i try to tests features with docker,
and i am asking why i can not interact with nginx contenair
it is launched ?
docker run -ti nginx
What is the way to run the nginx docker AND be able to launch commands into the contenair ?
You can try this command
docker run -it nginx bash
This command will run a container from the nginx image, and access inside that container.
Related
I am building an image from this docker file for NGinx
FROM nginx
COPY html /usr/share/nginx/html
I then run the container using this command
docker run -v /C/nginx/html:/usr/share/nginx/html -p 8081:80 -d --name cntr-mynginx mynginx:abc
This works and I am able to mount the folder and the changes made in the html folder on the host can be seen when within the container file system. The edits made on the container filesystem under the /usr/share/nginx/html folder are visible on the host as well.
Why does the same not work when I use an Ubuntu base? This is the docker file for the Ubuntu container I am trying to spin up.
FROM ubuntu:18.04
COPY html /home
I used this command to run it
docker run -v /C/ubuntu-only/html:/home -p 8083:8080 --name cntr-ubuntu img-ubuntu:abc
The command above runs and when I do a docker ps -a, I see that the container stopped as soon as it started.
I removed the copy of the html and made the ubuntu image even more smaller by keeping just the first line FROM ubuntu:18.04 and even then I get the same result. Container Exited almost soon as it started. Any idea why this works for NGINX but not for Ubuntu and what do I need to do to make it work?
The issue you are experiencing does not have to do with mounting a directory into your container.
The command above runs and when I do a docker ps -a, I see that the container stopped as soon as it started.
The container is exiting due to the fact that there is no process being specified for it to run.
In the NGINX case, you can see that a CMD instruction is set at the end of the Dockerfile.
CMD ["nginx", "-g", "daemon off;"]
This starts NGINX as a foreground process, and prevents the container from exiting immediately.
The Ubuntu Dockerfile is different in that it specifies bash as the command the container will run at start.
CMD ["/bin/bash"]
Because bash does not run as a foreground process here, the container exits immediately.
Try augmenting your docker run command to include a process that stays in the foreground, like sleep.
docker run -v /C/ubuntu-only/html:/home -p 8083:8080 --name cntr-ubuntu img-ubuntu:abc sleep 9000
If you run docker exec -it cntr-ubuntu /bin/bash you should find yourself inside the container and verify that the mounted directory is present.
I don't want to install postgres locally but as I have it in my docker container, I'd like to be able to run its commands and utils, like pg_dump myschema > schema.sql.
How can I run commands related to running containers inside of them?
docker exec -it <container> <cmd>
e.g.
docker exec -it your-container /bin/bash
There are different options
You can actually copy files to docker using docker cp command. Copy required files to docker and then you can go inside the docker and run the command.
Make some modification in docker file for docker image creation. Its actually really simple to create docker file. Then using EXPOSE option you can expose a port. After that you can use docker run --publish ie.. -p option to publish a container’s port(s) to the host. Then you can access postgres from outside and run scripts from outside by creating connection.
In the first option you need go inside the containers. For that first list running dockers using docker ps command. After that you can use docker exec -it container_name /bin/bash command
Dockerfile contains
FROM java:8
Iam running this by mounting my host directory into docker by following command
docker run -it -p 8585:9090 -v ~/Docker/:/data d23bdf5b1b1b /data/bin/script.sh
I am able to run this successfully but the problem is when i try to access it from browser i am not able to see anything because of port conflicting
,2 services are running on same port ..
How to solve this ?
Your problem is that you are trying to run a script in a new container and that container then exists. It has nothing to with any existing container that is running.
Also when your specify a command to be run with docker it would not run the CMD command that you had defined while building the Dockerfile.
So what you need to do is below.
docker run -d -p 8585:9090 -v ~/Docker/:/data d23bdf5b1b1b
After the above container is run it will print the ID of the new container. Now you want to execute your command in this new container
docker exec -it <containerid> /data/bin/script.sh
I am using nodeBB to start a server you can run ./nodebb start to stop you can do ./nodebb stop. Now that I have dockerized it http://nodebb-francais.readthedocs.org/projects/nodebb/en/latest/installing/docker/nodebb-redis.html I am not sure how I can interact with it.
I have followed the steps "Using docker-machine mac os x"
docker run --name my-forum-redis -d -p 6379:6379 nodebb/docker:ubuntu-redis
Then
docker run --name my-forum-nodebb --link my-forum-redis:redis -p 80:80 -p 443:443 -p 4567:4567 -P -t -i nodebb/docker:ubuntu
Then
docker start my-forum-nodebb
I had an issue with redis address in use, so I want to fix that and restart but I am not sure how? Also I would like to issue the command grunt in the project directory, again not sure how?
My question is how can I interact with an app inside a docker container as if I had direct access to the project folder itself? Am I missing something?
All code in this answer is untested, as I'm currently at a computer without docker.
See whether the containers are still running
docker ps
Stop misconfigured containers
docker stop my-forum-redis
docker stop my-forum-nodebb
Remove misconfigured containers and their volumes
(The docker images they are based on will be retained.)
docker rm --volumes --force stop my-forum-nodebb
docker rm --volumes --force my-forum-redis
Start again
Then, issue your 3 commands again, now with the correct ports.
Execute arbitrary commands inside container
Also I would like to issue the command grunt in the project directory, again not sure how?
You probably want to do the following after the docker run --name my-forum-nodebb ... command but before docker start my-forum-nodebb.
docker run accepts a command to execute instead of the container's default command. Let's first use this to find out where in the container we'd land:
docker run my-forum-nodebb pwd
If that is the directory where you want to run grunt, just go forward with it:
docker run my-forum-nodebb grunt
If not, you'll have to stuff several commands into a single one. You can do that by invoking a shell:
docker run my-forum-nodebb bash -c 'cd /path/to/project/dir; grunt'
where /path/to/project/dir is to be replaced by where you want to run grunt.
I have created Docker container and Tomcat is running in this container. How can I deploy a webapp or war file in Tomcat that is running in docker container.
First create a Dockerfile:
FROM library/tomcat
RUN rm -rf /usr/local/tomcat/webapps/*
ADD ./relative/path_to_war.war /usr/local/tomcat/webapps/ROOT.war
Then build Docker image
$ docker build -t user/image_name .
And finally run docker container.
$ docker run --name container_name -p 80:8080 -d user/image_name
After that your webapp should be responding on Docker host's ip on default http 80 port.
You might need to link a database container to your webapp, see more on Docker documentation
You can implement an effective way of using Tomcat Docker.
docker run -d -p 80:8080 -v <mount-path>:/usr/local/tomcat/webapps/ tomcat:8.0
And then copy the .war files to the mounted volume. This would eliminate the need for restarting the Tomcat Docker each time when there is a code change. A zero downtime implementation could be achieved.
If it's a one-time deployment then you may create a custom Docker and copy the war file into /usr/local/tomcat/webapps/ and start the Docker.