启动、停止、重启

[root@localhost ~]# systemctl start docker

[root@localhost ~]# systemctl restart docker

[root@localhost ~]# systemctl stop docker

Docker 启动进程之后，才能进行容器操作。

# 查看docker命令参数
[root@localhost ~]# docker --help

Usage:	docker COMMAND

A self-sufficient runtime for containers

Options:
      --config string      Location of client config files (default "/root/.docker")
  -D, --debug              Enable debug mode
      --help               Print usage
  -H, --host list          Daemon socket(s) to connect to (default [])
  -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:
  container   Manage containers
  image       Manage images
  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
  volume      Manage volumes

Commands:
  attach      Attach 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 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.

举例常用命令：

run 启动一个新容器的命令

Usage:	docker run [OPTIONS] IMAGE [COMMAND] [ARG...]

Run a command in a new container

#查看更多参数
[root@localhost ~]# docker run --help 

docker run --name some-nginx -v /some/content:/usr/share/nginx/html:ro -d nginx

docker run --name some-nginx -d some-content-nginx

docker run --name some-nginx -d -p 8080:80 some-content-nginx

kill 杀掉一个运行中的容器

[root@localhost ~]# docker kill --help

Usage:	docker kill [OPTIONS] CONTAINER [CONTAINER...]

Kill one or more running containers

Options:
      --help            Print usage
  -s, --signal string   Signal to send to the container (default "KILL")

[root@localhost ~]# docker kill -s KILL 515d0dc31187
515d0dc31187

rm 删除一个或多个容器

[root@localhost ~]# docker rm --help

Usage:	docker rm [OPTIONS] CONTAINER [CONTAINER...]

Remove one or more containers

Options:
  -f, --force     Force the removal of a running container (uses SIGKILL)
      --help      Print usage
  -l, --link      Remove the specified link
  -v, --volumes   Remove the volumes associated with the container

[root@localhost ~]# docker run --name some-nginx -d -p 8080:80 some-content-nginx
3ca143a6d94d1b0d1cf236b5ad05947b9c893d20b64a7d5e35944973d7158512
[root@localhost ~]# docker rm -f 3ca143a6d94
3ca143a6d94

删除所有已经停止的容器（正在运行的容器时无法删除掉的）
[root@localhost ~]# docker rm $(docker ps -a -q)
515d0dc31187

docker pause :暂停容器中所有的进程。docker unpause :恢复容器中所有的进程。

[root@localhost ~]# docker pause --help

Usage:	docker pause CONTAINER [CONTAINER...]

[root@localhost ~]# docker unpause --help

Usage:	docker unpause CONTAINER [CONTAINER...]

Unpause all processes within one or more containers

exec 在运行的容器中执行命令

[root@localhost ~]# docker exec --help

Usage:	docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

Run a command in a running container

Options:
  -d, --detach               Detached mode: run command in the background
      --detach-keys string   Override the key sequence for detaching a container
  -e, --env list             Set environment variables (default [])
      --help                 Print usage
  -i, --interactive          Keep STDIN open even if not attached
      --privileged           Give extended privileges to the command
  -t, --tty                  Allocate a pseudo-TTY
  -u, --user string          Username or UID (format: <name|uid>[:<group|gid>])

ps 列出容器

[root@localhost ~]# docker ps --help

Usage:	docker ps [OPTIONS]

List containers

Options:
  -a, --all             Show all containers (default shows just running)
  -f, --filter filter   Filter output based on conditions provided
      --format string   Pretty-print containers using a Go template
      --help            Print usage
  -n, --last int        Show n last created containers (includes all states) (default -1)
  -l, --latest          Show the latest created container (includes all states)
      --no-trunc        Don't truncate output
  -q, --quiet           Only display numeric IDs
  -s, --size            Display total file sizes
[root@localhost ~]# docker ps -a
CONTAINER ID        IMAGE                COMMAND                  CREATED             STATUS              PORTS                  NAMES
cc7daeccd5c4        some-content-nginx   "/docker-entrypoin..."   15 seconds ago      Up 12 seconds       0.0.0.0:8080->80/tcp   some-nginx

CONTAINER ID：容器的ID
IMAGE：使用的镜像
COMMAND： 启动容器时运行的命令
CREATED：容器创建的时间
STATUS：容器的状态
容器的状态：
created（已创建）
restarting（重启中）
running（运行中）
removing（迁移中）
paused（暂停）
exited（停止）
dead（死亡）
PORTS ：容器的端口信息和使用的链接类型
NAMES：容器的名称

inspect 获取容器/镜像的元数据。

[root@localhost ~]# docker inspect --help

Usage:	docker inspect [OPTIONS] NAME|ID [NAME|ID...]

[root@localhost ~]# docker inspect cc7daeccd5c4

top 查看容器中运行的进程信息，支持 ps 命令参数。

[root@localhost ~]# docker top --help

Usage:	docker top CONTAINER [ps OPTIONS]

Display the running processes of a container

Options:
      --help   Print usage
[root@localhost ~]# docker top cc7daeccd5c4
UID                 PID                 PPID                C                   STIME               TTY                 TIME                CMD
root                22088               22074               0                   15:56               ?                   00:00:00            nginx: master process nginx -g daemon off;
101                 22137               22088               0                   15:56               ?                   00:00:00            nginx: worker process

logs 获取容器的日志

[root@localhost ~]# docker logs --help

Usage:	docker logs [OPTIONS] CONTAINER

Fetch the logs of a container

Options:
      --details        Show extra details provided to logs
  -f, --follow         Follow log output
      --help           Print usage
      --since string   Show logs since timestamp
      --tail string    Number of lines to show from the end of the logs (default "all")
  -t, --timestamps     Show timestamps


[root@localhost ~]# docker logs --details cc7daeccd5c4
 /docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration
 /docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/
 /docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh
 10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf
 10-listen-on-ipv6-by-default.sh: info: Enabled listen on IPv6 in /etc/nginx/conf.d/default.conf
 /docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh
 /docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh
 /docker-entrypoint.sh: Configuration complete; ready for start up
 2022/04/13 07:56:32 [notice] 1#1: using the "epoll" event method
 2022/04/13 07:56:32 [notice] 1#1: nginx/1.21.6
 2022/04/13 07:56:32 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 
 2022/04/13 07:56:32 [notice] 1#1: OS: Linux 3.10.0-693.el7.x86_64
 2022/04/13 07:56:32 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576
 2022/04/13 07:56:32 [notice] 1#1: start worker processes
 2022/04/13 07:56:32 [notice] 1#1: start worker process 30

export 将文件系统作为一个tar归档文件导出到STDOUT。

[root@localhost ~]# docker export --help

Usage:	docker export [OPTIONS] CONTAINER

Export a container's filesystem as a tar archive

Options:
      --help            Print usage
  -o, --output string   Write to a file, instead of STDOUT

[root@localhost ~]# docker export -o nginx2-'date +%Y%m%d'.tar some-nginx
[root@localhost ~]# ll
总用量 140684
-rw-------. 1 root root      1588 12月 21 01:56 anaconda-ks.cfg
-rw-r--r--. 1 root root        61 4月  13 14:05 Dockerfile
-rw-r--r--. 1 root root      1636 12月 21 02:00 initial-setup-ks.cfg
-rw-------. 1 root root 144045568 4月  13 17:39 nginx2-date +%Y%m%d.tar

 port 列出指定的容器的端口映射，或查找将PRIVATE_PORT NAT到面向公众的端口。

[root@localhost ~]# docker port --help

Usage:	docker port CONTAINER [PRIVATE_PORT[/PROTO]]

List port mappings or a specific mapping for the container

Options:
      --help   Print usage

[root@localhost ~]# docker port some-nginx
80/tcp -> 0.0.0.0:8080

commit 从容器创建一个新的镜像。

[root@localhost ~]# docker commit --help

Usage:	docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]

Create a new image from a container's changes

Options:
  -a, --author string    Author (e.g., "John Hannibal Smith <hannibal@a-team.com>")
  -c, --change list      Apply Dockerfile instruction to the created image (default [])
      --help             Print usage
  -m, --message string   Commit message
  -p, --pause            Pause container during commit (default true)

[root@localhost ~]# docker commit -a "huan.xu" -m "nginx-huan.xu" dc59251a5dd7 huan.xu-nginx:v1
sha256:803df802db51eac49475bce7e044169689f417972aa7830cf5d1a8cc773a8722
[root@localhost ~]# docker images
REPOSITORY                       TAG                 IMAGE ID            CREATED             SIZE
huan.xu-nginx                    v1                  803df802db51        11 seconds ago      142 MB

cp 用于容器与主机之间的数据拷贝

[root@localhost ~]# docker cp --help

Usage:	docker cp [OPTIONS] CONTAINER:SRC_PATH DEST_PATH|-
	docker cp [OPTIONS] SRC_PATH|- CONTAINER:DEST_PATH

Copy files/folders between a container and the local filesystem

Options:
  -a, --archive       Archive mode (copy all uid/gid information)
  -L, --follow-link   Always follow symbol link in SRC_PATH
      --help          Print usage

docker cp nginx2.tar dc59251a5dd7:/

[root@localhost ~]# docker exec -it dc59251a5dd7 bash
root@dc59251a5dd7:/# ls
bin  boot  dev	docker-entrypoint.d  docker-entrypoint.sh  etc	home  lib  lib64  media  mnt  nginx2.tar  opt  proc  root  run	sbin  srv  sys	tmp  usr  var

pull 从镜像仓库中拉取或者更新指定镜像

[root@localhost ~]# docker pull --help

Usage:	docker pull [OPTIONS] NAME[:TAG|@DIGEST]

Pull an image or a repository from a registry

Options:
  -a, --all-tags                Download all tagged images in the repository
      --disable-content-trust   Skip image verification (default true)
      --help                    Print usage

push 将本地的镜像上传到镜像仓库,要先登陆到镜像仓库

[root@localhost ~]# docker push --help

Usage:	docker push [OPTIONS] NAME[:TAG]

Push an image or a repository to a registry

Options:
      --disable-content-trust   Skip image verification (default true)
      --help                    Print usage

images 列出本地镜像

[root@localhost ~]# docker images --help

Usage:	docker images [OPTIONS] [REPOSITORY[:TAG]]

List images

Options:
  -a, --all             Show all images (default hides intermediate images)
      --digests         Show digests
  -f, --filter filter   Filter output based on conditions provided
      --format string   Pretty-print images using a Go template
      --help            Print usage
      --no-trunc        Don't truncate output
  -q, --quiet           Only show numeric IDs

rmi 删除本地一个或多少镜像。

[root@localhost ~]# docker rmi --help

Usage:	docker rmi [OPTIONS] IMAGE [IMAGE...]

Remove one or more images

Options:
  -f, --force      Force removal of the image
      --help       Print usage
      --no-prune   Do not delete untagged parents

tag 标记本地镜像，将其归入某一仓库

[root@localhost ~]# docker tag --help

Usage:	docker tag SOURCE_IMAGE[:TAG] TARGET_IMAGE[:TAG]

Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE

Options:
      --help   Print usage

[root@localhost ~]# docker tag 803df802db51 huan.xu-nginx:v1.0.0.1
[root@localhost ~]# docker images
REPOSITORY                       TAG                 IMAGE ID            CREATED             SIZE
huan.xu-nginx                    v1                  803df802db51        23 minutes ago      142 MB
huan.xu-nginx                    v1.0.0.1            803df802db51        23 minutes ago      142 MB

build 命令用于使用 Dockerfile 创建镜像

[root@localhost ~]# docker build --help

Usage:	docker build [OPTIONS] PATH | URL | -

Build an image from a Dockerfile

Options:
      --build-arg list             Set build-time variables (default [])
      --cache-from stringSlice     Images to consider as cache sources
      --cgroup-parent string       Optional parent cgroup for the container
      --compress                   Compress the build context using gzip
      --cpu-period int             Limit the CPU CFS (Completely Fair Scheduler) period
      --cpu-quota int              Limit the CPU CFS (Completely Fair Scheduler) quota
  -c, --cpu-shares int             CPU shares (relative weight)
      --cpuset-cpus string         CPUs in which to allow execution (0-3, 0,1)
      --cpuset-mems string         MEMs in which to allow execution (0-3, 0,1)
      --disable-content-trust      Skip image verification (default true)
  -f, --file string                Name of the Dockerfile (Default is 'PATH/Dockerfile')
      --force-rm                   Always remove intermediate containers
      --help                       Print usage
      --isolation string           Container isolation technology
      --label list                 Set metadata for an image (default [])
  -m, --memory string              Memory limit
      --memory-swap string         Swap limit equal to memory plus swap: '-1' to enable unlimited swap
      --network string             Set the networking mode for the RUN instructions during build (default "default")
      --no-cache                   Do not use cache when building the image
      --pull                       Always attempt to pull a newer version of the image
  -q, --quiet                      Suppress the build output and print image ID on success
      --rm                         Remove intermediate containers after a successful build (default true)
      --security-opt stringSlice   Security options
      --shm-size string            Size of /dev/shm, default value is 64MB
  -t, --tag list                   Name and optionally a tag in the 'name:tag' format (default [])
      --ulimit ulimit              Ulimit options (default [])
  -v, --volume list                Set build-time bind mounts (default [])

中文说明
--build-arg=[] :设置镜像创建时的变量；
--cpu-shares :设置 cpu 使用权重；
--cpu-period :限制 CPU CFS周期；
--cpu-quota :限制 CPU CFS配额；
--cpuset-cpus :指定使用的CPU id；
--cpuset-mems :指定使用的内存 id；
--disable-content-trust :忽略校验，默认开启；
-f :指定要使用的Dockerfile路径；
--force-rm :设置镜像过程中删除中间容器；
--isolation :使用容器隔离技术；
--label=[] :设置镜像使用的元数据；
-m :设置内存最大值；
--memory-swap :设置Swap的最大值为内存+swap，"-1"表示不限swap；
--no-cache :创建镜像的过程不使用缓存；
--pull :尝试去更新镜像的新版本；
--quiet, -q :安静模式，成功后只输出镜像 ID；
--rm :设置镜像成功后删除中间容器；
--shm-size :设置/dev/shm的大小，默认值是64M；
--ulimit :Ulimit配置。
--squash :将 Dockerfile 中所有的操作压缩为一层。
--tag, -t: 镜像的名字及标签，通常 name:tag 或者 name 格式；可以在一次构建中为一个镜像设置多个标签。
--network: 默认 default。在构建期间设置RUN指令的网络模式

history 查看指定镜像的创建历史

[root@localhost ~]# docker history --help

Usage:	docker history [OPTIONS] IMAGE

Show the history of an image

Options:
      --help       Print usage
  -H, --human      Print sizes and dates in human readable format (default true)
      --no-trunc   Don't truncate output
  -q, --quiet      Only show numeric IDs

[root@localhost ~]# docker history some-content-nginx
IMAGE               CREATED             CREATED BY                                      SIZE                COMMENT
0d16c2e700eb        2 weeks ago         /bin/sh -c #(nop) COPY dir:e980de644c1ef00...   0 B                 
12766a6745ee        4 weeks ago         /bin/sh -c #(nop)  CMD ["nginx" "-g" "daem...   0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop)  STOPSIGNAL SIGQUIT           0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop)  EXPOSE 80                    0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop)  ENTRYPOINT ["/docker-en...   0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop) COPY file:09a214a3e07c91...   4.61 kB             
<missing>           4 weeks ago         /bin/sh -c #(nop) COPY file:0fd5fca330dcd6...   1.04 kB             
<missing>           4 weeks ago         /bin/sh -c #(nop) COPY file:0b866ff3fc1ef5...   1.96 kB             
<missing>           4 weeks ago         /bin/sh -c #(nop) COPY file:65504f71f5855c...   1.2 kB              
<missing>           4 weeks ago         /bin/sh -c set -x     && addgroup --system...   61.1 MB             
<missing>           4 weeks ago         /bin/sh -c #(nop)  ENV PKG_RELEASE=1~bullseye   0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop)  ENV NJS_VERSION=0.7.2        0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop)  ENV NGINX_VERSION=1.21.6     0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop)  LABEL maintainer=NGINX ...   0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop)  CMD ["bash"]                 0 B                 
<missing>           4 weeks ago         /bin/sh -c #(nop) ADD file:966d3669b40f5fb...   80.4 MB

save 将指定镜像保存成 tar 归档文件

[root@localhost ~]# docker save --help

Usage:	docker save [OPTIONS] IMAGE [IMAGE...]

Save one or more images to a tar archive (streamed to STDOUT by default)

Options:
      --help            Print usage
  -o, --output string   Write to a file, instead of STDOUT
[root@localhost ~]# docker save -o nginx-new.tar 803df802db51
[root@localhost ~]# ll
总用量 283232
-rw-------. 1 root root      1588 12月 21 01:56 anaconda-ks.cfg
-rw-r--r--. 1 root root        61 4月  13 14:05 Dockerfile
-rw-r--r--. 1 root root      1636 12月 21 02:00 initial-setup-ks.cfg
-rw-------. 1 root root 144045568 4月  13 17:39 nginx2.tar
-rw-------. 1 root root 145967104 5月   1 18:01 nginx-new.tar

load 导入使用 docker save 命令导出的镜像

[root@localhost ~]# docker load --help

Usage:	docker load [OPTIONS]

Load an image from a tar archive or STDIN

Options:
      --help           Print usage
  -i, --input string   Read from tar archive file, instead of STDIN
  -q, --quiet          Suppress the load output

info 显示 Docker 系统信息，包括镜像和容器数

[root@localhost ~]# docker info
Containers: 3
 Running: 1
 Paused: 0
 Stopped: 2
Images: 9
Server Version: 1.13.1
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: journald
Cgroup Driver: systemd
Plugins: 
 Volume: local
 Network: bridge host macvlan null overlay
Swarm: inactive
Runtimes: docker-runc runc
Default Runtime: docker-runc
Init Binary: /usr/libexec/docker/docker-init-current
containerd version:  (expected: aa8187dbd3b7ad67d8e5e3a15115d3eef43a7ed1)
runc version: 66aedde759f33c190954815fb765eedc1d782dd9 (expected: 9df8b306d01f59d3a8029be411de015b7304dd8f)
init version: fec3683b971d9c3ef73f284f176672c44b448662 (expected: 949e6facb77383876aeff8a6944dde66b3089574)
Security Options:
 seccomp
  WARNING: You're not using the default seccomp profile
  Profile: /etc/docker/seccomp.json
 selinux
Kernel Version: 3.10.0-693.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
Number of Docker Hooks: 3
CPUs: 1
Total Memory: 7.501 GiB
Name: localhost.localdomain
ID: 4BVC:4TQ4:J6U6:TLWM:V6Q3:OT4L:C22E:GAIN:FBPB:OLSK:3XKE:NATU
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false
Registries: docker.io (secure)

version 显示 Docker 版本信息。

[root@localhost ~]# docker version --help

Usage:	docker version [OPTIONS]

Show the Docker version information

Options:
  -f, --format string   Format the output using the given Go template
      --help            Print usage

[root@localhost ~]# docker version
Client:
 Version:         1.13.1
 API version:     1.26
 Package version: docker-1.13.1-208.git7d71120.el7_9.x86_64
 Go version:      go1.10.3
 Git commit:      7d71120/1.13.1
 Built:           Mon Jun  7 15:36:09 2021
 OS/Arch:         linux/amd64

Server:
 Version:         1.13.1
 API version:     1.26 (minimum version 1.12)
 Package version: docker-1.13.1-208.git7d71120.el7_9.x86_64
 Go version:      go1.10.3
 Git commit:      7d71120/1.13.1
 Built:           Mon Jun  7 15:36:09 2021
 OS/Arch:         linux/amd64
 Experimental:    false

# docker
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