Im using keycloak docker image and need to synchronize time with chrony. however I cannot install chrony, because its not in repository i assume.
I use image from https://hub.docker.com/r/jboss/keycloak
ist based on registry.access.redhat.com/ubi8-minimal
Steps to reproduce:
~$ docker run -d --rm -p 8080:8080 --name keycloak jboss/keycloak
~$ docker exec -it -u root keycloak bash
root#707c136d9c8a /]# microdnf install chrony
error: No package matches 'chrony'
I'm not able to find working repo which provides chrony for redhat 8 minimal
Apparently i need synchronize time on host system, nothing to do with container itself.. Silly me, i need a break..
Related
I am trying to install a K8S cluster with Rancher, after installing docker successfully I ran the following command to install Rancher containers:
$ sudo docker run -d --restart=unless-stopped -p 8088:8088 rancher/server:stable
The console I got was:
As you can see I am not being able to download the Rancher containers, what could I do to make it work?
Well, starting with the point this Rancher installation is based on what is proposed in this link https://phoenixnap.com/kb/install-rancher-on-ubuntu. The Rancher version to be installed following the script in the link, according to Docker Hub, is 1.x.
So, I don't recommend the command proposed in the script:
sudo docker run -d --restart=unless-stopped -p 8080:8080 rancher/server:stable
See, the rancher/server must be replaced by: rancher/rancher:stable, then you will install latest Rancher version 2.x.
Also, to avoid the timeout problem you instead of using the command "docker run" go for "docker pull" first, then "docker run". In other words, after finishing the "pull" then you go with the "run" option. I recommend you run the following commands which will be faster and effective:
sudo docker pull rancher/rancher:latest
sudo docker run -d --restart=unless-stopped -p 8088:8088 -p 8443:8443 --privileged rancher/rancher:latest
After running that everything is in good shape, you can run your Rancher. I hope that can help someone, I lost one day to figure that out, since the download time takes hours each time you run to timeout and fail.
I want to create a docker container or image and have tensorflow and mongodb installed, I have seen that there are docker images for each application, but I need them to be working together, from a mongodb database I must extract the data to feed a model created in tensorflow.
Then I want to know if it is possible to have a configuration like that, since I have tried with a ubuntu container and inside it to install the applications I need, but I don't know if there is another way to do it.
Thanks.
Interesting that I find this post, and just found one solution for myself. Maybe not the one for you, BTW.
What I did is: docker pull mongo and run as daemon:
#!/bin/bash
export VOLUME='/home/user/code'
docker run -itd \
--name mongodb \
--publish 27017:27017 \
--volume ${VOLUME}:/code \
mongo
Here
the 'd' in '-itd' means running as daemon (like service, not
interactive).
The --volume may not be used.
Then docker pull tensorflow/tensorflow and run it with:
#!/bin/bash
export VOLUME='/home/user/code'
docker run \
-u 1000:1000 \
-it --rm \
--name tensorflow \
--volume ${VOLUME}:/code \
-w /code \
-e HOME=/code/tf_mongodb \
tensorflow/tensorflow bash
Here
the -u make docker bash with same ownership as host machine;
the --volume make host folder /home/user/code mapping to /code in docker;
the -w work make docker bash start from /code, which is /home/user/code in host;
the -e HOME= option sign bash $HOME folder such that later you can pip install.
Now you have bash prompt such that you can
create virtual env folder under /code (which is mapping to /home/user/code),
activate venv,
pip install pymongo,
then you can connect to mongodb you run in docker (localhost may not work, please use host IP address).
in my docker image I need to run an Apache Server to deploy my website, a glassfish server for deploying the corresponding backend and MongoDB on which the backend connects.
My dockerfile looks like this:
FROM httpd:2.4
FROM glassfish:latest
FROM mongo:3.6
COPY /backend_war_exploded /usr/local/glassfish4/glassfish/domains/domain1/autodeploy/backend_war_exploded
COPY /backend_war_exploded /usr/local/glassfish4/bin/backend_war_exploded
COPY /dist /usr/local/apache2/htdocs/
After building the image I run and start it with:
docker run -dit --name application -p 80:80 -p 8080:8080 -p 27017:27017 applicationimg
docker start application
When I try to access via http://localhost:80 it delivers the code: ERR_EMPTY_RESPONSE. Same for the backend but I can access mongodb on port 27017. When I am commenting out the FROM tags in my dockerfile and run everything separately it just works fine. Does somebody see the mistake? Thanks in advance.
UPDATE
I followed your suggestion and created rewrote the Dockerfile:
FROM ubuntu:16.04
COPY /dist /var/www/html/
COPY /backend_war_exploded /glassfish4/glassfish/domains/domain1/autodeploy/backend_war_exploded
RUN apt-get update && apt-get install -y apache2
RUN apt-get install -y openjdk-8-jdk
RUN apt-get install -y wget && apt-get install -y unzip
RUN wget http://download.java.net/glassfish/4.1.2/release/glassfish-4.1.2.zip
RUN unzip glassfish-4.1.2.zip
RUN cd /glassfish4/bin/ && ./asadmin start-domain domain1
EXPOSE 80
EXPOSE 8080
The webserver starts up and is accesable via localhost:80 but the glassfish server start while building the image but when running the docker image it is not started anymore. When I am accessing the container via docker exec I can navigate to glassfish and start it up manually. What is the issue?
You need to depend on on FROM only and add the other tools through RUN steps. or use single image for each application and connect them together through docker network or by creating a docker-compose.yml which will be easier, you can check it through here. Using multiple FROM does not mean that you are going to have all 3 in 1.
For more information about how to create Dockerfile and How to deploy your application with multiple containers you can check the get started tutorial from Docker
In order to run multiple service inside one container you need to use a service manager like Supervisor. Check the following link for more details: Multi-Service Container
I want do use a docker container to simulate my production environment, so I installed the db and the server in the same container, and not each in his own.
This is my dockerfile:
FROM debian
RUN apt update
RUN apt install postgresql-9.6 tomcat8 tomcat8-admin -y
RUN service postgresql start
RUN service postgresql status # says postgres is down
RUN su - postgres ;
RUN createdb db_example # fails !!!
RUN psql -c "CREATE USER springuser WITH PASSWORD 'test123';"
RUN exit
RUN service tomcat8 start
COPY target/App-1.0.war /var/lib/tomcat8/webapps/
CMD ["/bin/bash"]
The problem is that the database is down so I am uable to create the user and the database.
If I start the a debian docker container and do this steps per hand everything works fine.
Thanks for your help
All the recommendations in the comments are correct, it's better to keep services in different containers.
Nevertheless and just to let you know, the problem in the Dockerfile is that starting services in RUN statements is useless. For every line in the Dockerfile, docker creates a new image. For example RUN service postgresql start, it may start postgresql during docker build, but it doesn't persist in the final image. Only the filesystem persist from one step to another, not the processes.
Every process need to be started in the entrypoint, this is the only command that's called when you exec docker run:
FROM debian
RUN apt update
RUN apt install postgresql-9.6 tomcat8 tomcat8-admin -y
COPY target/App-1.0.war /var/lib/tomcat8/webapps/
ENTRYPOINT["/bin/bash", "-c", "service postgresql start && service postgresql status && createdb db_example && psql -c \"CREATE USER springuser WITH PASSWORD 'test123';\" && service tomcat8 start && sleep infinity"]
(It may have problems with quotes on psql command)
I have the problem hat in the war file the localhost for the database war hard coded.
Thanks to Light.G, he suggested me to use --net=host for the container, so now there is one container with the database and one with the tomcat server.
This are the steps I followed.
Build the docker image
docker build -t $USER/App .
Start a postgres database
We are using the host namespace it is not possible to run another programm on the post 5432.
Start the postgres container like this:
docker run -it --rm --net=host -e POSTGRES_USER='springuser' -e POSTGRES_DB='db_example' -e POSTGRES_PASSWORD='test123' postgres
Start the tomcat
Start the App container, with this command:
docker run -it --net=host --rm $USER/App
I have installed Docker in my system with odoo:latest and postgres:latest as a container, and i can successfully start & stop my odoo service.
But the problem is i can only see the base odoo modules in it instead i want to run my own created modules along with the base modules in the dockerized odoo.
I have searched many links but but failed to understand.
What should i do to run my own modules ?
Please help me with all the steps to it.
Thanks in advance.
The solution to this problem has been resolved as-
Firstly i mounted my local folder which contains my extra-addons by the command-
$ docker run -v /path/to/your/local/folder:/mnt/extra-addons -p 8069:8069 --name odoo --link db:db -t odoo
Then check weather your local folder is mounted on the odoo container
or not by-
$ docker exec -u root -it odoo /bin/bash
After logging-
$ ls /mnt/extra-addons
You should see your files which were present in your local/folder.
Now, its done just restart your docker odoo server
To stop-
$ sudo docker stop db
$ sudo docker stop odoo
$ sudo service docker stop
To Start-
$ sudo service docker start
$ sudo docker start db
$ sudo docker start -a odoo
Now you can install your modules from the app.
You just need to mount a folder from your host machine to the docker... go to docker hub and in the odoo image you will find how to mount your custom modules