『现学现忘』Docker命令 — 17、帮助命令

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1、docker version命令

命令：

docker version

，作用是显示显示Docker的版本信息。

# 显示docker的版本信息
[root@192 docker]# docker version
Client: Docker Engine - Community
Version:           20.10.5
API version:       1.41
Go version:        go1.13.15
Git commit:        55c4c88
Built:             Tue Mar  2 20:33:55 2021
OS/Arch:           linux/amd64
Context:           default
Experimental:      true

Server: Docker Engine - Community
Engine:
Version:          20.10.5
API version:      1.41 (minimum version 1.12)
Go version:       go1.13.15
Git commit:       363e9a8
Built:            Tue Mar  2 20:32:17 2021
OS/Arch:          linux/amd64
Experimental:     false
containerd:
Version:          1.4.4
GitCommit:        05f951a3781f4f2c1911b05e61c160e9c30eaa8e
runc:
Version:          1.0.0-rc93
GitCommit:        12644e614e25b05da6fd08a38ffa0cfe1903fdec
docker-init:
Version:          0.19.0
GitCommit:        de40ad0

2、docker info命令

命令：

docker info

，作用是显示Docker的系统信息，比

docker version

显示的信息更加详细，包括镜像和容器的数量。

[root@192 docker]# docker info
Client:  # docker客户端信息
Context:    default
Debug Mode: false
Plugins:  # 插件信息
app: Docker App (Docker Inc., v0.9.1-beta3)
buildx: Build with BuildKit (Docker Inc., v0.5.1-docker)

Server:  # docker服务器端信息
Containers: 1  # 容器数量
Running: 0  # 正在运行的容器数量
Paused: 0  # 暂停的容器数量
Stopped: 1  # 已停止的容器数量
Images: 1  # 镜像数量
Server Version: 20.10.5  # docker服务器版本
Storage Driver: overlay2  # docker存储驱动程序
Backing Filesystem: xfs  # 文件系统
Supports d_type: true
Native Overlay Diff: true
Logging Driver: json-file  # 日志驱动程序
Cgroup Driver: cgroupfs  # Cgroup驱动程序
Cgroup Version: 1  # Cgroup驱动版本
Plugins:  # 插件信息
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive  # Swarm状态
Runtimes: runc io.containerd.runc.v2 io.containerd.runtime.v1.linux  # runtimes信息
Default Runtime: runc  # 默认runtime
Init Binary: docker-init
containerd version: 05f951a3781f4f2c1911b05e61c160e9c30eaa8e
runc version: 12644e614e25b05da6fd08a38ffa0cfe1903fdec
init version: de40ad0
Security Options:  # 安全选项
seccomp
Profile: default
Kernel Version: 3.10.0-1127.el7.x86_64  # linux内核版本
Operating System: CentOS Linux 7 (Core)  # linux操作系统
OSType: linux  # 操作系统类型
Architecture: x86_64
CPUs: 1  # 宿主机CPU数量
Total Memory: 972.3MiB  # 宿主机内存
Name: 192.168.134.129  # 宿主机名称
ID: 3FXQ:IECC:SYGU:OZEZ:JFUM:2N57:WS2M:FUJW:CJAE:ILZT:2NDL:UAAB
Docker Root Dir: /var/lib/docker  # docker根目录
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Registry Mirrors: # 镜像仓库
https://y29l3pxp.mirror.aliyuncs.com/
Live Restore Enabled: false

WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

3、docker --help命令（重点）

Docker的帮助命令：

可以执行

docker --help

，查看Docker的全部命令。

也可以执行

docker 命令 --help

，查看具体命令的使用说明。

示例如下：

[root@192 docker]# docker --help

Usage:  docker [OPTIONS] COMMAND # docker命令的使用方式 ,[]表示可以省略

A self-sufficient runtime for containers

Options: # 选项
--config string      Location of client config files (default "/root/.docker")
-c, --context string     Name of the context to use to connect to the daemon (overrides DOCKER_HOST env var and default context set with "docker context use")
-D, --debug              Enable debug mode
-H, --host list          Daemon socket(s) to connect to
-l, --log-level string   Set the logging level ("debug"|"info"|"warn"|"error"|"fatal") (default "info")
--tls                Use TLS; implied by --tlsverify
--tlscacert string   Trust certs signed only by this CA (default "/root/.docker/ca.pem")
--tlscert string     Path to TLS certificate file (default "/root/.docker/cert.pem")
--tlskey string      Path to TLS key file (default "/root/.docker/key.pem")
--tlsverify          Use TLS and verify the remote
-v, --version            Print version information and quit

Management Commands: # docker管理类命令
app*        Docker App (Docker Inc., v0.9.1-beta3)
builder     Manage builds
buildx*     Build with BuildKit (Docker Inc., v0.5.1-docker)
config      Manage Docker configs
container   Manage containers
context     Manage contexts
image       Manage images
manifest    Manage Docker image manifests and manifest lists
network     Manage networks
node        Manage Swarm nodes
plugin      Manage plugins
secret      Manage Docker secrets
service     Manage services
stack       Manage Docker stacks
swarm       Manage Swarm
system      Manage Docker
trust       Manage trust on Docker images
volume      Manage volumes

Commands:  # docker命令
attach      Attach local standard input, output, and error streams to a running container
build       Build an image from a Dockerfile
commit      Create a new image from a container's changes
cp          Copy files/folders between a container and the local filesystem
create      Create a new container
diff        Inspect changes to files or directories on a container's filesystem
events      Get real time events from the server
exec        Run a command in a running container
export      Export a container's filesystem as a tar archive
history     Show the history of an image
images      List images
import      Import the contents from a tarball to create a filesystem image
info        Display system-wide information
inspect     Return low-level information on Docker objects
kill        Kill one or more running containers
load        Load an image from a tar archive or STDIN
login       Log in to a Docker registry
logout      Log out from a Docker registry
logs        Fetch the logs of a container
pause       Pause all processes within one or more containers
port        List port mappings or a specific mapping for the container
ps          List containers
pull        Pull an image or a repository from a registry
push        Push an image or a repository to a registry
rename      Rename a container
restart     Restart one or more containers
rm          Remove one or more containers
rmi         Remove one or more images
run         Run a command in a new container
save        Save one or more images to a tar archive (streamed to STDOUT by default)
search      Search the Docker Hub for images
start       Start one or more stopped containers
stats       Display a live stream of container(s) resource usage statistics
stop        Stop one or more running containers
tag         Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE
top         Display the running processes of a container
unpause     Unpause all processes within one or more containers
update      Update configuration of one or more containers
version     Show the Docker version information
wait        Block until one or more containers stop, then print their exit codes

Run 'docker COMMAND --help' for more information on a command.

我们也可以在Docker的官方文档中，来查看Docker所有命令的使用方法。

网址：https://docs.docker.com/

在页面中点击

Reference

(参考)。

然后在左侧栏中

Command-line reference —> Docker CLI (docker)

，即可查看Docker的所有命令。

直达地址：https://docs.docker.com/reference/