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Fix cpu/memory limits and reservations being reset on service update 

Before this change:
----------------------------------------------------

Create a service with reservations and limits for memory and cpu:

    docker service create --name test \
      --limit-memory=100M --limit-cpu=1 \
      --reserve-memory=100M --reserve-cpu=1 \
      nginx:alpine

Verify the configuration

    docker service inspect --format '{{json .Spec.TaskTemplate.Resources}}' test
    {
      "Limits": {
        "NanoCPUs": 1000000000,
        "MemoryBytes": 104857600
      },
      "Reservations": {
        "NanoCPUs": 1000000000,
        "MemoryBytes": 104857600
      }
    }

Update just CPU limit and reservation:

    docker service update --limit-cpu=2 --reserve-cpu=2 test

Notice that the memory limit and reservation is not preserved:

    docker service inspect --format '{{json .Spec.TaskTemplate.Resources}}' test
    {
      "Limits": {
        "NanoCPUs": 2000000000
      },
      "Reservations": {
        "NanoCPUs": 2000000000
      }
    }

Update just Memory limit and reservation:

    docker service update --limit-memory=200M --reserve-memory=200M test

Notice that the CPU limit and reservation is not preserved:

    docker service inspect --format '{{json .Spec.TaskTemplate.Resources}}' test
    {
      "Limits": {
        "MemoryBytes": 209715200
      },
      "Reservations": {
        "MemoryBytes": 209715200
      }
    }

After this change:
----------------------------------------------------

Create a service with reservations and limits for memory and cpu:

    docker service create --name test \
      --limit-memory=100M --limit-cpu=1 \
      --reserve-memory=100M --reserve-cpu=1 \
      nginx:alpine

Verify the configuration

    docker service inspect --format '{{json .Spec.TaskTemplate.Resources}}' test
    {
      "Limits": {
        "NanoCPUs": 1000000000,
        "MemoryBytes": 104857600
      },
      "Reservations": {
        "NanoCPUs": 1000000000,
        "MemoryBytes": 104857600
      }
    }

Update just CPU limit and reservation:

    docker service update --limit-cpu=2 --reserve-cpu=2 test

Confirm that the CPU limits/reservations are updated, but memory limit and reservation are preserved:

    docker service inspect --format '{{json .Spec.TaskTemplate.Resources}}' test
    {
      "Limits": {
        "NanoCPUs": 2000000000,
        "MemoryBytes": 104857600
      },
      "Reservations": {
        "NanoCPUs": 2000000000,
        "MemoryBytes": 104857600
      }
    }

Update just Memory limit and reservation:

    docker service update --limit-memory=200M --reserve-memory=200M test

Confirm that the Mempry limits/reservations are updated, but CPU limit and reservation are preserved:

    docker service inspect --format '{{json .Spec.TaskTemplate.Resources}}' test
    {
      "Limits": {
        "NanoCPUs": 2000000000,
        "MemoryBytes": 209715200
      },
      "Reservations": {
        "NanoCPUs": 2000000000,
        "MemoryBytes": 209715200
      }
    }

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2018-05-24 01:11:49 +02:00
parent fd6165399d
commit df43eb931e
No known key found for this signature in database
GPG Key ID: 76698F39D527CE8C
2 changed files with 46 additions and 2 deletions
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4
cli/command/service/update.go
View File

@ -314,12 +314,12 @@ func updateService(ctx context.Context, apiClient client.NetworkAPIClient, flags
}
if flags.Changed(flagLimitCPU) || flags.Changed(flagLimitMemory) {
taskResources().Limits = &swarm.Resources{}
taskResources().Limits = spec.TaskTemplate.Resources.Limits
updateInt64Value(flagLimitCPU, &task.Resources.Limits.NanoCPUs)
updateInt64Value(flagLimitMemory, &task.Resources.Limits.MemoryBytes)
}
if flags.Changed(flagReserveCPU) || flags.Changed(flagReserveMemory) {
taskResources().Reservations = &swarm.Resources{}
taskResources().Reservations = spec.TaskTemplate.Resources.Reservations
updateInt64Value(flagReserveCPU, &task.Resources.Reservations.NanoCPUs)
updateInt64Value(flagReserveMemory, &task.Resources.Reservations.MemoryBytes)
}

44
cli/command/service/update_test.go
View File

@ -587,6 +587,50 @@ func TestUpdateIsolationValid(t *testing.T) {
assert.Check(t, is.Equal(container.IsolationProcess, spec.TaskTemplate.ContainerSpec.Isolation))
}
// TestUpdateLimitsReservations tests that limits and reservations are updated,
// and that values are not updated are not reset to their default value
func TestUpdateLimitsReservations(t *testing.T) {
spec := swarm.ServiceSpec{
TaskTemplate: swarm.TaskSpec{
ContainerSpec: &swarm.ContainerSpec{},
Resources: &swarm.ResourceRequirements{
Limits: &swarm.Resources{
NanoCPUs: 1000000000,
MemoryBytes: 104857600,
},
Reservations: &swarm.Resources{
NanoCPUs: 1000000000,
MemoryBytes: 104857600,
},
},
},
}
flags := newUpdateCommand(nil).Flags()
err := flags.Set(flagLimitCPU, "2")
assert.NilError(t, err)
err = flags.Set(flagReserveCPU, "2")
assert.NilError(t, err)
err = updateService(context.Background(), nil, flags, &spec)
assert.NilError(t, err)
assert.Check(t, is.Equal(spec.TaskTemplate.Resources.Limits.NanoCPUs, int64(2000000000)))
assert.Check(t, is.Equal(spec.TaskTemplate.Resources.Limits.MemoryBytes, int64(104857600)))
assert.Check(t, is.Equal(spec.TaskTemplate.Resources.Reservations.NanoCPUs, int64(2000000000)))
assert.Check(t, is.Equal(spec.TaskTemplate.Resources.Reservations.MemoryBytes, int64(104857600)))
flags = newUpdateCommand(nil).Flags()
err = flags.Set(flagLimitMemory, "200M")
assert.NilError(t, err)
err = flags.Set(flagReserveMemory, "200M")
assert.NilError(t, err)
err = updateService(context.Background(), nil, flags, &spec)
assert.NilError(t, err)
assert.Check(t, is.Equal(spec.TaskTemplate.Resources.Limits.NanoCPUs, int64(2000000000)))
assert.Check(t, is.Equal(spec.TaskTemplate.Resources.Limits.MemoryBytes, int64(209715200)))
assert.Check(t, is.Equal(spec.TaskTemplate.Resources.Reservations.NanoCPUs, int64(2000000000)))
assert.Check(t, is.Equal(spec.TaskTemplate.Resources.Reservations.MemoryBytes, int64(209715200)))
}
func TestUpdateIsolationInvalid(t *testing.T) {
// validation depends on daemon os / version so validation should be done on the daemon side
flags := newUpdateCommand(nil).Flags()