
db:
image: mysql:5.7
volumes:
- "./.data/db:/var/lib/mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: wordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
wordpress:
depends_on:
- db
image: wordpress:latest
links:
- db
ports:
- "8000:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_PASSWORD: wordpress
docker-compose.yml
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web:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
redis:
image: redis
Versions
Compose files using the version 2 syntax must indicate the version
number at the root of the document. Compose files that do not
declare a version are considered “version 1”.
docker-compose.yml
version: '2'
services:
web:
build: .
ports:
- "5000:5000"
volumes:
- .:/code
redis:
image: redis
Version 1 Version 2
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web:
build: .
# (...)
Command BUILD
Configuration options that are applied at build time. Can be
specified either as a string containing a path to the build context, or
an object with the path specified under and optionally
and .
context
dockerfile args
docker-compose.yml
version: '2'
services:
web:
build:
context: ./app
dockerfile: Dockerfile-alternate
# (...)
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version: '2'
services:
web:
# hub.docker.com/_/ubuntu:latest
image: ubuntu:latest
# (...)
Command IMAGE
Specify the image to start the container from. Can either be a
repository/tag or a partial image ID.
docker-compose.yml
version: '2'
services:
web:
image: example-registry.com:4000/postgresql
# (...)
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Command VOLUME
Mount paths or named volumes, optionally specifying a path on the
host machine (HOST:CONTAINER), or an access mode
(HOST:CONTAINER:ro).
docker-compose.yml
# (...)
web:
image: mysql:5.1
volumes:
# Just specify a path and let the Engine create a volume
- /var/lib/mysql
# Specify an absolute path mapping
- /opt/data:/var/lib/mysql
# Path on the host, relative to the Compose file
- ./cache:/tmp/cache
# User-relative path
- ~/configs:/etc/configs/:ro
# Named volume
- datavolume:/var/lib/mysql
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Command VOLUME_FROM
Mount paths or named volumes, optionally specifying a path on the
host machine (HOST:CONTAINER), or an access mode
(HOST:CONTAINER:ro).
docker-compose.yml
# (...)
web:
image: mysql:5.1
volumes:
- /var/lib/mysql
volumes_from:
- service_name
- service_name:ro
- container:container_name
- container:container_name:rw
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Command ENVIRONMENT
Add environment variables. You can use either an array or a
dictionary.
docker-compose.yml
version: '2'
services:
db:
image: mysql:5.7
volumes:
- "./.data/db:/var/lib/mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: wordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
version: '2'
services:
db:
image: mysql:5.7
volumes:
- "./.data/db:/var/lib/mysql"
restart: always
environment:
- MYSQL_ROOT_PASSWORD=wordpress
- MYSQL_DATABASE=wordpress
- MYSQL_USER=wordpress
- MYSQL_PASSWORD=wordpress
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Command LINKS
Link to containers in another service. Either specify both the service
name and a link alias (SERVICE:ALIAS), or just the service name.
docker-compose.yml
version: '2'
services:
db:
image: mysql:5.7
volumes:
- "./.data/db:/var/lib/mysql"
environment:
- MYSQL_ROOT_PASSWORD=wordpress
- MYSQL_DATABASE=wordpress
- MYSQL_USER=wordpress
- MYSQL_PASSWORD=wordpress
redis:
# (...)
web:
image: wordpress:latest
links:
- db
- redis
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Command DEPENDS_ON
Express dependency between services, which has two effects:
docker-compose up will start services in dependency order. In the following example, db
and redis will be started before web.
docker-compose up SERVICE will automatically include SERVICE’s dependencies. In the
following example, docker-compose up web will also create and start db and redis.
docker-compose.yml
version: '2'
services:
db:
image: mysql:5.7
# (...)
web:
image: wordpress:latest
depends_on:
- redis
- db
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Command PORTS
Expose ports. Either specify both ports (HOST:CONTAINER), or just
the container port (a random host port will be chosen).
docker-compose.yml
version: '2'
services:
wordpress:
image: wordpress:latest
ports:
- "8000:80"
version: '2'
services:
wordpress:
image: wordpress:latest
ports:
- "3000"
- "3000-3005"
- "8000:8000"
- "9090-9091:8080-8081"
- "49100:22"
- "127.0.0.1:8001:8001"
- "127.0.0.1:5000-5010:5000-5010"
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Command COMMAND
Override the default command.
docker-compose.yml
version: '2'
services:
wordpress:
image: wordpress:latest
# Override 'CMD ["apache2-foreground"]' of wordpress Dockerfile
command: bash
ports:
- "8000:80"
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Command ENTRYPOINT
Override the default entrypoint.
docker-compose.yml
version: '2'
services:
wordpress:
image: wordpress:latest
# Override 'CMD ["./entrypoint.sh"]' of wordpress Dockerfile
entrypoint: ./custom-entrypoint.sh
ports:
- "8000:80"
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Command ENV_FILE
Add environment variables from a file. Can be a single value or a list.
docker-compose.yml
version: '2'
services:
wordpress:
image: wordpress:latest
ports:
- "8000:80"
env_file: .env
version: '2'
services:
wordpress:
image: wordpress:latest
ports:
- "8000:80"
env_file:
- ./common.env
- ./apps/web.env
- /opt/secrets.env
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Command EXPOSE
Expose ports without publishing them to the host machine - they’ll
only be accessible to linked services. Only the internal port can be
specified.
docker-compose.yml
version: '2'
services:
db:
image: mysql:5.7
volumes:
- "./.data/db:/var/lib/mysql"
restart: always
environment:
MYSQL_ROOT_PASSWORD: wordpress
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: wordpress
expose:
- "3306"
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Command EXTENDS
Extend another service, in the current file or another, optionally
overriding configuration.
docker-compose.yml
web:
extends:
file: common-services.yml
service: webapp
webapp:
build: .
ports:
- "8000:8000"
volumes:
- "/data"
common-services.yml docker-compose.yml
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Resources
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No content
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https://www.pluralsight.com/browse/it-ops/docker
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Examples
https:/
/github.com/gilsondev/workshop-docker
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Getting Started
https:/
/docs.docker.com/get-started
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Raffle!
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No content
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Vale Presente
Casa do Código
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Email: [email protected]
Blog:
Telegram/Github: @gilsondev
Twitter:
gilsondev.in
@gilsonfilho
Questions?
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