I am trying to build a new docker image.
docker build . -t tg
.....
.....
Removing intermediate container ba85d1deadeb
---> 353fcb84af6b
Successfully built 353fcb84af6b
Successfully tagged tg:latest
But for some reason, after it is successfully built I could neither run it nor find it.
docker images
<none> <none> c18e928477c3 11 days ago 1.01GB
...... a long list of unrelated images that are intermediate steps of the built process .....
docker image ls , docker images -a aren't helping either.
sudo docker run -i -t 353fcb84af6b
Unable to find image '353fcb84af6b:latest' locally
docker: Error response from daemon: pull access denied for 353fcb84af6b, repository does not exist or may require 'docker login'.
See 'docker run --help'.
when running docker run -i -t tg:latest result is the same.
The issue seems to be specific to THIS particular image... Other successfully built images DO show up after running docker images.
Dockerfile
Any pointers are much appreciated.
On linux
try:
docker buildx build --progress=plain --load .
1- In order to run docker commands, use sudo user.
WHY -> The docker daemon binds to a Unix socket instead of a TCP port. By default that Unix socket is owned by the user root and other users can only access it using sudo.
Get your images build with sudo docker build -t tag_name --no-cache .
To see the images - sudo docker images
Also, you cannot use tag with image ID - Unable to find image '353fcb84af6b:latest' locally
In order to run your image, you can either use JUST image ID or image_name:tag.
Related
I pulled a docker image from https://github.com/snowflakedb/SnowAlert.
But after pulling the Image, I don't see any containers running. I used
docker container ls command and it returned no containers.
Now due to some usecase I want to modify a file inside this docker image.
What is the correct way to do it?
Thanks
Here is what resolved my issue.
After pulling the repository from the github I ran below commands
sudo docker images
This will display the names of existing images. Now copy the Image name in which you need to do the modification.
sudo docker run -it <copied_image_name> bash
This will open a bash where all the files are residing. Do the modification where ever it is required then type exit
Copy the container Id from below command
sudo docker ps -a
Now we need to commit the changes into new Image using below command
sudo docker commit <container_id> <new_image_name>
Thats all
Now do sudo docker images this will display the newly created image with the modified content.
Thanks
Don't confuse image with container: https://phoenixnap.com/kb/docker-image-vs-container.
You need to "up" image to create appropriate container for it: https://docs.docker.com/get-started/part2/#run-your-image-as-a-container
If you want to inspect/edit any container use command (it like ssh to container's server):
docker exec -it CONTAINER_ID bash
To get all docker containers and find their IDs use command:
docker ps -a
I created docker a docker image of a spring boot application using the below command
docker build -f Dockerfile -t myimage
once i run the command "docker images" I see that image. Now I want to get that image out my local machine and run on another machine using the below command.
docker run -p 8085:8085 myimage
What are the steps to relocate docker image to another machine over a physical medium?
/var/lib/docker/images/overlay2/imagedb/content
but that local contain .txt files of 6KB. I know normally a docker image is around 600MB in size.
Could anyone please help me to find the exact location.
Thank you
1.You can export your docker image after building it.
docker build -f Dockerfile -t myimage .
docker save myimage > myimage.tar You will see this in your directory where you execute docker build command.
Then you can load it anywhere else as
docker load < myimage.tar
Other than that if there is a docker repo , you can simply push the docker image.
Reference:- https://docs.docker.com/engine/reference/commandline/export/#options
2.If the other machine can be reachable via a network you can setup the other machine as a docker hub
I am trying to build a new docker image using docker provided base Ubuntu image. I'll be using docker file to run few scripts and install applications on the base image. However my script requirement is that the hostname should remain same. I couldn't find any information on OS names for docker images. Does anybody has an idea that once we add layers to a docker image does the OS name remains same.
You can set the hostname with the -h argument to Docker run, otherwise it gets the short form of the container ID as the hostname:
$ docker run --rm -it debian bash
root#0d36e1b1ac93:/# exit
exit
$ docker run --rm -h myhost -it debian bash
root#myhost:/# exit
exit
As far as I know, you can't tell docker build to use a given hostname, but see Dockerfile HOSTNAME Instruction for docker build like docker run -h.
I have successfully shelled into a RUNNING docker container using
docker exec -i -t 7be21f1544a5 bash
I have made some changes to some json files and wanted to apply these changes to reflect online.
I am a beginner and have tried to restart, mount in vain. What strings I have to replace when I mount using docker run?
Is there any online sample?
CONTAINER ID: 7be21f1544a5
IMAGE: gater/web
COMMAND: "/bin/sh -c 'nginx'"
CREATED: 4 weeks ago
STATUS: Up 44 minutes
PORTS: 443/tcp, 172.16.0.1:10010->80/tcp
NAMES: web
You can run either create a Dockefile and run:
docker build .
from the same directory where your Dockerfile is located.
or you can run:
docker run -i -t <docker-image> bash
or (if your container is already running)
docker exec -i -t <container-id> bash
once you are in the shell make all the changes you please. Then run:
docker commit <container-id> myimage:0.1
You will have a new docker image locally myimage:0.1. If you want to push to a docker repository (dockerhub or your private docker repo) you can run:
docker push myimage:0.1
There are 2 ways to do it :
Dockerfile approach
You need to know what changes you have made into Docker container after you have exec into it and also the Dockerfile of the image .
Lets say you installed additional rpm using yum install command after entering into the container (yum install perl-HTML-Format) and updated some file say /opt/test.json inside contianer (take a backup of this file in Docker host in some directory or in directory Dockerfile exist)
The above command/steps you can place in Dockerfile as
RUN yum install perl-HTML-Format
COPY /docker-host-dir/updated-test.json /opt/test.json
Once you update the Dockerfile, create the new image and push it to Docker repository
docker build -t test_image .
docker push test_image:latest
You can save the updated Dockerfile for future use.
Docker commit command approach
After you made the changes to container, use below commands to create a new image from container's changes and push it online
docker commit container-id test_image
docker push test_image
docker commit --help
Usage: docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]
You don't want to do that. After you figured out what you needed you throw away the running container (git rm 7be21f1544a5), repeat the changes in the Dockerfile and build a new image to run.
I am getting into Docker and am trying to better understand how it works out there in the "real world".
It occurs to me that, in practice:
You need a way to version Docker images
You need a way to tell the Docker engine (running on a VM) to stop/start/restart a particular container
You need a way to tell the Docker engine which version of a image to run
Does Docker ship with built-in commands for handling each of these? If not what tools/strategies are used for accomplishing them? Also, when I build a Docker image (via, say, docker build -t myapp .), what file type is produced and where is it located on the machine?
docker has all you need to build images and run containers. You can create your own image by writing a Dockerfile or by pulling it from the docker hub.
In the Dockerfile you specify another image as the basis for your image, run command install things. Images can have tags, for example the ubuntu image can have the latest or 12.04 tag, that can be specified with ubuntu:latest notation.
Once you have built the image with docker build -t image-name . you can create containers from that image with `docker run --name container-name image-name.
docker ps to see running containers
docker rm <container name/id> to remove containers
Suppose we have a docker file like bellow:
->Build from git without versioning:
sudo docker build https://github.com/lordash/mswpw.git#fecomments:comments
in here:
fecomments is branch name and comments is the folder name.
->building from git with tag and version:
sudo docker build https://github.com/lordash/mswpw.git#fecomments:comments -t lordash/comments:v1.0
->Now if you want to build from a directory: first go to comments directory the run command sudo docker build .
->if you want to add tag you can use -t or -tag flag to do that:
sudo docker build -t lordash . or sudo docker build -t lordash/comments .
-> Now you can version your image with the help of tag:
sudo docker build -t lordash/comments:v1.0 .
->you can also apply multiple tag to an image:
sudo docker build -t lordash/comments:latest -t lordash/comments:v1.0 .