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How to verify docker sha256 on hub.docker with docker?

A
authera last edited by

Given an https://hub.docker.com/layers/natpdev/git-cloner/latest/images/sha256-6889517fd553d36ed5743827cd81c8f94438bd2502db57e9bbfbfac73e746f5b?context=explore

I want to be able to verify that the image I have matches

DIGEST:sha256:6889517fd553d36ed5743827cd81c8f94438bd2502db57e9bbfbfac73e746f5b

How can this be done in docker's command line tool?
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elysha

Use this command

docker images --digests

You'll get this output

REPOSITORY    TAG       DIGEST                                                                    IMAGE ID       CREATED        SIZE
hello-world   latest    sha256:80f31da1ac7b312ba29d65080fddf797dd76acfb870e677f390d5acba9741b17   feb5d9fea6a5   8 months ago   13.3kB

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The docker cache needs the following: Build has been run on the same docker host previously (or you explicitly added flags to trust a pulled image) and The previous image needs to still be on the build host (not pruned) and The same previous layer and either The same command being run (including the same environment/args) or The same hash on the files being copied If you see the cache being busted on a COPY or ADD command, and not the previous step, then you need to look at the hash being generated. All the files need to be identical, same file names, cases, file permissions, file owners, and the contents need to be bit for bit identical. You can look at the resulting checksum for this hash by running a docker image history command, e.g.: $ docker image history golang:alpine IMAGE CREATED CREATED BY SIZE COMMENT 6b21b4c6e7a3 3 weeks ago /bin/sh -c #(nop) WORKDIR /go 0B <missing> 3 weeks ago /bin/sh -c mkdir -p "$GOPATH/src" "$GOPATH/b… 0B <missing> 3 weeks ago /bin/sh -c #(nop) ENV PATH=/go/bin:/usr/loc… 0B <missing> 3 weeks ago /bin/sh -c #(nop) ENV GOPATH=/go 0B <missing> 3 weeks ago /bin/sh -c set -eux; apk add --no-cache --v… 344MB <missing> 3 weeks ago /bin/sh -c #(nop) ENV GOLANG_VERSION=1.12.7 0B <missing> 3 weeks ago /bin/sh -c [ ! -e /etc/nsswitch.conf ] && ec… 17B <missing> 3 weeks ago /bin/sh -c apk add --no-cache ca-certifica… 551kB <missing> 3 weeks ago /bin/sh -c #(nop) CMD ["/bin/sh"] 0B <missing> 3 weeks ago /bin/sh -c #(nop) ADD file:0eb5ea35741d23fe3… 5.58MB You can include the --no-trunc option to get a full line. The key piece of data relevant to your question from the above image is in the ADD step where you see file:0eb5ea35741d23fe3…. If that checksum changes between two image builds, the cache will bust and you'll start a new set of layers.
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There is a comprehensive document about k8s' DNS. According to this document one could validate whether the DNS is working by running: busybox.yaml apiVersion: v1 kind: Pod metadata: name: busybox namespace: default spec: containers: - image: busybox command: - sleep - "3600" imagePullPolicy: IfNotPresent name: busybox restartPolicy: Always and deploy it by issuing: kubectl create -f busybox.yaml Once deployed, one could run: kubectl get pods busybox and validate whether the DNS is working: kubectl exec -ti busybox -- nslookup kubernetes.default There are additional validation steps that could be executed, including: kubectl exec busybox cat /etc/resolv.conf verify the DNS policy, check whether the DNS pod runs, checking erros in the DNS pod: kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c kubedns kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c dnsmasq kubectl logs --namespace=kube-system $(kubectl get pods --namespace=kube-system -l k8s-app=kube-dns -o name) -c sidecar does the DNS service run? kubectl get svc --namespace=kube-system exposed DNS endpoints? kubectl get ep kube-dns --namespace=kube-system There are also multiple known issues regarding the k8s' DNS: Linux’s libc is impossibly stuck (see this bug from 2005) with limits of just 3 DNS nameserver records and 6 DNS search records. Kubernetes needs to consume 1 nameserver record and 3 search records. This means that if a local installation already uses 3 nameservers or uses more than 3 searches, some of those settings will be lost. As a partial workaround, the node can run dnsmasq which will provide more nameserver entries, but not more search entries. You can also use kubelet’s --resolv-conf flag.
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Yes your understanding is correct. The RUN ``` command in the Dockerfile is somewhat equivalent to container = $(docker run base-image) #1 docker exec base-image commands #2 docker commit $container #3 Since images are static, we'll need a running instance/process to execute our command. this is why a container is created from the base image. #1 After the execution of the command in #2, the changes are committed back #3, which means a new layer is created on top of the previous layers. This layer will contain the changes introduced by the container in (#2).
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You cannot change the default registry (see this). You have to specify which registry to use like this: docker pull myprivatereg:port/library/image Or, in a Dockerfile: FROM myprivatereg:port/library/image (This question was also asked in StackOverlow).
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sudo systemctl enable --now dockerand systemctl status docker What are they saying? You don't seem to have started the service.
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Instead of writing your own Dockerfile, you can simply pass auth through environment variables to official images, I use compose file something like this: version: '3.1' services: mongo: image: mongo restart: always container_name: mongo environment: MONGO_INITDB_ROOT_USERNAME: root MONGO_INITDB_ROOT_PASSWORD: abcd ports: - "27017:27017" volumes: - ./databases:/data/db mongo-express: image: mongo-express restart: always container_name: mongo-express ports: - 8081:8081 environment: ME_CONFIG_MONGODB_ADMINUSERNAME: root ME_CONFIG_MONGODB_ADMINPASSWORD: abcd you can have your database persisted in ./databases folder and nice in browser ui at port :8081
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Service Level Agreement https://en.wikipedia.org/wiki/Service-level_agreement https://www.atlassian.com/it-unplugged/best-practices-and-trends/stop-hating-on-slas https://www.cio.com/article/2438284/outsourcing/outsourcing-sla-definitions-and-solutions.html What will happen if the docker registry is down? Are all departments blocked? What is the impact? If all production images reside in a docker registry and someone wants to release a newer version to production, but the registry is down, is it still possible to release the product? SLA is about defining processes, checking the impact of each of them and the more important the higher the SLA. One could this tool to choose a certain SLA for a certain procedure: https://uptime.is/ A SLA of 99.999 https://uptime.is/99.999 means a yearly downtime of 5m 15.6s, while https://uptime.is/99.9 means 8h 45m 57.0s. One could set a SLA of 99.999 for the docker processes, but is a downtime of 5m 15.6s really required or is 8h 45m 57.0s in a year acceptable? If one hosts an ecommerce website and the webshop is down a couple of hours this will cause a lot of harm for the company as customers could not buy products and will probably buy products somewhere else. For the docker processes that are used by developers and for releases to production one could argue that the first one could be 99.9 and the latter 99.999.
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I was doing that in a graduation study.It’s not suitable for stackoverflow, which is a Q&A site for programming, but it doesn’t work with programming.Since image processing is an engineering that handles real-world things, it is more important to know about real-world such as hardware, not just software.General answers are difficult,For example, the basic knowledge of photography technology such as how to choose a camera and lens, and how to apply lighting.In addition, if you observe the fish, it is also important to learn the target habits and knowledge of breeding.If you are talking about this time, I think it is a positive method to invent the shape of the lighting and the aquarium.
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But if I have a simple app like a python hello world, what prevents this from running on both operating systems? It won't work in the same way that copying /usr/bin/python from a Linux machine to a Windows machine and using it to run your application doesn't work. Docker isn't running the hello world script, it's running Python, which needs to be compiled for specific operating systems and architectures.
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If you're married to Docker Hub, you could use a webhook to notify Travis of the need to start it's job. However, I solve this problem using Quay.io - it has the robot account (you refer to "service account") you need. It also has a richer set of notifications. You could maintain your current workflow using webhooks to create the repository on Quay or Docker Hub, have the image built on git events. Create a webhook in the repository to send data to your Travis job when builds succeed Or, you could build your images in the Travis job. Push the initial image to a repository on Quay Add a robot account to your repository in Quay Add the necessary secrets to your Travis build (token and robot user name) Configure Travis to build the image, run whatever tests you need and then push on green. Add an after_success task to redeploy your app in k8s after the push.

How to verify docker sha256 on hub.docker with docker?

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