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Docker Swarm Filters, Constraint and Scheduling Strategy

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0

I am using Docker for Windows as well docker-ce on Ubuntu.

I have enable docker swarm mode.

• 
  

  I came across many article that specify that swarm has different strategy like binpacking, spread and we can see that in docker info command but I am not able to see it.

  
  
  

  • Also some of the article specify about different filters like affinity, resource , port and constraint. I am only able to see constraint in docker service command but not other.

  
  

  • How can we achieve like this service only run on node that node is running service with some specific name ? ( There are many scenario but this is one of them)

  
  

docker docker-swarm

share|improve this question

asked Mar 23 at 7:28

dotnetstepdotnetstep

11.6k43353

add a comment | 

0

I am using Docker for Windows as well docker-ce on Ubuntu.

I have enable docker swarm mode.

• 
  

  I came across many article that specify that swarm has different strategy like binpacking, spread and we can see that in docker info command but I am not able to see it.

  
  
  

  • Also some of the article specify about different filters like affinity, resource , port and constraint. I am only able to see constraint in docker service command but not other.

  
  

  • How can we achieve like this service only run on node that node is running service with some specific name ? ( There are many scenario but this is one of them)

  
  

docker docker-swarm

share|improve this question

asked Mar 23 at 7:28

dotnetstepdotnetstep

11.6k43353

add a comment | 

I am using Docker for Windows as well docker-ce on Ubuntu.

I have enable docker swarm mode.

• 
  

  I came across many article that specify that swarm has different strategy like binpacking, spread and we can see that in docker info command but I am not able to see it.

  
  
  

  • Also some of the article specify about different filters like affinity, resource , port and constraint. I am only able to see constraint in docker service command but not other.

  
  

  • How can we achieve like this service only run on node that node is running service with some specific name ? ( There are many scenario but this is one of them)

  
  

docker docker-swarm

share|improve this question

asked Mar 23 at 7:28

dotnetstepdotnetstep

11.6k43353

share|improve this question

asked Mar 23 at 7:28

dotnetstepdotnetstep

11.6k43353

share|improve this question

asked Mar 23 at 7:28

dotnetstepdotnetstep

11.6k43353

asked Mar 23 at 7:28

dotnetstepdotnetstep

11.6k43353

asked Mar 23 at 7:28

dotnetstepdotnetstep

11.6k43353

1 Answer
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A few things to clear up:

1. Swarm Mode only has one placement strategy, spread. You might be reading old articles about the "classic swarm" before Docker released the built-in Swarm Mode in mid-2016, which did support binpacking.


2. There are many ways to control container placement in swarm, which I cover at length in swarmmastery.com (paid course), and it includes (at least) placement constraints, placement preferences, global mode, and resource requirements. See the docs on those features here.


3. If you wanted to ensure two services were on the same node, the easiest way would be to place a "node label" on that node, and then create a placement constraint on the two services to match that label. This might be a bad idea if you want them both to fail over to a different node together if the first node fails. Swarm doesn't have a "pod" concept like Kubernetes so it doesn't have an easy way to guarantee two containers are always on a node together. For me, for things like php-fpm+nginx or codefusion+nginx I put them in a single image and use docker's example of supervisord to keep them together.

share|improve this answer

answered Mar 25 at 5:09

Bret FisherBret Fisher

4,27921526

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0

A few things to clear up:

1. Swarm Mode only has one placement strategy, spread. You might be reading old articles about the "classic swarm" before Docker released the built-in Swarm Mode in mid-2016, which did support binpacking.


2. There are many ways to control container placement in swarm, which I cover at length in swarmmastery.com (paid course), and it includes (at least) placement constraints, placement preferences, global mode, and resource requirements. See the docs on those features here.


3. If you wanted to ensure two services were on the same node, the easiest way would be to place a "node label" on that node, and then create a placement constraint on the two services to match that label. This might be a bad idea if you want them both to fail over to a different node together if the first node fails. Swarm doesn't have a "pod" concept like Kubernetes so it doesn't have an easy way to guarantee two containers are always on a node together. For me, for things like php-fpm+nginx or codefusion+nginx I put them in a single image and use docker's example of supervisord to keep them together.

share|improve this answer

answered Mar 25 at 5:09

Bret FisherBret Fisher

4,27921526

add a comment | 

0

A few things to clear up:

1. Swarm Mode only has one placement strategy, spread. You might be reading old articles about the "classic swarm" before Docker released the built-in Swarm Mode in mid-2016, which did support binpacking.


2. There are many ways to control container placement in swarm, which I cover at length in swarmmastery.com (paid course), and it includes (at least) placement constraints, placement preferences, global mode, and resource requirements. See the docs on those features here.


3. If you wanted to ensure two services were on the same node, the easiest way would be to place a "node label" on that node, and then create a placement constraint on the two services to match that label. This might be a bad idea if you want them both to fail over to a different node together if the first node fails. Swarm doesn't have a "pod" concept like Kubernetes so it doesn't have an easy way to guarantee two containers are always on a node together. For me, for things like php-fpm+nginx or codefusion+nginx I put them in a single image and use docker's example of supervisord to keep them together.

share|improve this answer

answered Mar 25 at 5:09

Bret FisherBret Fisher

4,27921526

add a comment | 

A few things to clear up:

1. Swarm Mode only has one placement strategy, spread. You might be reading old articles about the "classic swarm" before Docker released the built-in Swarm Mode in mid-2016, which did support binpacking.


2. There are many ways to control container placement in swarm, which I cover at length in swarmmastery.com (paid course), and it includes (at least) placement constraints, placement preferences, global mode, and resource requirements. See the docs on those features here.


3. If you wanted to ensure two services were on the same node, the easiest way would be to place a "node label" on that node, and then create a placement constraint on the two services to match that label. This might be a bad idea if you want them both to fail over to a different node together if the first node fails. Swarm doesn't have a "pod" concept like Kubernetes so it doesn't have an easy way to guarantee two containers are always on a node together. For me, for things like php-fpm+nginx or codefusion+nginx I put them in a single image and use docker's example of supervisord to keep them together.

share|improve this answer

answered Mar 25 at 5:09

Bret FisherBret Fisher

4,27921526

share|improve this answer

answered Mar 25 at 5:09

Bret FisherBret Fisher

4,27921526

answered Mar 25 at 5:09

Bret FisherBret Fisher

4,27921526

answered Mar 25 at 5:09

Bret FisherBret Fisher

4,27921526