《Docker技术革命：从虚拟机到容器化，全面解析Docker的原理与应用-上篇》（一）+https://developer.aliyun.com/article/1625018
底层原理
Docker是怎么工作的？
Docker是一个Client-Server结构的系统，Docker的守护进程运行在主机上，通过Socket从客户端访问！
DockerServer接收到的Docker-Client的指令
Docker为什么比虚拟机VM快？
- Docker有着比虚拟机更少的抽象层。
- Docker利用的是宿主机的内核，VM需要是Guest OS
总结
新建一个容器的时候，docker不需要像虚拟机一样重新加载一个操作系统内核，避免引导，虚拟机是加载Guest OS，分钟级别的，而Docker是利用宿主机的操作系统，省略了这个复杂的过程，属于秒级！
Docker的常用命令
帮助命令
[root@linghuNodeMaster /]# docker version Client: Docker Engine - Community Version: 25.0.1 API version: 1.44 Go version: go1.21.6 Git commit: 29cf629 Built: Tue Jan 23 23:12:51 2024 OS/Arch: linux/amd64 Context: default Server: Docker Engine - Community Engine: Version: 25.0.1 API version: 1.44 (minimum version 1.24) Go version: go1.21.6 Git commit: 71fa3ab Built: Tue Jan 23 23:11:50 2024 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.6.27 GitCommit: a1496014c916f9e62104b33d1bb5bd03b0858e59 runc: Version: 1.1.11 GitCommit: v1.1.11-0-g4bccb38 docker-init: Version: 0.19.0 GitCommit: de40ad0 [root@linghuNodeMaster /]# docker info Client: Docker Engine - Community Version: 25.0.1 Context: default Debug Mode: false Plugins: buildx: Docker Buildx (Docker Inc.) Version: v0.12.1 Path: /usr/libexec/docker/cli-plugins/docker-buildx compose: Docker Compose (Docker Inc.) Version: v2.24.2 Path: /usr/libexec/docker/cli-plugins/docker-compose Server: Containers: 1 Running: 0 Paused: 0 Stopped: 1 Images: 1 Server Version: 25.0.1 Storage Driver: overlay2 Backing Filesystem: extfs Supports d_type: true Using metacopy: false 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 splunk syslog Swarm: inactive Runtimes: io.containerd.runc.v2 runc Default Runtime: runc Init Binary: docker-init containerd version: a1496014c916f9e62104b33d1bb5bd03b0858e59 runc version: v1.1.11-0-g4bccb38 init version: de40ad0 Security Options: seccomp Profile: builtin Kernel Version: 3.10.0-957.el7.x86_64 Operating System: CentOS Linux 7 (Core) OSType: linux Architecture: x86_64 CPUs: 2 Total Memory: 1.777GiB Name: linghuNodeMaster ID: 55e66820-5e29-47c4-86f7-f6ebd29be070 Docker Root Dir: /var/lib/docker Debug Mode: false Experimental: false Insecure Registries: 127.0.0.0/8 Registry Mirrors: https://kjrexsxz.mirror.aliyuncs.com/ Live Restore Enabled: false [root@linghuNodeMaster /]# docker --help Usage: docker [OPTIONS] COMMAND A self-sufficient runtime for containers Common Commands: run Create and run a new container from an image exec Execute a command in a running container ps List containers build Build an image from a Dockerfile pull Download an image from a registry push Upload an image to a registry images List images login Log in to a registry logout Log out from a registry search Search Docker Hub for images version Show the Docker version information info Display system-wide information Management Commands: builder Manage builds buildx* Docker Buildx (Docker Inc., v0.12.1) compose* Docker Compose (Docker Inc., v2.24.2) container Manage containers context Manage contexts image Manage images manifest Manage Docker image manifests and manifest lists network Manage networks plugin Manage plugins system Manage Docker trust Manage trust on Docker images volume Manage volumes Swarm Commands: swarm Manage Swarm Commands: attach Attach local standard input, output, and error streams to a running container 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 export Export a container's filesystem as a tar archive history Show the history of an image import Import the contents from a tarball to create a filesystem image 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 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 rename Rename a container restart Restart one or more containers rm Remove one or more containers rmi Remove one or more images save Save one or more images to a tar archive (streamed to STDOUT by default) 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 wait Block until one or more containers stop, then print their exit codes Global Options: --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 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 Run 'docker COMMAND --help' for more information on a command. For more help on how to use Docker, head to https://docs.docker.com/go/guides/ [root@linghuNodeMaster /]#
镜像命令
[root@linghuNodeMaster /]# docker images --help Usage: docker images [OPTIONS] [REPOSITORY[:TAG]] List images Aliases: docker image ls, docker image list, docker 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 Format output using a custom template: 'table': Print output in table format with column headers (default) 'table TEMPLATE': Print output in table format using the given Go template 'json': Print in JSON format 'TEMPLATE': Print output using the given Go template. Refer to https://docs.docker.com/go/formatting/ for more information about formatting output with templates --no-trunc Don't truncate output -q, --quiet Only show image IDs [root@linghuNodeMaster /]#
查看镜像
docker images
[root@linghuNodeMaster /]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE hello-world latest d2c94e258dcb 8 months ago 13.3kB [root@linghuNodeMaster /]#
下载镜像
docker pull mysql
安装mysql的镜像：
删除镜像
docker rmi -f d2c94e258dcb
容器命令
我们有了镜像才可以创建容器，Linux，下载一个centos镜像来测试学习。
docker pull centos
[root@linghuNodeMaster /]# docker run -it centos /bin/bash [root@0d8907f0b945 /]# #从容器中退回主机，容器停止运行 [root@0d8907f0b945 /]# exit exit [root@linghuNodeMaster /]#
退出容器
#从容器中退回主机，容器停止运行
[root@0d8907f0b945 /]# exit
exi
删除容器
docker rm 容器id #不能删除正在运行的容器
docker rm $(docker ps -aq) #可以删除正在运行的容器
启动和停止容器
docker start 容器id # 启动客器 docker restart 容器id # 重启容器 docker stop 容器id ##停止当前正在运行的容器 docker ki11 容器id #强制停止当前容器
[root@linghuNodeMaster /]# docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 0d8907f0b945 centos "/bin/bash" 19 minutes ago Exited (0) 16 minutes ago priceless_jackson 8ff48633ed72 d2c94e258dcb "/hello" 18 hours ago Exited (0) 18 hours ago heuristic_mestorf [root@linghuNodeMaster /]# docker start 0d8907f0b945 0d8907f0b945 [root@linghuNodeMaster /]# docker stop 0d8907f0b945 0d8907f0b945 [root@linghuNodeMaster /]#
常用其他命令
后台启动容器
# 命令 docker run -d 镜像名 [root@iZ2zeg4ytp0whqtmxbsqiiZ /]# docker run -d centos # 问题 docker ps， 发现centos停止了 # 常见的坑， docker 容器使用后台运行， 就必须要有一个前台进程，docker发现没有应用，就会自动停止 # nginx， 容器启动后，发现自己没有提供服务，就会立即停止，就是没有程序了
查看容器中的进程信息
# 命令 docker top 容器id docker top 3218b38490ce
查看镜像中的元数据
# 命令 docker inspect 容器id [root@linghuNodeMaster /]# docker inspect 5d0da3dc9764 [ { "Id": "sha256:5d0da3dc976460b72c77d94c8a1ad043720b0416bfc16c52c45d4847e53fadb6", "RepoTags": [ "centos:latest" ], "RepoDigests": [ "centos@sha256:a27fd8080b517143cbbbab9dfb7c8571c40d67d534bbdee55bd6c473f432b177" ], "Parent": "", "Comment": "", "Created": "2021-09-15T18:20:05.184694267Z", "Container": "9bf8a9e2ddff4c0d76a587c40239679f29c863a967f23abf7a5babb6c2121bf1", "ContainerConfig": { "Hostname": "9bf8a9e2ddff", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "Tty": false, "OpenStdin": false, "StdinOnce": false, "Env": [ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" ], "Cmd": [ "/bin/sh", "-c", "#(nop) ", "CMD [\"/bin/bash\"]" ], "Image": "sha256:f5b050f177fd426be8fe998a8ecf3fb1858d7e26dff4080b29a327d1bd5ba422", "Volumes": null, "WorkingDir": "", "Entrypoint": null, "OnBuild": null, "Labels": { "org.label-schema.build-date": "20210915", "org.label-schema.license": "GPLv2", "org.label-schema.name": "CentOS Base Image", "org.label-schema.schema-version": "1.0", "org.label-schema.vendor": "CentOS" } }, "DockerVersion": "20.10.7", "Author": "", "Config": { "Hostname": "", "Domainname": "", "User": "", "AttachStdin": false, "AttachStdout": false, "AttachStderr": false, "Tty": false, "OpenStdin": false, "StdinOnce": false, "Env": [ "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" ], "Cmd": [ "/bin/bash" ], "Image": "sha256:f5b050f177fd426be8fe998a8ecf3fb1858d7e26dff4080b29a327d1bd5ba422", "Volumes": null, "WorkingDir": "", "Entrypoint": null, "OnBuild": null, "Labels": { "org.label-schema.build-date": "20210915", "org.label-schema.license": "GPLv2", "org.label-schema.name": "CentOS Base Image", "org.label-schema.schema-version": "1.0", "org.label-schema.vendor": "CentOS" } }, "Architecture": "amd64", "Os": "linux", "Size": 231268856, "GraphDriver": { "Data": { "MergedDir": "/var/lib/docker/overlay2/d2748d432c8cb6a180520aaa48050020a595787b70b7f3d8792051603590c611/merged", "UpperDir": "/var/lib/docker/overlay2/d2748d432c8cb6a180520aaa48050020a595787b70b7f3d8792051603590c611/diff", "WorkDir": "/var/lib/docker/overlay2/d2748d432c8cb6a180520aaa48050020a595787b70b7f3d8792051603590c611/work" }, "Name": "overlay2" }, "RootFS": { "Type": "layers", "Layers": [ "sha256:74ddd0ec08fa43d09f32636ba91a0a3053b02cb4627c35051aff89f853606b59" ] }, "Metadata": { "LastTagTime": "0001-01-01T00:00:00Z" } } ] [root@linghuNodeMaster /]#
进入当前正在运行的容器
#我们通常容器都是后台方式进行的，需要进入容器，修改一些配置 #命令 docker exec -it 容器id /bin/bash # 方式二 docker attach 容器id # docker exec # 进入容器后开启一个新的终端，可以在里面操作 # docker attach # 进入容器正在执行的终端，不会启动新的进程
从容器内拷贝到主机上
#1.命令 docker cp 容器id:容器内路径（文件名） 主机目的路径 #2.测试 docker cp 0694e2e1032c:/hello.java /home #将容器内部的/hello.java移动到主机的/home目录下，即使容器关闭了，也可以拷贝出来 #拷贝是一个手动过程，未来我们使用-v卷的技术，可以实现自动同步
总结
attach Attach local standard input, output, and error streams to a running container #当前shell下 attach连接指定运行的镜像 build Build an image from a Dockerfile # 通过Dockerfile定制镜像 commit Create a new image from a container's changes #提交当前容器为新的镜像 cp Copy files/folders between a container and the local filesystem #拷贝文件 create Create a new container #创建一个新的容器 diff Inspect changes to files or directories on a container's filesystem #查看docker容器的变化 events Get real time events from the server # 从服务获取容器实时时间 exec Run a command in a running container # 在运行中的容器上运行命令 export Export a container's filesystem as a tar archive #导出容器文件系统作为一个tar归档文件[对应import] history Show the history of an image # 展示一个镜像形成历史 images List images #列出系统当前的镜像 import Import the contents from a tarball to create a filesystem image #从tar包中导入内容创建一个文件系统镜像 info Display system-wide information # 显示全系统信息 inspect Return low-level information on Docker objects #查看容器详细信息 kill Kill one or more running containers # kill指定docker容器 load Load an image from a tar archive or STDIN #从一个tar包或标准输入中加载一个镜像[对应save] 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
Docker安装Nginx
安装过程：
[root@linghuNodeMaster /]# docker pull nginx #下载拉取nginx Using default tag: latest latest: Pulling from library/nginx a2abf6c4d29d: Pull complete a9edb18cadd1: Pull complete 589b7251471a: Pull complete 186b1aaa4aa6: Pull complete b4df32aa5a72: Pull complete a0bcbecc962e: Pull complete Digest: sha256:0d17b565c37bcbd895e9d92315a05c1c3c9a29f762b011a10c54a66cd53c9b31 Status: Downloaded newer image for nginx:latest docker.io/library/nginx:latest root@linghuNodeMaster /]# docker images 查看docker的镜像文件 REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest 605c77e624dd 2 years ago 141MB mysql latest 3218b38490ce 2 years ago 516MB centos latest 5d0da3dc9764 2 years ago 231MB [root@linghuNodeMaster /]# # -d 后台运行 # --name 给容器命名 # -p 宿主机端口： [root@linghuNodeMaster /]# docker run -d --name nginx01 -p 3344:80 nginx e8868b054eb4b0fff97adb6b19dc9b6fb83d513b87176290e71d1199e01ded2d [root@linghuNodeMaster /]# docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e8868b054eb4 nginx "/docker-entrypoint.…" 57 seconds ago Up 50 seconds 0.0.0.0:3344->80/tcp, :::3344->80/tcp nginx01 [root@linghuNodeMaster /]# curl localhost:3344 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> <style> html { color-scheme: light dark; } body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } </style> </head> <body> <h1>Welcome to nginx!</h1> <p>If you see this page, the nginx web server is successfully installed and working. Further configuration is required.</p> <p>For online documentation and support please refer to <a href="http://nginx.org/">nginx.org</a>.<br/> Commercial support is available at <a href="http://nginx.com/">nginx.com</a>.</p> <p><em>Thank you for using nginx.</em></p> </body> </html> [root@linghuNodeMaster /]#
端口暴露的概念：
外网也可以访问Nginx：
思考问题：我们每次改动nginx配置文件，都要进入容器内部？十分的麻烦，我要是可以在容器外部提供一个映射路径，达到在容器修改文件名，容器内部可以自动修改？
Docker安装Tomcat
# 下载 tomcat9.0 # 命令：docker run -it --rm 镜像名，注意看命令中带有了--rm，表示用完就删除 # 之前的启动都是后台，停止了容器，容器还是可以查到还存在，一般是用来测试，用完就删除 #1. 下载tomcat最新版 docker pull tomcat #2. 查看下载的镜像 docker images #3. 以后台方式，暴露端口方式，启动运行 docker run -d -p 3355:8080 --name tomcat02 tomcat #4. 测试访问有没有问题 curl localhost:3355 #测试没问题，但是外网访问的话是404，这个问题需要下面的第七步解决 #5. 根据容器id进入tomcat容器 docker exec -it 1c9d3fc1dac5 /bin/bash #6. 其实这个tomcat是阉割版 # 发现问题：1、linux命令少了。 2.webapps目录为空 # 原因：阿里云镜像的原因，阿里云默认是最小的镜像，所以不必要的都剔除掉 # 保证最小可运行的环境！ # 解决方案： # 将webapps.dist下的文件都拷贝到webapps下即可 #7. 将webapps.dist下的文件都拷贝到webapps下 #进入容器 [root@iZ2vc28obhvfham8wewhh0Z ~]# docker exec -it 1c9d3fc1dac5 /bin/bash #查看文件目录，含有webapps.dist root@1c9d3fc1dac5:/usr/local/tomcat# ls BUILDING.txt LICENSE README.md RUNNING.txt conf logs temp webapps.dist CONTRIBUTING.md NOTICE RELEASE-NOTES bin lib native-jni-lib webapps work #将webapps.dist所有东西复制到webapps文件夹中 root@1c9d3fc1dac5:/usr/local/tomcat# cp -r webapps.dist/* webapps
Docker镜像原理讲解
镜像是什么
- 镜像是一种轻量级、可执行的独立软件包，用来打包软件运行环境和基于运行环境开发的软件，它包含运行某个软件所需的所有内容，包括代码、运行时库、环境变量和配置文件。
所有应用，直接打包docker镜像，就可以直接跑起来
如何得到镜像
- 从远程仓库下载
- 别人拷贝给你
- 自己制作一个镜像 DockerFile
Docker镜像加载原理
UnionFs （联合文件系统）
Docker镜像加载原理
- 第一阶段：只有bootfs和rootfs
- 第二阶段：bootfs和rootfs部分加上了images
- 第三阶段：bootfs和rootfs部分加上了images，再加上images…无限加层，千层饼
分层理解
查看分层
当我们下载一个镜像的时候，观察输出日志，可以看到在一层层的下载：
为什么Docker要采用这种分层结构？
最大的好处，我觉得莫过于资源共享了！比如有多个镜像都从相同的Base镜像构建而来，那么宿主机只需在磁盘上保留一份base镜像，同时内存中也只需要加载一份base镜像，这样就可以为所有的容器服务了，而且镜像的每一层都可以被共享。
使用docker image inspect tomcat，查看一下分层，主要看一下layers:
[root@iZ2vc28obhvfham8wewhh0Z ~]# docker image inspect tomcat [... "RootFS": { "Type": "layers", "Layers": [#以下的就相当于是一个个的记录，有10条，对应上方的10条pull complete "sha256:688e187d6c79c46e8261890f0010fd5d178b8faa178959b0b46b2635aa1eeff3", "sha256:00bcea93703b384ab61d2344d6e721c75b0e47198b7912136a86759d8d885711", "sha256:ccb9b68523fdb47816f2a15d7590d06ff3d897dfdb3e0733e9c06a2bb79ebfc7", "sha256:685934357c8993799eda4a6d71c2bb2d2c54b1138d6e037f675eeeeffc719f2d", "sha256:3fc095fab4a2bec54616a8f5c20c43a9fe197ad06c2cf81385578dfe79aed238", "sha256:6f770cdc9ebf757c2f2f6395c3cdb6f4298f5860727de340890a9a855e168e6e", "sha256:15786a1cf1cbf50fea509d04227d327416c7c0c8b42b9488b56416095ba2f434", "sha256:8f8b5acac684a1fb664c6301413fd28d50ac0f28c7fb8a01c24eee6cd4799739", "sha256:3307ffa538c1bbc8f7d1cf8a5f0fbcd08634a7001dbf92c619e7720fb334df70", "sha256:daf63ef0ddbb5fd50852b4bfc2f5f9fd0be4923819608d4f6051fc23809985c9" ] }... ]
深入理解
所有Docker镜像都起始于一个基础镜像层，当进行修改或加新的内容时，就会在当前镜像层之上创建新的镜像层。
假如基于 Ubuntu Linux16.04创建一个新的镜像，这就是新镜像的第一层；如果在该镜像中添加 Python包，就会在基础镜像层之上创建第二个镜像层；如果继续添加一个安全补丁，就会创健第三个镜像层该像当前已经包含3个镜像层，如下图所示（这只是一个用于演示的很简单的例子）。
在添加额外的镜像层的同时，镜像始终保持是当前所有镜像的组合，理解这一点
添加额外的镜像层的同时，镜像始终保持是当前所有镜像的组合，理解这一点非常重要。下图中举了一个简单的例子，每个镜像层包含3个文件，而将这两个层进行打包之后，镜像包含了来自两个镜像层的6个文件。
这种情況下，上层镜像层中的文件覆盖了底层镜像层中的文件。这样就使得文件的更新版本作为一个新镜像层添加到镜像当中。
- Docker通过存储引擎（新版本采用快照机制）的方式来实现镜像层堆栈，并保证多镜像层对外展示为统一的文件系统。
- Linux上可用的存储引撃有AUFS、 Overlay2、 Device Mapper、Btrfs以及ZFS。顾名思义，每种存储引擎都基于 Linux中对应的文件系统或者块设备技术，井且每种存储引擎都有其独有的性能特点。
- Docker在 Windows上仅支持 windowsfilter 一种存储引擎，该引擎基于NTFS文件系统之上实现了分层和CoW 。
下图展示了与系统显示相同的三层镜像。所有镜像层堆并合井，对外提供统一的视图。
提交自己的镜像-commit
语法
docker commit 提交容器成为一个新的副本 # 命令和git原理类似 docker commit -m="描述信息" -a="作者名字" 容器id 目标镜像名:[版本TAG] #1. 启动一个默认的tomcat [root@iZ2vc28obhvfham8wewhh0Z ~]# docker run -it -p 8080:8080 tomcat #2. 发现这个默认的tomcat 是没有webapps应用，官方的镜像默认webapps下面是没有文件的！ [root@iZ2vc28obhvfham8wewhh0Z ~]# docker exec -it 079f8174730f /bin/bash #3. 将webapps.dist里的所有东西拷贝文件进webapps，并查看 root@079f8174730f:/usr/local/tomcat# cp -r webapps.dist/* webapps root@079f8174730f:/usr/local/tomcat# cd webapps root@079f8174730f:/usr/local/tomcat/webapps# ls ROOT docs examples host-manager manager #4. 操作过的容器通过commit调教为一个镜像！我们以后就使用我们修改过的镜像即可，而不需要每次都重新拷贝webapps.dist下的文件到webapps了，这就是我们自己的一个修改的镜像。 docker commit -m="描述信息" -a="作者" 容器id 目标镜像名:[TAG] docker commit -a="peng" -m="add webapps app" 容器id tomcat02:1.0 [root@iZ2vc28obhvfham8wewhh0Z ~]# docker commit -a="haha" -m="add webapps app" 079f8174730f tomcat02:1.0 sha256:b0a602f7e277d044ec71dbc36450609a0652f316e06c51fdcc82338de792793e [root@iZ2vc28obhvfham8wewhh0Z ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE #看下方这个tomcat02.1.0就是我们创建的镜像，发布之后再说 tomcat02.1.0 1 b0a602f7e277 About a minute ago 672MB tomcat 9 6654503f1940 7 hours ago 667MB nginx latest d1a364dc548d 4 weeks ago 133MB tomcat latest c43a65faae57 5 weeks ago 667MB mysql latest c0cdc95609f1 6 weeks ago 556MB portainer/portainer latest 580c0e4e98b0 3 months ago 79.1MB hello-world latest d1165f221234 3 months ago 13.3kB centos latest 300e315adb2f 6 months ago 209MB elasticsearch 7.6.2 f29a1ee41030 15 months ago 791MB
