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Add kubernetes support to docker/cli #721

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merged 17 commits into from Jan 3, 2018

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silvin-lubecki commented Nov 30, 2017

This PR introduces docker stack support for kubernetes in the docker cli using the docker compose controller embedded in docker4mac beta.

  • Adds a new orchestrator config field, a new --orchestrator and a DOCKER_ORCHESTRATOR environment variable to switch between swarm and kubernetes orchestrators.
    {
      // […]
      "credsStore": "osxkeychain",
      "orchestrator": "kubernetes"
    }
    
  • When in kubernetes mode:
    • adds a --namespace on stack subcommands to be able to point to the correct kubernetes namespace
    • adds a --kubeconfig flag to stack subcommands — and take KUBECONFIG environment variable into account — to be able to point to a kubernetes cluster using the kubernetes configuration file.
    • --filter on docker stack services are disabled.
    • orchestrator commands like secret, service, config, node will error out because they are not implemented yet (it's on the way, but won't be present in this PR)

This adds new kubernetes and swarm annotation to define if a command/flag is supported by one of the other (or both).

All of this is marked experimental (thus we depend on #758 for this one to get merged)

🦁

:tada:

Signed-off-by: Vincent Demeester vincent@sbr.pm
Signed-off-by: Silvin Lubecki silvin.lubecki@docker.com

@vdemeester vdemeester requested review from vieux, simonferquel and thaJeztah Nov 30, 2017

@vdemeester vdemeester changed the title from Add kubernetes support to docker/cli for master/pinata to Add kubernetes support to docker/cli Nov 30, 2017

@GordonTheTurtle GordonTheTurtle removed the dco/no label Nov 30, 2017

@docker docker deleted a comment from GordonTheTurtle Nov 30, 2017

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codecov-io Dec 1, 2017

Codecov Report

Merging #721 into master will decrease coverage by 2.56%.
The diff coverage is 13.04%.

@@            Coverage Diff            @@
##           master    #721      +/-   ##
=========================================
- Coverage   53.46%   50.9%   -2.57%     
=========================================
  Files         218     237      +19     
  Lines       14642   15338     +696     
=========================================
- Hits         7829    7808      -21     
- Misses       6327    7028     +701     
- Partials      486     502      +16

codecov-io commented Dec 1, 2017

Codecov Report

Merging #721 into master will decrease coverage by 2.56%.
The diff coverage is 13.04%.

@@            Coverage Diff            @@
##           master    #721      +/-   ##
=========================================
- Coverage   53.46%   50.9%   -2.57%     
=========================================
  Files         218     237      +19     
  Lines       14642   15338     +696     
=========================================
- Hits         7829    7808      -21     
- Misses       6327    7028     +701     
- Partials      486     502      +16
Show outdated Hide outdated cli/command/orchestrator/orchestrator.go Outdated
Show outdated Hide outdated cli/command/orchestrator/orchestrator.go Outdated
Show outdated Hide outdated ...d/stack/kubernetes/api/client/clientset_generated/clientset/clientset.go Outdated
Show outdated Hide outdated ...command/stack/kubernetes/api/client/clientset_generated/clientset/doc.go Outdated
Show outdated Hide outdated e2e/orchestrator/version_test.go Outdated
Show outdated Hide outdated vendor.conf Outdated
Show outdated Hide outdated cli/command/orchestrator/orchestrator.go Outdated
Show outdated Hide outdated cli/command/stack/cmd.go Outdated
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dnephin Dec 1, 2017

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For directory structure, how about this:

Move non-generated code out of the generated code tree:

git mv cli/command/stack/kubernetes/api/labels cli/command/stack/kubernetes/labels

Move generated code out of the cli/command tree

mkdir kubernetes
git mv cli/command/stack/kubernetes/api kubernetes/api

Add a README to the kubernetes/api package that explains:

  • this is a client library for x
  • this code is generated from a spec that is not available
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dnephin commented Dec 1, 2017

For directory structure, how about this:

Move non-generated code out of the generated code tree:

git mv cli/command/stack/kubernetes/api/labels cli/command/stack/kubernetes/labels

Move generated code out of the cli/command tree

mkdir kubernetes
git mv cli/command/stack/kubernetes/api kubernetes/api

Add a README to the kubernetes/api package that explains:

  • this is a client library for x
  • this code is generated from a spec that is not available
Show outdated Hide outdated cli/command/stack/cmd.go Outdated
Show outdated Hide outdated cli/command/stack/cmd.go Outdated
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AkihiroSuda Dec 2, 2017

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It might be helpful to add logrus.Warn("DOCKER_ORCHESTRATOR=kubernetes is not supported for this command") to docker service and docker node?

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AkihiroSuda commented Dec 2, 2017

It might be helpful to add logrus.Warn("DOCKER_ORCHESTRATOR=kubernetes is not supported for this command") to docker service and docker node?

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vieux Dec 4, 2017

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@vdemeester once the CI is green, could we maybe split the PR in 3 commits: vendor, generated code and actual new code ?

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vieux commented Dec 4, 2017

@vdemeester once the CI is green, could we maybe split the PR in 3 commits: vendor, generated code and actual new code ?

@n4ss

First step of review on this big PR.

Congrats for the work 👏

Show outdated Hide outdated cli/command/orchestrator.go Outdated
Show outdated Hide outdated cli/command/orchestrator.go Outdated
Show outdated Hide outdated cli/command/orchestrator.go Outdated
)
flags := cmd.PersistentFlags()
flags.String("namespace", "default", "Kubernetes namespace to use")

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n4ss Dec 4, 2017

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It'd probably be cleaner to have those flags in a stackOptions struct

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n4ss Dec 4, 2017

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It'd probably be cleaner to have those flags in a stackOptions struct

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Can't do that one, given how cobra works, we can just use PersistentFlags().Changed("namespace") for those.

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Can't do that one, given how cobra works, we can just use PersistentFlags().Changed("namespace") for those.

Show outdated Hide outdated cli/command/stack/kubernetes/cli.go Outdated
}
// Parse the compose file
stack, cfg, err := LoadStack(opts.Namespace, opts.Composefile)

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n4ss Dec 4, 2017

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We have stack and stacks variables where one is not the subset of the other, it's kinda confusing.

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n4ss Dec 4, 2017

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We have stack and stacks variables where one is not the subset of the other, it's kinda confusing.

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😝

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😝

return err
}
if in, err := stacks.Get(stack.Name, metav1.GetOptions{}); err == nil {

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n4ss Dec 4, 2017

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You also may want to rename in to stackObject or something more explicit.

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n4ss Dec 4, 2017

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You also may want to rename in to stackObject or something more explicit.

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n4ss Dec 4, 2017

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Also the Get call might fail for other reasons than the stack.Name not being referenced. Worth adding a test on the error value before trying a stacks.Create?

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n4ss Dec 4, 2017

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Also the Get call might fail for other reasons than the stack.Name not being referenced. Worth adding a test on the error value before trying a stacks.Create?

Show outdated Hide outdated cli/command/stack/kubernetes/loader.go Outdated
for k, v := range svc.Environment {
env[k] = v
}
parsed["services"].(iMap)[svc.Name].(iMap)["environment"] = env

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n4ss Dec 4, 2017

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Should we have some form of checking of key presence in the successive maps?

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n4ss Dec 4, 2017

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Should we have some form of checking of key presence in the successive maps?

for _, value := range env {
parts := strings.SplitN(value, "=", 2)

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n4ss Dec 4, 2017

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We should have length checking here too.

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n4ss Dec 4, 2017

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We should have length checking here too.

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Well, it comes from os.Environ so.. it will always have the = I think. That said, this whole file should go away in a follow up

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Well, it comes from os.Environ so.. it will always have the = I think. That said, this whole file should go away in a follow up

Show outdated Hide outdated cmd/docker/docker.go Outdated
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@vieux we could do that yes 👼 I just want to keep the separate commit for now (waiting for at least 2 LGTMs) to ease reviews 👼

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vdemeester commented Dec 5, 2017

@vieux we could do that yes 👼 I just want to keep the separate commit for now (waiting for at least 2 LGTMs) to ease reviews 👼

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@vdemeester @silvin-lubecki does this work only for docker stack command ? If yes, isnt it confusing to have an environment variable DOCKER_ORCHESTRATOR and it is applicable only to a subset of orchestration commands, while other commands such as docker node, docker service still be routed to the default swarm orchestrator ?
Given that this is a fix for a specific command, why cant this option be added to the docker stack deploy command clearly indicating the fact that this is a client only functionality specific to the stack command ?

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mavenugo commented Dec 5, 2017

@vdemeester @silvin-lubecki does this work only for docker stack command ? If yes, isnt it confusing to have an environment variable DOCKER_ORCHESTRATOR and it is applicable only to a subset of orchestration commands, while other commands such as docker node, docker service still be routed to the default swarm orchestrator ?
Given that this is a fix for a specific command, why cant this option be added to the docker stack deploy command clearly indicating the fact that this is a client only functionality specific to the stack command ?

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@vdemeester @silvin-lubecki does this work only for docker stack command ? If yes, isnt it confusing to have an environment variable DOCKER_ORCHESTRATOR and it is applicable only to a subset of orchestration commands, while other commands such as docker node, docker service still be routed to the default swarm orchestrator ?

Right, this is the case for now (and for this PR). But all orchestrator commands will support k8s. We are still debating if you should fail when k8s is enabled (i.e. put swarm annotation on other orchestrator sub command), warn or do nothing.

Given that this is a fix for a specific command, why cant this option be added to the docker stack deploy command clearly indicating the fact that this is a client only functionality specific to the stack command ?

It should be a all orchestrator command client "switch" (and it is for docker4mac, etc..).

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vdemeester commented Dec 5, 2017

@vdemeester @silvin-lubecki does this work only for docker stack command ? If yes, isnt it confusing to have an environment variable DOCKER_ORCHESTRATOR and it is applicable only to a subset of orchestration commands, while other commands such as docker node, docker service still be routed to the default swarm orchestrator ?

Right, this is the case for now (and for this PR). But all orchestrator commands will support k8s. We are still debating if you should fail when k8s is enabled (i.e. put swarm annotation on other orchestrator sub command), warn or do nothing.

Given that this is a fix for a specific command, why cant this option be added to the docker stack deploy command clearly indicating the fact that this is a client only functionality specific to the stack command ?

It should be a all orchestrator command client "switch" (and it is for docker4mac, etc..).

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friism Dec 5, 2017

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I agree with @mavenugo - a switch on sub-commands where kube support works is easier to reason about than env vars. Esp. since not all the orchestration-related commands (docker stack, docker service, docker node) will understand the env var out of the gate. It's confusing for a user if they set the env var and then only some orchestrator commands interact with kube. A per-command switch makes that clearer.

I think we have to contend with this dual-orchestrator model for a while.

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friism commented Dec 5, 2017

I agree with @mavenugo - a switch on sub-commands where kube support works is easier to reason about than env vars. Esp. since not all the orchestration-related commands (docker stack, docker service, docker node) will understand the env var out of the gate. It's confusing for a user if they set the env var and then only some orchestrator commands interact with kube. A per-command switch makes that clearer.

I think we have to contend with this dual-orchestrator model for a while.

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I agree that DOCKER_ORCHESTRATOR seems a bit overly broad given the current level of support. Perhaps something like DOCKER_STACK_ORCHESTRATOR is a better var for now which maps to a stack command specific flag?

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dhiltgen commented Dec 5, 2017

I agree that DOCKER_ORCHESTRATOR seems a bit overly broad given the current level of support. Perhaps something like DOCKER_STACK_ORCHESTRATOR is a better var for now which maps to a stack command specific flag?

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Why would we want to introduce an env variable that we're going to need to deprecate in a few releases (when other commands are supported) ?

DOCKER_ORCHESTRATOR is the correct forward compatible name for the environment variable.

A flag on docker stack is a good idea, but it doesn't replace the environment variable, which as I understand it, is needed for desktop editions. They are not mutually exclusive, we should support both. There is also a config file option.

Instead of introducing an env variable that we're going to need to replace and deprecate in a few releases how about we add a warning on service/node commands when orchestrator != swarm informing the user that the variable is being ignored, but will be supported in the future? This should be easy to do with a PersistentPreRun hook.

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dnephin commented Dec 5, 2017

Why would we want to introduce an env variable that we're going to need to deprecate in a few releases (when other commands are supported) ?

DOCKER_ORCHESTRATOR is the correct forward compatible name for the environment variable.

A flag on docker stack is a good idea, but it doesn't replace the environment variable, which as I understand it, is needed for desktop editions. They are not mutually exclusive, we should support both. There is also a config file option.

Instead of introducing an env variable that we're going to need to replace and deprecate in a few releases how about we add a warning on service/node commands when orchestrator != swarm informing the user that the variable is being ignored, but will be supported in the future? This should be easy to do with a PersistentPreRun hook.

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@thaJeztah I believe @silvin-lubecki and I found the issue with secrets: you cannot have a kube secret with an underscore.

kubectl create secret generic my_secret --from-literal=file=toto
The Secret "my_secret" is invalid: metadata.name: Invalid value: "my_secret": a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')

If you change your example to mysecret it will work as expected.

The underlying issue is that we weren't checking for returned errors when creating the secret. Silvin will push a fix for this.

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chris-crone commented Jan 3, 2018

@thaJeztah I believe @silvin-lubecki and I found the issue with secrets: you cannot have a kube secret with an underscore.

kubectl create secret generic my_secret --from-literal=file=toto
The Secret "my_secret" is invalid: metadata.name: Invalid value: "my_secret": a DNS-1123 subdomain must consist of lower case alphanumeric characters, '-' or '.', and must start and end with an alphanumeric character (e.g. 'example.com', regex used for validation is '[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*')

If you change your example to mysecret it will work as expected.

The underlying issue is that we weren't checking for returned errors when creating the secret. Silvin will push a fix for this.

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oh, awesome! was just running this PR again for another test 👍

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thaJeztah commented Jan 3, 2018

oh, awesome! was just running this PR again for another test 👍

Check and return error while creating kubernetes secret and config maps.
Signed-off-by: Silvin Lubecki <silvin.lubecki@docker.com>
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PTAL @thaJeztah, just fixed it.

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silvin-lubecki commented Jan 3, 2018

PTAL @thaJeztah, just fixed it.

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Is it correct that we don't namespace services from a stack?

Deploy the stack as "foobar";

$ docker stack deploy -c docker-compose.yml foobar
Stack foobar was created
Waiting for the stack to be stable and running...
 - Service db has one container running
 - Service web has one container running
Stack foobar is stable and running

Deployg the stack as "foobar2":

$ docker stack deploy -c docker-compose.yml foobar2
service db already present in stack named foobar

We should have a solution for that, because multiple stacks will have the same service names (and this is the reason (when using docker-compose or swarmkit service-names are prefixed with their stack-name).

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thaJeztah commented Jan 3, 2018

Is it correct that we don't namespace services from a stack?

Deploy the stack as "foobar";

$ docker stack deploy -c docker-compose.yml foobar
Stack foobar was created
Waiting for the stack to be stable and running...
 - Service db has one container running
 - Service web has one container running
Stack foobar is stable and running

Deployg the stack as "foobar2":

$ docker stack deploy -c docker-compose.yml foobar2
service db already present in stack named foobar

We should have a solution for that, because multiple stacks will have the same service names (and this is the reason (when using docker-compose or swarmkit service-names are prefixed with their stack-name).

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Hm, we also need to find a solution for re-deploying a stack that uses secrets. Secrets are immutable, but when using swarmkit, docker detects that if the content didn't change, and in that case skips creating/updating the secret (and only produces an error if the secret/config changed);

$ docker stack deploy -c docker-compose.yml foobar
secrets "mysecret" already exists
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thaJeztah commented Jan 3, 2018

Hm, we also need to find a solution for re-deploying a stack that uses secrets. Secrets are immutable, but when using swarmkit, docker detects that if the content didn't change, and in that case skips creating/updating the secret (and only produces an error if the secret/config changed);

$ docker stack deploy -c docker-compose.yml foobar
secrets "mysecret" already exists
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@thaJeztah we should create issues for those to discuss them and keep track of updates on it 👼

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vdemeester commented Jan 3, 2018

@thaJeztah we should create issues for those to discuss them and keep track of updates on it 👼

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@thaJeztah you can use the namespace flag:

--namespace string    Kubernetes namespace to use (default "default")
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silvin-lubecki commented Jan 3, 2018

@thaJeztah you can use the namespace flag:

--namespace string    Kubernetes namespace to use (default "default")
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@silvin-lubecki yes; probably something we should do by default (e.g., create a namespace com.docker.stacks.<name-of-stack>, or whatever convention 😄)

@vdemeester I'll create an issue 👍

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thaJeztah commented Jan 3, 2018

@silvin-lubecki yes; probably something we should do by default (e.g., create a namespace com.docker.stacks.<name-of-stack>, or whatever convention 😄)

@vdemeester I'll create an issue 👍

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Regarding seccomp being set to unconfined by default (see my "some interesting bits" #721 (comment)); this was changed upstream in kubernetes in kubernetes/kubernetes#21790. As explained in kubernetes/kubernetes#20870, the reason for this was that the default seccomp profile was more restrictive, and blocked certain actions, even if (e.g.) --cap-add SYS_ADMIN was used (see moby/moby#20245).

However, with moby/moby#22554, I don't think this is still a problem, so we may want to change this behavior and, for Docker 1.12 and up, enable the default seccomp profile

I'll open an issue for that as well

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thaJeztah commented Jan 3, 2018

Regarding seccomp being set to unconfined by default (see my "some interesting bits" #721 (comment)); this was changed upstream in kubernetes in kubernetes/kubernetes#21790. As explained in kubernetes/kubernetes#20870, the reason for this was that the default seccomp profile was more restrictive, and blocked certain actions, even if (e.g.) --cap-add SYS_ADMIN was used (see moby/moby#20245).

However, with moby/moby#22554, I don't think this is still a problem, so we may want to change this behavior and, for Docker 1.12 and up, enable the default seccomp profile

I'll open an issue for that as well

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@thaJeztah yes we thought about that too, but as we wanted to keep it simple, we decided to put everything in default namespace. Depending the feedbacks we will receive, we may change it in a further PR?

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silvin-lubecki commented Jan 3, 2018

@thaJeztah yes we thought about that too, but as we wanted to keep it simple, we decided to put everything in default namespace. Depending the feedbacks we will receive, we may change it in a further PR?

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I don't think we should add the namespace flag and ignore the stack positional argument. We should use the stack positional argument as the namespace and remove the flag.

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dnephin commented Jan 3, 2018

I don't think we should add the namespace flag and ignore the stack positional argument. We should use the stack positional argument as the namespace and remove the flag.

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opened #776 and #777

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thaJeztah commented Jan 3, 2018

opened #776 and #777

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dnephin approved these changes Jan 3, 2018

I guess we can fix the remaining issues in a follow up

LGTM

@thaJeztah

LGTM as well; it's a preview, so let's get this out so that people can play with it 👍

@vdemeester vdemeester merged commit e708c90 into docker:master Jan 3, 2018

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@GordonTheTurtle GordonTheTurtle added this to the 18.01.0 milestone Jan 3, 2018

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🎉

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thaJeztah commented Jan 3, 2018

🎉

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When I created the YAML files for 18.01 after this patch was applied, the one for docker config showed that swarm: false which I think is incorrect. This is kind of serious.

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mistyhacks commented Jan 11, 2018

When I created the YAML files for 18.01 after this patch was applied, the one for docker config showed that swarm: false which I think is incorrect. This is kind of serious.

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