Docker learning - compose

chaney1992 2020-11-08 23:46:13
docker learning compose


Preface

front 《Docker Study —DockerFile》 This paper introduces dockerfile Related grammar , And how to use it ; Let's learn more about docker One of the three swordsmen  Compose; Next, learn more about .

One 、docker-compose Introduce

Docker-Compose The project is Docker Official open source projects , The main use of Python To write ; Used to define and run multiple containers Docker Application tools . Use Compose, have access to YAML file To configure the application's services . And then use a command , Create and start all services from the configuration .

Compose It's a positioning “ Define and run multiple Docker Container application tools ”, Its predecessor is Fig, Currently used Compose Still compatible Fig Format template file .

Compose It contains two important concepts :

  • service (Service): An application container , It can actually contain several container instances running the same image
  • project (Project): A complete business unit consisting of a set of associated application containers , stay docker-compose.yml The document defines

Compose The default management object of is project , A set of containers in a project can be easily lifecycle managed through subcommands .

Two 、docker-compose install

Compose At present, we have fully supported Linux、Mac OS and Windows, In the installation Compose Before , You need to install Docker;( This article is mainly about window Use in )

After the installation is successful, enter :docker compose -h  

3、 ... and 、docker-compose command

After the installation is successful, take a look at compose Mainly contains commands :

 build # Build or rebuild Services
bundle # from Compose File generation Docker bundle
config # Verify and review the documentation
create # Create services
down # Stop and delete container 、 The Internet 、 Images and volumes
events # Receive real-time events from container
exec # Execute the command in the running container
help # Get command help
images # Show a list of mirrors
kill # Kill the container
logs # Check the output of the container
pause # Temporarily Out of Service
port # Public port bound to print port
ps # Show container list
pull # Pull the service image
push # Push service image
restart # Restart the service
rm # Remove the stopped container
run # Run a one-time command
scale # Set the number of containers for the service
start # Start the service
stop # Temporarily Out of Service
top # Show running processes
unpause # Cancel suspension of service
up # Create and start the container
version # Show Docker-Compose Version information 

After a general impression of the order , Next, we need to focus on the key content (docker-compose.yml) understand ; The specific parameters of each command are introduced in detail

3、 ... and 、docker-compose.yml To write

docker-compose.yml There are multiple versions : as follows

  Let's start with an official example docker-compose.yml Content :

version: "3.8"
services:
redis:
image: redis:alpine
ports:
- "6379"
networks:
- frontend
deploy:
replicas: 2
update_config:
parallelism: 2
delay: 10s
restart_policy:
condition: on-failure
db:
image: postgres:9.4
volumes:
- db-data:/var/lib/postgresql/data
networks:
- backend
deploy:
placement:
max_replicas_per_node: 1
constraints:
- "node.role==manager"
vote:
image: dockersamples/examplevotingapp_vote:before
ports:
- "5000:80"
networks:
- frontend
depends_on:
- redis
deploy:
replicas: 2
update_config:
parallelism: 2
restart_policy:
condition: on-failure
result:
image: dockersamples/examplevotingapp_result:before
ports:
- "5001:80"
networks:
- backend
depends_on:
- db
deploy:
replicas: 1
update_config:
parallelism: 2
delay: 10s
restart_policy:
condition: on-failure
worker:
image: dockersamples/examplevotingapp_worker
networks:
- frontend
- backend
deploy:
mode: replicated
replicas: 1
labels: [APP=VOTING]
restart_policy:
condition: on-failure
delay: 10s
max_attempts: 3
window: 120s
placement:
constraints:
- "node.role==manager"
networks:
frontend:
backend:
volumes:
db-data:

 

According to the above example format, we can see that docker-compose.yml It mainly includes the following contents :

  • version: Specify the current docker-compose.yml Version of , Version and Docker Engine There is a corresponding relationship between versions , Such as :v3.8 Corresponding  Docker Engine 19.03.0+
  • services: service , You can define some services that the business needs , Each service can contain a service name 、 Mirror image 、 Mount the data volume 、 The network used 、 Rely on information such as services
  • networks: The network of applications , You can define the network name 、 The type of network used, etc
  • volumes: Data volume , You can define data volumes , Then mount it to different services for use

Next, let's look at the syntax and specific meaning of the relevant commands

docker-compose.yml command
Serial number Belongs to command explain
1 services build be based on Dockerfile, Appoint Dockerfile Location path ,Compose Will use it to build images automatically , Then start the service container  
2 cap_add,cap_drop Add or remove container features
3 command Override commands that are executed by default after the container is started
4 config Use “ Per service configuration ” Configuration grants access to the configuration on a per service basis . There are two ways of grammar : Short grammar 、 Long grammar
5 cgroup_parent Specify an optional parent for the container cgroup
6 container_name Container name
7 depends_on The container depends on , Used to specify other services that the service depends on
8 depoly

Specify the configuration related to the deployment and operation of the service . This is only in use docker stack deploy Takes effect when deployed to a group ,docker compose up and docker compose run This item will be ignored .

9 devices Device mapping list .
10 dns Customize DNS The server . It can be a single value or a list .
11 dns_search Customize DNS Search domain . It can be a single value or a list .
12 entrypoint Override the default entry point
13 env_file Add environment variables from file . It can be a single value or a list
14 environment Add environment variables . You can use arrays or dictionaries . Any Boolean value (true、false、yes、no) All need to be enclosed in quotation marks , To ensure that they are not YML The parser is converted to true or false.
15 expose Expose ports without publishing them to the host - They can only be accessed by linked Services . Only internal ports can be specified .
16 external_links Link to outside of this scope docker-compose.yml Even in Compose Outside the beginning of the container , Especially for containers that provide shared or public services . Specify both container name and link alias () when , please external_links Follow and legacy Similar semantics of options .
17 extra_hosts Add hostname mapping . Use with docker The same value on the client side
18 healthcheck Configure the running checks to determine if the container for the service is “ health ”
19 image Specifies the image from which to start the container . It could be a repository / Label or mirror ID
20 init Run an initialization program inside the container , To forward the signal and get the process . Set this option to true Enable this feature for the service . 
21 isolation Specify the isolation technology of the container . stay Linux On , The only supported values are default. stay Windows in , The acceptable value is default,process and hyperv.
22 labels Use Docker Tags add metadata to the container . You can use arrays or dictionaries .
23 links Link to a container in another service . Specify the service name and link alias ("SERVICE:ALIAS"), Or just specify the service name .
24 logging Logging configuration for services
25 network_mode Network mode . Use the same network name and service as the client service - Parameters docker identical .
26 networks Network to join , Reference the entry under the top-level network key .
27 pid take PID Mode set to host PID Pattern . This will open the... Between the container and the host operating system PID Address space sharing .
28 ports Exposed port  
29 restart no Is the default restart strategy , Under no circumstances will the container be restarted . When always When specified , The container always restarts . The on-failure If the exit code indicates a failure error policy, restart the container .unless-stopped Always restart the container , Unless the container stops ( Manual or other methods ).
30 secrets Use by service secrets To configure , Grant access to secrets by service .
31 security_opt Override the default label scheme for each container .
32 stop_grace_period Specify to send SIGKILL Before , If the container doesn't handle SIGTERM( Or use stop_nusignal Any stop signal specified ), How long to wait when trying to stop the container . Default 10s
33 stop_signal Set an alternate signal to stop the container . By default ,stop Use SIGTERM. Use stop_signal Setting a substitute signal can cause stop Send this signal .
34 sysctls Kernel parameters to set in the container . You can use arrays or dictionaries .
35 tmpfs Install a temporary file system in the container . It can be a single value or a list . 
36 ulimits Override the container's default ulimit. You can specify a single limit as an integer , Can also be soft / The hard limit is specified as a map .
37 userns_mode If Docker The daemons are configured with user namespaces , Then disable the user namespace for this service .
38 volumes

Mount host path or named volume , Specified as a sub option of the service . Host paths can be installed as part of the definition of a single service , And you don't have to be at the top volumes Defined in .

however , If you want to reuse volumes between multiple services , Please at the top volumes A named volume is defined in the key .

Will name volumes and services , Clusters are used with stack files .

39

domainname, hostname, ipc, mac_address, privileged,

read_only, shm_size, stdin_open, tty, user, working_dir

Each of them is a value , Similar to the docker run The corresponding term .
40 Volumes dirver Specifies which volume driver should be used for this volume . The default is Docker Engine Any driver configured to use , Most of the time local.
41 dirver_opts Specify a list of options as key value pairs , To the driver passed to the volume .
42 external If set to true, Specifies that the volume is in Compose Created outside .docker-compose up Don't try to create it , If it doesn't exist, it causes an error .
43 labels Use Docker Tags add metadata to the container . You can use arrays or dictionaries .
44 name Set a custom name for this volume . The name field can be used to refer to volumes that contain special characters .
45 Networks dirver Specify which driver should be used for this network .
46 dirver_opts Specify a list of options as key value pairs for drivers to pass to this network
47 attachable Use only when the driver is set to override .
48 enable_ipv6 Enable on this network IPv6 The Internet .
49 ipam Specify custom IPAM To configure
50 internal By default ,Docker A bridge network is also connected to provide external connections . If you want to create an externally isolated overlay network , You can set this option to true.
51 labels Use Docker Tags add metadata to the container . You can use arrays or dictionaries .
52 external If set to true, Specifies that the network is in Compose Created outside .docker-compose up Don't try to create it , If it doesn't exist, it causes an error .
53 name Set a custom name for this network . The name field can be used to refer to networks that contain special characters .

  Through the above, we find that ,services The relevant order in Chinese is docker Related configuration items are associated with ; Next, we're going to verify that docker-compose.yml Run the application  

Four 、 The application case

Realization effect : When based on Identity Authentication , Related sample code implementation , adopt docker-compose Start all relevant service containers , Run the program .

A、 Add... To the solution directory docker-compose.yml file :

How to add :

1、 Manually add files

2、 adopt vs Automatic addition : Select the item you want to add and right click , Pictured

Add the following :

 

 

B、 The modification is as follows :( The docker-compose.yml Relatively simple )

version: '3.4'
services:
cz.identityserver:
image: ${DOCKER_REGISTRY-}czidentityserver
build:
context: .
dockerfile: cz.IdentityServer/Dockerfile
cz.api.order:
image: ${DOCKER_REGISTRY-}czapiorder
build:
context: .
dockerfile: cz.Api.Order/Dockerfile
cz.api.goods:
image: ${DOCKER_REGISTRY-}czapigoods
build:
context: .
dockerfile: cz.Api.Goods/Dockerfile
cz.mvcclient:
image: ${DOCKER_REGISTRY-}czmvcclient
build:
context: .
dockerfile: cz.MVCClient/Dockerfile

 

C、 Carry out orders docker-compose up command : After execution, you can see the following output , The compilation start is complete .

  D、 stay docker View the following in the management page :

follow-up :

First of all, the content of this article is about docker-compose The contents are introduced , The following will be true of Swarm、Machine、K8S  Do Applied Learning .

Reference resources :

https://docs.docker.com/compose/

https://docs.docker.com/compose/compose-file/

版权声明
本文为[chaney1992]所创,转载请带上原文链接,感谢

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