以上答案也是正确的

有两种方法

使用的人 每隔一分钟运行脚本以获取新的docker映像

我只是分享脚本，可能会对你有帮助! 你可以用cronjob，我在OSX上成功尝试过

#!/bin/bash
##You can use below commented line for setting cron tab for running cron job and to store its O/P in one .txt file  
#* * * * * /usr/bin/sudo -u admin -i bash -c /Users/Swapnil/Documents/checkimg.sh > /Users/Swapnil/Documents/cron_output.log 2>&1
# Example for the Docker Hub V2 API
# Returns all images and tags associated with a Docker Hub organization account.
# Requires 'jq': https://stedolan.github.io/jq/

# set username, password, and organization
# Filepath where your docker-compose file is present
FILEPATH="/Users/Swapnil/Documents/lamp-alpine"
# Your Docker hub user name
UNAME="ur username"
# Your Docker hub user password
UPASS="ur pwd"
# e.g organisation_name/image_name:image_tag
ORG="ur org name"
IMGNAME="ur img name"
IMGTAG="ur img tag"
# Container name
CONTNAME="ur container name"
# Expected built mins
BUILDMINS="5"
#Generally cronjob frequency
CHECKTIME="5"
NETWORKNAME="${IMGNAME}_private-network"
#After Image pulling, need to bring up all docker services?
DO_DOCKER_COMPOSE_UP=true
# -------
echo "Eecuting Script @ date and time in YmdHMS: $(date +%Y%m%d%H%M%S)"
set -e
PIDFILE=/Users/Swapnil/Documents/$IMGNAME/forever.pid
if [ -f $PIDFILE ]
then
  PID=$(cat $PIDFILE)
  ps -p $PID > /dev/null 2>&1
  if [ $? -eq 0 ]
  then
    echo "Process already running"
    exit 1
  else
    ## Process not found assume not running
    echo $$
    echo $$ > $PIDFILE
    if [ $? -ne 0 ]
    then
      echo "Could not create PID file"
      exit 1
    fi
  fi
else
  echo $$ > $PIDFILE
  if [ $? -ne 0 ]
  then
    echo "Could not create PID file"
    exit 1
  fi
fi

# Check Docker is running or not; If not runing then exit
if docker info|grep Containers ; then
    echo "Docker is running"
else
    echo "Docker is not running"
    rm $PIDFILE
    exit 1
fi

# Check Container is running or not; and set variable
CONT_INFO=$(docker ps -f "name=$CONTNAME" --format "{{.Names}}")
if [ "$CONT_INFO" = "$CONTNAME" ]; then
    echo "Container is running"
    IS_CONTAINER_RUNNING=true
else
    echo "Container is not running"
    IS_CONTAINER_RUNNING=false
fi


# get token
echo "Retrieving token ..."
TOKEN=$(curl -s -H "Content-Type: application/json" -X POST -d '{"username": "'${UNAME}'", "password": "'${UPASS}'"}' https://hub.docker.com/v2/users/login/ | jq -r .token)

# get list of repositories
echo "Retrieving repository list ..."
REPO_LIST=$(curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/${ORG}/?page_size=100 | jq -r '.results|.[]|.name')

# output images & tags
echo "Images and tags for organization: ${ORG}"
echo
for i in ${REPO_LIST}
do
  echo "${i}:"
  # tags
  IMAGE_TAGS=$(curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/${ORG}/${i}/tags/?page_size=100 | jq -r '.results|.[]|.name')
  for j in ${IMAGE_TAGS}
  do
    echo "  - ${j}"
  done
  #echo
done

# Check Perticular image is the latest or not
#imm=$(curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/${ORG}/${IMGNAME}/tags/?page_size=100)
echo "-----------------"
echo "Last built date details about Image ${IMGNAME} : ${IMGTAG} for organization: ${ORG}"
IMAGE_UPDATED_DATE=$(curl -s -H "Authorization: JWT ${TOKEN}" https://hub.docker.com/v2/repositories/${ORG}/${IMGNAME}/tags/?page_size=100 | jq -r '.results|.[]|select(.name | contains("'${IMGTAG}'")).last_updated')
echo "On Docker Hub IMAGE_UPDATED_DATE---$IMAGE_UPDATED_DATE"
echo "-----------------"

IMAGE_CREATED_DATE=$(docker image inspect ${ORG}/${IMGNAME}:${IMGTAG} | jq -r '.[]|.Created')
echo "Locally IMAGE_CREATED_DATE---$IMAGE_CREATED_DATE"

updatedDate=$(date -jf '%Y-%m-%dT%H:%M' "${IMAGE_UPDATED_DATE:0:16}" +%Y%m%d%H%M%S) 
createdDate=$(date -jf '%Y-%m-%dT%H:%M' "${IMAGE_CREATED_DATE:0:16}" +%Y%m%d%H%M%S)
currentDate=$(date +%Y%m%d%H%M%S)

start_date=$(date -jf "%Y%m%d%H%M%S" "$currentDate" "+%s")
end_date=$(date -jf "%Y%m%d%H%M%S" "$updatedDate" "+%s")
updiffMins=$(( ($start_date - $end_date) / (60) ))
if [[ "$updiffMins" -lt $(($CHECKTIME+1)) ]]; then
        if [ ! -d "${FILEPATH}" ]; then
            mkdir "${FILEPATH}";
        fi
        cd "${FILEPATH}"
        pwd
        echo "updatedDate---$updatedDate" > "ScriptOutput_${currentDate}.txt"
        echo "createdDate---$createdDate" >> "ScriptOutput_${currentDate}.txt"
        echo "currentDate---$currentDate" >> "ScriptOutput_${currentDate}.txt"
        echo "Found after regular checking time -> Docker hub's latest updated image is new; Diff ${updiffMins} mins" >> "ScriptOutput_${currentDate}.txt"
        echo "Script is checking for latest updates after every ${CHECKTIME} mins" >> "ScriptOutput_${currentDate}.txt"
        echo "Fetching all new"
        echo "---------------------------"
        if $IS_CONTAINER_RUNNING ; then
            echo "Container is running"         
        else
            docker-compose down
            echo "Container stopped and removed; Network removed" >> "ScriptOutput_${currentDate}.txt"
        fi
        echo "Image_Created_Date=$currentDate" > ".env"
        echo "ORG=$ORG" >> ".env"
        echo "IMGNAME=$IMGNAME" >> ".env"
        echo "IMGTAG=$IMGTAG" >> ".env"
        echo "CONTNAME=$CONTNAME" >> ".env"
        echo "NETWORKNAME=$NETWORKNAME" >> ".env"
        docker-compose build --no-cache
        echo "Docker Compose built" >> "ScriptOutput_${currentDate}.txt"
        if $DO_DOCKER_COMPOSE_UP ; then
            docker-compose up -d
            echo "Docker services are up now, checked in" >> "ScriptOutput_${currentDate}.txt"  
        else
            echo "Docker services are down, checked in" >> "ScriptOutput_${currentDate}.txt"
        fi
elif [[ "$updatedDate" -gt "$createdDate" ]]; then 
    echo "Updated is latest"
    start_date=$(date -jf "%Y%m%d%H%M%S" "$updatedDate" "+%s")
    end_date=$(date -jf "%Y%m%d%H%M%S" "$createdDate" "+%s")
    diffMins=$(( ($start_date - $end_date) / (60) ))
    if [[ "$BUILDMINS" -lt "$diffMins" ]]; then
        if [ ! -d "${FILEPATH}" ]; then
            mkdir "${FILEPATH}";
        fi
        cd "${FILEPATH}"
        pwd
        echo "updatedDate---$updatedDate" > "ScriptOutput_${currentDate}.txt"
        echo "createdDate---$createdDate" >> "ScriptOutput_${currentDate}.txt"
        echo "currentDate---$currentDate" >> "ScriptOutput_${currentDate}.txt"
        echo "Found after comparing times -> Docker hub's latest updated image is new; Diff ${diffMins} mins" >> "ScriptOutput_${currentDate}.txt"
        echo "Actual image built time is less i.e. ${diffMins} mins than MAX expexted BUILD TIME i.e. ${BUILDMINS} mins" >> "ScriptOutput_${currentDate}.txt"
        echo "Fetching all new" >> "ScriptOutput_${currentDate}.txt"
        echo "-----------------------------"
        if $IS_CONTAINER_RUNNING ; then
            echo "Container is running"         
        else
            docker-compose down
            echo "Container stopped and removed; Network removed" >> "ScriptOutput_${currentDate}.txt"
        fi
        echo "Image_Created_Date=$currentDate" > ".env"
        echo "ORG=$ORG" >> ".env"
        echo "IMGNAME=$IMGNAME" >> ".env"
        echo "IMGTAG=$IMGTAG" >> ".env"
        echo "CONTNAME=$CONTNAME" >> ".env"
        echo "NETWORKNAME=$NETWORKNAME" >> ".env"
        docker-compose build --no-cache
        echo "Docker Compose built" >> "ScriptOutput_${currentDate}.txt"
        if $DO_DOCKER_COMPOSE_UP ; then
            docker-compose up -d
            echo "Docker services are up now" >> "ScriptOutput_${currentDate}.txt"  
        else
            echo "Docker services are down" >> "ScriptOutput_${currentDate}.txt"
        fi
    elif [[ "$BUILDMINS" -gt "$diffMins" ]]; then
        echo "Docker hub's latest updated image is NOT new; Diff ${diffMins} mins"
        echo "Docker images not fetched"
    else
        echo "Docker hub's latest updated image is NOT new; Diff ${diffMins} mins"
        echo "Docker images not fetched"
    fi
elif [[ "$createdDate" -gt "$updatedDate" ]]; then 
    echo "Created is latest"
    start_date=$(date -jf "%Y%m%d%H%M%S" "$createdDate" "+%s")
    end_date=$(date -jf "%Y%m%d%H%M%S" "$updatedDate" "+%s")
    echo "Docker hub has older docker image than local; Older than $(( ($start_date - $end_date) / (60) ))mins"
fi
echo 
echo "------------end---------------"
rm $PIDFILE

这是我的docker-compose文件

version:  "3.2"
services:
  lamp-alpine:
    build:
      context: .
    container_name: "${CONTNAME}"
    image: "${ORG}/${IMGNAME}:${IMGTAG}"
    ports:
      - "127.0.0.1:80:80"
    networks:
      - private-network 

networks:
  private-network:
    driver: bridge

Docker映像的依赖管理是一个真正的问题。我所在的团队开发了一个名为MicroBadger的工具，通过监视容器图像和检查元数据来帮助解决这个问题。它的功能之一是让你设置一个通知网络钩子，当你感兴趣的图像(例如基本图像)发生变化时，它会被调用。

一个简单而伟大的解决方案是牧羊人

你不会知道你的集装箱在后面没有运行码头拉。然后，您需要重新构建或重组您的映像。

docker pull image:tag
docker-compose -f docker-compose.yml -f production.yml up -d --build

这些命令可以与完成升级所需的任何其他东西一起放在脚本中，尽管一个合适的容器不需要任何额外的东西。

更新:使用Dependabot - https://dependabot.com/docker/

BLUF:找到正确的插入点来监视容器的更改是一个挑战。如果DockerHub能解决这个问题，那就太好了。(存储库链接已经提到过，但注意在DockerHub上设置它们时-“每当在DockerHub上更新基本映像时，都会在此存储库中触发一个构建。只适用于非官方图片。”)

当我自己尝试解决这个问题时，我看到了几个webhook的建议，所以我想详细说明我使用过的几个解决方案。

Use microbadger.com to track changes in a container and use it's notification webhook feature to trigger an action. I set this up with zapier.com (but you can use any customizable webhook service) to create a new issue in my github repository that uses Alpine as a base image. Pros: You can review the changes reported by microbadger in github before taking action. Cons: Microbadger doesn't let you track a specific tag. Looks like it only tracks 'latest'. Track the RSS feed for git commits to an upstream container. ex. https://github.com/gliderlabs/docker-alpine/commits/rootfs/library-3.8/x86_64. I used zapier.com to monitor this feed and to trigger an automatic build of my container in Travis-CI anytime something is committed. This is a little extreme but you can change the trigger to do other things like open an issue in your git repository for manual intervention. Pros: Closer to an automated pipline. The Travis-CI build just checks to see if your container has issues with whatever was committed to the base image repository. It's up to you if your CI service takes any further action. Cons: Tracking the commit feed isn't perfect. Lots of things get committed to the repository that don't affect the build of the base image. Doesn't take in to account any issues with frequency/number of commits and any API throttling.

我也遇到过同样的问题，我认为可以通过cron作业每天调用无人值机升级来简单解决。

我的意图是将其作为一种自动和快速的解决方案，以确保生产容器是安全和更新的，因为更新映像和部署具有最新安全更新的新docker映像需要花费一些时间。

也可以使用Github钩子自动化映像的构建和部署

我已经创建了一个基本的docker映像，每天自动检查和安装安全更新(可以通过docker run itech/docker- unattentedupgrade直接运行)。

我还发现了另一种检查容器是否需要更新的方法。

我的完整实现:

Dockerfile

FROM ubuntu:14.04   

RUN apt-get update \
&& apt-get install -y supervisor unattended-upgrades \
&& rm -rf /var/lib/apt/lists/*

COPY install /install
RUN chmod 755 install
RUN /install

COPY start /start
RUN chmod 755 /start

辅助脚本

安装

#!/bin/bash
set -e

cat > /etc/supervisor/conf.d/cron.conf <<EOF
[program:cron]
priority=20
directory=/tmp
command=/usr/sbin/cron -f
user=root
autostart=true
autorestart=true
stdout_logfile=/var/log/supervisor/%(program_name)s.log
stderr_logfile=/var/log/supervisor/%(program_name)s.log
EOF

rm -rf /var/lib/apt/lists/*

ENTRYPOINT ["/start"]

开始

#!/bin/bash

set -e

echo "Adding crontab for unattended-upgrade ..."
echo "0 0 * * * root /usr/bin/unattended-upgrade" >> /etc/crontab

# can also use @daily syntax or use /etc/cron.daily

echo "Starting supervisord ..."
exec /usr/bin/supervisord -n -c /etc/supervisor/supervisord.conf

Edit

我开发了一个小工具docker-run，它作为docker容器运行，可以用来更新所有或选定的运行容器中的包，它也可以用来运行任何任意命令。

可以使用以下命令轻松测试:

Docker run——rm -v /var/run/ Docker .sock:/tmp/ Docker .sockSock itech/docker-run exec

默认情况下，它将在所有运行的容器中执行date命令并显示结果。如果你传递update而不是exec，它将在所有运行的容器中执行apt-get update和apt-get upgrade -y