I am trying to connect a container with tomcat to a container with mysql in order to deploy an app. I have reproduced the same into a vagrant machine (tomcat 6, mysql 5.6) but now I want to do it using docker containers.
I used this answer here with some extra additions.
For the mysql container I run:
sudo docker run --name mysql -e MYSQL_USER=root -e MYSQL_ROOT_PASSWORD=admin -e MYSQL_DATABASE=my_database_name -d mysql:5.6
For the Tomcat container
docker run -d -p 8080:8080 --name tomcat --link mysql:mysql -v $PWD/webapp:/usr/local/tomcat/webapps tomcat:6
Also I have the folder webapp/with_my_app.war. So far so good.
This specific app needs some config in the WEB-INF/context.xml file, so I run
docker exec -it tomcat bash
Then I updated and installed vim and finally edit the context.xml file and restarted tomcat.
But I cannot access my app at localhost:8080/with_my_app
What am I missing?
Include --cap-add SYS_PTRACE while running tomcat container.
docker run -d -p 8080:8080 --cap-add SYS_PTRACE ......
Related
inside the volume of the docker container
I have been trying to export all my data from my local database to my docker container.
I created a volume "mydb" and I copy pasted the whole directory for the database "BookLook" from my local mysql server to the docker volume directory.
I am running my docker container with this command in manjaro linux:
docker run --name mysql-container -e MYSQL_ROOT_PASSWORD=password -v mydb:/var/lib/mysql -p 3306:3306 -d mysql:latest
still I am not being able to get the database when I am opening the mysql in the docker container
I am executing the docker container with the following command:
docker exec -it mysql-container bash
I am Running a MySQL Docker image and creating database and table. The container is lauched with the command:
docker run --network host -p 3306:3306 --name mysql -e MYSQL_ROOT_PASSWORD=root -d mysql/mysql-server
Spark is running on my host machine, So i want to write data from Spark into the database running in the container.
But the connection does not succeed and I am getting an Exception:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
You can try this 2 solutions:
Check if your connection URL is not wrong in your java file.
Check if your container accept connections that is not localhost of the container:
Go to your cmd and enter in the container:
docker exec -it containerID /bin/bash
install vim inside container apt install vim
vim /etc/mysql/mysql.conf.d/mysqld.cnf
comment bind-adress or make it listen to 0.0.0.0
exit from container
restart
Hope this help.
As Schwarz54 mentioned in his answer, it could be host issue.
I usually pass it at the time of initialising the container using the MYSQL_HOST parameter.
docker run --name mysql_5.7 -d -p 3306:3306 -e MYSQL_ROOT_PASSWORD=root1234 -e MYSQL_HOST=localhost mysql:5.7
I think you don't have to map the ports if you are running it on the host network.
docker run --name mysql_5.7 -d --network host -e MYSQL_ROOT_PASSWORD=root1234 -e MYSQL_HOST=localhost mysql:5.7
You can mount a local directory to the local container if you want the data to be persisted across container restarts using -v flag:
mkdir -p /Users/projects/data/mysql5.7
And mount this directory in the container at /var/lib/mysql
docker run --name mysql_5.7 -d --rm -p 3306:3306 -e MYSQL_ROOT_PASSWORD=root1234 -e MYSQL_HOST=localhost -v /Users/projects/data/mysql5.7:/var/lib/mysql mysql:5.7
I have problem with mysql-server container.
Post mysql with Exited(1) from docker has no solution for me included.
Here my workflow on windows 10.
0. Docker version:
Docker version 17.12.0-ce, build c97c6d6
1. My Dockerfile:
FROM mysql/mysql-server
ENV MYSQL_ROOT_PASSWORD root
ENV MYSQL_DATABASE blockchain
ENV MYSQL_USER block
ENV MYSQL_PASSWORD blockchain
COPY create_schema.sql /docker-entrypoint-initdb.d/create_schema.sql
EXPOSE 3306
Build command:
docker build -t mysqlserver .
Run command (option -d is used):
docker run -ti -p 3306:3306 --name mysqlserver1 -v C:/Users/user/sandbox/mysql:/var/lib/mysql -d --net testnetwork mysqlserver --innodb_use_native_aio=0
But result after start is: Exited (1) 11 minutes ago, declared path folder for database is initialized.
Where is my error ?
Thx for help
For mysql docker container, you need to specify the following parameters in your Dockerfile;
MYSQL_ROOT_PASSWORD
Initial Database to be created
Expose Port from the docker container to the host machine
For instance if you're creating the running mysql docker image using terminal, it could be: sudo docker run -e MYSQL_ROOT_PASSWORD=dev --name testdb -p 3800:3600 -d mysql:8.0.17
I need to develop docker in my application, i create docker image with maven-docker-plugin. After that I run sh script whit is here.
docker run --name app-mysql -e MYSQL_ROOT_PASSWORD=root -e MYSQL_DATABASE=app -d mysql
docker run --name app -p --link app-mysql:localhost -d app
docker run --name app-nginx -d -p 80:80 --link app:app nginx
docker exec app-nginx rm -rf /etc/nginx/conf.d/default.conf
docker cp app:/default.conf default.conf
docker cp default.conf app-nginx:/etc/nginx/conf.d/default.conf
docker restart app-nginx
But i have a problem. First mysql container runns good. Second, app container runns good. But nginx container throws error :
docker: Error response from daemon: Cannot link to a non running container: /app AS /app-nginx/app.
If i run this scrip with command
sleep 120
between the containers it setups normally, as i understand nginx container runs before app container finishes. Is there any way to run containers without sleep command as it is hardcoded. How can i figure if container finished successfully. Can you help me with solution?
I would prefer to use something like docker-compose for this. But you can still manage with your code. The key is not to start the container but create it first and then start it
docker run --name app-mysql -e MYSQL_ROOT_PASSWORD=root -e MYSQL_DATABASE=app -d mysql
docker run --name app -p --link app-mysql:localhost -d app
docker create --name app-nginx -d -p 80:80 --link app:app nginx
docker cp app:/default.conf app-nginx:etc/nginx/conf.d/default.conf
docker start app-nginx
Also the --link is deprecated and should not be used. You should be using docker network create to create a network and then assign that network to your containers using --net. docker-compose does a lot of these things automatically for you and that's why it makes more sense to use that instead
I pull the mysql/mysql-server image, then I execute the following commands below:
docker run --name myapp -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql/mysql-server
docker exec -it myapp bash
After this, I install jdk and tomcat in the newly created myapp container, then I exit the shell and run:
docker commit myapp myappwithjdk
Then I run the following, but the container exits immediately:
docker run -e MYSQL_ROOT_PASSWORD=my-secret-pw -d myappwithjdk
I don't know why it does this.
It could be leftovers from running mysql (like pid file). It is bad approach to use exec & commit for creating own container based on different one. Much better to create own image via Dockerfile:
FROM mysql/mysql-server
RUN <your commands here>
and then
docker build -t myappwithjdk .
The mysql image have the way to execute init scripts (both bash and sql) once on container creation. Simply put them to /docker-entrypoint-initdb.d/ folder:
FROM mysql:latest
ENV MYSQL_ROOT_PASSWORD=root
COPY 00-extra_env_setup.sh /docker-entrypoint-initdb.d/00-extra_env_setup.sh
COPY 01-user_setup.sql /docker-entrypoint-initdb.d/01-user_setup.sql
build:
docker build -t mymysql .
and run(note port exposing):
docker run -p 3306:3306 mymysql
now you able connect to it outside(change the ip to the ip of your docker server):
mysql --host 127.0.0.1 --port 3306 --user root --password
That's it!