docker的基础用法

说明：

Docker使用C/S体系的架构，Docker客户端与Docker守护进程通信，Docker守护进程负责构建，运行和分发Docker容器。Docker客户端和守护进程可以在同一个系统上运行，也可以将Docker客户端连接到远程Docker守护进程。Docker客户端和守护进程使用REST API通过unix套接字或网络接口进行通信。

下面是Docker核心组件及元素说明：

Docker Daemon : dockerd，用来监听Docker API的请求和管理Docker对象，比如镜像、容器、网络和Volume。

Docker Client : docker，docker client是我们和Docker进行交互的最主要的方式方法，比如我们可以通过docker run 命令来运行一个容器，然后我们的docker client会把命令发送给上面的Dockerd，主它来负责处理。

Docker Registry : 用来存储Docker镜像的仓库，Docker hub是官方提供的一个公共仓库，而且Docker默认也是从Docker Hub上查找镜像的。当然你也可以很方便的运行一个私有仓库，当我们使用docker pull或者docker run命令时，就会从我们配置的docker镜像仓库中去拉取镜像，使用docker push时，会将我们构建的镜像推送到对应的镜像仓库中。

**Images : ** 镜像，镜像是一个只读模板，带有创建docker容器的说明。一般来说，镜像会基于另外的一些基础镜像构建并加上一些额外的自定义功能。比如你可以构建一个基于centos的镜像，然后在这个基础镜像上面安装一个Nginx应用，这样就可以构建成属于我们自己的镜像了。

**Containers : ** 容器，容器是一个镜像的运行实例。可以使用Docker REST API或者CLI来操作容器。容器的实质是进程，但与直接在宿主机执行的进程不同，容器进行运行于属于自己独立的命名空间。因此容器可以拥有自己的root文件系统、自己的网络配置、自己的进程空间，甚至自己的用户id空间。容器内的进程是运行在一个隔离的环境里，使用起来，就好像在一个独立于宿主的系统下操作一样。这种特性使得容器封装的应用比直接在宿主机运行更多案例。

docker安装

[root@localhost ~]# cat /etc/redhat-release 
CentOS Stream release 8
[root@localhost ~]# yum install -y yum-utils device-mapper-persistent-data lvm2
[root@localhost ~]# yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
[root@localhost ~]# ls /etc/yum.repos.d/
CentOS-Stream-AppStream.repo         CentOS-Stream-Media.repo
CentOS-Stream-BaseOS.repo            CentOS-Stream-PowerTools.repo
CentOS-Stream-Debuginfo.repo         CentOS-Stream-RealTime.repo
CentOS-Stream-Extras.repo            docker-ce.repo
CentOS-Stream-HighAvailability.repo
[root@localhost ~]# sed -i 's+download.docker.com+mirrors.aliyun.com/docker-ce+' /etc/yum.repos.d/docker-ce.repo
[root@localhost ~]# yum makecache
[root@localhost ~]# yum -y install docker-ce
[root@localhost ~]# rpm -qa |grep docker
docker-scan-plugin-0.9.0-3.el8.x86_64
docker-ce-rootless-extras-20.10.11-3.el8.x86_64
docker-ce-20.10.11-3.el8.x86_64
docker-ce-cli-20.10.11-3.el8.x86_64

docker加速

docker-ce的配置文件是/etc/docker/daemon.json，此文件默认不存在，需要我们手动创建并进行配置，而docker的加速就是通过配置此文件来实现的。

docker的加速有多种方式：

docker.cn
中国科技大学加速器
阿里云加速器（需要通过阿里云开发者平台注册登录帐号，免费使用个人私有的加速器：控制台–>左上角"三"–>容器服务–>–>容器镜像服务–>镜像工具–>镜像加速）

root@localhost ~]# systemctl start docker 
[root@localhost ~]# ls /etc/docker/ 
key.json
[root@localhost ~]# cat > /etc/docker/daemon.json <<EOF
> {
>   "registry-mirrors": ["https://wn5c7d7w.mirror.aliyuncs.com"]
> }
> EOF
[root@localhost ~]# systemctl daemon-reload
[root@localhost ~]# systemctl restart docker
[root@localhost ~]# docker version
Client: Docker Engine - Community
 Version:           20.10.11
 API version:       1.41
 Go version:        go1.16.9
 Git commit:        dea9396
 Built:             Thu Nov 18 00:36:58 2021
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

Server: Docker Engine - Community
 Engine:
  Version:          20.10.11
  API version:      1.41 (minimum version 1.12)
  Go version:       go1.16.9
  Git commit:       847da18
  Built:            Thu Nov 18 00:35:20 2021
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.4.12
  GitCommit:        7b11cfaabd73bb80907dd23182b9347b4245eb5d
 runc:
  Version:          1.0.2
  GitCommit:        v1.0.2-0-g52b36a2
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0
[root@localhost ~]# docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  app: Docker App (Docker Inc., v0.9.1-beta3)
  buildx: Build with BuildKit (Docker Inc., v0.6.3-docker)
  scan: Docker Scan (Docker Inc., v0.9.0)

Server:
 Containers: 0
  Running: 0
  Paused: 0
  Stopped: 0
 Images: 0
 Server Version: 20.10.11
 Storage Driver: overlay2
  Backing Filesystem: xfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 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: runc io.containerd.runc.v2 io.containerd.runtime.v1.linux
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 7b11cfaabd73bb80907dd23182b9347b4245eb5d
 runc version: v1.0.2-0-g52b36a2
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 4.18.0-257.el8.x86_64
 Operating System: CentOS Stream 8
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 7.559GiB
 Name: localhost.localdomain
 ID: C64O:HAJ5:K3PW:JNP7:BD5Z:VQUQ:PPM2:H7TN:U47O:NOBU:YBRH:52FV
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Registry Mirrors:
  https://wn5c7d7w.mirror.aliyuncs.com/            # 加速已配置成功
 Live Restore Enabled: false

docker常用操作

命令功能

docker	search Search the Docker Hub for images (在Docker Hub中搜索图像)
docker pull	Pull an image or a repository from a registry (从注册表中拉出映像或存储库)
docker images	List images (图片列表)
docker create	Create a new conntainer (创建一个新的容器)
docker start	Start one or more stopped containers (启动一个或多个停止的容器)
docker run	Run a command in a new container (在新容器中运行命令)
docker attach	Attach to a runninng container (附加到一个运行的容器)
docker ps	List containers (列表容器)
docker logs	Fetch the logs of a container (获取容器的日志)
docker restart	Restart a container (重启一个容器)
docker stop	Stop one or more running containers (停止一个或多个运行中的容器)
docker kill	Kill one or more running containers （杀死一个或多个运行中的容器）
docker rm	Remove onne or more containers （删除一个或多个容器）
docker exec	Run a command in a running container （在运行容器中运行命令）
docker info	Display system-wide information （显示整个系统的信息）
docker inspect	Return low-level information on Docker objects（返回Docker对象的低级信息）

搜索镜像
[root@localhost ~]# docker search httpd
NAME                                    DESCRIPTION                                     STARS     OFFICIAL   AUTOMATED
httpd                                   The Apache HTTP Server Project                  3784      [OK]       
centos/httpd-24-centos7                 Platform for running Apache httpd 2.4 or bui…   40                   
centos/httpd                                                                            34                   [OK]
arm32v7/httpd                           The Apache HTTP Server Project                  10     
......
拉取镜像
[root@localhost ~]# docker pull httpd:latest
latest: Pulling from library/httpd
eff15d958d66: Pull complete 
ba1caf8ba86c: Pull complete 
ab86dc02235d: Pull complete 
0d58b11d2867: Pull complete 
e88da7cb925c: Pull complete 
Digest: sha256:1d71eef54c08435c0be99877c408637f03112dc9f929fba3cccdd15896099b02
Status: Downloaded newer image for httpd:latest
docker.io/library/httpd:latest
查看镜像
[root@localhost ~]# docker images
REPOSITORY   TAG       IMAGE ID       CREATED       SIZE
httpd        latest    ad17c88403e2   12 days ago   143MB
创建容器
[root@localhost ~]# docker create httpd
8596ac176bd95c8f347b48a8c645ec83e49ff63d39b2aca5103e1278103aeadd
查看容器
[root@localhost ~]# docker ps   
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
[root@localhost ~]# docker ps -as  
CONTAINER ID   IMAGE     COMMAND              CREATED              STATUS    PORTS     NAMES               SIZE
8596ac176bd9   httpd     "httpd-foreground"   About a minute ago   Created             pensive_ramanujan   0B (virtual 143MB)
启动容器
[root@localhost ~]# docker start 8596ac176bd9 
8596ac176bd9
[root@localhost ~]# docker ps
CONTAINER ID   IMAGE     COMMAND              CREATED          STATUS          PORTS     NAMES
8596ac176bd9   httpd   "httpd-foreground" 2 minutes ago（启动时间）Up 10 seconds   80/tcp    pensive_ramanujan
[root@localhost ~]# docker kill  8596ac176bd9
8596ac176bd9
[root@localhost ~]# docker ps
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
[root@localhost ~]# docker ps -a
CONTAINER ID   IMAGE     COMMAND              CREATED         STATUS                        PORTS     NAMES
8596ac176bd9   httpd     "httpd-foreground"   6 minutes ago   Exited (137) 19 seconds ago(19秒前关闭)             pensive_ramanujan
在容器中运行命令
[root@localhost ~]# docker run -it httpd /bin/sh
# ls
bin  build  cgi-bin  conf  error  htdocs  icons  include  logs  modules
# ls bin
ab         checkgid   envvars-std   htdbm     httpd       rotatelogs
apachectl  dbmmanage  fcgistarter   htdigest  httxt2dbm   suexec
apxs       envvars    htcacheclean  htpasswd  logresolve
# exit
查看容器信息
[root@localhost ~]# docker inspect 8596ac176bd9
.......
"Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "e6b7de4eb5e67fcbe4cbfe7a6c25d246fd31046933bc2857b3098f2d60302632",
                    "EndpointID": "fffa4341d90b29aaee924ce9d7a833626a30304b6538a2ee59bc70fee766d289",
                    "Gateway": "172.17.0.1",    # 容器网关
                    "IPAddress": "172.17.0.2",   # 容器IP
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:ac:11:00:02",
                    "DriverOpts": null
......
[root@localhost ~]# curl 172.17.0.2
<html><body><h1>It works!</h1></body></html>
[root@localhost ~]# docker logs 8596ac176bd9
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
[Wed Dec 01 12:34:23.688219 2021] [mpm_event:notice] [pid 1:tid 140522495077696] AH00489: Apache/2.4.51 (Unix) configured -- resuming normal operations
[Wed Dec 01 12:34:23.688387 2021] [core:notice] [pid 1:tid 140522495077696] AH00094: Command line: 'httpd -D FOREGROUND'
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
[Wed Dec 01 12:41:54.056676 2021] [mpm_event:notice] [pid 1:tid 140258335927616] AH00489: Apache/2.4.51 (Unix) configured -- resuming normal operations
[Wed Dec 01 12:41:54.056827 2021] [core:notice] [pid 1:tid 140258335927616] AH00094: Command line: 'httpd -D FOREGROUND'
172.17.0.1 - - [01/Dec/2021:12:44:20 +0000] "GET / HTTP/1.1" 200 45
删除容器
[root@localhost ~]# docker stop 8596ac176bd9
8596ac176bd9
[root@localhost ~]# docker rm 8596ac176bd9
8596ac176bd9
[root@localhost ~]# docker ps -a
CONTAINER ID   IMAGE     COMMAND     CREATED         STATUS                     PORTS     NAMES
02d91fba60bd   httpd     "/bin/sh"   6 minutes ago   Exited (0) 5 minutes ago             thirsty_chaplygin
[root@localhost ~]# docker rm $(docker ps -qa)
02d91fba60bd
[root@localhost ~]# docker ps -a
CONTAINER ID   IMAGE     COMMAND   CREATED   STATUS    PORTS     NAMES
[root@localhost ~]# docker create nginx
Unable to find image 'nginx:latest' locally
latest: Pulling from library/nginx
eff15d958d66: Already exists 
1e5351450a59: Pull complete 
2df63e6ce2be: Pull complete 
9171c7ae368c: Pull complete 
020f975acd28: Pull complete 
266f639b35ad: Pull complete 
Digest: sha256:097c3a0913d7e3a5b01b6c685a60c03632fc7a2b50bc8e35bcaa3691d788226e
Status: Downloaded newer image for nginx:latest
be5d5064f88027c22445534736df9f2cb533c9628493d3a72ffdd3f8ff5ddba7
[root@localhost ~]# docker ps -a
CONTAINER ID   IMAGE     COMMAND                  CREATED          STATUS    PORTS     NAMES
be5d5064f880   nginx     "/docker-entrypoint.…"   17 seconds ago   Created             amazing_cohen
[root@localhost ~]# docker start be5d5064f880
be5d5064f880
[root@localhost ~]# docker exec -it be5d5064f880 /bin/bash  # 进入容器，执行命令
root@be5d5064f880:/# ls
bin   dev                  docker-entrypoint.sh  home  lib64  mnt  proc  run   srv  tmp  var
boot  docker-entrypoint.d  etc                   lib   media  opt  root  sbin  sys  usr

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