Docker Container Visibility Cheat Sheet

Show Containers

docker ps

Example output:

CONTAINER ID   IMAGE          COMMAND                  CREATED        STATUS        PORTS                    NAMES
a1b2c3d4e5f6   nginx:latest   "/docker-entrypoint.…"   2 hours ago    Up 2 hours    0.0.0.0:80->80/tcp       webserver
b2c3d4e5f6a1   redis:alpine   "docker-entrypoint.s…"   3 hours ago    Up 3 hours    0.0.0.0:6379->6379/tcp   redis-cache

Docker Swarm

docker service ls
docker service ps myservice
docker ps

Example output — docker service ls:

ID             NAME        MODE         REPLICAS   IMAGE          PORTS
x1y2z3a4b5c6   myservice   replicated   3/3        nginx:latest   *:80->80/tcp
d4e5f6g7h8i9   redis       replicated   1/1        redis:alpine

Example output — docker service ps myservice:

ID             NAME          IMAGE          NODE       DESIRED STATE   CURRENT STATE
t1u2v3w4x5y6   myservice.1   nginx:latest   worker1    Running         Running 10 minutes ago
u2v3w4x5y6z7   myservice.2   nginx:latest   worker2    Running         Running 10 minutes ago
v3w4x5y6z7a8   myservice.3   nginx:latest   worker3    Running         Running 10 minutes ago

Docker Compose

Go to the compose folder and run:

docker-compose ps
docker ps

Example output — docker-compose ps:

      Name                    Command               State           Ports
---------------------------------------------------------------------------------
myapp_web_1        nginx -g daemon off;             Up      0.0.0.0:80->80/tcp
myapp_db_1         docker-entrypoint.sh postgres    Up      5432/tcp
myapp_redis_1      docker-entrypoint.sh redis ...   Up      6379/tcp

Docker Compose Stack

Go to the compose folder and run:

docker stack ps mystack

Example output:

ID             NAME              IMAGE          NODE      DESIRED STATE   CURRENT STATE
a1b2c3d4e5f6   mystack_web.1     nginx:latest   node1     Running         Running 5 minutes ago
b2c3d4e5f6a1   mystack_db.1      postgres:14    node2     Running         Running 5 minutes ago
c3d4e5f6a1b2   mystack_redis.1   redis:alpine   node1     Running         Running 5 minutes ago

Note: docker ps will not show containers running in a stack.

Show Ports in Use

sudo lsof -i TCP:9090
sudo lsof -i | grep 9090
less /etc/services

Example output — sudo lsof -i TCP:9090:

COMMAND     PID   USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
prometheus 1234   root   7u  IPv4  98765      0t0  TCP *:9090 (LISTEN)

Example output — sudo lsof -i | grep 9090:

prometheus 1234   root   7u  IPv4  98765      0t0  TCP *:9090 (LISTEN)
chrome     5678   user  23u  IPv4  11223      0t0  TCP localhost:52101->localhost:9090 (ESTABLISHED)