9.Dockerfile
2023-11-20 本文已影响0人
_FireFly_
初识别Dockerfile
Dockerfile就是用来构建docker镜像的构建文件，命令脚本。先体验一下
通过这个脚本可以生成镜像，镜像是一层一层的，脚本一个个的命令，每个命令都是一层。
创建一个docker-test-volume文件
通过脚本的方式挂载解释
mkdir docker-test-volume
创建一个docker-test-volume文件
FORM centos
VOLUME ["volume01","volume02"] #匿名挂载
CMD echo "----end----"
CMD /bin/bash
创建一个dockerfile01文件，里面写好脚本
以/home/docker-test-volume/dockerfile01目录下的dockerfile01文件脚本生成一个guobaofeng版本的centos1.0的镜像
docker build -f /home/docker-test-volume/dockerfile01 -t guobaofeng/centos:1.0 .
-t：target生成
脚本生成一个guobaofeng版本的centos1.0的镜像
查看是否生成成功
查看docker images 发现生成成功
启动自己写的guobaofeng centos镜像
docker run -it bcb7b9d02259 /bin/bash
启动自己写的guobaofeng centos镜像
查看目录
ls -l
查看目录
这个卷与外部一定有个同步的目录！
在容器内部创建一个container.txt文件
[root@localhost docker-test-volume]# docker run -it bcb7b9d02259 /bin/bash
[root@314b3d3aef6b /]# ls
bin dev etc home lib lib64 lost+found media mnt opt proc root run sbin srv sys tmp usr var volume01 volume02
[root@314b3d3aef6b /]# cd volume01
[root@314b3d3aef6b volume01]# touch container.txt
[root@314b3d3aef6b volume01]# ls
container.txt
[root@314b3d3aef6b volume01]#
在容器内部创建一个container.txt文件
查看guobaofeng centos镜像的容器信息
docker images
docker ps
docker inspect 314b3d3aef6b
查看guobaofeng centos镜像的容器信息
[
{
"Id": "314b3d3aef6bfeb0d02b25f3e0d31d89fcf69d176b964a5b46df1507575c60e7",
"Created": "2023-11-19T09:29:29.850459895Z",
"Path": "/bin/bash",
"Args": [],
"State": {
"Status": "running",
"Running": true,
"Paused": false,
"Restarting": false,
"OOMKilled": false,
"Dead": false,
"Pid": 3583,
"ExitCode": 0,
"Error": "",
"StartedAt": "2023-11-19T09:29:30.08401377Z",
"FinishedAt": "0001-01-01T00:00:00Z"
},
"Image": "sha256:bcb7b9d022595d87e4f374a55119c8e2e4933dd784edc7ca0ca447c4d8abff2f",
"ResolvConfPath": "/var/lib/docker/containers/314b3d3aef6bfeb0d02b25f3e0d31d89fcf69d176b964a5b46df1507575c60e7/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/314b3d3aef6bfeb0d02b25f3e0d31d89fcf69d176b964a5b46df1507575c60e7/hostname",
"HostsPath": "/var/lib/docker/containers/314b3d3aef6bfeb0d02b25f3e0d31d89fcf69d176b964a5b46df1507575c60e7/hosts",
"LogPath": "/var/lib/docker/containers/314b3d3aef6bfeb0d02b25f3e0d31d89fcf69d176b964a5b46df1507575c60e7/314b3d3aef6bfeb0d02b25f3e0d31d89fcf69d176b964a5b46df1507575c60e7-json.log",
"Name": "/mystifying_johnson",
"RestartCount": 0,
"Driver": "overlay2",
"Platform": "linux",
"MountLabel": "",
"ProcessLabel": "",
"AppArmorProfile": "",
"ExecIDs": null,
"HostConfig": {
"Binds": null,
"ContainerIDFile": "",
"LogConfig": {
"Type": "json-file",
"Config": {}
},
"NetworkMode": "default",
"PortBindings": {},
"RestartPolicy": {
"Name": "no",
"MaximumRetryCount": 0
},
"AutoRemove": false,
"VolumeDriver": "",
"VolumesFrom": null,
"ConsoleSize": [
46,
193
],
"CapAdd": null,
"CapDrop": null,
"CgroupnsMode": "host",
"Dns": [],
"DnsOptions": [],
"DnsSearch": [],
"ExtraHosts": null,
"GroupAdd": null,
"IpcMode": "private",
"Cgroup": "",
"Links": null,
"OomScoreAdj": 0,
"PidMode": "",
"Privileged": false,
"PublishAllPorts": false,
"ReadonlyRootfs": false,
"SecurityOpt": null,
"UTSMode": "",
"UsernsMode": "",
"ShmSize": 67108864,
"Runtime": "runc",
"Isolation": "",
"CpuShares": 0,
"Memory": 0,
"NanoCpus": 0,
"CgroupParent": "",
"BlkioWeight": 0,
"BlkioWeightDevice": [],
"BlkioDeviceReadBps": [],
"BlkioDeviceWriteBps": [],
"BlkioDeviceReadIOps": [],
"BlkioDeviceWriteIOps": [],
"CpuPeriod": 0,
"CpuQuota": 0,
"CpuRealtimePeriod": 0,
"CpuRealtimeRuntime": 0,
"CpusetCpus": "",
"CpusetMems": "",
"Devices": [],
"DeviceCgroupRules": null,
"DeviceRequests": null,
"MemoryReservation": 0,
"MemorySwap": 0,
"MemorySwappiness": null,
"OomKillDisable": false,
"PidsLimit": null,
"Ulimits": null,
"CpuCount": 0,
"CpuPercent": 0,
"IOMaximumIOps": 0,
"IOMaximumBandwidth": 0,
"MaskedPaths": [
"/proc/asound",
"/proc/acpi",
"/proc/kcore",
"/proc/keys",
"/proc/latency_stats",
"/proc/timer_list",
"/proc/timer_stats",
"/proc/sched_debug",
"/proc/scsi",
"/sys/firmware",
"/sys/devices/virtual/powercap"
],
"ReadonlyPaths": [
"/proc/bus",
"/proc/fs",
"/proc/irq",
"/proc/sys",
"/proc/sysrq-trigger"
]
},
"GraphDriver": {
"Data": {
"LowerDir": "/var/lib/docker/overlay2/b1ef18a2f5f751ecbd88d439a0aeba59e64ff29cb59cd7e40e6703c018b2703c-init/diff:/var/lib/docker/overlay2/5e980180ea2e6be0c4f4ebaa8e21ef829533f1ae28c06f68c285590ac4de71a7/diff",
"MergedDir": "/var/lib/docker/overlay2/b1ef18a2f5f751ecbd88d439a0aeba59e64ff29cb59cd7e40e6703c018b2703c/merged",
"UpperDir": "/var/lib/docker/overlay2/b1ef18a2f5f751ecbd88d439a0aeba59e64ff29cb59cd7e40e6703c018b2703c/diff",
"WorkDir": "/var/lib/docker/overlay2/b1ef18a2f5f751ecbd88d439a0aeba59e64ff29cb59cd7e40e6703c018b2703c/work"
},
"Name": "overlay2"
},
"Mounts": [
{
"Type": "volume",
"Name": "76ab373b0f94d3c468d221b1a42fb93e5c9974105c2d67cbc5c6def0ddcc5399",
"Source": "/var/lib/docker/volumes/76ab373b0f94d3c468d221b1a42fb93e5c9974105c2d67cbc5c6def0ddcc5399/_data",
"Destination": "volume01",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
},
{
"Type": "volume",
"Name": "78ae6d3cac8d33346a7362abe9f60196aa04699f4edc15f2bd30f0088d8f94d8",
"Source": "/var/lib/docker/volumes/78ae6d3cac8d33346a7362abe9f60196aa04699f4edc15f2bd30f0088d8f94d8/_data",
"Destination": "volume02",
"Driver": "local",
"Mode": "",
"RW": true,
"Propagation": ""
}
],
"Config": {
"Hostname": "314b3d3aef6b",
"Domainname": "",
"User": "",
"AttachStdin": true,
"AttachStdout": true,
"AttachStderr": true,
"Tty": true,
"OpenStdin": true,
"StdinOnce": true,
"Env": [
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
],
"Cmd": [
"/bin/bash"
],
"Image": "bcb7b9d02259",
"Volumes": {
"volume01": {},
"volume02": {}
},
"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"
}
},
"NetworkSettings": {
"Bridge": "",
"SandboxID": "4b8e90015e61fa31b642c180962cac28bf22a728e885a0dc6f7b036397039d26",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {},
"SandboxKey": "/var/run/docker/netns/4b8e90015e61",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "3d3cf87b0ecce44ffd4fe7d3d7723915f5a10c3d2f8ba7723a09b48ae4fd17d3",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.5",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:05",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "d6032c8a10557b37a95ab87aa418a86226166852796e189e4e2880f901955b26",
"EndpointID": "3d3cf87b0ecce44ffd4fe7d3d7723915f5a10c3d2f8ba7723a09b48ae4fd17d3",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.5",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:05",
"DriverOpts": null
}
}
}
}
]
查看volume01和volume02的实际位置
[root@localhost data]# cd /var/lib/docker/volumes/76ab373b0f94d3c468d221b1a42fb93e5c9974105c2d67cbc5c6def0ddcc5399/_data
[root@localhost _data]# ls
container.txt
查看container.txt是否同步成功
结论
DockerFile构建过程
基础知识
1.每个保留关键字（指令）都是必须是大写字母
2.执行从上到下顺序执行
3.#表示注释
4.每一个指令都会创建一个新的镜像层，并提交。
DockerFile构建过程
fockerfile是面向开发的，我们以后要发布项目，做镜像，就需要编写好dockerfile文件，这个文件十分简单。
Docker镜像逐渐成为企业交付的标准，必须要掌握！
步骤：开发，部署，运维。 三部曲 缺一不可。
DockerFile：构建文件，定义了一切的步骤，源代码
DockerImages：通过DockerFile构建生成的镜像，是最终发布和运行的产品。原来是jar包和war包
Docker容器：容器就是镜像运行起来提供服务器。
