Docker Commit na Prática

Criação do container

Criação do container da aplicação para avaliar o Docker Commit na prática:

$ pwd
/tmp/devops-conversao-temperatura/src
$ docker container ls -a
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
$ docker container run -it -p 8080:8080 ubuntu /bin/bash
root@46ad702f0dd8:/# node -v

Referência:

Executando a sua primeira aplicação em containers

Instruções para instalação do NodeJS:

GitHub - nodesource/distributions: NodeSource Node.js Binary DistributionsGitHub

Instruções obtidas para instalação do Node.js 22.x no Ubuntu:

root@46ad702f0dd8:/# apt-get update
root@46ad702f0dd8:/# apt-get install -y curl
root@46ad702f0dd8:/# curl -fsSL https://deb.nodesource.com/setup_22.x -o nodesource_setup.sh
root@46ad702f0dd8:/# bash -E nodesource_setup.sh
root@46ad702f0dd8:/# apt-get install -y nodejs
root@46ad702f0dd8:/# apt-get update
root@46ad702f0dd8:/# node -v
v22.6.0

$ pwd
/tmp/devops-conversao-temperatura/src

$ docker container ls
CONTAINER ID   IMAGE     COMMAND       CREATED         STATUS         PORTS                                       NAMES
46ad702f0dd8   ubuntu    "/bin/bash"   6 minutes ago   Up 6 minutes   0.0.0.0:8080->8080/tcp, :::8080->8080/tcp   heuristic_cori

$ docker container cp . 46ad702f0dd8:/app
Successfully copied 20.9MB to 46ad702f0dd8:/app

root@46ad702f0dd8:/# pwd
/app
root@46ad702f0dd8:/# ls
Dockerfile  config  convert.js  node_modules  package-lock.json  package.json  server.js  test  views

root@46ad702f0dd8:/# npm install
root@46ad702f0dd8:/# node server.js
Servidor rodando na porta 8080

Docker Commit

Parar e remover o container para criação da imagem:

root@46ad702f0dd8:/# exit

$ docker container ls -a
CONTAINER ID   IMAGE     COMMAND       CREATED          STATUS                        PORTS     NAMES
46ad702f0dd8   ubuntu    "/bin/bash"   11 minutes ago   Exited (130) 17 seconds ago             heuristic_cori

$ docker commit 46ad702f0dd8 conversao-temperatura
sha256:ad6bf598faaf5ee0df76116cc7fbb34f35b8dd5c4603e1a0be30ffbe850cae59

$ docker image ls
REPOSITORY              TAG       IMAGE ID       CREATED          SIZE
conversao-temperatura   latest    ad6bf598faaf   51 seconds ago   377MB
ubuntu                  latest    35a88802559d   2 months ago     78.1MB

$ docker container ls -a
CONTAINER ID   IMAGE     COMMAND       CREATED          STATUS                       PORTS     NAMES
46ad702f0dd8   ubuntu    "/bin/bash"   13 minutes ago   Exited (130) 2 minutes ago             heuristic_cori

$ docker container rm 46ad702f0dd8
46ad702f0dd8

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

Criação da imagem

1. Sem passar comando

$ docker container run -it -p 8080:8080 conversao-temperatura /bin/bash
root@43ed3f1a1824:/# cd app/
root@43ed3f1a1824:/# node server.js
Servidor rodando na porta 8080

root@43ed3f1a1824:/app# exit
exit

2. Passando o comando

$ docker container run -d -p 8080:8080 conversao-temperatura node /app/server.js
ac5f754cd00bbab8327fc376a03518bb04036d1f666c61149d726c48854a10c5

$ docker container ls
CONTAINER ID   IMAGE                   COMMAND                 CREATED          STATUS          PORTS                                       NAMES
ac5f754cd00b   conversao-temperatura   "node /app/server.js"   25 seconds ago   Up 25 seconds   0.0.0.0:8080->8080/tcp, :::8080->8080/tcp   hopeful_cerf