Questions tagged [docker-swarm]

Part of the docker software suite to cluster docker servers into a single virtual service.

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16 views

Linking nodes in a cluster to run a single instance of a docker container

In this cluster, there are 11 identical nodes, each with 16gb of memory. So far, I've been able to connect each node of the cluster to a docker swarm hosted on the control node. My end goal is to run ...
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0answers
16 views

How can I allow admins to run Django Admin CLI commands against a Django application deployed live as part of a Docker Swarm cluster?

Specifically, I want them to run the following: https://django-q.readthedocs.io/en/latest/monitor.html I am looking to write a minimal wrapper-script which would simply allow them to run a single ...
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17 views

How can I make a docker swarm stack service that uses a “host” network to be defined in traefik through traefik's docker provider?

I have the following docker-compose-yaml file: version: '3.7' services: web: image: nginxdemos/nginx-hello:plain-text deploy: endpoint_mode: dnsrr labels: - "traefik....
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1answer
38 views

How to automatically update Swarm services when the Docker daemon restarts

I'm using Docker Swarm, and I have condition: always in the restart_policy of my compose file, so my services are started automatically when the system reboots or the Docker daemon is restarted. What ...
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3answers
76 views

How to get the next friendly name that Docker will assign to the container it will make?

Background When you start a Docker container as in the following example: $ docker run -ti ubuntu:latest Docker docker automatically assigns the container an ID and a friendly name. Docker ...
2
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1answer
49 views

Docker swarm container monitoring

I have been on a typical journey of: deploying software on a machine deploying software in a container deploying software using docker swarm The need for this journey is that swarm removes a large ...
3
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1answer
49 views

Access private DockerHub repo in Docker Swarm

I am trying to deploy a docker swarm using Digital Ocean's docker-machine driver. This is currently a single node that contains several public DockerHub images, and one private. I am having ...
1
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1answer
800 views

Docker container stuck in “new” state - Docker swarm - service stack

I am deploying a service stack to a Docker swarm like so: $ dt stack deploy --with-registry-auth -c tmp.stack.docker-compose.yml tmp Creating network tmp_my-network Creating service tmp_my-service $ ...
2
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1answer
69 views

How to properly manage mupltiple environmental variables with Gitlab CI and Docker Swarm?

In our project we are using Docker and we have multiple services with a pile of environmental variables (mostly credentials to various dbs, mail, samba, 30+ entries in total). It all worked well with ...
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1answer
42 views

Command returns 0.0.0.0 for IP but only for leader

I have a 3 node docker swarm cluster and I am trying to get the IPs of each one via docker node inspect node-1 --format '{{ .Status.Addr }}' but I am having an issue where when the node I am trying ...
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2answers
377 views

Why `docker stack` needs Docker to run in swarm mode? What are the implications when working on a single node?

I am experimenting with docker stack as a replacement to docker-compose. But I had the following message on my first deploy attempt: sudo docker stack deploy --compose-file stack/app-stack.yml app-...
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1answer
2k views

Docker stack deploy doesn't pull images

I'm launching through Ansible (just SSH basically) a docker stack deploy, the issue is also true when launching directly from a manager: docker stack deploy --prune --with-registry-auth -c /docker/...
2
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1answer
58 views

Docker Containers fails to DNS resolve on subnet 10.0.2.0/24

The ultimate problem I am facing is this: [root@527eb70c04c9 my-service]# ping google.com ping: google.com: Name or service not known Inside my container, I can't resolve public domains, although ...
2
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1answer
34 views

How to create a preemptable docker container?

Is there any way by which I can set a lifetime for a container after that much of time it should be stopped automatically and only awake when someone send a request. I wanted something like ...
4
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1answer
201 views

Will Docker Swarm work if masters are spread over 3 continents?

I need to deploy a highly available Docker Swarm on Azure. I created a VNet in 3 locations: Brazil South (my location), East US and West Europe. Then I enabled network peering so VMs in these ...
3
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1answer
749 views

How to get hostname from node-exporter in Docker Swarm?

I have setup my monitoring with the cadvisor, node-exporter, prometheus, grafana stack in my clustered environment using docker swarm. What is the easiest way to get my actual hostnames picked up by ...
4
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1answer
2k views

How to fix a “heartbeat failure” in Docker Swarm?

My cluster is currently located in a single data center. I've been trying to change that by adding a single worker node from another data center, but so far it hasn't worked. I'm able to make this ...
2
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1answer
239 views

How do I prevent service A from being placed in the same node as service B in Docker Swarm?

From the docs, I could only find information about placement restrictions based on node attributes, likes labels and its role. However, I couldn't find how to configure placement based on the services ...
1
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1answer
106 views

Executing a command in running docker swarm service

I am trying to run a Django project in docker swarm mode. The problem is I want to index the Elastic search container which needs to be run only after postgres completes the SQL dumping process (only ...
1
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1answer
39 views

Is it ok to logout after calling docker stack deploy?

If I immediately terminate the process that called docker stack deploy will the docker swarm continue? My use case is this: In my CI job I ssh into my swarm cluster node. I copy the new stack.yml ...
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1answer
254 views

Docker Swarm loop

I have written my own simple docker image. It works fine. Then I created my docker swarm with only two nodes a master and a slave and started a service with the following command: docker service ...
7
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1answer
2k views

Options to assign a static ip to a service running in docker swarm

Situation: docker swarm with 3+ nodes service running in the swarm with replicas=1 and restart=always swarm hosts have multiple interfaces - one for each vlan, with the same name service is deployed ...
1
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2answers
887 views

Join a Linux Docker swarm with a local Windows Docker for test purposes

I'm currenlty trying to connect/join a Linux Docker Swarm cluster with my Windows machine in order to test a stack without sending the stack over and over to my test cluster under Linux. My problem is ...
1
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1answer
736 views

Docker Swarm join-token not working

I am trying to add a new node into my swarm over the internet but it doesn't seem to connect through a proxy. I am trying to proxy using Caddy. The proxy configuration results in the same as for any ...
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0answers
83 views

How to avoid running on the same docker swarm node when healthcheck fails x times

Let's say I have the following setup: swarm-00: Manager swarm-01: Worker swarm-02: Worker Now I start a new nginx service docker service create --replicas 2 --health-cmd /check.sh --restart-max-...
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1answer
407 views

Error while trying to run docker redis image on Alpine Linux 3.7.0

Specifications Microsoft Windows [Version 10.0.14393] VirtualBox 5.2.8 Alpine Linux Extended 3.7.0 Docker Info Containers: 0 Running: 0 Paused: 0 Stopped: 0 Images: 1 Server Version: 17.10.0-ce ...
4
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1answer
100 views

Docker managers are losing quorum on AWS

I have deployed Docker EE on AWS by choosing the package directly from the AWS Marketplace: Docker EE for AWS (Standard/Advanced) - BYOL. The cluster has been successfully launched and deployed on AWS....
3
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1answer
5k views

Docker swarm replica stays 0/1 and service stays in status new

I have a problem with my docker swarm. I created a new service with the following command: docker-compose config | docker stack deploy -c - serviceNameX --with-registry-auth The docker-compose file ...
3
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0answers
2k views

Docker Swarm Service Health Check? [closed]

Docker Swarm provides a nice way to configure container health checks in the Docker file or a stack compose file. Health status of a container can be checked using docker inspect <container> or ...
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2answers
3k views

Docker MongoDB image - How to specify credentials other than in the compose file?

I'm using this docker image https://hub.docker.com/_/mongo/. That image provides a way of initializing a mongodb root database user with env variables which I can specify in the compose file as ...
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1answer
384 views

Windows Docker in swarm with Linux nodes connection issue

I have the following setup for my docker swarm: three Linux master nodes one Linux slave nodes Windows slave node They are connected with an overlay network. Within the linux nodes everything works ...
2
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1answer
292 views

Is a decentralized Docker swarm possible?

I want to run services in our office in containers. The problem I have is that we do not have a spare machine available to act as the dedicated host. So I am considering creating a swarm using ...
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2answers
162 views

Automated Docker swarm reinitialization and token distribution

Imagine you want to reset your Docker swarm from time to time. How do you distribute join tokens to those zillions of nodes? How much automation is possible here?
3
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2answers
78 views

How can secrets be distributed in a docker swarm?

Currently I use env and sql files so that docker compose can load secrets from there and build sql database docker instances with specific user/password. The question is, how can this be ported to ...
7
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1answer
905 views

Flask, Gunicorn and Docker Swarm

so I have this nice rest API implemented in Flask running in docker and I am thinking about scaling. This is how I progressed: CMD ["flask", "run", "--host=0.0.0.0"] and docker run -d -p 5000:5000 ...
4
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1answer
48 views

Strange orchestration behaviour of a Docker Swarm manager - pile of containers

For some unknown reason, the manager host which gets the command to launch a stack, tries to pile up all the containers on itself; other worker/manager hosts stay unemploed. Unfortunately there are ...
5
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2answers
2k views

Docker swarm join linux container Error - remote CA does not match fingerprint

Start docker swarm : docker swarm init --advertise-addr MANAGER-IP Join docker swarm: docker swarm join --token MANAGER-IP:2377 I am using Windows 10, it is working fine with Windows container mode,...
6
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2answers
1k views

How to Shutdown Docker Stack on Container Failure

Say I have several docker services using swarm defined as such: version : '3' services: server: image : my_server:latest deploy: replicas: 5 ...
1
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1answer
986 views

Docker daemon error on joining swarm node - could not find local IP address - unknown port

Consider the following setup: Three hosts in the same network: Host A - SLES Host B - Ubuntu Host C - Ubuntu Then, the following has worked: Init swarm on A Join swarm at B, make B a manager The ...
5
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2answers
259 views

Load balancing kubernetes cluster on budget KVM provider?

There are a lot of cheap KVM providers these days that offer simple nodes with just a single external IP per node, without any load balancing. What is a typical budget load balancing solution for ...
5
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1answer
194 views

Docker swarm stop spin up containers at 250

TLDR: Docker won't spin up more then 250 containers. I'm deploying a cluster of 3 docker services to a swarm with 2 nodes. 2 of the services need to contain 1 container (have a replicas: 1 in the ...
3
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1answer
313 views

In what all cases would one use an external load balancer over the Ingress routing mesh in a Docker cluster?

Also, would the routing mesh act as an application load balancer? Like for example, if I am having a Docker cluster in AWS, how does the ELB added to it, work? And how would that be different from ...
7
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1answer
912 views

Assign DNS name to Docker Swarm containers with public IPv6

I'm trying to understand how I would set up a Docker container (running in Swarm mode) with publicly available IPv6. I know Docker Swarm uses mesh routing, but I don't quite understand how I can ...
12
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2answers
502 views

Combine Docker Swarm and Kubernetes

My company is trying to play a little catch-up in the DevOps space. I have been doing a lot of research on containerization of applications and the orchestration systems that go with it. I came across ...