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agent_compatibility_linux.go
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agent_compatibility_linux.go
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//go:build linux
// +build linux
// Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"). You may
// not use this file except in compliance with the License. A copy of the
// License is located at
//
// http://aws.amazon.com/apache2.0/
//
// or in the "license" file accompanying this file. This file is distributed
// on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
// express or implied. See the License for the specific language governing
// permissions and limitations under the License.
package app
import (
"github.com/aws/amazon-ecs-agent/agent/config"
"github.com/aws/amazon-ecs-agent/agent/engine"
"github.com/cihub/seelog"
"github.com/pkg/errors"
)
// checkCompatibility (for linux) ensures that the running task engine is capable for running with the TaskCPUMemLimit
// flag enabled. It will disable the feature if it determines that it is incompatible and the feature isn't explicitly
// enabled.
func (agent *ecsAgent) checkCompatibility(engine engine.TaskEngine) error {
// We don't need to do these checks if CPUMemLimit is disabled
if !agent.cfg.TaskCPUMemLimit.Enabled() {
return nil
}
tasks, err := engine.ListTasks()
if err != nil {
return err
}
// Loop over each task to determine if the state is compatible with the running version of agent and its options
compatible := true
for _, task := range tasks {
if !task.MemoryCPULimitsEnabled {
seelog.Warnf("App: task from state file is not compatible with TaskCPUMemLimit setting, because it is not using ecs' cgroup hierarchy: %s", task.Arn)
compatible = false
break
}
}
if compatible {
return nil
}
if agent.cfg.TaskCPUMemLimit.Value == config.ExplicitlyEnabled {
return errors.New("App: unable to load old tasks because TaskCPUMemLimits setting is incompatible with old state.")
}
seelog.Warn("App: disabling TaskCPUMemLimit.")
agent.cfg.TaskCPUMemLimit.Value = config.ExplicitlyDisabled
return nil
}