// adaptContainerSettings is called during container creation to modify any
// settings necessary in the HostConfig structure.
func (daemon *Daemon) adaptContainerSettings(hostConfig *containertypes.HostConfig, adjustCPUShares bool) error {
if adjustCPUShares && hostConfig.CPUShares > 0 {
// Handle unsupported CPUShares
if hostConfig.CPUShares < linuxMinCPUShares {
logrus.Warnf("Changing requested CPUShares of %d to minimum allowed of %d", hostConfig.CPUShares, linuxMinCPUShares)
hostConfig.CPUShares = linuxMinCPUShares
} else if hostConfig.CPUShares > linuxMaxCPUShares {
logrus.Warnf("Changing requested CPUShares of %d to maximum allowed of %d", hostConfig.CPUShares, linuxMaxCPUShares)
hostConfig.CPUShares = linuxMaxCPUShares
}
}
if hostConfig.Memory > 0 && hostConfig.MemorySwap == 0 {
// By default, MemorySwap is set to twice the size of Memory.
hostConfig.MemorySwap = hostConfig.Memory * 2
}
if hostConfig.ShmSize == 0 {
hostConfig.ShmSize = container.DefaultSHMSize
}
var err error
opts, err := daemon.generateSecurityOpt(hostConfig.IpcMode, hostConfig.PidMode, hostConfig.Privileged)
if err != nil {
return err
}
hostConfig.SecurityOpt = append(hostConfig.SecurityOpt, opts...)
if hostConfig.MemorySwappiness == nil {
defaultSwappiness := int64(-1)
hostConfig.MemorySwappiness = &defaultSwappiness
}
if hostConfig.OomKillDisable == nil {
defaultOomKillDisable := false
hostConfig.OomKillDisable = &defaultOomKillDisable
}
return nil
}