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Containerization
Long-lived containers

Lesson Notes

Dockerization Lesson Notes

Dockerization Lesson Presentation

Video

Docker In Terminal - Long Lived Containers

  • -d, --detach Run container in background and print container ID.
docker run --rm httpd
# AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
# AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.17.0.2. Set the 'ServerName' directive globally to suppress this message
# [Sat Apr 18 01:31:07.312598 2020] [mpm_event:notice] [pid 1:tid 140057600050304] AH00489: Apache/2.4.43 (Unix) configured -- resuming normal operations
# [Sat Apr 18 01:31:07.312772 2020] [core:notice] [pid 1:tid 140057600050304] AH00094: Command line: 'httpd -D FOREGROUND'
docker run --rm -d httpd
  • port List port mappings or a specific mapping for the container
  • -p, --publish list Publish a container’s port(s) to the host.
docker run -d httpd
docker run -d httpd
docker run -d httpd
docker run --rm -d httpd
docker run --rm -d -p 80:80 httpd
docker run --rm -d -p 8080:80 httpd
docker port nervous_lamarr
# 80/tcp -> 0.0.0.0:8080

  • Docker Bridge Networking

  • logs Fetch the logs of a container.

  • -t, --timestamps Show timestamps.

  • -f, --follow Follow log output.

docker logs nervous_lamarr
# AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.17.0.6. Set the 'ServerName' directive globally to suppress this message
# AH00558: httpd: Could not reliably determine the server's fully qualified domain name, using 172.17.0.6. Set the 'ServerName' directive globally to suppress this message
# [Sat Apr 18 18:02:11.771692 2020] [mpm_event:notice] [pid 1:tid 139892595709056] AH00489: Apache/2.4.43 (Unix) configured -- resuming normal operations
# [Sat Apr 18 18:02:11.772107 2020] [core:notice] [pid 1:tid 139892595709056] AH00094: Command line: 'httpd -D FOREGROUND'
# 172.17.0.1 - - [18/Apr/2020:18:03:02 +0000] "GET / HTTP/1.1" 200 45
# 172.17.0.1 - - [18/Apr/2020:18:03:02 +0000] "GET /favicon.ico HTTP/1.1" 404 196
docker logs -t nervous_lamarr
docker logs -f nervous_lamarr
  • restart Restart one or more containers
  • -t, --time int Seconds to wait for stop before killing the container (default 10).
docker restart nervous_lamarr
# nervous_lamarr
docker ps -a
# CONTAINER ID    IMAGE    COMMAND              CREATED           STATUS          PORTS                  NAMES
# 89d48b6635c3    httpd    "httpd-foreground"   36 minutes ago    Up 3 seconds    0.0.0.0:8080->80/tcp   nervous_lamarr
# 357e2aafd0d3    httpd    "httpd-foreground"   40 minutes ago    Up 40 minutes   0.0.0.0:80->80/tcp     gallant_lewin
docker restart -t 5 nervous_lamarr
# nervous_lamarr
  • stop Stop one or more running containers.
  • -t, --time int Seconds to wait for stop before killing it (default 10).
docker stop cranky_chatterjee
# cranky_chatterjee
docker ps -a
# CONTAINER ID    IMAGE    COMMAND              CREATED           STATUS                      NAMES
# d16271db5d73    httpd    "httpd-foreground"   17 minutes ago    Exited (0) 3 seconds ago    cranky_chatterjee
docker rm cranky_chatterjee
# cranky_chatterjee
docker stop -t 5 cool_spence
# cool_spence
docker rm cool_spence
# cool_spence
  • kill Kill one or more running containers.
docker kill gracious_jang
# gracious_jang
docker rm gracious_jang
# gracious_jang
  • stats Display a live stream of container(s) resource usage statistics.
  • -a, --all Show all containers (default shows just running).
  • --no-stream Disable streaming stats and only pull the first result.
docker stats nervous_lamarr
# CONTAINER ID    NAME              CPU %    MEM USAGE / LIMIT     MEM %    NET I/O            BLOCK I/O    PIDS
# 89d48b6635c3    nervous_lamarr    0.01%    6.109MiB / 1.943GiB   0.31%    9.29kB / 4.54kB    0B / 0B      82
docker stats -a
# CONTAINER ID    NAME              CPU %    MEM USAGE / LIMIT     MEM %    NET I/O            BLOCK I/O    PIDS
# 89d48b6635c3    nervous_lamarr    0.01%    6.109MiB / 1.943GiB   0.31%    9.29kB / 4.54kB    0B / 0B      82
# 357e2aafd0d3    gallant_lewin     0.02%    5.996MiB / 1.943GiB   0.30%    2.01kB / 558B      0B / 0B      82
docker stats -a --no-stream
  • top Display the running processes of a container
docker top nervous_lamarr
# PID     USER    TIME    COMMAND
# 3634    root    0:00    httpd -DFOREGROUND
# 3668    bin     0:00    httpd -DFOREGROUND
# 3669    bin     0:00    httpd -DFOREGROUND
# 3670    bin     0:00    httpd -DFOREGROUND
  • pause Pause all processes within one or more containers
  • unpause Unpause all processes within one or more containers
docker pause nervous_lamarr
# nervous_lamarr
docker ps -a
# CONTAINER ID    IMAGE    COMMAND              CREATED           STATUS                   PORTS                  NAMES
# 89d48b6635c3    httpd    "httpd-foreground"   36 minutes ago    Up 36 minutes (Paused)   0.0.0.0:8080->80/tcp   nervous_lamarr
# 357e2aafd0d3    httpd    "httpd-foreground"   40 minutes ago    Up 40 minutes            0.0.0.0:80->80/tcp     gallant_lewin
docker unpause nervous_lamarr
# nervous_lamarr
docker ps -a
# CONTAINER ID    IMAGE    COMMAND              CREATED           STATUS          PORTS                  NAMES
# 89d48b6635c3    httpd    "httpd-foreground"   36 minutes ago    Up 36 minutes   0.0.0.0:8080->80/tcp   nervous_lamarr
# 357e2aafd0d3    httpd    "httpd-foreground"   40 minutes ago    Up 40 minutes   0.0.0.0:80->80/tcp     gallant_lewin
  • exec Run a command in a running container.
  • -i, --interactive Keep STDIN open even if not attached.
  • -t, --tty Allocate a pseudo-TTY.
docker exec  nervous_lamarr /bin/ls
docker exec nervous_lamarr /bin/bash
docker ps -a
# CONTAINER ID    IMAGE    COMMAND              CREATED           STATUS          PORTS                  NAMES
# 89d48b6635c3    httpd    "httpd-foreground"   36 minutes ago    Up 36 minutes   0.0.0.0:8080->80/tcp   nervous_lamarr
# 357e2aafd0d3    httpd    "httpd-foreground"   40 minutes ago    Up 40 minutes   0.0.0.0:80->80/tcp     gallant_lewin
docker exec -i nervous_lamarr /bin/bash
docker ps -a
# CONTAINER ID    IMAGE    COMMAND              CREATED           STATUS          PORTS                  NAMES
# 89d48b6635c3    httpd    "httpd-foreground"   36 minutes ago    Up 36 minutes   0.0.0.0:8080->80/tcp   nervous_lamarr
# 357e2aafd0d3    httpd    "httpd-foreground"   40 minutes ago    Up 40 minutes   0.0.0.0:80->80/tcp     gallant_lewin
docker exec -i -t nervous_lamarr /bin/bash
# root@89d48b6635c3:/usr/local/apache2# cat htdocs/index.html
# <html><body><h1>It works!</h1></body></html>
# root@89d48b6635c3:/usr/local/apache2# exit
# exit
docker ps -a
# CONTAINER ID    IMAGE    COMMAND              CREATED           STATUS          PORTS                  NAMES
# 89d48b6635c3    httpd    "httpd-foreground"   36 minutes ago    Up 36 minutes   0.0.0.0:8080->80/tcp   nervous_lamarr
# 357e2aafd0d3    httpd    "httpd-foreground"   40 minutes ago    Up 40 minutes   0.0.0.0:80->80/tcp     gallant_lewin
  • cp Copy files/folders between a container and the local filesystem
docker cp nervous_lamarr:/usr/local/apache2/htdocs/index.html .
vim index.html
docker cp index.html nervous_lamarr:/usr/local/apache2/htdocs/index.html
  • wait Block until one or more containers stop, then print their exit codes.
docker wait nervous_lamarr
# 0
docker stop nervous_lamarr
# nervous_lamarr
  • attach Attach local standard input, output, and error streams to a running container.
docker attach gallant_lewin