Docker環境確認

docker system infoコマンド実行例

$ sudo docker system info
Client:
 Context:    default
 Debug Mode: false

Server:
 Containers: 0　　←コンテナの数
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 20.10.14　　←dockerのバージョン
 Storage Driver: overlay2　　←ストレージドライバーの種類
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 3df54a852345ae12XXXXXXXXXXXX
 runc version: 
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.15.0-40-generic
 Operating System: Ubuntu Core 18
 OSType: linux　　　←OSの種類
 Architecture: x86_64　　←アーキテクチャ
 CPUs: 4
 Total Memory: 15.55GiB
 Name: XXXXXXXX
 ID: XXXXXXXX
 Docker Root Dir: /var/snap/docker/common/var-lib-docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

docker system df (docker system df -v) コマンド実行例

$ sudo docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          1         1         231.3MB   0B (0%)
Containers      4         1         272B      11B (4%)
Local Volumes   0         0         0B        0B
Build Cache     0         0         0B        0B

#詳細表示オプション-v付与
$ sudo docker system df -v
Images space usage:

REPOSITORY   TAG       IMAGE ID       CREATED         SIZE      SHARED SIZE   UNIQUE SIZE   CONTAINERS
centos       latest    5d0da3dc9764   10 months ago   231.3MB   0B            231.3MB       4

Containers space usage:

CONTAINER ID   IMAGE     COMMAND                 LOCAL VOLUMES   SIZE      CREATED        STATUS                      NAMES
11bbc82b2fca   centos    "/bin/ping localhost"   0               11B       25 hours ago   Exited (137) 13 hours ago   sleepy_beaver
1917c7f76a5f   centos    "/bin/bash"             0               261B      35 hours ago   Up 29 seconds               test2
35cb1215e744   centos    "/bin/cal"              0               0B        35 hours ago   Exited (0) 14 hours ago     test1
99671ed077ff   centos    "/bin/bash"             0               0B        35 hours ago   Exited (0) 13 hours ago     sad_wescoff

Local Volumes space usage:

VOLUME NAME   LINKS     SIZE

Build cache usage: 0B

CACHE ID   CACHE TYPE   SIZE      CREATED   LAST USED   USAGE     SHARED