Docker学习

Centon 8安装 Docker

卸载旧版本
```
yum remove docker
```
安装基本信息
```
yum install -y yum-utils
```

设置镜像仓库

# 不要用官网默认这个！
$ sudo yum-config-manager \
    --add-repo \
    https://download.docker.com/linux/centos/docker-ce.repo # 默认是国外的

# 换成下面的

$ sudo yum-config-manager \
    --add-repo \
    https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo # 阿里云镜像

镜像软件包索引
```
yum makecache fast
```
安装中可能会报 yum makecache: error: argument timer: invalid choice: ‘fast’ (choose from ‘timer’)

这说明centos8没有该参数，解决办法为：去掉fast参数，就可以了
```
yum makecache
```

安装docker引擎
```
yum install docker-ce docker-ce-cli containerd.io # docker-ce 社区版 ee 企业版
```
安装时可能会出现如下问题

Last metadata expiration check: 0:01:06 ago on Sat 05 Dec 2020 03:44:27 PM CST.
Error:
Problem: package docker-ce-3:19.03.14-3.el7.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed
- cannot install the best candidate for the job
- package containerd.io-1.2.10-3.2.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.2.13-3.1.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.2.13-3.2.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.2.2-3.3.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.2.2-3.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.2.4-3.1.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.2.5-3.1.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.2.6-3.3.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.3.7-3.1.el7.x86_64 is filtered out by modular filtering
- package containerd.io-1.3.9-3.1.el7.x86_64 is filtered out by modular filtering
  (try to add '--skip-broken' to skip uninstallable packages or '--nobest' to use not only best candidate packages
安装新版的containerd.i包就可以，安装后在执行 yum install docker-ce docker-ce-cli containerd.io
```
yum update

dnf install https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm

yum install docker-ce docker-ce-cli containerd.io
```
注意这里会有几个个y/n的判断

一路 y 就可以了

要看到Complet再收手！

启动Docker

systemctl start docker # 代表启动成功

查看Docker版本

docker version

Client: Docker Engine - Community
 Version:           19.03.14
 API version:       1.40
 Go version:        go1.13.15
 Git commit:        5eb3275d40
 Built:             Tue Dec  1 19:20:42 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.14
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.15
  Git commit:       5eb3275d40
  Built:            Tue Dec  1 19:19:17 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          1.2.6
  GitCommit:        894b81a4b802e4eb2a91d1ce216b8817763c29fb
 runc:
  Version:          1.0.0-rc8
  GitCommit:        425e105d5a03fabd737a126ad93d62a9eeede87f
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

初次运行 hello

docker run hello-world

中间一堆是签名信息

run的运行流程图

查看下载镜像

docker images

卸载Docker

# 卸载依赖
yum remove docker-ce docker-ce-cli containerd.io

# 删除资源
rm -rf /var/lib/docker # docker 的默认工作路径

阿里云镜像加速

sudo mkdir -p /etc/docker # 创建一个陌路
sudo tee /etc/docker/daemon.json <<-'EOF'
{
  "registry-mirrors": ["https://uyfgafsw.mirror.aliyuncs.com"]
}
EOF # 编写配置文件

sudo systemctl daemon-reload # 重启服务
sudo systemctl restart docker # 重启docker

底层原理

Docker是怎么工作的？

Docker是一个Client-Server结构的系统，Docker的守护进程在主机上。通过Socket从客户端访问！

DockerServer接受到Docker-Client的指令，

Docker为什么比VM快？
1. Docker有着比虚拟机更少的抽象层
2. docker主要用的是宿主机的内核，vm需要Guest OS

所以说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

Docker命令

docker version # 显示docker的基本信息
docker info # 系统信息，镜像和容器的数量
docker 命令 --help # 全部信息

镜像命令

##### 查看所有镜像

docker images

解释

REPOSITORY # 镜像仓库源
TAG # 镜像的标签
IMAGE ID # 镜像的ID
CREATED # 镜像的创建时间
SIZE # 镜像的大小
--all , -a		Show all images (default hides intermediate images) # 显示所有
--digests		Show digests
--filter , -f		Filter output based on conditions provided
--format		Pretty-print images using a Go template
--no-trunc		Don’t truncate output
--quiet , -q		Only show numeric IDs # 只显示id

镜像搜索

docker search mysql

docker search --help  # search帮助文档

docker search --filter=STARS=3000 # 搜索出Stars大于3000的

下载镜像

docker pull mysql   # 下载mysql镜像，default tag，默认最新版latest

[root@ysl ~]# docker pull mysql
Using default tag: latest  # 不写版本号时，默认下载最新的
latest: Pulling from library/mysql
852e50cd189d: Pull complete  #layer 分成下载，docker image的核心，联合文件系统
29969ddb0ffb: Pull complete 
a43f41a44c48: Pull complete 
5cdd802543a3: Pull complete 
b79b040de953: Pull complete 
938c64119969: Pull complete 
7689ec51a0d9: Pull complete 
a880ba7c411f: Pull complete 
984f656ec6ca: Pull complete 
9f497bce458a: Pull complete 
b9940f97694b: Pull complete 
2f069358dc96: Pull complete 
Digest: sha256:4bb2e81a40e9d0d59bd8e3dc2ba5e1f2197696f6de39a91e90798dd27299b093#签名
Status: Downloaded newer image for mysql:latest
docker.io/library/mysql:latest#真实地址


# 即
docker pull mysql
# 等价于
docker pull docker.io/library/mysql:latest

docker pull mysql : 5.7 #指定下载的版本号

删除镜像

# 删除一个 可以通过名称 也可以指定id -f表示删除所有
docker rmi -f 9cfcce23593a
# 删除多个 用空格分隔id
docker rmi -f id id id
# 删除所有 
docker rmi -f $(docker images -aq) # images -aq就是查所有镜像id，从而递归删除

容器命令

说明：有了镜像才能创建容器，linux，下载一个centos镜像来测试学习

新建容器并启动

docker run [可选参数] image

# 参数说明
--name=“Name” # 容器名字，用于区分容器
-d 后台方式运行
-it 使用交互方式运行，进入容器查看内容
-p 指定容器的端口 如-p 8080::8080
	-p ip:主机端口：容器端口
	-p 主机端口:容器端口
	-p 容器端口
	
-p 随机指定端口

进入退出容器

docker run -it centos /bin/bash  # 进入
ls #查看目录
exit # 退出

注意这里面主机名，编程了centos的id

这里面就是一个容器，套娃啊

查看运行的容器

# 查看正在运行的容器
docker ps
# 查看曾经运行的容器
docker ps -a
# 显示最近创建的容器，设置显示个数
docker ps -a - n=? 
# 只显示容器的编号
docker ps -aq

[root@ysl ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@ysl ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
054c11f658bb        centos              "/bin/bash"         5 minutes ago       Exited (0) 5 minutes ago                       blissful_ramanujan
c34be0c5f89a        hello-world         "/hello"            3 hours ago         Exited (0) 3 hours ago                         practical_edison
[root@ysl ~]# docker ps -a -n 2
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
054c11f658bb        centos              "/bin/bash"         5 minutes ago       Exited (0) 5 minutes ago                       blissful_ramanujan
c34be0c5f89a        hello-world         "/hello"            3 hours ago         Exited (0) 3 hours ago                         practical_edison
[root@ysl ~]# docker ps -a -n 1
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                     PORTS               NAMES
054c11f658bb        centos              "/bin/bash"         5 minutes ago       Exited (0) 5 minutes ago                       blissful_ramanujan
[root@ysl ~]# docker ps -aq
054c11f658bb
c34be0c5f89a
[root@ysl ~]#

退出容器

# 容器停止退出
exit
# 容器不停止退出 注意必须在英文输入法下，中文输入法不行
Ctrl + P + Q

删除容器

# 删除指定容器 不能删除正在运行的容器，如果强制删除 rm -f
docker rm 容器id
# 删除所有容器
docker rm -f $(docker ps -aq)
# 删除所有容器
docker ps -a -q|xargs docker rm

[root@ysl ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                      PORTS               NAMES
40e35224b8f8        centos              "/bin/bash"         2 minutes ago       Up 2 minutes                                    sad_liskov
054c11f658bb        centos              "/bin/bash"         11 minutes ago      Exited (0) 11 minutes ago                       blissful_ramanujan
c34be0c5f89a        hello-world         "/hello"            3 hours ago         Exited (0) 3 hours ago                          practical_edison
[root@ysl ~]# docker rm 054c11f658bb
054c11f658bb
[root@ysl ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS                   PORTS               NAMES
40e35224b8f8        centos              "/bin/bash"         2 minutes ago       Up 2 minutes                                 sad_liskov
c34be0c5f89a        hello-world         "/hello"            3 hours ago         Exited (0) 3 hours ago                       practical_edison
[root@ysl ~]# docker ps 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
40e35224b8f8        centos              "/bin/bash"         4 minutes ago       Up 4 minutes                            sad_liskov
[root@ysl ~]# docker rm 40e35224b8f8  # 正在运行的容器无法删除
Error response from daemon: You cannot remove a running container 40e35224b8f8e16274f47cdb6d8c96d5dac4ec9774cc8d2acf1a22e15105a953. Stop the container before attempting removal or force remove
[root@ysl ~]#

启动和停止容器的操作

docker start  #启动
docker restart  #重启
docker stop  #关闭
docker kill

[root@ysl ~]# docker run -it centos /bin/bash
[root@d0ae0f87520f /]# exit
exit
[root@ysl ~]# docker ps 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@ysl ~]# docker ps -a
CONTAINER ID        IMAGE               COMMAND             CREATED              STATUS                      PORTS               NAMES
d0ae0f87520f        centos              "/bin/bash"         About a minute ago   Exited (0) 10 seconds ago                       eloquent_shamir
40e35224b8f8        centos              "/bin/bash"         11 minutes ago       Exited (0) 3 minutes ago                        sad_liskov
c34be0c5f89a        hello-world         "/hello"            3 hours ago          Exited (0) 3 hours ago                          practical_edison
[root@ysl ~]# docker start c34be0c5f89a
c34be0c5f89a
[root@ysl ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@ysl ~]# docker start d0ae0f87520f  # 启动容器
d0ae0f87520f
[root@ysl ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
d0ae0f87520f        centos              "/bin/bash"         2 minutes ago       Up 2 seconds                            eloquent_shamir
[root@ysl ~]# docker stop d0ae0f87520f  # 关闭
d0ae0f87520f
[root@ysl ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@ysl ~]#

常用其他命令

启动、关闭 Docker

systemctl start docker #启动Docker
systemctl stop  docker #关闭Docker

后台启动镜像

docker run -d 镜像名
# 后台运行，docker发现前台没有，容器启动后，发现自己没有提供服务，会立刻停止

[root@ysl ~]# docker run -d centos  #
831447907dacbce9d81d363cdaf946a4e1ab4e07c3ea41a4a8bebcc39f0e85dc
[root@ysl ~]# docker ps # 用docker ps 查看的时候 发现停止了,也就是 -d 可以检测容器中是否有提供的服务，没有的话将自动关闭 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
[root@ysl ~]#

查看日志

docker logs
docker logs -f -t --tail n 【id】# 查看日志，由于没有运行脚本，所以啥也没显示

docker logs --help  # 查看帮助文档

Usage:	docker logs [OPTIONS] CONTAINER

Fetch the logs of a container

Options:
      --details        Show extra details provided to logs
  -f, --follow         Follow log output
      --since string   Show logs since timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)
      --tail string    Number of lines to show from the end of the logs (default "all")
  -t, --timestamps     Show timestamps
      --until string   Show logs before a timestamp (e.g. 2013-01-02T13:23:37) or relative (e.g. 42m for 42 minutes)
#运行centos里面加个脚本
[root@ysl ~]# docker run -d centos /bin/sh -c "while true;do echo 加油;sleep 1;done"
a090835bd80a92c306552ad1e3f8878d30218a3930363a02c7d3dda9fd58dc11
[root@ysl ~]# docker ps
CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS              PORTS               NAMES
a090835bd80a        centos              "/bin/sh -c 'while t…"   37 seconds ago      Up 36 seconds                           mystifying_knuth
a1a1ec80a208        centos              "/bin/bash"              4 minutes ago       Up 4 minutes                            charming_ride
[root@ysl ~]# docker logs -f -t --tail 10 a090835bd80a  # 查看日志 发现隔一秒打印一条
2020-12-06T11:06:27.430555293Z 加油
2020-12-06T11:06:28.432140658Z 加油
2020-12-06T11:06:29.433564252Z 加油
2020-12-06T11:06:30.435042497Z 加油
2020-12-06T11:06:31.436566532Z 加油
2020-12-06T11:06:32.438258329Z 加油
2020-12-06T11:06:33.439975118Z 加油
2020-12-06T11:06:34.441652220Z 加油
2020-12-06T11:06:35.443275405Z 加油

查看正在运行容器的完整信息

docker inspect 容器名

[root@ysl ~]# docker inspect a090835bd80a
[
    {
		#完整id    
        "Id": "a090835bd80a92c306552ad1e3f8878d30218a3930363a02c7d3dda9fd58dc11",
        #创建时间
        "Created": "2020-12-06T11:05:28.871924563Z",
       #脚本位置
       "Path": "/bin/sh",
        #运行的脚本
        "Args": [
            "-c",
            "while true;do echo 加油;sleep 1;done"
        ],
        "State": {
            "Status": "running", #状态，正在运行
            "Running": true,
            "Paused": false,
            "Restarting": false,
            "OOMKilled": false,
            "Dead": false,
            "Pid": 102361, #父进程id
            "ExitCode": 0,
            "Error": "",
            "StartedAt": "2020-12-06T11:05:29.359496168Z",
            "FinishedAt": "0001-01-01T00:00:00Z"
        },
        #来源镜像
        "Image": "sha256:0d120b6ccaa8c5e149176798b3501d4dd1885f961922497cd0abef155c869566",
        "ResolvConfPath": "/var/lib/docker/containers/a090835bd80a92c306552ad1e3f8878d30218a3930363a02c7d3dda9fd58dc11/resolv.conf",
        "HostnamePath": "/var/lib/docker/containers/a090835bd80a92c306552ad1e3f8878d30218a3930363a02c7d3dda9fd58dc11/hostname",
        "HostsPath": "/var/lib/docker/containers/a090835bd80a92c306552ad1e3f8878d30218a3930363a02c7d3dda9fd58dc11/hosts",
        "LogPath": "/var/lib/docker/containers/a090835bd80a92c306552ad1e3f8878d30218a3930363a02c7d3dda9fd58dc11/a090835bd80a92c306552ad1e3f8878d30218a3930363a02c7d3dda9fd58dc11-json.log",
        "Name": "/mystifying_knuth",
        "RestartCount": 0,
        "Driver": "overlay2",
        "Platform": "linux",
        "MountLabel": "",
        "ProcessLabel": "",
        "AppArmorProfile": "",
        "ExecIDs": null,
        #主机配置
        "HostConfig": {
            "Binds": null,
            "ContainerIDFile": "",
            "LogConfig": {
                "Type": "json-file",
                "Config": {}
            },
            "NetworkMode": "default",
            "PortBindings": {},
            "RestartPolicy": {
                "Name": "no",
                "MaximumRetryCount": 0
            },
            "AutoRemove": false,
            "VolumeDriver": "",
            "VolumesFrom": null,
            "CapAdd": null,
            "CapDrop": null,
            "Capabilities": null,
            "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",
            "ConsoleSize": [
                0,
                0
            ],
            "Isolation": "",
            "CpuShares": 0,
            "Memory": 0,
            "NanoCpus": 0,
            "CgroupParent": "",
            "BlkioWeight": 0,
            "BlkioWeightDevice": [],
            "BlkioDeviceReadBps": null,
            "BlkioDeviceWriteBps": null,
            "BlkioDeviceReadIOps": null,
            "BlkioDeviceWriteIOps": null,
            "CpuPeriod": 0,
            "CpuQuota": 0,
            "CpuRealtimePeriod": 0,
            "CpuRealtimeRuntime": 0,
            "CpusetCpus": "",
            "CpusetMems": "",
            "Devices": [],
            "DeviceCgroupRules": null,
            "DeviceRequests": null,
            "KernelMemory": 0,
            "KernelMemoryTCP": 0,
            "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"
            ],
            "ReadonlyPaths": [
                "/proc/bus",
                "/proc/fs",
                "/proc/irq",
                "/proc/sys",
                "/proc/sysrq-trigger"
            ]
        },
        #其他配置
        "GraphDriver": {
            "Data": {
                "LowerDir": "/var/lib/docker/overlay2/e23f8f5784064d4b3702358bf17453096310b90f0dd43c180fafb30109672e6e-init/diff:/var/lib/docker/overlay2/ebace8a6bc46f06628921d249a99eb8ec3b12fdb47a2c40e66989690c97969d1/diff",
                "MergedDir": "/var/lib/docker/overlay2/e23f8f5784064d4b3702358bf17453096310b90f0dd43c180fafb30109672e6e/merged",
                "UpperDir": "/var/lib/docker/overlay2/e23f8f5784064d4b3702358bf17453096310b90f0dd43c180fafb30109672e6e/diff",
                "WorkDir": "/var/lib/docker/overlay2/e23f8f5784064d4b3702358bf17453096310b90f0dd43c180fafb30109672e6e/work"
            },
            "Name": "overlay2"
        },
        "Mounts": [],#挂载
        #基本配置
        "Config": {
            "Hostname": "a090835bd80a",
            "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"
            ], #基本环境变量
            #基本命令
            "Cmd": [
                "/bin/sh",
                "-c",
                "while true;do echo 加油;sleep 1;done"
            ],
            "Image": "centos",
            "Volumes": null,
            "WorkingDir": "",
            "Entrypoint": null,
            "OnBuild": null,
            "Labels": {
                "org.label-schema.build-date": "20200809",
                "org.label-schema.license": "GPLv2",
                "org.label-schema.name": "CentOS Base Image",
                "org.label-schema.schema-version": "1.0",
                "org.label-schema.vendor": "CentOS"
            }
        },
        #网卡，比如现在用的是桥接的网卡
        "NetworkSettings": {
            "Bridge": "",
            "SandboxID": "a7b521474bb5603d76d12275115a14d85664a860b463f438859711ac71a0b032",
            "HairpinMode": false,
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "Ports": {},
            "SandboxKey": "/var/run/docker/netns/a7b521474bb5",
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "EndpointID": "a8129a09e534148c7339fd04039ead2704468dec190059ad58c4ea376077e41c",
            "Gateway": "172.17.0.1",
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.3",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
            "MacAddress": "02:42:ac:11:00:03",
            "Networks": {
                "bridge": {
                    "IPAMConfig": null,
                    "Links": null,
                    "Aliases": null,
                    "NetworkID": "6b3878e096dcd5ddd4238ff53e18ff7dc6e5056d7328a1dce1b980b4aedff9e4",
                    "EndpointID": "a8129a09e534148c7339fd04039ead2704468dec190059ad58c4ea376077e41c",
                    "Gateway": "172.17.0.1",
                    "IPAddress": "172.17.0.3",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,
                    "MacAddress": "02:42:ac:11:00:03",
                    "DriverOpts": null
                }
            }
        }
    }
]

进入正在运行的容器

docker exec -it 容器id   /bin/bash   # 方法1 (常用)
docker attach 容器id

#测试
#方法 1
[root@ysl ~]# docker exec -it a1a1ec80a208 /bin/bash
[root@a1a1ec80a208 /]# ls
bin  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
[root@a1a1ec80a208 /]# ps -ef
UID          PID    PPID  C STIME TTY          TIME CMD
root           1       0  0 11:01 pts/0    00:00:00 /bin/bash
root          15       0  1 11:23 pts/1    00:00:00 /bin/bash
root          29      15  0 11:24 pts/1    00:00:00 ps -ef
[root@a1a1ec80a208 /]# exit
exit
[root@ysl ~]# docker ps 
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
a1a1ec80a208        centos              "/bin/bash"         25 minutes ago      Up 58 seconds                           charming_ride
#方法 2
[root@ysl ~]# docker attach a1a1ec80a208
[root@a1a1ec80a208 /]# docker ps 
bash: docker: command not found
[root@a1a1ec80a208 /]# ps -ef 
UID          PID    PPID  C STIME TTY          TIME CMD
root           1       0  0 11:01 pts/0    00:00:00 /bin/bash
root          31       1  0 11:24 pts/0    00:00:00 ps -ef
[root@a1a1ec80a208 /]# exit
exit
[root@ysl ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES

# 区别
# docker exec # 进入容器后开启一个新的终端，可以在里面操作，在exit退出后，容器正常运行
# docker attach 进入容器正在执行的终端，不会启动新的进程，在exit退出后，容器关闭

从容器内将文件拷贝到主机

docker cp 容器id: 容器文件全路径 需要拷贝到主机的路径

[root@ysl ~]# docker ps
CONTAINER ID        IMAGE               COMMAND             CREATED             STATUS              PORTS               NAMES
a1a1ec80a208        centos              "/bin/bash"         2 hours ago         Up 2 hours                              charming_ride      
[root@ysl ~]# docker attach a1a1ec80a208
[root@a1a1ec80a208 /]# ls
bin  dev  etc  home  lib  lib64  lost+found  media  mnt  opt  proc  root  run  sbin  srv  sys  tmp  usr  var
[root@a1a1ec80a208 /]# cd home/
[root@a1a1ec80a208 home]# ls     
[root@a1a1ec80a208 home]# touch test.java
[root@a1a1ec80a208 home]# ls
test.java
[root@a1a1ec80a208 home]# exit
exit
[root@ysl ~]# cd /home/
[root@ysl home]# ls
mysql
#容器文件拷贝到主机
[root@ysl home]# docker cp a1a1ec80a208:/home/test.java /home
[root@ysl home]# ls
mysql  test.java

查看内存占用

docker stats

CONTAINER ID        NAME                CPU %               MEM USAGE / LIMIT     MEM %               NET I/O             BLOCK I/O           PIDS
a1a1ec80a208        charming_ride       0.00%               1.102MiB / 1.705GiB   0.06%               1.87kB / 0B         0B / 0B             1

Docker 镜像

posted @ 2020-12-06 21:51 十一YS 阅读(170) 评论(0) 编辑收藏举报

刷新页面返回顶部

YSL-十一

Docker学习

Docker学习

Centon 8安装 Docker

初次运行 hello

查看下载镜像

卸载Docker

阿里云镜像加速

底层原理

Docker命令

镜像命令

解释

镜像搜索

下载镜像

删除镜像

容器命令

新建容器并启动

进入退出容器

查看运行的容器

退出容器

删除容器

启动和停止容器的操作

常用其他命令

启动、关闭 Docker

后台启动镜像

查看日志

查看正在运行容器的完整信息

进入正在运行的容器

从容器内将文件拷贝到主机

查看内存占用

Docker 镜像

公告