docker笔记7--Docker常见操作

docker笔记7--Docker常见操作

  • 1 docker 简介
    • 1.1 基本概念
    • 1.2 安装方法
    • 1.3 nvidia-docker 安装
  • 2 常见命令
    • 2.1 基础命令
    • 2.2 容器操作命令
    • 2.3 镜像操作命令
    • 2.4 常见配置
  • 3 Dockerfile实例
    • 3.1 构建 flask dockerfile
    • 3.2 构建带cron 和 CST时区镜像
  • 4 常见问题
  • 6 说明

1 docker 简介

1.1 基本概念

Docker 是一个开源的应用容器引擎,基于 Go 语言 并遵从 Apache2.0 协议开源。
Docker 可以让开发者打包他们的应用以及依赖包到一个轻量级、可移植的容器中,然后发布到任何流行的 Linux 机器上,也可以实现虚拟化。

  1. 仓库
    仓库(Repository)是集中存放镜像的地方,大部分需求都可以通过在 Docker Hub 中直接下载镜像来实现;
    目前 Docker 官方维护了一个公共仓库 Docker Hub, 一般使用这个仓库即可,也可以根据需要使用其它厂家的开源仓库,如阿里云的仓库。
  2. 镜像
    镜像是一个包含很多指令的只读模版,它可以用来创建docker 容器。
    通常一个镜像是基于另外一个镜像生成的,一般会在上面添加一些自定义部分,如工具资源、业务应用。
  3. 容器
    容器是一个可执行镜像的实例,我们可以通过 docker api或cli 对容器进行create、start、stop、move或者delete一个容器。 也可以连接一个容器到1个或者多个为例,并为容器附加存储,甚至可以基于容器当前状态创建一个新的镜像。

1.2 安装方法

  1. 通过源安装
    按照官方文档,添加源安装,此处以Ubuntu为例,其它系统一官文为主
    1)向系统添加官方Docker存储库的GPG密钥:
    curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
    2)add-apt-repository 是由 Python-software-properties这个工具包提供的,所以要先安装python-software-properties 才能使用 add-apt-repository
    apt-get install python-software-properties
    apt-get update
    3)将Docker存储库添加到APT源
    add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
    
    4)使用来自新添加的repo的Docker包更新包数据库:
    apt-get update
    确保你要安装的是Docker repo而不是默认的Ubuntu 16.04 repo
    apt-cache policy docker-ce(看到docker-ce相关的版本信息)
    5)apt-get install -y docker-ce(默认为最新版本,也可以指定版本安装)
    docker-compose安装,pip 安装或者下载解压安装
  2. 命令安装
    wget -qO- https://get.docker.com | sh 或者 curl -fsSL get.docker.com | sh 即可完成docker安装,该方法安装的为最新版本docker
  3. 使用国内阿里云源安装
    使用su - 进入root用户:
    sudo apt-get -y install apt-transport-https ca-certificates curl software-properties-common
    curl -fsSL http://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | sudo apt-key add -
    sudo add-apt-repository "deb [arch=amd64] http://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"
    sudo apt-get update
    sudo apt-get install docker-ce
    pip install docker-compose
    [Ubuntu使用国内源安装指定Docker版本](https://blog.csdn.net/M82_A1/article/details/98870376)
    
  4. 二进制安装
    从 下载二进制文件,解压文件,并 拷贝文件到/usr/bin 目录
    1)解压
    tar zxvf docker-19.03.14.tgz 
    2)拷贝
    cp docker/* /usr/bin/
    3)新建docker组
    groupadd docker
    注意:此处一定要添加docker组,否则启动时候会报类似下面这样的错误:
    docker.serviceJob for docker.service failed
    4)新建可执行shell文件,并添加相关内容
    touch /etc/init.d/docker
    chmod 755 /etc/init.d/docker
    增加如下内容(实际建议从已有的系统上拷贝一个近似版本的文件):
    #!/bin/sh
    set -e
    
    ### BEGIN INIT INFO
    # Provides:           docker
    # Required-Start:     $syslog $remote_fs
    # Required-Stop:      $syslog $remote_fs
    # Should-Start:       cgroupfs-mount cgroup-lite
    # Should-Stop:        cgroupfs-mount cgroup-lite
    # Default-Start:      2 3 4 5
    # Default-Stop:       0 1 6
    # Short-Description:  Create lightweight, portable, self-sufficient containers.
    # Description:
    #  Docker is an open-source project to easily create lightweight, portable,
    #  self-sufficient containers from any application. The same container that a
    #  developer builds and tests on a laptop can run at scale, in production, on
    #  VMs, bare metal, OpenStack clusters, public clouds and more.
    ### END INIT INFO
    
    export PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
    
    BASE=docker
    
    # modify these in /etc/default/$BASE (/etc/default/docker)
    DOCKERD=/usr/bin/dockerd
    # This is the pid file managed by docker itself
    DOCKER_PIDFILE=/var/run/$BASE.pid
    # This is the pid file created/managed by start-stop-daemon
    DOCKER_SSD_PIDFILE=/var/run/$BASE-ssd.pid
    DOCKER_LOGFILE=/var/log/$BASE.log
    DOCKER_OPTS=
    DOCKER_DESC="Docker"
    
    # Get lsb functions
    . /lib/lsb/init-functions
    
    if [ -f /etc/default/$BASE ]; then
    	. /etc/default/$BASE
    fi
    
    # Check docker is present
    if [ ! -x $DOCKERD ]; then
    	log_failure_msg "$DOCKERD not present or not executable"
    	exit 1
    fi
    
    check_init() {
        # see also init_is_upstart in /lib/lsb/init-functions (which isn't available in Ubuntu 12.04, or we'd use it directly)
        if [ -x /sbin/initctl ] && /sbin/initctl version 2>/dev/null | grep -q upstart; then
     	   log_failure_msg "$DOCKER_DESC is managed via upstart, try using service $BASE $1"
     	   exit 1
        fi
    }
    
    fail_unless_root() {
        if [ "$(id -u)" != '0' ]; then
     	   log_failure_msg "$DOCKER_DESC must be run as root"
     	   exit 1
        fi
    }
    
    cgroupfs_mount() {
        # see also https://github.com/tianon/cgroupfs-mount/blob/master/cgroupfs-mount
        if grep -v '^#' /etc/fstab | grep -q cgroup \
     	   || [ ! -e /proc/cgroups ] \
     	   || [ ! -d /sys/fs/cgroup ]; then
     	   return
        fi
        if ! mountpoint -q /sys/fs/cgroup; then
     	   mount -t tmpfs -o uid=0,gid=0,mode=0755 cgroup /sys/fs/cgroup
        fi
        (
     	   cd /sys/fs/cgroup
     	   for sys in $(awk '!/^#/ { if ($4 == 1) print $1 }' /proc/cgroups); do
     		   mkdir -p $sys
     		   if ! mountpoint -q $sys; then
     			   if ! mount -n -t cgroup -o $sys cgroup $sys; then
     				   rmdir $sys || true
     			   fi
     		   fi
     	   done
        )
    }
    
    case "$1" in
        start)
     	   check_init
     	
     	   fail_unless_root
    
     	   cgroupfs_mount
    
    		   touch "$DOCKER_LOGFILE"
     	   chgrp docker "$DOCKER_LOGFILE"
    
     	   ulimit -n 1048576
    
     	   # Having non-zero limits causes performance problems due to accounting overhead
     	   # in the kernel. We recommend using cgroups to do container-local accounting.
     	   if [ "$BASH" ]; then
     		   ulimit -u unlimited
     	   else
     		   ulimit -p unlimited
     	   fi
    
     	   log_begin_msg "Starting $DOCKER_DESC: $BASE"
     	   start-stop-daemon --start --background \
     		   --no-close \
     		   --exec "$DOCKERD" \
     		   --pidfile "$DOCKER_SSD_PIDFILE" \
     		   --make-pidfile \
     		   -- \
     			   -p "$DOCKER_PIDFILE" \
     			   $DOCKER_OPTS \
     				   >> "$DOCKER_LOGFILE" 2>&1
     	   log_end_msg $?
     	   ;;
    
        stop)
     	   check_init
     	   fail_unless_root
     	   if [ -f "$DOCKER_SSD_PIDFILE" ]; then
     		   log_begin_msg "Stopping $DOCKER_DESC: $BASE"
     		   start-stop-daemon --stop --pidfile "$DOCKER_SSD_PIDFILE" --retry 10
     		   log_end_msg $?
     	   else
     		   log_warning_msg "Docker already stopped - file $DOCKER_SSD_PIDFILE not found."
     	   fi
     	   ;;
    
        restart)
     	   check_init
     	   fail_unless_root
     	   docker_pid=`cat "$DOCKER_SSD_PIDFILE" 2>/dev/null`
     	   [ -n "$docker_pid" ] \
     		   && ps -p $docker_pid > /dev/null 2>&1 \
     		   && $0 stop
     	   $0 start
     	   ;;
    
        force-reload)
     	   check_init
     	   fail_unless_root
     	   $0 restart
     	   ;;
    
        status)
     	   check_init
     	   status_of_proc -p "$DOCKER_SSD_PIDFILE" "$DOCKERD" "$DOCKER_DESC"
     	   ;;
    
        *)
     	   echo "Usage: service docker {start|stop|restart|status}"
     	   exit 1
     	   ;;
    esac
    5)启动docker
    # /etc/init.d/docker start
    [ ok ] Starting docker (via systemctl): docker.service.
    
  5. 升级方式
    升级方法1:卸载旧的docker,重新安装新版本
    卸载方法:apt-get remove docker docker-engine docker.io containerd runc
    重新添加源,并安装最新docker:apt-get install docker-ce docker-ce-cli containerd.io
    how-to-completely-uninstall-docker

1.3 nvidia-docker 安装

使用1.2 中的方法安装普通docker后,再安装nvidia-docker

  1. 安装方法
    curl -s -L https://nvidia.github.io/nvidia-docker/gpgkey | apt-key add -
    distribution=$(. /etc/os-release;echo $ID$VERSION_ID)
    curl -s -L https://nvidia.github.io/nvidia-docker/$distribution/nvidia-docker.list > /etc/apt/sources.list.d/nvidia-docker.list
    apt-get update
    apt-get install -y nvidia-docker2 nvidia-container-runtime
    安装成功后,daemon.json中会有对应的 runtimes参数(data-root是自己加的),内容如下:
    {
        "runtimes": {
            "nvidia": {
                "path": "nvidia-container-runtime",
                "runtimeArgs": []
            }
        },
        "data-root": "/home/docker"
    }
    
  2. 测试方法
    1)下载cuda镜像,直接在dockerhub 搜cuda即可,笔者使用 nvidia/cuda:10.2-base
    2)使用如下命令测试
    docker run --runtime=nvidia --rm nvidia/cuda:10.2-base nvidia-smi
    输出显卡信息:
    Thu Oct 15 08:33:15 2020       
    +-----------------------------------------------------------------------------+
    | NVIDIA-SMI 450.57       Driver Version: 450.57       CUDA Version: 11.0     |
    |-------------------------------+----------------------+----------------------+
    | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
    | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
    |                               |                      |               MIG M. |
    |===============================+======================+======================|
    |   0  GeForce GTX 108...  On   | 00000000:04:00.0 Off |                  N/A |
    | 21%   25C    P8     9W / 250W |      1MiB / 11178MiB |      0%      Default |
    |                               |                      |                  N/A |
    +-------------------------------+----------------------+----------------------+
    |   1  GeForce GTX 108...  On   | 00000000:08:00.0 Off |                  N/A |
    | 21%   19C    P8     9W / 250W |      1MiB / 11178MiB |      0%      Default |
    |                               |                      |                  N/A |
    +-------------------------------+----------------------+----------------------+
    
    也可以使用gpus device=1 来查看1号卡的信息
    docker run --gpus device=1 --rm nvidia/cuda:10.2-base nvidia-smi
    注意:
    测试的时候最好指定docker版本,否则容易出现cuda和驱动版本不一致的错误;
    –gpus 参数为较新版本的参数,需要升级docker版本,笔者使用当前最新 19.03.13

2 常见命令

2.1 基础命令

  1. docker run --name=container_name [-p pc_port:container_port] [-v pc_path_file:container_path_file] image_name
    若添加参数 --net host ,则直接使用本地网络,不需要单独映射
  2. docker rename old_name new_name
  3. docker stats container_name
  4. docker inspect container_name
  5. docker exec -it [--user root] container_name bash 通过--user就可以使用root用户进入容器了

2.2 容器操作命令

  1. 基础操作
    删除docker0
    ip link delete docker0
  2. 卷操作
    查看所有的卷
    docker volume ls
    删除所有未使用的数据,包括没有停止的容器、没有使用网络、dangling images 和 dangling build cache
    docker system prune  
    删除未使用的卷
    docker volume prune
    
  3. 容器自动重启
    新建容器的时候配置自动重启 docker run –restart=always
    
    配置自动重启 docker update –restart=always <CONTAINER ID>
    关闭自动重启 docker update –restart=no <CONTAINER ID>
    
    docker update --restart=no nacos-standalone-mysql
    
  4. 其它常见操作
    1. 删除所有 Exited 的容器
    docker ps -a|grep Exit|awk '{print $1}'|xargs docker rm
    

2.3 镜像操作命令

  1. 镜像保存与加载
    docker save -o filename image-name 可以将指定版本的镜像保卫为某个镜像包,docker load -i filename 可以将保存的镜像加载到系统中,案例如下:
    docker save -o flannel-v0.12.0-amd64.tar.gz quay.io/coreos/flannel:v0.12.0-amd64
    docker load -i flannel-v0.12.0-amd64.tar.gz
    
  2. 批量保存-加载镜像
    批量保存:
    docker images|tail -n +2|awk '{print $1":"$2, $1"-"$2".tar.gz"}'|awk '{print $1, gsub("/","-") $var}'|awk '{print "docker save -o " $3,$1}' > save_img.sh && bash save_img.sh
    批量加载(进入到镜像所在的目录,该目录不要保留其它无关的文件):
    for i in $(ls);do docker load -i $i; done
    
  3. 将容器保存为镜像
    docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]
    OPTIONS说明:
    -a :提交的镜像作者;
    -c :使用Dockerfile指令来创建镜像;
    -m :提交时的说明文字;
    -p :在commit时,将容器暂停。
    案例:
    docker commit -m "installed earch-pro and theme-comscore" -a "xg" 391449280df8 sre_gitbook:v1.0
    
  4. 清理不用的镜像
    docker image prune -fa --filter "until=240h"
    清理 10天前且没有被使用的镜像
    
  5. 查看容器、镜像占用空间
    [root@worker-k8s003 lib]# docker system df
    TYPE                TOTAL               ACTIVE              SIZE                RECLAIMABLE
    Images              104                 33                  51.4GB              29.29GB (56%)
    Containers          100                 92                  3.67GB              2.404GB (65%)
    Local Volumes       0                   0                   0B                  0B
    
    [root@worker-k8s003 lib]# docker system df -v
    Images space usage:
    
    REPOSITORY                                                             TAG                          IMAGE ID            CREATED ago         SIZE                SHARED SIZE         UNIQUE SiZE         CONTAINERS
    registry-vpc.cn-shanghai.aliyuncs.com/xmotors_dtp/gta-console          dev-21.52.2112281927         ec4fddb33230        15 hours ago ago    1.275GB             944.2MB             331.1MB             1
    registry-vpc.cn-shanghai.aliyuncs.com/xmotors_dtp/account              1.6.13                       8c7145786dc7        16 hours ago ago    1.186GB             917.8MB             268.5MB             1
    ......
    Containers space usage:
    
    CONTAINER ID        IMAGE                                                                  COMMAND                  LOCAL VOLUMES       SIZE                CREATED ago             STATUS                           NAMES
    b72dfb04309f        registry-vpc.cn-shanghai.aliyuncs.com/xmotors_dtp/account              "docker-entrypoint..."   0                   0B                  31 minutes ago ago      Up 31 minutes                    k8s_account_account-696d9f5b77-ln29l_pi-prod_97bd8041-684a-11ec-8646-00163e0630d4_0
    3f8ec85c0a80        99e59f495ffa                                                           "/pause"                 0                   0B                  31 minutes ago ago      Up 31 minutes                    k8s_POD_account-696d9f5b77-ln29l_pi-prod_97bd8041-684a-11ec-8646-00163e0630d4_0
    ...
    Local Volumes space usage:
    
    VOLUME NAME         LINKS               SIZE
    

2.4 常见配置

配置docker默认存储路径

$ cat /etc/docker/daemon.json 
{
  "hosts":[
    "unix:///var/run/docker.sock"
  ],
  "default-ulimits": {
    "nofile": {
      "Name": "nofile",
      "Hard": 1000000,
      "Soft": 1000000
    }
  },
  "ipv6": false,
  "iptables": true,
  "data-root": "/home/docker"
}
一般最好设置iptables为true,否则会出现容器内部无法访问公网的现象

改目录这个事情 有很多手段,dameon.json 是一种,直接软链接var/lib/docker也是一种 加-g也是一种
或者# cat /etc/default/docker, 追加 export DOCKER_OPTS=“-g /home/docker”

mac 设置方法:
注意: 早起docker版本使用的是graph,较新版本使用的是data-root

% cat ~/.docker/daemon.json
{
  "experimental" : false,
  "debug" : true,
  "registry-mirrors":["https://docker.mirrors.ustc.edu.cn","http://hub-mirror.c.163.com"],
  "data-root": "/home/xg/file/docker"
}

3 Dockerfile实例

3.1 构建 flask dockerfile

新建dockerfile

FROM ubuntu:16.04
RUN mkdir -p /home/flask
WORKDIR /home/flask
COPY app.py .
COPY sources.list /etc/apt
RUN install apt-transport-https -y && apt-get update && apt-get install curl -y && apt-get install python3 -y && apt-get install python3-pip -y && pip3 install flask
CMD python3 app.py

flask 案例

from flask import Flask

app = Flask(__name__)


@app.route('/')
def hello_root():
    print('v1.2 Hello Root!\n')
    return 'v1.2 Hello Root!\n'


@app.route('/hello')
def hello_world():
    print('v1.2 Hello World!\n')
    return 'v1.2 Hello World!\n'


if __name__ == '__main__':
    app.run(host='0.0.0.0')

sources.list 源

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://archive.ubuntu.com/ubuntu/ xenial main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ xenial main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://archive.ubuntu.com/ubuntu/ xenial-updates main restricted
# deb-src http://archive.ubuntu.com/ubuntu/ xenial-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://archive.ubuntu.com/ubuntu/ xenial universe
# deb-src http://archive.ubuntu.com/ubuntu/ xenial universe
deb http://archive.ubuntu.com/ubuntu/ xenial-updates universe
# deb-src http://archive.ubuntu.com/ubuntu/ xenial-updates universe

deb http://archive.ubuntu.com/ubuntu/ xenial multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ xenial multiverse
deb http://archive.ubuntu.com/ubuntu/ xenial-updates multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ xenial-updates multiverse

deb http://archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
# deb-src http://archive.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse

# deb http://archive.canonical.com/ubuntu xenial partner
# deb-src http://archive.canonical.com/ubuntu xenial partner

# deb http://security.ubuntu.com/ubuntu/ xenial-security main restricted
# deb-src http://security.ubuntu.com/ubuntu/ xenial-security main restricted
# deb http://security.ubuntu.com/ubuntu/ xenial-security universe
# deb-src http://security.ubuntu.com/ubuntu/ xenial-security universe
# deb http://security.ubuntu.com/ubuntu/ xenial-security multiverse
# deb-src http://security.ubuntu.com/ubuntu/ xenial-security multiverse

build 镜像, 起服务

在当前目录新建镜像
docker build -t ubuntu_flask:v1.0 .
起服务端口为5000
docker run --name=flask -d -p 5000:5000 ubuntu_flask:v1.0
对镜像打tag
docker tag ubuntu_flask:v1.0 dockerhub.xxx.com/xg/ubuntu_flask:v1.0
上传镜像到dockerhub
docker push dockerhub.xxx.com/xg/ubuntu_flask:v1.0

3.2 构建带cron 和 CST时区镜像

FROM ubuntu:20.04
RUN mkdir -p /home/
WORKDIR /home/
COPY alarm_and_notify.py .
COPY root /var/spool/cron/crontabs/root
ENV DEBIAN_FRONTEND noninteractive
RUN apt-get update && apt-get install -y apt-utils && apt-get install inetutils-ping -y && apt-get install telnet -y && apt-get install curl -y && apt-get install cron && apt-get install screen -y && apt-get install vim -y \
    && apt-get install tzdata -y && ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone && dpkg-reconfigure -f noninteractive tzdata \
    && apt-get install python3 -y && apt-get install python3-pip -y && pip3 install elasticsearch && pip3 install requests && pip3 install schedule && pip3 install pytz
CMD service cron start && sleep infinity
# CMD python3 -u /home/alarm_and_notify.py

注意: 需要将cron命令提前写到root文件内

4 常见问题

  1. Got permission denied while trying to connect to the Docker daemon socket
    docker进程使用Unix Socket而不是TCP端口。而默认情况下,Unix socket属于root用户,因此需要root权限才能访问。
    解决方法,将当前用户添加到docker组,更新docker组即可,如下:
    gpasswd -a yourUser docker #添加用户到docker
    newgrp docker #更新docker用户组
    更新完后即可使用该用户执行docker命令
  2. docker 启动报错–Starting docker (via systemctl): docker.serviceJob for docker.service failed because the control process exited with error code
    docker笔记7--Docker常见操作_第1张图片
    解决方法: 删掉/var/lib/docker 目录,去掉docker/daemon.json中不必要参数,重启docker即可
  3. docker build 出现 Temporary failure resolving ‘archive.ubuntu.com’
    解决方法:在daemon 中添加如下dns,并 docker restart 即可
    $ cat /etc/docker/daemon.json 
    {
      "log-driver": "json-file",
      "log-opts": {
        "max-size": "100m"
      },
      "storage-driver": "overlay2",
      "dns": ["8.8.8.8", "8.8.4.4", "2001:4860:4860::8888", "2001:4860:4860::8844"]
    }
    
  4. 安装docker 的时候提示 NO_PUBKEY 6ED91CA3AC1160CD
    W: GPG 错误:https://nvidia.github.io/libnvidia-container/stable/ubuntu18.04/amd64  InRelease: 由于没有公钥,无法验证下列签名: NO_PUBKEY 6ED91CA3AC1160CD 
    W: GPG error: https://nvidia.github.io/libnvidia-container/stable/ubuntu18.04/amd64  InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6ED91CA3AC1160CD
    解决方法:
    apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6ED91CA3AC1160CD(此处的key即为上面提示的key)
    
  5. docker 内update报错 Couldn’t create temporary file /tmp/apt.conf.Skg48r for passing config to apt-key
    解决方法:调整/tmp权限为777
  6. Error response from daemon: too many requests
    报错:
    # docker pull busybox
    Using default tag: latest
    Error response from daemon: toomanyrequests: You have reached your pull rate limit. You may increase the limit by authenticating and upgrading: https://www.docker.com/increase-rate-limit
    解决方法:用户dockerhub账户登录
    # docker login --username dockerhubxg
    Password: 
    WARNING! Your password will be stored unencrypted in /root/.docker/config.json.
    Configure a credential helper to remove this warning. See
    https://docs.docker.com/engine/reference/commandline/login/#credentials-store
    Login Succeeded
    登录后正常拉取镜像
    # docker pull busybox
    Using default tag: latest
    latest: Pulling from library/busybox
    f531cdc67389: Pull complete 
    Digest: sha256:ae39a6f5c07297d7ab64dbd4f82c77c874cc6a94cea29fdec309d0992574b4f7
    Status: Downloaded newer image for busybox:latest
    退出登录:
    # docker logout
    Removing login credentials for https://index.docker.io/v1/
    
    docker-hub/download-rate-limit/

6 说明

参考文档:
docker 官文主页

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