Linux-Docker镜像-基础操作命令
Docker镜像
Docker镜像还有启动容器所需要的文件系统及所需要的内容，因此镜像主要用于创建并启动docker容器。
Docker镜像含里面时一层层文件系统，叫做Union File System(Union FS 关联文件系统)
联合文件系统可以将多个目录挂载到一起从而形成一整个虚拟文件系统，该虚拟文件系统的目录结构就想普通Linux的目录结构一样，docker通过这些文件再加上宿主机的内核提供了一个Linux的虚拟环境，每一层文件系统叫做一层layer，联合文件系统可以对每一层文件系统设置三种权限，只读（readonly），读写（readwrite）和写出（whiteout-able），但是docker镜像中每一层文件系统都是只读的，构建镜像的时候，从一个最基本的操作系统开始，每个构建的操作都相当于做一层的修改，增加了一层文件系统，一层层往上叠加，上层的修改会覆盖底层该位置的可见性。
就像上层把底层遮住了 一样，当使用镜像的时候，我们只会看到一个完全的整体，不知道里面有几层也不需要知道里面有几层
搜索镜像：
在官方的docker仓库中搜索指定名称的docker镜像，也会有很多镜像。
docker search +镜像名称+加版本号
[root@centos7-liyj ~]#docker search centos NAME DESCRIPTION STARS centos The official build of CentOS. 7265 kasmweb/centos-7-desktop CentOS 7 desktop for Kasm Workspaces 23 continuumio/centos5_gcc5_base 3 dokken/centos-7 CentOS 7 image for kitchen-dokken 3 dokken/centos-stream-9 1 dokken/centos-stream-8 1 couchbase/centos7-systemd centos7-systemd images with additional debug… 1 spack/centos7 CentOS 7 with Spack preinstalled 1 datadog/centos-i386 0 dokken/centos-6 CentOS 6 image for kitchen-dokken 0 spack/centos6 CentOS 6 with Spack preinstalled 0 ustclug/centos Official CentOS Image with USTC Mirror 0 dokken/centos-8 CentOS 8 image for kitchen-dokken 0 corpusops/centos-bare https://github.com/corpusops/docker-images/ 0 bitnami/centos-extras-base 0 corpusops/centos centos corpusops baseimage 0 couchbase/centos-72-java-sdk 0 couchbase/centos-72-jenkins-core 0 bitnami/centos-base-buildpack Centos base compilation image 0 couchbase/centos-69-sdk-nodevtoolset-build 0 fnndsc/centos-python3 Source for a slim Centos-based Python3 image… 0 couchbase/centos-69-sdk-build 0 couchbase/centos-70-sdk-build 0 dokken/centos-5 EOL DISTRO: For use with kitchen-dokken, Bas… 0 spack/centos-stream 0 [root@centos7-liyj ~]#docker search nginx NAME DESCRIPTION STARS nginx Official build of Nginx. 17183 linuxserver/nginx An Nginx container, brought to you by LinuxS… 173 bitnami/nginx Bitnami nginx Docker Image 137 ubuntu/nginx Nginx, a high-performance reverse proxy & we… 55 bitnami/nginx-ingress-controller Bitnami Docker Image for NGINX Ingress Contr… 19 rancher/nginx-ingress-controller 10 ibmcom/nginx-ingress-controller Docker Image for IBM Cloud Private-CE (Commu… 4 clearlinux/nginx Nginx reverse proxy server with the benefits… 4 bitnami/nginx-ldap-auth-daemon 3 kasmweb/nginx An Nginx image based off nginx:alpine and in… 2 bitnami/nginx-exporter 2 rapidfort/nginx RapidFort optimized, hardened image for NGINX 2 rancher/nginx-ingress-controller-defaultbackend 2 vmware/nginx 2 rancher/nginx 2 bitnami/nginx-intel 1 vmware/nginx-photon 1 wallarm/nginx-ingress-controller Kubernetes Ingress Controller with Wallarm e… 1 ibmcom/nginx-ingress-controller-ppc64le Docker Image for IBM Cloud Private-CE (Commu… 0 rancher/nginx-conf 0 rapidfort/nginx-ib RapidFort optimized, hardened image for NGIN… 0 rancher/nginx-ssl 0 ibmcom/nginx-ppc64le Docker image for nginx-ppc64le 0 continuumio/nginx-ingress-ws 0 rancher/nginx-ingress-controller-amd64 0
下载镜像：
从docker仓库将镜像下载到本地，命令格式如下：
docker pull 仓库服务端：端口/项目名称/镜像名称：tag（版本）号
现在nginx镜像
[17:14:59 root@ubuntu-lyj ~]#docker pull nginx Using default tag: latest latest: Pulling from library/nginx 1efc276f4ff9: Downloading [====================> ] 13.04MB/31.37MB baf2da91597d: Downloading [===================================> ] 17.78MB/25.35MB 05396a986fd3: Download complete 6a17c8e7063d: Waiting 27e0d286aeab: Waiting b1349eea8fc5: Waiting
下载完成
[17:14:59 root@ubuntu-lyj ~]#docker pull nginx Using default tag: latest latest: Pulling from library/nginx 1efc276f4ff9: Pull complete baf2da91597d: Pull complete 05396a986fd3: Pull complete 6a17c8e7063d: Pull complete 27e0d286aeab: Pull complete b1349eea8fc5: Pull complete Digest: sha256:fd304ffea0c92df362f25021faf126d8307f52f352fe7635b7713e740388a3d7 Status: Downloaded newer image for nginx:latest
查看本地镜像：
下载完成的镜像比下载的大，因为下载完成后会解压
[17:17:31 root@ubuntu-lyj ~]#docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest b692a91e4e15 4 hours ago 142MB
- REPOSITORY 镜像所属的仓库名称
- TAG 镜像版本号（标识符），默认为latest
- IMAGE ID 镜像唯一ID标识
- CREATED 镜像创建时间
- SIZE 镜像的大小
镜像导出：
可以将镜像从本地导出为一个压缩文件，然后复制到其他服务器进行导入使用
导出方法1：
[17:17:37 root@ubuntu-lyj ~]#docker save nginx -o /data/nginx.tar.gz [17:23:52 root@ubuntu-lyj ~]#ll /data/ total 142568 drwxr-xr-x 3 root root 4096 Aug 2 17:23 ./ drwxr-xr-x 24 root root 4096 Apr 4 22:23 ../ drwx------ 2 root root 16384 Apr 4 22:16 lost+found/ -rw------- 1 root root 145963520 Aug 2 17:23 nginx.tar.gz
导出方法2：
[17:24:02 root@ubuntu-lyj ~]#docker save nginx > /data/nginx1.tar.gz [17:24:57 root@ubuntu-lyj ~]#ll /data/ total 285112 drwxr-xr-x 3 root root 4096 Aug 2 17:24 ./ drwxr-xr-x 24 root root 4096 Apr 4 22:23 ../ drwx------ 2 root root 16384 Apr 4 22:16 lost+found/ -rw-r--r-- 1 root root 145963520 Aug 2 17:24 nginx1.tar.gz -rw------- 1 root root 145963520 Aug 2 17:23 nginx.tar.gz
查看镜像内容
[17:25:35 root@ubuntu-lyj /data]#tar xvf nginx.tar.gz 0b71b9002c2056073a621264c914f1778296599761548ff1e34d39dc883ed029/ 0b71b9002c2056073a621264c914f1778296599761548ff1e34d39dc883ed029/VERSION 0b71b9002c2056073a621264c914f1778296599761548ff1e34d39dc883ed029/json 0b71b9002c2056073a621264c914f1778296599761548ff1e34d39dc883ed029/layer.tar 19dee729285a1f8f34b15874db48c7b4b60f6041914f2cad9b1de169795de836/ 19dee729285a1f8f34b15874db48c7b4b60f6041914f2cad9b1de169795de836/VERSION 19dee729285a1f8f34b15874db48c7b4b60f6041914f2cad9b1de169795de836/json 19dee729285a1f8f34b15874db48c7b4b60f6041914f2cad9b1de169795de836/layer.tar 1c65531519b901e0508c411808f7dc2497a6549926bda748896f59aaddc4eed4/ 1c65531519b901e0508c411808f7dc2497a6549926bda748896f59aaddc4eed4/VERSION 1c65531519b901e0508c411808f7dc2497a6549926bda748896f59aaddc4eed4/json 1c65531519b901e0508c411808f7dc2497a6549926bda748896f59aaddc4eed4/layer.tar 6387aff546d7c159c6e082ea910391bc9c331ff19f75c73d45780def09a8c989/ 6387aff546d7c159c6e082ea910391bc9c331ff19f75c73d45780def09a8c989/VERSION 6387aff546d7c159c6e082ea910391bc9c331ff19f75c73d45780def09a8c989/json 6387aff546d7c159c6e082ea910391bc9c331ff19f75c73d45780def09a8c989/layer.tar 75e6a412e4bda1a8b9e5690c6f8c218c0649ca965207ff15f4f2e114e859ec86/ 75e6a412e4bda1a8b9e5690c6f8c218c0649ca965207ff15f4f2e114e859ec86/VERSION 75e6a412e4bda1a8b9e5690c6f8c218c0649ca965207ff15f4f2e114e859ec86/json 75e6a412e4bda1a8b9e5690c6f8c218c0649ca965207ff15f4f2e114e859ec86/layer.tar b692a91e4e1582db97076184dae0b2f4a7a86b68c4fe6f91affa50ae06369bf5.json e9bee565b6a50b23d35427abf3f6756a842c5d75d3c8e3d63f412cb3dae90409/ e9bee565b6a50b23d35427abf3f6756a842c5d75d3c8e3d63f412cb3dae90409/VERSION e9bee565b6a50b23d35427abf3f6756a842c5d75d3c8e3d63f412cb3dae90409/json e9bee565b6a50b23d35427abf3f6756a842c5d75d3c8e3d63f412cb3dae90409/layer.tar manifest.json repositories [17:25:51 root@ubuntu-lyj /data]#cat manifest.json #包含了镜像的相关配置，配文件，分层 [{"Config":"b692a91e4e1582db97076184dae0b2f4a7a86b68c4fe6f91affa50ae06369bf5.json","RepoTags":["nginx:latest"],"Layers":["1c65531519b901e0508c411808f7dc2497a6549926bda748896f59aaddc4eed4/layer.tar","e9bee565b6a50b23d35427abf3f6756a842c5d75d3c8e3d63f412cb3dae90409/layer.tar","6387aff546d7c159c6e082ea910391bc9c331ff19f75c73d45780def09a8c989/layer.tar","75e6a412e4bda1a8b9e5690c6f8c218c0649ca965207ff15f4f2e114e859ec86/layer.tar","0b71b9002c2056073a621264c914f1778296599761548ff1e34d39dc883ed029/layer.tar","19dee729285a1f8f34b15874db48c7b4b60f6041914f2cad9b1de169795de836/layer.tar"]}] [17:26:09 root@ubuntu-lyj /data]#ll total 285152 drwxr-xr-x 9 root root 4096 Aug 2 17:25 ./ drwxr-xr-x 24 root root 4096 Apr 4 22:23 ../ drwxr-xr-x 2 root root 4096 Aug 2 13:17 0b71b9002c2056073a621264c914f1778296599761548ff1e34d39dc883ed029/ drwxr-xr-x 2 root root 4096 Aug 2 13:17 19dee729285a1f8f34b15874db48c7b4b60f6041914f2cad9b1de169795de836/ drwxr-xr-x 2 root root 4096 Aug 2 13:17 1c65531519b901e0508c411808f7dc2497a6549926bda748896f59aaddc4eed4/ drwxr-xr-x 2 root root 4096 Aug 2 13:17 6387aff546d7c159c6e082ea910391bc9c331ff19f75c73d45780def09a8c989/ drwxr-xr-x 2 root root 4096 Aug 2 13:17 75e6a412e4bda1a8b9e5690c6f8c218c0649ca965207ff15f4f2e114e859ec86/ -rw-r--r-- 1 root root 7653 Aug 2 13:17 b692a91e4e1582db97076184dae0b2f4a7a86b68c4fe6f91affa50ae06369bf5.json drwxr-xr-x 2 root root 4096 Aug 2 13:17 e9bee565b6a50b23d35427abf3f6756a842c5d75d3c8e3d63f412cb3dae90409/ drwx------ 2 root root 16384 Apr 4 22:16 lost+found/ -rw-r--r-- 1 root root 586 Jan 1 1970 manifest.json -rw-r--r-- 1 root root 145963520 Aug 2 17:24 nginx1.tar.gz -rw------- 1 root root 145963520 Aug 2 17:23 nginx.tar.gz -rw-r--r-- 1 root root 88 Jan 1 1970 repositories
分层为了方便文件使用，即相同的文件可以共用
[{"Config":"配置文件.json","RepoTags":["docker.io/nginx:latest"],"Layers":["分层1//layer.tar","分层2/layer.tar","分层3/layer.tar"]}]
镜像导入
复制打包好的镜像到另外一台机器上
[17:33:17 root@ubuntu-lyj /data]#scp /data/nginx.tar.gz 10.0.0.101:/data The authenticity of host '10.0.0.101 (10.0.0.101)' can't be established. ECDSA key fingerprint is SHA256:MTWz5GpZYQgmK+u/UeqLdeE/aCVyc0R7xghEfrJyNiM. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '10.0.0.101' (ECDSA) to the list of known hosts. root@10.0.0.101's password: nginx.tar.gz 100% 139MB 148.0MB/s 00:00 [17:33:29 root@ubuntu-lyj /data]#
导入命令 docker load < /path/to/file
[17:39:21 root@ubuntu-lyj ~]#docker load < /data/nginx.tar.gz 92a4e8a3140f: Loading layer [==================================================>] 83.87MB/83.87MB e3257a399753: Loading layer [==================================================>] 62.04MB/62.04MB 3a89c8160a43: Loading layer [==================================================>] 3.072kB/3.072kB f91d0987b144: Loading layer [==================================================>] 4.096kB/4.096kB bdc7a32279cc: Loading layer [==================================================>] 3.584kB/3.584kB b539cf60d7bb: Loading layer [==================================================>] 7.168kB/7.168kB Loaded image: nginx:latest [17:40:11 root@ubuntu-lyj ~]#docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest b692a91e4e15 4 hours ago 142MB
删除镜像
- docker rmi +镜像名称
[17:33:29 root@ubuntu-lyj /data]#docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest b692a91e4e15 4 hours ago 142MB [17:38:23 root@ubuntu-lyj /data]#docker rmi nginx Untagged: nginx:latest Untagged: nginx@sha256:fd304ffea0c92df362f25021faf126d8307f52f352fe7635b7713e740388a3d7 Deleted: sha256:b692a91e4e1582db97076184dae0b2f4a7a86b68c4fe6f91affa50ae06369bf5 Deleted: sha256:20fe57e949a4f70bf714590d9d5a78d158d12f4619d148619427a86dfc2e5a7a Deleted: sha256:042a89e2d80d230c47e0f2add6e13a5958cf18b039f04a3751200937ef76ba03 Deleted: sha256:9e20f968300754f2d3ace5b726448b9a4249bb8196aded53b36ae8b6d3e8c174 Deleted: sha256:15e9cede496de643a978a58c0b49ef7beea83b368dfefc2e46fa0e8dd589f099 Deleted: sha256:d2850ddb0c4ca9f6289f624b27f987873e556c41250f5c5ed47a69c6c2529e4b Deleted: sha256:92a4e8a3140f7a04a0e5a15793adef2d0e8889ed306a8f95a6cfb67cecb5f212 [17:38:36 root@ubuntu-lyj /data]#docker images REPOSITORY TAG IMAGE ID CREATED SIZE
总结：企业使用镜像及常见操作
搜索、下载、导出、导入、删除
命令总结
#导入本地镜像 docker load -i /data/nginx.tar.gz docker load < /data/nginx.tar.gz #导出镜像 docker save nginx -o /data/nginx.tar.gz docker save nginx > /data/nginx1.tar.gz #删除镜像 docker rmi 镜像ID/镜像名称 #删除指定ID的镜像，通过镜像启动容器的时候镜像不能被删除，除非将容器全部关闭 #删除容器 docker rm 容器ID/容器名称 #强制删除正在运行的容器 docker rm 容器ID/容器名称 -f
容器操作基础命令
命令格式
docker run [选项] [镜像名] [shell 命令] [参数] docker run [参数选项] [镜像名，必须在所有选项的后面] [/bin/echo 'hello wold'] #单次执行，没有自定义容器名称 docker run centos /bin/echo 'hello wold' #启动的容器在执行完shell命令就退出了
[17:51:58 root@ubuntu-lyj /data]#docker run centos /bin/echo 'hello wold' hello wold
从镜像启动一个容器
会直接进入到容器，并随机生成容器ID和名称
退出容器不注销：ctrl+p+q
[17:54:28 root@ubuntu-lyj ~]#docker run -it docker.io/nginx bash root@ba40f1c83a28:/# ll bash: ll: command not found root@ba40f1c83a28:/# [17:55:04 root@ubuntu-lyj ~]#
显示正在运行的容器
- docker ps
- docker ps -a #显示所有容器（正在运行及关闭的所有容器）
[17:56:48 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES ba40f1c83a28 nginx "/docker-entrypoint.…" 2 minutes ago Up 2 minutes 80/tcp tender_euler
删除运行中的容器：
即使正在运行中的容器，也会被相知删除掉
[17:56:59 root@ubuntu-lyj ~]#docker rm -f ba40f1c83a28 ba40f1c83a28 [17:59:18 root@ubuntu-lyj ~]#docker images REPOSITORY TAG IMAGE ID CREATED SIZE nginx latest b692a91e4e15 5 hours ago 142MB [17:59:28 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES [17:59:33 root@ubuntu-lyj ~]#
随机映射端口
- docker pull nginx #下载nginx 镜像
- docker run -P docker.io/nginx #前台启动并随机映射本地端口到容器的80
前台启动的会话窗口无法进行其他操作，除非退出，但是退出后容器也会退出
[18:21:10 root@ubuntu-lyj ~]#docker run -P docker.io/nginx /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 2022/08/02 10:21:23 [notice] 1#1: using the "epoll" event method 2022/08/02 10:21:23 [notice] 1#1: nginx/1.23.1 2022/08/02 10:21:23 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 2022/08/02 10:21:23 [notice] 1#1: OS: Linux 4.15.0-112-generic 2022/08/02 10:21:23 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576 2022/08/02 10:21:23 [notice] 1#1: start worker processes 2022/08/02 10:21:23 [notice] 1#1: start worker process 31 2022/08/02 10:21:23 [notice] 1#1: start worker process 32
随机端口映射，其实是默认从32768开始
本次随机的端口49153
[18:20:27 root@ubuntu-lyj ~]#ss -tnl State Recv-Q Send-Q Local Address:Port Peer Address:Port LISTEN 0 128 127.0.0.53%lo:53 0.0.0.0:* LISTEN 0 128 0.0.0.0:22 0.0.0.0:* LISTEN 0 128 127.0.0.1:6010 0.0.0.0:* LISTEN 0 128 127.0.0.1:6011 0.0.0.0:* LISTEN 0 128 0.0.0.0:49153 0.0.0.0:* LISTEN 0 128 [::]:22 [::]:* LISTEN 0 128 [::1]:6010 [::]:* LISTEN 0 128 [::1]:6011 [::]:* LISTEN 0 128 [::]:49153 [::]:*
指定端口映射
方式1：本地端口81映射到容器80端口： #docker run -p 81:80 --name nginx-test-port1 nginx 方式2：本地IP:本地端口：容器端口 #docker run -p 10.0.0.101:82:80 --name nginx-test-port2 docker.io/nginx 方式3：本地IP:本地随机端口:容器端口 #docker run -p 10.0.0.101::80 --name nginx-test-port3 docker.io/nginx 方式4：本机IP:本地端口:容器端口/协议，默认tcp协议 #docker run -p 10.0.0.101:83:80/udp --name nginx-test-port4 docker.io/nginx 方式5：一次性映射多个端口+协议 #docker run -p 86:80/tcp -p 443:443/tcp -p 53:53/udp --name nginx-test-port5 docker.io/nginx
docker run -d #-d 后台运行
[19:22:45 root@ubuntu-lyj ~]#docker run -d -p 81:80 --name nginx-test-port1 nginx 7cb2a2bbd437848f9eff00addf810f8410228f2b129dd58d178cdab241bb22d6 [19:23:02 root@ubuntu-lyj ~]#docker run -d -p 10.0.0.101:82:80 --name nginx-test-port2 docker.io/nginx 354386106e3dd0ebda748c6ff524de46c571e7ef1067d86c82d30b77ded248dc [19:23:26 root@ubuntu-lyj ~]#docker run -d -p 10.0.0.101::80 --name nginx-test-port3 docker.io/nginx 505cf45a1de2720805a3cd43e9e86235f25d67e5cfc3dfa3d7c29cfa9894383a [19:23:41 root@ubuntu-lyj ~]#docker run -d -p 10.0.0.101:83:80/udp --name nginx-test-port4 docker.io/nginx 973beb9a9810f28a8befff82e749b9b9b63373ccdddd5152180aa6080aab358f [19:29:15 root@ubuntu-lyj ~]#docker run -d -p 86:80/tcp -p 443:443/tcp -p 55:55/udp --name nginx-test-port5 docker.io/nginx 2b0827b23cb904bcdbb74c3347ed99bdfdf7ecc3af666980946270e35f049539
[19:29:42 root@ubuntu-lyj ~]#docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 973beb9a9810 nginx "/docker-entrypoint.…" 7 minutes ago Up 7 minutes 80/tcp, 10.0.0.101:83->80/udp nginx-test-port4 505cf45a1de2 nginx "/docker-entrypoint.…" 7 minutes ago Up 7 minutes 10.0.0.101:49154->80/tcp nginx-test-port3 354386106e3d nginx "/docker-entrypoint.…" 8 minutes ago Up 8 minutes 10.0.0.101:82->80/tcp nginx-test-port2 7cb2a2bbd437 nginx "/docker-entrypoint.…" 8 minutes ago Up 8 minutes 0.0.0.0:81->80/tcp, :::81->80/tcp nginx-test-port1
2b0827b23cb9 nginx "/docker-entrypoint.…" About a minute ago Up About a minute 0.0.0.0:55->55/udp, :::55->55/udp, 0.0.0.0:443->443/tcp, :::443->443/tcp, 0.0.0.0:86->80/tcp, :::86->80/tcp nginx-test-port5
查看nginx容器访问日志：
[19:32:50 root@ubuntu-lyj ~]#docker logs nginx-test-port4 #一次性查看 [19:35:15 root@ubuntu-lyj ~]#docker logs -f nginx-test-port4 #持续性查看 /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 2022/08/02 11:23:57 [notice] 1#1: using the "epoll" event method 2022/08/02 11:23:57 [notice] 1#1: nginx/1.23.1 2022/08/02 11:23:57 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 2022/08/02 11:23:57 [notice] 1#1: OS: Linux 4.15.0-112-generic 2022/08/02 11:23:57 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576 2022/08/02 11:23:57 [notice] 1#1: start worker processes 2022/08/02 11:23:57 [notice] 1#1: start worker process 31 2022/08/02 11:23:57 [notice] 1#1: start worker process 32
查看容器已经映射的端口：
[19:31:21 root@ubuntu-lyj ~]#docker port nginx-test-port5 55/udp -> 0.0.0.0:55 55/udp -> :::55 80/tcp -> 0.0.0.0:86 80/tcp -> :::86 443/tcp -> 0.0.0.0:443 443/tcp -> :::443
自定义容器名称
[19:29:34 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES ee3aed9830f3 nginx "/docker-entrypoint.…" 10 seconds ago Up 9 seconds 80/tcp nginx-test
创建并进入容器：
[20:14:55 root@ubuntu-lyj ~]#docker run -it --name test-centos docker.io/centos /bin/bash [root@c98e857dd515 /]# ps -aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1 0.1 0.1 12048 3320 pts/0 Ss 12:15 0:00 /bin/bash root 14 0.0 0.1 47584 3484 pts/0 R+ 12:15 0:00 ps -aux [root@c98e857dd515 /]# ll bash: ll: command not found [root@c98e857dd515 /]# ls bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var [root@c98e857dd515 /]#
[root@c98e857dd515 /]# exit
exit
[20:17:01 root@ubuntu-lyj ~]#
#退出 exit，执行exit命令退出后容器关闭
单词运行：
容器推出后自动删除
[20:19:08 root@ubuntu-lyj ~]#docker ps -a #容器运行和已经停止的为空 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES [20:20:03 root@ubuntu-lyj ~]#docker run -it --rm --name nginx-delete-test docker.io/nginx #推出后自动删除 /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 2022/08/02 12:20:39 [notice] 1#1: using the "epoll" event method 2022/08/02 12:20:39 [notice] 1#1: nginx/1.23.1 2022/08/02 12:20:39 [notice] 1#1: built by gcc 10.2.1 20210110 (Debian 10.2.1-6) 2022/08/02 12:20:39 [notice] 1#1: OS: Linux 4.15.0-112-generic 2022/08/02 12:20:39 [notice] 1#1: getrlimit(RLIMIT_NOFILE): 1048576:1048576 2022/08/02 12:20:39 [notice] 1#1: start worker processes 2022/08/02 12:20:39 [notice] 1#1: start worker process 30 2022/08/02 12:20:39 [notice] 1#1: start worker process 31 ^C2022/08/02 12:20:45 [notice] 1#1: signal 2 (SIGINT) received, exiting 2022/08/02 12:20:45 [notice] 31#31: signal 2 (SIGINT) received, exiting 2022/08/02 12:20:45 [notice] 31#31: exiting 2022/08/02 12:20:45 [notice] 30#30: signal 2 (SIGINT) received, exiting 2022/08/02 12:20:45 [notice] 30#30: exiting 2022/08/02 12:20:45 [notice] 31#31: exit 2022/08/02 12:20:45 [notice] 30#30: exit 2022/08/02 12:20:45 [notice] 1#1: signal 17 (SIGCHLD) received from 30 2022/08/02 12:20:45 [notice] 1#1: worker process 30 exited with code 0 2022/08/02 12:20:45 [notice] 1#1: worker process 31 exited with code 0 2022/08/02 12:20:45 [notice] 1#1: exit [20:20:45 root@ubuntu-lyj ~]#docker ps -a #已经自动删除，没有记录 CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
传递运行命令
容器需要有一个前台运行的进程才能保持容器的运行，通过传递运行参数是一种方式，另外也可以在构建镜像的时候指定容器启动时运行的前台命令。
[20:25:16 root@ubuntu-lyj ~]#docker run -d centos /usr/bin/tail -f 'etc/hosts' e73b551fafbfb72c634ee3f9df3d71266cd2343c8f4ce2c4d18842142c72b246 [20:25:48 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e73b551fafbf centos "/usr/bin/tail -f et…" 5 seconds ago Up 4 seconds relaxed_gould
容器的启动和关闭：
[20:26:54 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e73b551fafbf centos "/usr/bin/tail -f et…" About a minute ago Up About a minute relaxed_gould [20:27:33 root@ubuntu-lyj ~]#docker stop e73b551fafbf #停止 e73b551fafbf [20:27:58 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES [20:28:00 root@ubuntu-lyj ~]#docker start e73b551fafbf #启动 e73b551fafbf [20:28:06 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES e73b551fafbf centos "/usr/bin/tail -f et…" 2 minutes ago Up 1 second relaxed_gould [20:28:08 root@ubuntu-lyj ~]#
进入到正在运行的容器：
使用attach命令
使用方式docker attach 容器名， attch类似于vnc，操作会在各个容器界面显示，所有使用此方式进入容器的操作都是同步显示的且exit后容器将被关闭，且使用exit推出后容器关闭，不推荐使用
需要进入到有shell环境的容器
[10:22:49 root@ubuntu-lyj ~]#docker run -d -it --name centos-test docker.io/centos [10:24:53 root@ubuntu-lyj ~]#docker attach 9642120ae4aa [root@9642120ae4aa /]# ls bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var [root@9642120ae4aa /]# pwd /
没有shell环境的容器
[10:21:29 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 8e63d78e5a33 nginx "/docker-entrypoint.…" 6 minutes ago Up 5 seconds 0.0.0.0:81->80/tcp, :::81->80/tcp nginx-test-port1 [10:21:34 root@ubuntu-lyj ~]#docker attach 8e63d78e5a33 #docker attach DockerID
在另外一个窗口启动测试页面是否同步
使用exec命令
执行单词命令与进入容器，通常使用此命令，虽然exit退出容器还在运行
[10:34:46 root@ubuntu-lyj ~]#docker exec -it centos-test "docker exec" requires at least 2 arguments. See 'docker exec --help'. Usage: docker exec [OPTIONS] CONTAINER COMMAND [ARG...] Run a command in a running container [10:35:15 root@ubuntu-lyj ~]#docker exec -it centos-test /bin/bash #docker exec -it 容器自定义名称 /bin/bash [root@9642120ae4aa /]# ls bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var [root@9642120ae4aa /]# exit exit [10:35:28 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 9642120ae4aa centos "/bin/bash" 12 minutes ago Up 3 minutes centos-test 8e63d78e5a33 nginx "/docker-entrypoint.…" 21 minutes ago Up 12 minutes 0.0.0.0:81->80/tcp, :::81->80/tcp nginx-test-port1
使用nsenter命令：
推荐使用此方式，nsenter命令需要通过PID进入容器内部，不过可以使用 docker inspect 获取到容器的PID
[10:41:19 root@ubuntu-lyj ~]#apt install util-linux
docker inspect 镜像名称或DockerID
[12:02:34 root@ubuntu-lyj ~]#docker inspect centos [ { "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, "VirtualSize": 231268856, "GraphDriver": { "Data": { "MergedDir": "/var/lib/docker/overlay2/9ebbe4a7c8840cc811532096a26c92def8e4cd76826e231d0cfb44365bc244c2/merged", "UpperDir": "/var/lib/docker/overlay2/9ebbe4a7c8840cc811532096a26c92def8e4cd76826e231d0cfb44365bc244c2/diff", "WorkDir": "/var/lib/docker/overlay2/9ebbe4a7c8840cc811532096a26c92def8e4cd76826e231d0cfb44365bc244c2/work" }, "Name": "overlay2" }, "RootFS": { "Type": "layers", "Layers": [ "sha256:74ddd0ec08fa43d09f32636ba91a0a3053b02cb4627c35051aff89f853606b59" ] }, "Metadata": { "LastTagTime": "0001-01-01T00:00:00Z" } } ]
取某个docker容器的PID
docker inspect -f "{{.State.Pid}}" 容器自定义名称或DockeID
[13:30:54 root@ubuntu-lyj ~]#docker inspect -f "{{.State.Pid}}" 8e63d78e5a33 3298 [13:31:12 root@ubuntu-lyj ~]#docker inspect -f "{{.State.Pid}}" nginx-test-port1 3298
进入容器
[13:31:23 root@ubuntu-lyj ~]#nsenter -t 3298 -m -u -i -n -p root@8e63d78e5a33:/# 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 root@8e63d78e5a33:/#
nsenter命令，需要先取docker容器的PID，才能进入容器，操作繁琐，写成脚本进行调用
脚本方式
[13:35:08 root@ubuntu-lyj ~]#vim docker-in.sh [13:38:03 root@ubuntu-lyj ~]#chmod a+x docker-in.sh [13:38:17 root@ubuntu-lyj ~]#./docker-in.sh nginx-test-port1 root@ubuntu-lyj:/# root@ubuntu-lyj:/# root@ubuntu-lyj:/# root@ubuntu-lyj:/# root@ubuntu-lyj:/# exit logout [13:38:39 root@ubuntu-lyj ~]#cat docker-in.sh
#!/bin/bash docker_in(){ NAME_ID=$1 PID=$(docker inspect -f "{{.State.Pid}}" ${NAME_ID}) nsenter -t ${PID} -m -i -n -p } docker_in $1
查看容器内部的hosts文件：
[13:38:45 root@ubuntu-lyj ~]#./docker-in.sh nginx-test-port1 root@ubuntu-lyj:/# cat /etc/hosts 127.0.0.1 localhost ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters 172.17.0.2 8e63d78e5a33 #默认会将实例的ID添加到自己的hosts文件
批量关闭正在运行的容器：
[13:42:04 root@ubuntu-lyj ~]#docker stop $(docker ps -a -q) 9642120ae4aa 728b689e73f2 8e63d78e5a33 405235c81420 [13:42:22 root@ubuntu-lyj ~]#docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
批量强制关闭正在运行的容器
[13:43:22 root@ubuntu-lyj ~]#docker kill $(docker ps -a -q) 9642120ae4aa 728b689e73f2 8e63d78e5a33
批量删除已退出容器
[13:44:17 root@ubuntu-lyj ~]#docker rm -f `docker ps -aq -f status=exited` 9642120ae4aa 728b689e73f2 8e63d78e5a33 405235c81420
批量删除所有容器
[13:44:48 root@ubuntu-lyj ~]#docker rm -f $(docker ps -a -q)
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