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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.

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Docker Network: Public IP for Swarm Scope

My goal is to serve different docker services using different IPs of my host: 10.10.10.40:8888 -> DockerSwarmService1 10.10.10.41:8888 -> DockerSwarmService2 Using normal bridge networks, that is ...
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20 views

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] ...
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28 views

How to access database on Docker swarm without exposing ports to internet?

I had a really hard time coming up with a short and descriptive title for this... Let me explain: In classic Docker (no swarm mode) I had my system set up in a way that my PostgreSQL database would ...
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+100

Docker UDP 'response'

Simply put, I have 2 containers for a service in a swarm mode. Container receives udp packets and sends them back to multiple clients, which ip's and ports are stored in db. Load-balancing: packets ...
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1answer
32 views

Docker swarm, all containers get restarted

We are running Docker swarm mode in production, having 4 nodes, 3 of them share the manager status. We've noticed that once in a few days all the containers on one of the hosts are got restarted. I'...
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10 views

How does actual available memory impact memory reservations?

Let's assume you have a single node cluster, with 2 CPUs and 1GB of RAM. The host OS is currently consuming 300MB RAM You deploy a single 1-replica service in this cluster with a CPU reservation for ...
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9 views

Docker Swarm mesh ports limit only to worker nodes?

I am trying out current release of Docker Swarm as a solution for easy deployment of our application. One concern we have is manager nodes security, so we try to separate them as much as possible. And ...
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1answer
70 views

Docker hybrid swarm mesh routing not workingwindows

Windows Version: Server 2019 Docker for Windows Version: 18.09.0 Linux Version: Ubuntu 18.04.1 LTS Linux Node Docker Version: 18.09.0 Issue: Ingress routing between nodes in hybrid (linux/windows) ...
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14 views

What is the best way to run scripts inside a container during deployment?

I often need to run commands inside the one of the containers (tasks) for a Docker Swarm service during deployment. One example of this is drush commands when deploying Drupal sites. I build and ...
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2answers
129 views

ubuntu 18.04 docker swarm ipv6

Unfortunately I am not able to dump configs in here so I will attempt to describe. I have a docker compose file, when I do a docker up on it things work fine. However, when I start it with docker ...
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1answer
166 views

Reverse Proxy for Docker Swarm with Dynamic Ports

I have the following set up: Docker swarm with 1 master and 2 workers. Portainer service that manages the swarm. A web app that is using nginx that runs on the master machine. I want to use nginx ...
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16 views

Assign Swarm worker node to specific dns address

We want worker nodes in our swarm cluster to be assigned to specific dns addresses. We require a single container of a our backend to run on a single node using mode: global as opposed to replicas in ...
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1answer
129 views

Unable to use a Nexus Docker Registry in a Docker Swarm

I am trying to set up a Nexus repository for use by a Docker Swarm. However, I am seeing some weird behaviour and I am not sure if it is something I did or if it is a bug because it appears to be ...
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1answer
21 views

Can hosts join (i.e. be part of) more than one docker swarm?

It may sound a naive question, but I haven't found it stated anywhere: is there a way to use the same machines to run different service stacks? e.g. having Stack A: service X, service Y Stack B: ...
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257 views

Docker Swarm - Awaiting healthy status in classic node inventory

I get Awaiting healthy status in classic node inventory on a Windows Worker Node even though if I look from the Manager Node I see Status = Ready and Availability = Active docker info looks ok with ...
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1answer
213 views

How to connect Docker Swarm services to an ordinary Docker network?

I have a single small VPS that has a variety of services on it, such as a WordPress installation and a few web apps. For some while I have run all the services on it as Docker containers. Since I have ...
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372 views

Deploying a php/laravel app with nginx in Docker swarm yields blank page and no errors

I have a Laravel application which I plan to deploy on a Docker Swarm. The problem is that no matter what I do I get a blank page when calling localhost/index.php. I'm using 2 separate services for: ...
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245 views

Slow docker overlay network between physical sites

Running a docker swarm on the same subnet interconnected on two physical networks via a fibre link. One of them is 10Gbps, and the other 1Gbps. As so: -------------------------------- | | Site A, ...
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1answer
186 views

How do I list Docker VIP addresses?

I can list all container IP address inside a docker overlay network using: ~# docker network inspect <network_id> I'm trying to do resolver troubleshooting in some Docker swarm stack. It seems ...
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162 views

Swarm Shared Volumes in Azure with Cloudstor

I'm facing some issues with Docker Swarm volumes using Cloudstore Driver (on azure), when we try to update a docker service after the successful creation of it, the update fails with: ""Error ...
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156 views

Docker cannot route OpenVPN clients to stack containers

I have a docker cluster with an OpenVPN container as an access server and a dns container as a forwarder. All containers are connected to a docker overlay network called vpn, but some run as a docker ...
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1answer
1k views

How to serve static contents through Traefik

I currently have a docker setup in which one nginx container serves static contents for a number of wordpress sites and proxies dynamic requests to the respective php-apache containers. When I deploy ...
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94 views

DigitalOcean swarm between regions

Im asking this on StackOverflow but maybe on ServerFault it will be better I'm building docker swarm cluster for my backend and wanna join nodes from different regions for example manager on NY1 and ...
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1answer
356 views

Docker Error creating external connectivity network

i am trying to deploy a portainer/agent stack with the recommended docker compose configuration as suggested in the official documentation (https://portainer.readthedocs.io/en/stable/agent.html), and ...
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1answer
100 views

Docker Stack Deploy Does Not Work

i am trying to deploy a stack to my docker swarm but it does not work. i call the command sudo docker stack deploy -c docker-compose.yml server-test but it gives me the error unsupported Compose ...
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1answer
41 views

if i scale up a service with a bind volume , Docker swarm will create a new bind volume in the second machine ?

I created a service in docker swarm with a bind volume in specific path. If i scale up , will docker create a new service with a new bind volume (with same path) in the second machine?
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64 views

Docker Swarm Mesh not working on mixed Win7 / Linux cluster

I've got a mixed Docker Swarm Cluster with Linux machines and Win7 machines running VirtualBox via NAT (bridged option is not allowed). Win7 Win7 | | (port forwarding on ...
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65 views

docker node ls is showing only master node in Azure

I have created container environment in Azure. However, while running docker node ls, it is only showing LEADER node. but not showing agent node here. Please help. Thanks
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129 views

Elasticsearch docker containers in a swarm cannot connect to master until they fail and restart

I am trying to setup an ELK stack in a swarm. Just to start I have one of each node type. A master, client, ingest, and data. The master node launches but each of the other nodes cannot find the ...
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1answer
68 views

Nagios Docker Stack Plugin works locally but not remote

I have a plugin to check the services running on docker. I've gone through all of the suggestions from the dozens of posts I have seen here, but I'm still not able to get this to work. The commands ...
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1answer
65 views

Differentiate docker swarm services by deployment target

I'm in the process of rolling out a High Availability docker swarm setup across multiple data centers, but I have a bit of a high-level question about configuration differentiation. Say I have a ...
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11 views

How do you update managed plugins in docker across all nodes of a swarm?

To update plugins in Docker I use the following sequence docker plugin disable -f $PLUGIN && \ docker plugin upgrade --grant-all-permissions $PLUGIN && \ docker plugin enable $PLUGIN ...
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Direct requests only to one container of the docker swarm service

Is it possible to cause docker load balancer which uses round robin to direct requests only one container of global docker service deployed on multiple hosts? If this container goes down, requests ...
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1answer
1k views

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 ...
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43 views

Overlay Network on Windows Server 2016 for WSFC + SQL Server HA

I'm trying to create an Overlay Network on Windows Server 2016 to create a separate address space for Windows Server Failover Clustering (WSFC). This cluster will eventually be used to host a SQL ...
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1answer
262 views

how docker handles high availability

Coming from a VMware environment, my through process was that, Multiple Docker machines (swarm), mount the same NFS data stores A container (e.g. Maria dB) is deployed on the Docker swarm If a node ...
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94 views

How to close outgoing conections from docker container in swarm?

With stand alone containers I do smomething like that: Create bridge with options com.docker.network.bridge.name and com.docker.network.bridge.enable_ip_masquerade like: docker network create \ --...
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2answers
401 views

Zero Down Time deployment Node.js Docker

I have a React/Node.js application running on a single server using docker-compose. I'm trying to achieve a 0 downtime deployment for my react app. The process right now, does a webpack build (...
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56 views

A Docker container for each MySQL install

I'm looking to move the databases for my Wordpress sites to their own serve. My question is, for each site, should I run a separate docker container with it's own MySQL install, or is that overkill? ...
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1answer
432 views

Howto use a docker/swarm secret value as an environment variable in “docker service create”?

I need to write scripts that create services on docker swarm clusters. An example script would be simiar to this: docker service create \ --name postgres \ --mode global \ --constraint "...
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1answer
85 views

How can I expose the docker tcp api to the private container network?

I'd like one of my containers to be able to control docker itself, the way I'm currently doing it is by simply exposing the socket internally, but I don't like this. What I'd really like to do is do ...
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142 views

How does load balancing / VIP works with overlay networks?

I'm trying to understand how the built-in Docker load balancing / VIP works with overlay networks. To better explain how I understand this, I've put together a diagram. My hope is that someone can ...
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1answer
926 views

Docker container unable to connect to MongoDB Replica set

I'm using Docker Swarm to create a cluster of web applications and databases. I've four containers running, three of them are a single mongodb replica set and the last is a asp.net core application ...
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1answer
316 views

Monitoring and restarting docker container (docker-compose)

I'm looking into ways of deploying, monitoring and restarting (in cause of failure) my docker containers with docker-compose, but I can't find anything else than using swarm. Not that swarm is bad, ...
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1answer
977 views

Docker Swarm free to use? can be used in production for free? [duplicate]

I am a beginner so asking this silly question. Is docker swarm free to use for building cluster of docker containers? i heard it is $15/hr ? We can use swarm in production without paying anything? any ...
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657 views

Docker Issue - exit status 34

I am facing "exit status 34" while creating docker service. please suggest what is the issue. Docker version : Docker version 17.09.1-ce, build 19e2cf6 Error Log :nsenter: failed to unshare ...
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1answer
27 views

Replicating folders in docker cluster

So I am quite new to docker, and in particular docker swarm. I've just installed jenkins and I want it to work on all nodes regardless of it running with only one instance on one machine or 10 ...
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333 views

Automatically login on Amazon ECR with Docker Swarm

We have Docker images hosted on Amazon ECR and the goal is to run them on EC2 instances using Docker Swarm. The services are configured in global mode so that they are automatically replicated on new ...
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1answer
1k views

Publish Docker Swarm services on specific IP addresses

On Centos 7.4 I am setting up a swarm where I want to run multiple routers all reachable on port 80/443. The purpose is to host multiple environment (test/staging...) on a single swarm, all ...
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1answer
115 views

cant docker swarm on google cloud platform work

I am trying to configure a sample docker swarm to work on my microservices on google cloud platform. The problem is when I finished following the steps in pluralsight, I cant access the service from ...