本次测试的docker版本是Docker version 18.09.0, build 4d60db4

在以前的版本中，具体哪一个我没有仔细研究，docker的配置路径如下：

• 环境配置文件
  /etc/sysconfig/docker-network
  /etc/sysconfig/docker-storage
  /etc/sysconfig/docker
• unit file
  /usr/lib/systemd/system/docker.service
• docker registry
  /etc/containers/registries.conf

docker-ce的配置文件路径(本次测试)：
/etc/docker/daemon.json
这个文件在最开始的时候没有，需要我们自己创建，后面我应该会专门去学习一下daemon.json这个文件中的可配置项。到时候再把总结分享出来
这次我修改daemon.json，定义一个镜像加速器，国内有很多镜像加速的服务公司，docker-cn, 网易，阿里云，中国科技大学等等。这个配置我之前在之前的文章Centos7自定义docker engine 安装源有提过。
/etc/docker/daemon.json

{
    "registry-mirrors":["https://registry.docker-cn.com"]
}

docker 命令：

1. docker --help 最强的命令，没有之一

Usage:	docker [OPTIONS] COMMAND

A self-sufficient runtime for containers

Options:
      --config string      Location of client config files (default
                           "/root/.docker")
  -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:
  builder     Manage builds
  config      Manage Docker configs
  container   Manage containers
  engine      Manage the docker engine
  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
  trust       Manage trust on Docker images
  volume      Manage volumes

Commands:
  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
  deploy      Deploy a new stack or update an existing stack
  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.

在新版本的docker中,docker提供了命令分组

docker version:

Client:
 Version:           18.09.0
 API version:       1.39
 Go version:        go1.10.4
 Git commit:        4d60db4
 Built:             Wed Nov  7 00:48:22 2018
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.0
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.4
  Git commit:       4d60db4
  Built:            Wed Nov  7 00:19:08 2018
  OS/Arch:          linux/amd64
  Experimental:     false

docker info:

Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
Images: 0
Server Version: 18.09.0
Storage Driver: overlay2
 Backing Filesystem: xfs
 Supports d_type: true
 Native Overlay Diff: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: c4446665cb9c30056f4998ed953e6d4ff22c7c39
runc version: 4fc53a81fb7c994640722ac585fa9ca548971871
init version: fec3683
Security Options:
 seccomp
  Profile: default
Kernel Version: 3.10.0-957.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 1
Total Memory: 991.2MiB
Name: localhost.localdomain
ID: LJZB:MTK4:EQRF:IEWE:NBIJ:T27L:3BIC:DQBY:IQEF:PW3F:BQ2R:MW6O
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
 127.0.0.0/8
Registry Mirrors:
 https://registry.docker-cn.com/
Live Restore Enabled: false
Product License: Community Engine

image

• docker image pull xxx:tag 下载指定的镜像
• docker image ls 列出本地所有镜像文件
• docker image rm 删除指定的镜像

container

• docker container ls = docker ps 显示所有容器
• docker container run 启动一个容器,要注意容器启动时候的启动参数
  栗子: docker container run --name nginx1 -d nginx:1.14-alpine
• docker inspect nginx1 获取nginx1运行时的信息
• docker create 创建一个新的容器
• docker exec
  
• docker attach 连接到某个容器
• docker logs 获取container的日志
• docker restart 重起容器
• docker stop 停止容器
• docker kill 杀掉一个容器
• docker rm 删除一个容器

docker 状态