I try to run Traefik on docker on Windows native container but I don't find any exemple. I just want to run the Getting Started exemple with whoami.
I try many parameters without success. I have two question :
how to to pass a configuration file for traefik with an Windows Container ? (binding file don't work on Windows)
how to connect to docker host with named pipe ?
Exemple of docker compose I've tried :
version: '3.7'
services:
reverse-proxy:
image: traefik:v1.7.2-nanoserver # The official Traefik docker image
command: --api --docker --docker.endpoint=npipe:////./pipe/docker_engine # Enables the web UI and tells Træfik to listen to docker
ports:
- "80:80" # The HTTP port
- "8080:8080" # The Web UI (enabled by --api)
volumes:
- source: '\\.\pipe\docker_engine'
target: '\\.\pipe\docker_engine'
type: npipe
whoami:
image: emilevauge/whoami # A container that exposes an API to show its IP address
labels:
- "traefik.frontend.rule=Host:whoami.docker.localhost"
Traefik dashboard work fine on 8080 but no provider found and whoami container not found.
I'm with Windows 10 1803, Docker version 18.06.1-ce, build e68fc7a, docker-compose version 1.22.0, build f46880fe
Note that Traefik work fine if I launch it on my Windows (not in a container).
Thank you for help.
There is a working example of it here. If you would like to run it in swarm, try using docker network create and docker service create instead of docker stack deploy. See my question here for more details.
Related
I have a Java application running in a Docker container and rabbitmq in another container.
How can I connect the containers to use rabbitmq in my Java application?
You have to set up a network and attach the running containers to the network.
Then you have to set the connection URL of your app to the name of the rabbitmq's network name in Docker container.
The easiest way is to create docker-compose file because it will create the network and attach the containers automatically.
Create a network
Connect the container
Or
Docker compose file
Example of docker-compose.yml
version: '3.7'
services:
yourapp:
image: image_from_dockerhub_or_local // or use "build: ./myapp_folder_below_this_where_is_the_Dockerfile" to build container from scratch
hostname: myapp
ports:
- 8080:8080
rabbitmq:
image: rabbitmq:3.8.3-management-alpine
hostname: rabbitmq
environment:
RABBITMQ_DEFAULT_USER: user
RABBITMQ_DEFAULT_PASS: pass
ports:
- 5672:5672
- 15672:15672
You can run it with docker-compose up command.
Then in your connection url use host:rabbitmq, port:5672.
Note that you don't have to create a port forward if you don't want to reach rabbitmq from your host machine.
I created a Gitlab CI CD pipline with the gitlab runner and gitlab itself.
right now everything runs besides one simple script.
It does not copy any files to the volume.
I'm using docker-compose 2.7
I also have to say, that I'm not 100% sure about the volumes.
Here is an abstract of my .gitlab-ci.yml
stages:
- build_single
- test_single
- clean_single
- build_lb
- test_lb
- clean_lb
Build_single:
stage: build_single
script:
- docker --version
- docker-compose --version
- docker-compose -f ./NodeApp/docker-compose.yml up --scale slave=1 -d
- docker-compose -f ./traefik/docker-compose_single.yml up -d
- docker-compose -f ./DockerJMeter/docker-compose.yml up --scale slave=10 -d
When I'm using ls, all the files are in the correct folder.
Docker-compose:
version: '3.7'
services:
reverse-proxy:
# The official v2.0 Traefik docker image
image: traefik:v2.0
# Enables the web UI and tells Traefik to listen to docker
command: --api.insecure=true --providers.docker
ports:
# The HTTP port
- "7000:80"
# The Web UI (enabled by --api.insecure=true)
- "7080:8080"
volumes:
# So that Traefik can listen to the Docker events
- /var/run/docker.sock:/var/run/docker.sock
- ./traefik/config_lb:/etc/traefik
networks:
- default
networks:
default:
driver: bridge
name: traefik
For JMeter I'm using the copy statement to get the configuration files after it startet. but for traefik I need the files on the booting process for traefik.
I thought ./traefik/config_lb:/etc/traefik with a '.' in front of traefik creates a path in respect to the docker-compose file.
Is this wrong?
I also have to say, that gitlab and the runner are both dockerized on the host system. So the instanz of docker is running on the host system, and gitlab-runner also using the docker.sock.
Best Regards!
When you use the gitlab-runner in a docker container, it starts another container, the gitlab-executor based on an image that you specify in .gitlab-ci.yml. The gitlab-runner uses the docker sock of the docker host (see /var/run/docker.sock:/var/run/docker.sock in /etc/gitlab-runner/config.toml) to start the executor.
When you then start another container using docker-compose, again the docker sock is used. Any source paths that you specify in docker-compose.yml have to point to paths on the docker host, otherwise the destination in the created service will be empty (given the source path does not exist).
So what you need to do is find the path to traefik/config_lb on the docker host and provide that as the source.
How do I dynamically add container ip in other Dockerfile ( I am running two container a) Redis b) java application .
I need to pass redis url on run time to my java arguments
Currently I am manually checking the redis ip and copying it in Dockerfile. and later creating new image using redis ip for java application.
docker run --name my-redis -d redis
docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' my-redis
IN Dockerfile (java application)
CMD ["-Dspring.redis.host=172.17.0.2", "-jar", "/apps/some-0.0.1-SNAPSHOT.jar"]
Can I use any script to update the DockerFile or can use any environment variable.
you can assign a static ip address to your dokcer container when you run it, following the steps:
1 - create custom network:
docker network create --subnet=172.17.0.0/16 redis-net
2 - run the redis container to use the specified network, and assign the ip address:
docker run --net redis-net --ip 172.17.0.2 --name my-redis -d redis
by then you have the static ip address 172.17.0.2 for my-redis container, you don't need to inspect it anymore.
3 - now it is possible to run the java appication container but it must use the same network:
docker run --net redis-net my-java-app
of course you can optimize the solution, by using env variables or whatever you find convenient to your setup.
More infos can be found in the official docs (search for --ip):
docker run
docker network
Edit (add docker-compose):
I just find out that it is also possible to assign static ips using docker-compose, and this answer gives an example how.
This is a similar example just in case:
version: '3'
services:
redis:
container_name: redis
image: redis:latest
restart: always
networks:
vpcbr:
ipv4_address: 172.17.0.2
java-app:
container_name: java-app
build: <path to Dockerfile>
networks:
vpcbr:
ipv4_address: 172.17.0.3
depends_on:
- redis
networks:
vpcbr:
driver: bridge
ipam:
config:
- subnet: 172.17.0.0/16
gateway: 172.17.0.1
official docs: https://docs.docker.com/compose/networking/
hope this helps you find your way.
You should add your containers in the same network . Then at runtime you can use that name to refer to the container with its name. Container's name is the host name in the network. Thus at runtime it will be resolved as container's ip address.
Follow these steps:
First, create a network for the containers:
docker network create my-network
Start redis: docker run -d --network=my-network --name=redis redis
Edit java application's Dockerfile, replace -Dspring.redis.host=172.17.0.2" with -Dspring.redis.host=redis" and build again.
Finally start java application container: docker run -it --network=my-network your_image. Optionally you can define a name for the container, but it is not required as you do not access java application's container from redis container.
Alternatively you can use a docker-compose file. By default docker-compose creates a network for running services. I am not aware of your full setup, so I will provide a sample docker-compose.yml that illustrates the main concept.
version: "3.7"
services:
redis:
image: redis
java_app_image:
image: your_image_name
In both ways, you are able to access redis container from java application dynamically using container's hostname instead of providing a static ip.
I'd like my web Docker container to access Redis on 127.0.0.1:6379 from within the web container. I've setup my Docker Compose file as the following. I get ECONNREFUSED though:
version: "3"
services:
web:
build: .
ports:
- 8080:8080
command: ["test"]
links:
- redis:127.0.0.1
redis:
image: redis:alpine
ports:
- 6379
Any ideas?
The short answer to this is "don't". Docker containers each get their own loopback interface, 127.0.0.1, that is separate from the host loopback and from that of other containers. You can't redefine 127.0.0.1, and if you could, that would almost certainly break other things.
There is a technically possible way to do it by either running all containers directly on the host, with:
network_mode: "host"
However, that removes the docker network isolation that you'll want with containers.
You can also attach one container to the network of another container (so they have the same loopback interface) with:
docker run --net container:$container_id ...
but I'm not sure if there's a syntax to do this in docker-compose and it's not available in swarm mode since containers may run on different nodes. The main use I've had for this syntax is attach network debugging tools like nicolaka/netshoot.
What you should do instead is make the location of the redis database a configuration parameter to your webapp container. Pass the location in as an environment variable, config file, or command line parameter. If the web app can't support this directly, update the configuration with an entrypoint script that runs before you start your web app. This would change your compose yml file to look like:
version: "3"
services:
web:
# you should include an image name
image: your_webapp_image_name
build: .
ports:
- 8080:8080
command: ["test"]
environment:
- REDIS_URL=redis:6379
# no need to link, it's deprecated, use dns and the network docker creates
#links:
# - redis:127.0.0.1
redis:
image: redis:alpine
# no need to publish the port if you don't need external access
#ports:
# - 6379
Hi I am new to docker I have created docker images and able to start them using docker compose.
Able to access these services from browser using docker tcp IP and they can ping each other using ping command.
When I tried to access the service from one another using service name in docker compose it is not accessible.
Is it a firewall issue?But both the services can be accessible from browser.
Tried by creating network when I try to inspect network both containers are in same network and they can ping each other.
These are my docker files
backendservice
FROM java:8
EXPOSE 8080
ADD /target/microService.jar microService.jar
ENTRYPOINT ["java","-jar","microService.jar"]
uiservice
FROM java:8
EXPOSE 8081
ADD /target/csuiservice.war csuiservice.war
ENTRYPOINT ["java","-jar","csuiservice.war"]
Using spring boot to develop above services and they able to access independently on exposed ports
docker-compose.yml
version: '3'
services:
backendservice:
build:
./BAService
volumes:
- ./BAService:/usr/src/app
ports:
- 5001:8080
website:
image: uiservice
ports:
- 5000:8081
links:
- "backendservice:backendservice"
volumes:
- ./spring-boot-web-jsp:/usr/src/app1
depends_on:
- backendservice
networks:
default:
external:
name: mynetwork
I am trying to access the backendservice by following url
"http://backendservice:8080/getUsers"