I have a Jenkins running on Docker container and local docker registry.
docker-compose up
it does't go out side network rather pulls the image from local registry.
Is there a way i can update my local docker registry with latest Jenkins image?
And when i run docker-compose up i have latest Jenkins? Thank you!
So by default docker nature is always look for image available on host-machine and if not specific tag is provided it will search for default tag which is latest .
So in your case when you already have latest jenkins image available on host docker-compose will always use that image pretending this is the latest one. For using latest image available from registry you need to clean/delete jenkins image from your host who is having latest tag.
Delete and use latest jenkins image:
docker rmi -f jenkins:latest
docker-compose stop
docker-compose rm -f
docker-compose pull
docker-compose up -d
this is your private registry so you need to login to it:
docker login my-server.test:5000
Related
I have created a container using the following command: docker container run -i ubuntu. However, when I try to run a command within the container, such as cd, I get the following error: bash: line 1: cd: $'bin\r': No such file or directory. What could be the issue?
When you docker run an image, or use an image in a Dockerfile FROM line, or name an image: in a Docker Compose setup, Docker first checks to see if you have that image locally. If you have that image, Docker just uses it without checking Docker Hub or the other upstream registry.
Meanwhile, you can docker build or docker tag an image with any name you want...even a name that matches an official Docker Hub image.
You mention in a comment that you at some point did run docker build -t ubuntu .... That replaces the ubuntu image with what you built, so when you later docker run ubuntu, it's running your modified image and not the official Docker Hub Ubuntu image.
This is straightforward to fix. If you
docker rmi ubuntu
it will delete your local (modified) copy, and the next time you use it, Docker will automatically pull it from Docker Hub. It should also work to
# Explicitly get the Docker Hub copy of the image
docker pull ubuntu
# Build a custom image, pulling whatever's in the FROM line
docker build --pull -t my/image .
(You can also hit this in a Docker Compose setup if you specify both image: and build:; this instructs Compose on an explicit name to use for the built image. You do not need to repeat the FROM line in image:, and it causes trouble if you do. The resolution is the same as described above. I might leave image: out entirely unless you're planning to push the image to a registry.)
I have the latest portainer running to manage my images and containers in docker.
For cleaning up I want to have the command "docker images prune" to run daily.
For this I want to use Portainer host jobs, like it is shown here.
I did extaclty the same setting, same commands, but in my portinaer there is just 1 "created" conntainer of the ubuntu image and nothing happens.
Changing docker image from ubuntu:latest to ubuntu:18.04 fixed this issue for me
I am trying to migrate from gitlab-ce to gitlab.com. This includes Docker registry as well. What I need to migrate Gitlab Docker Registry to hosted Docker registry (Nexus3). This might be manually done I imagine, but is there any more efficient way to do it?
Normally I used the following workflow for each tag:
docker pull SRC_REGISTRY_HOST/<REPOSITORY:TAG
docker tag SRC_REGISTRY_HOST/<REPOSITORY:TAG DEST_REGISTRY_HOST/<REPOSITORY:TAG
docker push DEST_REGISTRY_HOST/<REPOSITORY:TAG
But I couldn't find it clean so I wrote a small tool to automate all the steps and just use the following:
docker run --rm -it smqasims/imagesync --src SRC_REGISTRY_HOST/<REPOSITORY> --dest DEST_REGISTRY_HOST/<REPOSITORY
This will sync both the repositories and is faster/manageable compared to the other workflow.
I would like to build docker-image on Gitlab CI/CD with alpine. This docker has to download a website (only index.html) as a file with a date every 1 hour.
All dates/ files should be saved in the docker volume.
How to start with this? I am new in docker.
First you need to run a docker container using any image you want (alpine in your case).
Then set everything in it that you want to run (like download website)
Then create a docker image and host it on gitlab docker registry
Then you simply have to code .gitlab-ci.yaml file. After pushing that to your repository
Then you need to schedule your pipeline as mentioned here
https://docs.gitlab.com/ee/user/project/pipelines/schedules.html
I am trying to deploy a stack of services in a swarm on a local machine for testing purpose and i want to build the docker image whenever i run or deploy a stack from the manager node.
Is it possible what I am trying to achieve..
On Docker Swarm you can't build an image specified in a Docker Compose file:
Note: This option is ignored when deploying a stack in swarm mode with a (version 3) Compose file. The docker stack command accepts only pre-built images. - from docker docs
You need to create the image with docker build (on the folder where the Dockerfile is located):
docker build -t imagename --no-cache .
After this command the image (named imagename) is now available on the local registry.
You can use this image on your Docker Compose file like the following:
version: '3'
services:
example-service:
image: imagename:latest
You need to build the image with docker build. Docker swarm doesn't work with tags to identify images. Instead it remembers the image id (hash) of an image when executing stack deploy, because a tag might change later on but the hash never changes.
Therefore you should reference the hash of your image as shown by docker image ls so that docker swarm will not try to find your image on some registry.
version: '3'
services:
example-service:
image: imagename:97bfeeb4b649
While updating a local image you will get an error as below
image IMAGENAME:latest could not be accessed on a registry to record
its digest. Each node will access IMAGENAME:latest independently,
possibly leading to different nodes running different
versions of the image.
To overcome this issue start the service forcefully as follows
docker service update --image IMAGENAME:latest --force Service Name
In the above example it is as
docker service update --image imagename:97bfeeb4b649 --force Service Name