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Questions tagged [docker-swarm]

Docker-swarm is a tool that is able to create a cluster of docker nodes and deploy containers in this cluster.

204 questions
78
votes
3 answers

How to use docker secrets without a swarm cluster?

Currently we im a running application on a single docker container, the application needs all sorts of sensitive data to be passed as environments variables, Im putting those on the run command so they don't end up in the image and then on a…
Juan Sebastian
  • 1,443
21
votes
2 answers

How to delete a docker network that does not exist?

I have a docker swarm configuration with 3 nodes. There is a network that sits on only one of the nodes. On that particular node, docker network ls shows the network, docker network rm [network-id] says "Error response from daemon: network ... not…
JRoppert
  • 321
21
votes
1 answer

List containers from all nodes of docker swarm mode

We are running docker in swarm mode on a few nodes. Could not find a quick and easy way to list all containers (preferably with status) in the swarm from the manager nodes. One can see overlay networks and locally-running containers attached to…
saabeilin
  • 449
16
votes
2 answers

docker swarm database connection reset by peer

I am running a spring boot application with docker swarm and I use postgres for database. When I run both of them as docker service, database connection fails consistently and randomly (as you can see on the timestamp) as the log…
Elifcan Mehekli
  • 193
13
votes
2 answers

How do you access a service that is in another stack?

I have a docker swarm configuration and in there I deployed two stacks (main and mon) I can expose a port in one stack and I can refer to it from another. However, I was trying to find a way of not doing that but instead have it access it using the…
Archimedes Trajano
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  • 23
13
votes
1 answer

What does --memory-reservation flag do in practice?

Docs say: Under this configuration, when the container consumes memory more than 200M and less than 500M, the next system memory reclaim attempts to shrink container memory below 200M. But what does this actually mean? Let's say I have a container…
Anentropic
  • 1,039
12
votes
1 answer

Using private physical networks with Docker swarm mode

I am working on a production setup with Docker in swarm mode (using Docker 17.03.1-ce). There will be 2 data centers involved. In both data centers, all machines have both a public IP and a private (local to data center) IP on a private network, so…
Ede
  • 231
8
votes
1 answer

What is HEALTHCHECK really used for when running Docker in swarm mode?

I'm having a hard time figuring out what HEALTHCHECK really is used for when running Docker in swarm mode. One place suggests that Docker will restart a task which is considered unhealthy. Another place explains that Docker will stop sending traffic…
sbrattla
  • 1,710
7
votes
1 answer

WEBRTC MCU/SFU inside kubernetes - Port Ranges?

I am using janus-gateway as a webrtc media server for group videocalling. Previously I had deployed it in a single node using docker-compose but now I want to be able to scale it horizontally. For this, I am trying to use kubernetes but I am facing…
Abdul Basit
  • 171
6
votes
1 answer

nginx in front of docker swarm services

I am thinking about how this is meant to be done in a serious way for weeks now and didn't come to a conclusion yet. Maybe I think into the wrong direction. Lets say you have a hundred web apps which come and go. You want an nginx configuration like…
sgohl
  • 1,363
6
votes
4 answers

How to set Linux capabilities on docker swarm mode service invocations

I'm looking into the notion of vault running under swarm (1.12.x). A single container would be started with: docker run -d --cap-add IPC_LOCK -p 8200:8200 -p 8215:8125 --name vault --volume /vagrant/vault:/vagrant/vault vault server…
volvox
  • 202
5
votes
1 answer

High Network I/O Between Docker Swarm Managers

Network Traffic We run Docker Swarm with 3 manager nodes and 16 worker nodes. The network I/O between two of the three manager nodes is very high. To illustrate this, here is the output from iftop for the three manager nodes: vm71 (10.0.0.131) vm71 …
nthdesign
  • 51
5
votes
3 answers

How to scale docker swarm dynamically

We have a docker container which can service only one request from user at a time. So, we want to scale up and down whenever there is a request from user. But in the docker swarm I can see only setting number of containers for a service as static by…
Uday Kiran Reddy
  • 159
4
votes
2 answers

Unable to access Wordpress site created as a Docker Stack

I am trying to create a Wordpress site inside a Docker stack composed of the following services: wordpress - the Wordpress site itself db - the MySQL container I have the following stack.yml file: version: '3.1' networks: abtehnic: services: …
Victor
  • 153
4
votes
2 answers

Docker-Swarm with RabbitMQ Autocluster

We are facing the following problem: How to run RabbitMQ in a Docker-Swarm with persistent Data. Currently we have the following setup in place: Docker-Swarm 3 Nodes GlusterFS as replicated Filesystem between all nodes RabbitMQ with Consul Image:…
opHasNoName
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