docker入门到进阶一
16lz
2022-04-19
虚拟机技术缺点:
1.资源占用十分多。2.冗余步骤多。3.启动很慢。镜像(image):- docker镜像就好比是一个模板,可以通过这个模板来创建容器服务,tomcat镜像==>==>run==>tomcat01容器(提供服务器),通过这个镜像可以创建多个容器(最终服务运行或者项目运行就是在容器中的)。
- Docker利用容器技术,独立运行一个或者一个组应用,通过镜像来创建的。
- 启动,停止,删除,基本命令!
- 仓库就是存放镜像的地方!
- 仓库分为公有仓库和私有仓库!
- Dockert Hub(默认是国外的
- 阿里云....都有容器服务器(配置镜像加速!)
安装:如果之前安装过就先卸载:yum remove docker \docker-client \docker-client-latest \docker-common \docker-latest \docker-latest-logrotate \docker-logrotate \docker-engine然后安装:yum install -y yum-utils使用阿里云设置镜像仓库:yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
更新yum软件包索引:
yum makecache fast安装docker docker-ce 社区 ee 企业版
yum install docker-ce docker-ce-cli containerd.io安装后启动:systemctl start docker查看dockerdocker version运行映像来验证 Docker 引擎是否已正确安装docker run hello-world
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Docker-Client的指令,就会执行这个命令!
镜像命令:docker images查看所有本地主机上的镜像docker search 搜索镜像[root@localhost ~]# docker search mysqlNAMEDESCRIPTIONSTARSOFFICIALAUTOMATEDmysqlMySQL is a widely used, open-source relation…12213[OK]mariadbMariaDB Server is a high performing open sou…4689[OK]mysql/mysql-serverOptimized MySQL Server Docker images. Create…907[OK]perconaPercona Server is a fork of the MySQL relati…570[OK]phpmyadminphpMyAdmin - A web interface for MySQL and M…465[OK]#可选项,通过搜索来过滤--filter=STARS=3000(或者选择更高的收藏)[root@localhost ~]# docker search mysql --filter=STARS=3000NAMEDESCRIPTIONSTARSOFFICIALAUTOMATEDmysqlMySQL is a widely used, open-source relation…12213[OK]mariadbMariaDB Server is a high performing open sou…4689[OK]docker pull 下载镜像 [root@localhost ~]# docker pull mysqlUsing default tag: latestlatest: Pulling from library/mysql15115158dd02: Pull completed733f6778b18: Pull complete1cc7a6c74a04: Pull completec5049403458b: Pull completef360718d6f4e: Pull completeDigest: sha256:0eb33f0094ef5351639d9d9847c963ee9f22f5631cde046babd4ec239aaeaf06Status: Downloaded newer image for mysql:latestdocker.io/library/mysql:latest[root@localhost ~]#指定下载的版本:docker pull mysql:5.7[root@localhost ~]# docker pull mysql:5.75.7: Pulling from library/mysql15115158dd02: Already existsd733f6778b18: Already exists1cc7a6c74a04: Already existsc4364028a805: Already exists82887163f0f6: Already exists097bfae26e7a: Already existse1b044d6a24f: Already existsa924e739fa39: Pull complete6bd08908162d: Pull complete8a3523a22b20: Pull complete26bb314e3485: Pull completeDigest: sha256:5c6f1132190256d1ee63afc3bb383c890e8cb9f547bb1f8f15fecaa2a78e7de0Status: Downloaded newer image for mysql:5.7docker.io/library/mysql:5.7
docker rmi -f 删除镜像删除指定镜像 需要加上 IMAGE ID ,也可以指定多个IMAGE ID进行删除[root@localhost ~]# docker rmi -f 8b94b71dcc1eUntagged: mysql:5.7Untagged: mysql@sha256:5c6f1132190256d1ee63afc3bb383c890e8cb9f547bb1f8f15fecaa2a78e7de0Deleted: sha256:8b94b71dcc1ee6376ac16096e01b8d92ba885e7b9ae560426af2312cc17fe0f7Deleted: sha256:408f836eb7a93bc3d9c70e370d33b9f540a0268d5e62c0b03421e21b23f95db3Deleted: sha256:953a57b56a8704ad086b5c0e04da7359fe953736f806fa4e0ef3c57b0bbe79d2Deleted: sha256:8914c179eb4f282cb4a0dd50a458bd70aa80fc14d1a1aeb819f3a26a0e2ddccaDeleted: sha256:31f2499802115dd72a026fb9ff18f0a161c8bb0447b673915c52299ef27ba35ddocker rmi -f $(docker imager -aq) 递归删除全部容器[root@localhost ~]# docker rmi -f $(docker images -aq)Untagged: mysql:latestUntagged: mysql@sha256:0eb33f0094ef5351639d9d9847c963ee9f22f5631cde046babd4ec239aaeaf06Deleted: sha256:c1558761f285add928a651173d5e903c7bf2cd5d511d0bd6752fb082c41b56a2Deleted: sha256:1672f9ae83223867a389506098073d942b265e1713b5bca850a606c1880911dfDeleted: sha256:40b682fb6532a32ec278912cc85ad940510eae0eb8c3e81370ca203c25684f51Deleted: sha256:2537872e2e84bcf00ce65149e08839856c7d6d0cdcef2b841e7eced02e3f6d24再次查看 全部镜像删除了[root@localhost ~]# docker imagesREPOSITORYTAGIMAGE IDCREATEDSIZE[root@localhost ~]#容器命令说明:我们有了镜像才可以创建容器,Linuxdocker pull centos新建容器并启动新建容器,并进入[root@localhost ~]# docker run -it centos /bin/bash[root@c29252f4d995 /]# ls 查看容器内的centos,基础版本,很多命令都是不完善的binetcliblost+foundmntprocrunsrvtmpvardevhomelib64mediaoptrootsbinsysusr
从容器中退回到主机[root@c29252f4d995 /]# exitexit[root@localhost ~]# ^C[root@localhost ~]# lsanaconda-ks.cfggyq123scriptsa.txtinitial-setup-ks.cfgtemgyqb.txtMusictemgyq1Desktopmysql57-community-release-el7-10.noarch.rpmTemplatesDocumentsPicturestestDownloadsping03.shVideosgyqping05.shgyq1Public[root@localhost ~]#列出所有的运行的容器docker ps 列出当前正在运行的容器 -a 加上-a参数 列出正在运行的容器+带出历史运行时的容器 -n=? #显示最近创建的容器 -q #只显示容器的编号[root@localhost ~]# docker psCONTAINER IDIMAGECOMMANDCREATEDSTATUSPORTSNAMES[root@localhost ~]# docker ps -aCONTAINER IDIMAGECOMMANDCREATEDSTATUSPORTSNAMESc29252f4d995centos"/bin/bash"18 minutes agoExited (130) 2 minutes agoreverent_lewin2066ae3c7a82feb5d9fea6a5"/hello"4 hours agoExited (0) 4 hours agopriceless_davinci[root@localhost ~]#退出容器exit #容器直接停止并推出Ctrl +P+Q #容器不停止退出删除容器docker rm 容器删除指定容器,不能删除正在运行的容器,如果要强制删除 rm -fdocker rm -f $(docker ps -aq)#删除所有的容器docker ps -a -q|xargs docker rm #删除所有的容器启动和停止容器的操作docker start容器ID#启动容器docker restart容器ID#重启容器docker stop 容器ID#强制停止当前容器
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