Docker Network - Bridge

Rede não nomeada

Edição do arquivo compose.yaml para especificar a rede e inserir o container kubenews:

~/compose$ vim compose.yaml

Arquivo compose.yaml:

services:
  postgre:
    image: postgres:13.16
    ports:
      - 5432:5432
    environment:
      POSTGRES_PASSWORD: kubenews
      POSTGRES_USER: kubenews
      POSTGRES_DB: kubenews
    volumes:
      - postgre-docker-vol:/var/lib/postgresql/data
    networks:
      - kubenews-net
  kubenews:
    image: marcelodpbarbieri/kube-news:v1
    ports:
      - 8080:8080
    environment:
      DB_DATABASE: kubenews
      DB_USERNAME: kubenews
      DB_PASSWORD: kubenews
      DB_HOST: postgre
    networks:
      - kubenews-net

volumes:
  postgre-docker-vol:

networks:
  kubenews-net:
    driver: bridge

Apesar de ter um container em execução, como o arquivo compose.yaml foi alterado, basta subir novamente o Docker Compose:

~/compose$ docker container ls -a
CONTAINER ID   IMAGE            COMMAND                  CREATED        STATUS                        PORTS                                       NAMES
0975a117c23f   postgres:13.16   "docker-entrypoint.s…"   10 hours ago   Exited (255) 10 minutes ago   0.0.0.0:5432->5432/tcp, :::5432->5432/tcp   compose-postgre-1

~/compose$ docker compose up -d
[+] Running 4/4
 ✔ Network compose_kubenews-net         Created                 0.2s
 ✔ Volume "compose_postgre-docker-vol"  Created                 0.0s
 ✔ Container compose-kubenews-1         Started                 0.6s
 ✔ Container compose-postgre-1          Started                 0.6s

O container da aplicação não permaneceu em execução, provavelmente porque o banco de dados não estava disponível e por haver disposição da aplicação em terminar a sua execução caso não consiga se conectar ao banco de dados:

~/compose$ docker container ls
CONTAINER ID   IMAGE            COMMAND                  CREATED          STATUS          PORTS                                       NAMES
7a11dbe19341   postgres:13.16   "docker-entrypoint.s…"   32 seconds ago   Up 31 seconds   0.0.0.0:5432->5432/tcp, :::5432->5432/tcp   compose-postgre-1

~/compose$ docker container ls -a
CONTAINER ID   IMAGE                            COMMAND                  CREATED              STATUS                          PORTS
                NAMES
a2ec9c905154   marcelodpbarbieri/kube-news:v1   "docker-entrypoint.s…"   About a minute ago   Exited (1) About a minute ago
                compose-kubenews-1
7a11dbe19341   postgres:13.16                   "docker-entrypoint.s…"   About a minute ago   Up About a minute               0.0.0.0:5432->5432/tcp, :::5432->5432/tcp   compose-postgre-1

Neste momento basta subir novamente o Compose Docker para iniciar a execução do container da aplicação:

~/compose$ docker compose up -d
[+] Running 2/2
 ✔ Container compose-postgre-1   Runni...                               0.0s
 ✔ Container compose-kubenews-1  Star...                                0.3s

~/compose$ docker container ls
CONTAINER ID   IMAGE                            COMMAND                  CREATED         STATUS          PORTS                                       NAMES
a2ec9c905154   marcelodpbarbieri/kube-news:v1   "docker-entrypoint.s…"   4 minutes ago   Up 14 seconds   0.0.0.0:8080->8080/tcp, :::8080->8080/tcp   compose-kubenews-1
7a11dbe19341   postgres:13.16                   "docker-entrypoint.s…"   4 minutes ago   Up 4 minutes    0.0.0.0:5432->5432/tcp, :::5432->5432/tcp   compose-postgre-1

Se quiser alterar a versão da imagem basta editar o arquivo compose.yaml e subir o Docker Compose novamente:

  kubenews:
    image: marcelodpbarbieri/kube-news:v2

~/compose$ docker compose up -d
[+] Running 2/2
 ✔ Container compose-postgre-1   Running                                        0.0s
 ✔ Container compose-kubenews-1  Started                                       10.9s

A versão 2 da imagem alterar o título do botão NOVO POST:

Rede nomeada

A nomeação de uma rede e a utilização de uma rede externa também se aplica:

networks:
  kubenews-net:
    name: knews-net

~/compose$ docker compose up -d
[+] Running 3/1
 ✔ Network knews-net             Created                                        0.1s
 ✔ Container compose-postgre-1   Running                                        0.0s
 ✔ Container compose-kubenews-1  Running                                        0.0s

~/compose$ docker network ls
NETWORK ID     NAME                   DRIVER    SCOPE
8bdc41bf638d   bridge                 bridge    local
b58c5ddf00bd   compose_kubenews-net   bridge    local
73f2d51a39de   host                   host      local
a1a78a589913   knews-net              bridge    local
9198ba9fc6fd   none                   null      local

Rede externa

~/compose$ docker compose down
[+] Running 3/3
 ✔ Container compose-kubenews-1  Removed                                       10.4s
 ✔ Container compose-postgre-1   Removed                                        0.5s
 ✔ Network knews-net             Removed                                        0.6s

~/compose$ docker container ls -a
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES

~/compose$ docker network ls
NETWORK ID     NAME      DRIVER    SCOPE
8bdc41bf638d   bridge    bridge    local
73f2d51a39de   host      host      local
9198ba9fc6fd   none      null      local

Criação de uma rede:

~/compose$ docker network create network-externa
27d39cb6b964378949537803339980fde178a46946a9e19042d1c293a72f1814

Edição do arquivo compose.yaml:

networks:
  kubenews-net:
    name: network-externa
    external: true
    driver: bridge

Subida do Docker Compose:

~/compose$ docker compose up -d
[+] Running 2/2
 ✔ Container compose-postgre-1   Started                                        0.5s
 ✔ Container compose-kubenews-1  Started                                        0.4s