func (daemon *Daemon) verifyContainerSettings(hostConfig *runconfig.HostConfig) ([]string, error) {
var warnings []string
if hostConfig == nil {
return warnings, nil
}
if hostConfig.Memory != 0 && hostConfig.Memory < 4194304 {
return warnings, fmt.Errorf("Minimum memory limit allowed is 4MB")
}
if hostConfig.Memory > 0 && !daemon.SystemConfig().MemoryLimit {
warnings = append(warnings, "Your kernel does not support memory limit capabilities. Limitation discarded.")
glog.Warningf("Your kernel does not support memory limit capabilities. Limitation discarded.")
hostConfig.Memory = 0
}
if hostConfig.Memory > 0 && hostConfig.MemorySwap != -1 && !daemon.SystemConfig().SwapLimit {
warnings = append(warnings, "Your kernel does not support swap limit capabilities, memory limited without swap.")
glog.Warningf("Your kernel does not support swap limit capabilities, memory limited without swap.")
hostConfig.MemorySwap = -1
}
if hostConfig.Memory > 0 && hostConfig.MemorySwap > 0 && hostConfig.MemorySwap < hostConfig.Memory {
return warnings, fmt.Errorf("Minimum memoryswap limit should be larger than memory limit, see usage.")
}
if hostConfig.Memory == 0 && hostConfig.MemorySwap > 0 {
return warnings, fmt.Errorf("You should always set the Memory limit when using Memoryswap limit, see usage.")
}
if hostConfig.CpuPeriod > 0 && !daemon.SystemConfig().CpuCfsPeriod {
warnings = append(warnings, "Your kernel does not support CPU cfs period. Period discarded.")
glog.Warningf("Your kernel does not support CPU cfs period. Period discarded.")
hostConfig.CpuPeriod = 0
}
if hostConfig.CpuQuota > 0 && !daemon.SystemConfig().CpuCfsQuota {
warnings = append(warnings, "Your kernel does not support CPU cfs quota. Quota discarded.")
glog.Warningf("Your kernel does not support CPU cfs quota. Quota discarded.")
hostConfig.CpuQuota = 0
}
if hostConfig.BlkioWeight > 0 && (hostConfig.BlkioWeight < 10 || hostConfig.BlkioWeight > 1000) {
return warnings, fmt.Errorf("Range of blkio weight is from 10 to 1000.")
}
if hostConfig.OomKillDisable && !daemon.SystemConfig().OomKillDisable {
hostConfig.OomKillDisable = false
return warnings, fmt.Errorf("Your kernel does not support oom kill disable.")
}
if daemon.SystemConfig().IPv4ForwardingDisabled {
warnings = append(warnings, "IPv4 forwarding is disabled. Networking will not work.")
glog.Warningf("IPv4 forwarding is disabled. Networking will not work")
}
return warnings, nil
}
func (daemon *Daemon) RegisterLinks(container *Container, hostConfig *runconfig.HostConfig) error {
if hostConfig != nil && hostConfig.Links != nil {
for _, l := range hostConfig.Links {
name, alias, err := parsers.ParseLink(l)
if err != nil {
return err
}
child, err := daemon.Get(name)
if err != nil {
//An error from daemon.Get() means this name could not be found
return fmt.Errorf("Could not get container for %s", name)
}
for child.hostConfig.NetworkMode.IsContainer() {
parts := strings.SplitN(string(child.hostConfig.NetworkMode), ":", 2)
child, err = daemon.Get(parts[1])
if err != nil {
return fmt.Errorf("Could not get container for %s", parts[1])
}
}
if child.hostConfig.NetworkMode.IsHost() {
return runconfig.ErrConflictHostNetworkAndLinks
}
if err := daemon.RegisterLink(container, child, alias); err != nil {
return err
}
}
// After we load all the links into the daemon
// set them to nil on the hostconfig
hostConfig.Links = nil
if err := container.WriteHostConfig(); err != nil {
return err
}
}
return nil
}