假设我有一个基于ubuntu:latest的普通容器。现在有一个安全更新和ubuntu:latest更新在docker repo。

我如何知道我的本地映像及其容器运行落后? 是否有一些最佳实践来自动更新本地映像和容器来跟踪docker回购更新,这在实践中会给你同样的好处,让无人值守的升级运行在传统的ubuntu机器上


当前回答

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

其他回答

You can use Watchtower to watch for updates to the image a container is instantiated from and automatically pull the update and restart the container using the updated image. However, that doesn't solve the problem of rebuilding your own custom images when there's a change to the upstream image it's based on. You could view this as a two-part problem: (1) knowing when an upstream image has been updated, and (2) doing the actual image rebuild. (1) can be solved fairly easily, but (2) depends a lot on your local build environment/practices, so it's probably much harder to create a generalized solution for that.

If you're able to use Docker Hub's automated builds, the whole problem can be solved relatively cleanly using the repository links feature, which lets you trigger a rebuild automatically when a linked repository (probably an upstream one) is updated. You can also configure a webhook to notify you when an automated build occurs. If you want an email or SMS notification, you could connect the webhook to IFTTT Maker. I found the IFTTT user interface to be kind of confusing, but you would configure the Docker webhook to post to https://maker.ifttt.com/trigger/`docker_xyz_image_built`/with/key/`your_key`.

如果你需要在本地构建,你至少可以通过在Docker Hub中创建一个连接到你感兴趣的repo的虚拟repo来解决上游映像更新时收到通知的问题。虚拟回购的唯一目的是在重新构建时触发一个webhook(这意味着它的一个链接回购被更新)。如果你能收到这个webhook,你甚至可以用它来触发你这边的重建。

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

这里有很多答案,但没有一个符合我的需要。我想知道提问者第一个问题的确切答案。如何知道hub.docker.com上的图像何时更新?

下面的脚本可以每天运行。在第一次运行时,它从HUB注册中心获得标记的基线和更新日期,并将它们保存在本地。从那时起,每次运行它都会检查注册表中的新标记和更新日期。因为每当有新图像存在时,它都会改变,所以它会告诉我们基本图像是否发生了变化。以下是剧本:

#!/bin/bash

DATAPATH='/data/docker/updater/data'

if [ ! -d "${DATAPATH}" ]; then
        mkdir "${DATAPATH}";
fi
IMAGES=$(docker ps --format "{{.Image}}")
for IMAGE in $IMAGES; do
        ORIGIMAGE=${IMAGE}
        if [[ "$IMAGE" != *\/* ]]; then
                IMAGE=library/${IMAGE}
        fi
        IMAGE=${IMAGE%%:*}
        echo "Checking ${IMAGE}"
        PARSED=${IMAGE//\//.}
        if [ ! -f "${DATAPATH}/${PARSED}" ]; then
                # File doesn't exist yet, make baseline
                echo "Setting baseline for ${IMAGE}"
                curl -s "https://registry.hub.docker.com/v2/repositories/${IMAGE}/tags/" > "${DATAPATH}/${PARSED}"
        else
                # File does exist, do a compare
                NEW=$(curl -s "https://registry.hub.docker.com/v2/repositories/${IMAGE}/tags/")
                OLD=$(cat "${DATAPATH}/${PARSED}")
                if [[ "${VAR1}" == "${VAR2}" ]]; then
                        echo "Image ${IMAGE} is up to date";
                else
                        echo ${NEW} > "${DATAPATH}/${PARSED}"
                        echo "Image ${IMAGE} needs to be updated";
                        H=`hostname`
                        ssh -i /data/keys/<KEYFILE> <USER>@<REMOTEHOST>.com "{ echo \"MAIL FROM: root@${H}\"; echo \"RCPT TO: <USER>@<EMAILHOST>.com\"; echo \"DATA\"; echo \"Subject: ${H} - ${IMAGE} needs update\"; echo \"\"; echo -e \"\n${IMAGE} needs update.\n\ndocker pull ${ORIGIMAGE}\"; echo \"\"; echo \".\"; echo \"quit\"; sleep 1; } | telnet <SMTPHOST> 25"
                fi

        fi
done;

您可能需要更改顶部的DATAPATH变量,并更改末尾的电子邮件通知命令以满足您的需要。对我来说,我把它SSH到我的SMTP所在的另一个网络上的服务器上。但是您也可以轻松地使用邮件命令。

现在,您还需要检查容器本身中是否有更新的包。这实际上可能比在容器工作后“拉”更有效。以下是实现这一目标的脚本:

#!/bin/bash


function needsUpdates() {
        RESULT=$(docker exec ${1} bash -c ' \
                if [[ -f /etc/apt/sources.list ]]; then \
                grep security /etc/apt/sources.list > /tmp/security.list; \
                apt-get update > /dev/null; \
                apt-get upgrade -oDir::Etc::Sourcelist=/tmp/security.list -s; \
                fi; \
                ')
        RESULT=$(echo $RESULT)
        GOODRESULT="Reading package lists... Building dependency tree... Reading state information... Calculating upgrade... 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded."
        if [[ "${RESULT}" != "" ]] && [[ "${RESULT}" != "${GOODRESULT}" ]]; then
                return 0
        else
                return 1
        fi
}

function sendEmail() {
        echo "Container ${1} needs security updates";
        H=`hostname`
        ssh -i /data/keys/<KEYFILE> <USRER>@<REMOTEHOST>.com "{ echo \"MAIL FROM: root@${H}\"; echo \"RCPT TO: <USER>@<EMAILHOST>.com\"; echo \"DATA\"; echo \"Subject: ${H} - ${1} container needs security update\"; echo \"\"; echo -e \"\n${1} container needs update.\n\n\"; echo -e \"docker exec ${1} bash -c 'grep security /etc/apt/sources.list > /tmp/security.list; apt-get update > /dev/null; apt-get upgrade -oDir::Etc::Sourcelist=/tmp/security.list -s'\n\n\"; echo \"Remove the -s to run the update\"; echo \"\"; echo \".\"; echo \"quit\"; sleep 1; } | telnet <SMTPHOST> 25"
}

CONTAINERS=$(docker ps --format "{{.Names}}")
for CONTAINER in $CONTAINERS; do
        echo "Checking ${CONTAINER}"
        if needsUpdates $CONTAINER; then
                sendEmail $CONTAINER
        fi
done

我们使用一个脚本来检查正在运行的容器是否以最新映像启动。我们还使用upstart init脚本来启动docker映像。

    #!/usr/bin/env bash
    set -e
    BASE_IMAGE="registry"
    REGISTRY="registry.hub.docker.com"
    IMAGE="$REGISTRY/$BASE_IMAGE"
    CID=$(docker ps | grep $IMAGE | awk '{print $1}')
    docker pull $IMAGE

    for im in $CID
    do
        LATEST=`docker inspect --format "{{.Id}}" $IMAGE`
        RUNNING=`docker inspect --format "{{.Image}}" $im`
        NAME=`docker inspect --format '{{.Name}}' $im | sed "s/\///g"`
        echo "Latest:" $LATEST
        echo "Running:" $RUNNING
        if [ "$RUNNING" != "$LATEST" ];then
            echo "upgrading $NAME"
            stop docker-$NAME
            docker rm -f $NAME
            start docker-$NAME
        else
            echo "$NAME up to date"
        fi
    done

init看起来像这样

docker run -t -i --name $NAME $im /bin/bash

一种“docker方式”是使用docker hub自动构建。当上游容器被重建时,Repository Links特性将重建你的容器,Webhooks特性将向你发送通知。

看起来webhooks仅限于HTTP POST调用。您需要设置一个服务来捕获它们,或者可能使用其中一个POST发送电子邮件服务。

我还没有深入研究,但是新的Docker通用控制平面可能有一个检测更新容器和重新部署的功能。