Volume Bind Mount

Persistência dos dados

Edição do arquivo compose.yaml:

~/compose$ vim compose.yaml

Especificação do volume com caminho absoluto:

version: "3.8"

services:
  postgre:
    image: postgres:13.16
    ports:
      - 5432:5432
    environment:
      POSTGRES_PASSWORD: kubenews
      POSTGRES_USER: kubenews
      POSTGRES_DB: kubenews
    volumes:
      - /home/marcelo/compose/postgre-vol:/var/lib/postgresql/data 

Pode ser utilizado o caminho relativo. O diretório base será o diretório do arquivo compose.yaml:

    volumes:
      - ./postgre-vol:/var/lib/postgresql/data 

Subida do Docker Compose:

~/compose$ docker compose up -d
WARN[0000] /home/marcelo/compose/compose.yaml: the attribute `version` is obsolete, 
it will be ignored, please remove it to avoid potential confusion
[+] Running 1/1
 ✔ Container compose-postgre-1  Started                                     0.8s

Container em execução:

~/compose$ docker container ls -a
CONTAINER ID   IMAGE            COMMAND                  CREATED          STATUS          PORTS                                       NAMES
03d44308a992   postgres:13.16   "docker-entrypoint.s…"   29 seconds ago   Up 28 seconds   0.0.0.0:5432->5432/tcp, :::5432->5432/tcp   compose-postgre-1

Verificação do diretório postgre-vol/ criado e seu conteúdo:

~/compose$ ls
compose.yaml  postgre-vol

~/compose$ sudo ls postgre-vol/
[sudo] password for marcelo:
PG_VERSION       pg_commit_ts     pg_ident.conf         pg_notify        pg_snapshots
pg_subtrans      pg_wal           postgresql.conf       base             pg_dynshmem
pg_logical       pg_replslot      pg_stat               pg_tblspc        pg_xact
postmaster.opts  global           pg_hba.conf           pg_multixact     pg_serial
pg_stat_tmp      pg_twophase      postgresql.auto.conf  postmaster.pid

Teste de conexão e criação de uma tabela e coluna:

Remoção do container:

$ docker container ls
CONTAINER ID   IMAGE            COMMAND                  CREATED         STATUS         PORTS                                       NAMES
03d44308a992   postgres:13.16   "docker-entrypoint.s…"   6 minutes ago   Up 6 minutes   0.0.0.0:5432->5432/tcp, :::5432->5432/tcp   compose-postgre-1
$ docker container rm -f 03d44308a992
03d44308a992

Subida do Docker Compose novamente:

~/compose$ docker compose up -d
WARN[0000] /home/marcelo/compose/compose.yaml: the attribute `version` is obsolete, it will be ignored, please remove it to avoid potential confusion
[+] Running 1/1
 ✔ Container compose-postgre-1  Started 

Teste de conexão com a verificação da persistência dos dados: