Docker Top

Descrição

O comando docker top exibe os processos em execução dentro de um container. É útil para ver quais processos estão ativos e monitorar o uso de recursos.

U$so

docker top CONTAINER [OPTIONS]

Exemplo de Uso

docker top my_container

Exemplo de Saída

UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                1234                1                   0                   Sep07               ?                   00:00:01            /bin/bash

Quando Usar

• Monitoramento de Processos: Para verificar quais processos estão rodando dentro do container e diagnosticar problemas relacionados ao uso de recursos.

Laboratório

$ docker container ls
CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS          PORTS                                   NAMES
9ba71cfedb2b   nginx     "/docker-entrypoint.…"   17 minutes ago   Up 17 minutes   0.0.0.0:8080->80/tcp, :::8080->80/tcp   affectionate_galois

$ docker container top 9ba71cfedb2b
UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                90368               90350               0                   15:28               ?                   00:00:00            nginx: master process nginx -g daemon off;
systemd+            90419               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90420               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90421               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90422               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90423               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90424               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90425               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90426               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90427               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90428               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90429               90368               0                   15:28               ?                   00:00:00            nginx: worker process
systemd+            90430               90368               0                   15:28               ?                   00:00:00            nginx: worker process

$ docker container run -d -p 8181:8080 marcelodpbarbieri/conversao-temperatura:v1
Unable to find image 'marcelodpbarbieri/conversao-temperatura:v1' locally
v1: Pulling from marcelodpbarbieri/conversao-temperatura
31e907dcc94a: Pull complete
2b84bdeb597a: Pull complete
f0392a7398c4: Pull complete
f41b53d4e76c: Pull complete
8dadaaf7622a: Pull complete
Digest: sha256:1fa5eb0aecb5e46bc7ed3e01f3ee9e3c8fb7336f9fea64b8839690825d1fa11b
Status: Downloaded newer image for marcelodpbarbieri/conversao-temperatura:v1
f2c39966bf8e7f4e636f645c7550e5172926a0f0e00037e7dd6dc8ea9806faab

$ docker container ls
CONTAINER ID   IMAGE                                        COMMAND
 CREATED          STATUS          PORTS                                       NAMES
f2c39966bf8e   marcelodpbarbieri/conversao-temperatura:v1   "node server.js"         13 seconds ago   Up 12 seconds   0.0.0.0:8181->8080/tcp, :::8181->8080/tcp   wizardly_lichterman

$ docker container top f2c39966bf8e
UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                95234               95215               0                   15:47               ?                   00:00:00            node server.js