281 lines
9.3 KiB
Go
281 lines
9.3 KiB
Go
package runconfig
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import (
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"encoding/json"
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"io"
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"strings"
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"github.com/docker/docker/pkg/nat"
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"github.com/docker/docker/pkg/stringutils"
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"github.com/docker/docker/pkg/ulimit"
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)
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// KeyValuePair is a structure that hold a value for a key.
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type KeyValuePair struct {
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Key string
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Value string
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}
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// NetworkMode represents the container network stack.
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type NetworkMode string
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// IpcMode represents the container ipc stack.
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type IpcMode string
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// IsPrivate indicates whether the container uses it's private ipc stack.
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func (n IpcMode) IsPrivate() bool {
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return !(n.IsHost() || n.IsContainer())
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}
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// IsHost indicates whether the container uses the host's ipc stack.
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func (n IpcMode) IsHost() bool {
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return n == "host"
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}
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// IsContainer indicates whether the container uses a container's ipc stack.
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func (n IpcMode) IsContainer() bool {
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parts := strings.SplitN(string(n), ":", 2)
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return len(parts) > 1 && parts[0] == "container"
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}
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// Valid indicates whether the ipc stack is valid.
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func (n IpcMode) Valid() bool {
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parts := strings.Split(string(n), ":")
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switch mode := parts[0]; mode {
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case "", "host":
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case "container":
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if len(parts) != 2 || parts[1] == "" {
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return false
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}
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default:
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return false
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}
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return true
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}
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// Container returns the name of the container ipc stack is going to be used.
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func (n IpcMode) Container() string {
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parts := strings.SplitN(string(n), ":", 2)
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if len(parts) > 1 {
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return parts[1]
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}
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return ""
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}
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// UTSMode represents the UTS namespace of the container.
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type UTSMode string
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// IsPrivate indicates whether the container uses it's private UTS namespace.
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func (n UTSMode) IsPrivate() bool {
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return !(n.IsHost())
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}
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// IsHost indicates whether the container uses the host's UTS namespace.
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func (n UTSMode) IsHost() bool {
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return n == "host"
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}
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// Valid indicates whether the UTS namespace is valid.
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func (n UTSMode) Valid() bool {
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parts := strings.Split(string(n), ":")
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switch mode := parts[0]; mode {
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case "", "host":
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default:
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return false
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}
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return true
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}
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// PidMode represents the pid stack of the container.
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type PidMode string
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// IsPrivate indicates whether the container uses it's private pid stack.
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func (n PidMode) IsPrivate() bool {
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return !(n.IsHost())
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}
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// IsHost indicates whether the container uses the host's pid stack.
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func (n PidMode) IsHost() bool {
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return n == "host"
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}
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// Valid indicates whether the pid stack is valid.
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func (n PidMode) Valid() bool {
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parts := strings.Split(string(n), ":")
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switch mode := parts[0]; mode {
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case "", "host":
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default:
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return false
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}
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return true
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}
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// DeviceMapping represents the device mapping between the host and the container.
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type DeviceMapping struct {
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PathOnHost string
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PathInContainer string
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CgroupPermissions string
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}
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// RestartPolicy represents the restart policies of the container.
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type RestartPolicy struct {
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Name string
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MaximumRetryCount int
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}
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// IsNone indicates whether the container has the "no" restart policy.
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// This means the container will not automatically restart when exiting.
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func (rp *RestartPolicy) IsNone() bool {
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return rp.Name == "no"
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}
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// IsAlways indicates whether the container has the "always" restart policy.
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// This means the container will automatically restart regardless of the exit status.
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func (rp *RestartPolicy) IsAlways() bool {
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return rp.Name == "always"
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}
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// IsOnFailure indicates whether the container has the "on-failure" restart policy.
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// This means the contain will automatically restart of exiting with a non-zero exit status.
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func (rp *RestartPolicy) IsOnFailure() bool {
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return rp.Name == "on-failure"
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}
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// IsUnlessStopped indicates whether the container has the
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// "unless-stopped" restart policy. This means the container will
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// automatically restart unless user has put it to stopped state.
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func (rp *RestartPolicy) IsUnlessStopped() bool {
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return rp.Name == "unless-stopped"
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}
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// LogConfig represents the logging configuration of the container.
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type LogConfig struct {
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Type string
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Config map[string]string
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}
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// LxcConfig represents the specific LXC configuration of the container.
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type LxcConfig struct {
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values []KeyValuePair
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}
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// MarshalJSON marshals (or serializes) the LxcConfig into JSON.
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func (c *LxcConfig) MarshalJSON() ([]byte, error) {
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if c == nil {
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return []byte{}, nil
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}
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return json.Marshal(c.Slice())
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}
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// UnmarshalJSON unmarshals (or deserializes) the specified byte slices from JSON to
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// a LxcConfig.
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func (c *LxcConfig) UnmarshalJSON(b []byte) error {
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if len(b) == 0 {
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return nil
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}
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var kv []KeyValuePair
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if err := json.Unmarshal(b, &kv); err != nil {
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var h map[string]string
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if err := json.Unmarshal(b, &h); err != nil {
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return err
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}
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for k, v := range h {
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kv = append(kv, KeyValuePair{k, v})
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}
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}
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c.values = kv
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return nil
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}
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// Len returns the number of specific lxc configuration.
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func (c *LxcConfig) Len() int {
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if c == nil {
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return 0
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}
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return len(c.values)
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}
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// Slice returns the specific lxc configuration into a slice of KeyValuePair.
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func (c *LxcConfig) Slice() []KeyValuePair {
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if c == nil {
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return nil
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}
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return c.values
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}
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// NewLxcConfig creates a LxcConfig from the specified slice of KeyValuePair.
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func NewLxcConfig(values []KeyValuePair) *LxcConfig {
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return &LxcConfig{values}
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}
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// HostConfig the non-portable Config structure of a container.
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// Here, "non-portable" means "dependent of the host we are running on".
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// Portable information *should* appear in Config.
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type HostConfig struct {
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Binds []string // List of volume bindings for this container
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ContainerIDFile string // File (path) where the containerId is written
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LxcConf *LxcConfig // Additional lxc configuration
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Memory int64 // Memory limit (in bytes)
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MemorySwap int64 // Total memory usage (memory + swap); set `-1` to disable swap
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KernelMemory int64 // Kernel memory limit (in bytes)
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CPUShares int64 `json:"CpuShares"` // CPU shares (relative weight vs. other containers)
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CPUPeriod int64 `json:"CpuPeriod"` // CPU CFS (Completely Fair Scheduler) period
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CpusetCpus string // CpusetCpus 0-2, 0,1
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CpusetMems string // CpusetMems 0-2, 0,1
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CPUQuota int64 `json:"CpuQuota"` // CPU CFS (Completely Fair Scheduler) quota
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BlkioWeight int64 // Block IO weight (relative weight vs. other containers)
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OomKillDisable bool // Whether to disable OOM Killer or not
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MemorySwappiness *int64 // Tuning container memory swappiness behaviour
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Privileged bool // Is the container in privileged mode
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PortBindings nat.PortMap // Port mapping between the exposed port (container) and the host
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Links []string // List of links (in the name:alias form)
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PublishAllPorts bool // Should docker publish all exposed port for the container
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DNS []string `json:"Dns"` // List of DNS server to lookup
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DNSSearch []string `json:"DnsSearch"` // List of DNSSearch to look for
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ExtraHosts []string // List of extra hosts
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VolumesFrom []string // List of volumes to take from other container
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Devices []DeviceMapping // List of devices to map inside the container
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NetworkMode NetworkMode // Network namespace to use for the container
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IpcMode IpcMode // IPC namespace to use for the container
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PidMode PidMode // PID namespace to use for the container
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UTSMode UTSMode // UTS namespace to use for the container
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CapAdd *stringutils.StrSlice // List of kernel capabilities to add to the container
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CapDrop *stringutils.StrSlice // List of kernel capabilities to remove from the container
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GroupAdd []string // List of additional groups that the container process will run as
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RestartPolicy RestartPolicy // Restart policy to be used for the container
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SecurityOpt []string // List of string values to customize labels for MLS systems, such as SELinux.
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ReadonlyRootfs bool // Is the container root filesystem in read-only
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Ulimits []*ulimit.Ulimit // List of ulimits to be set in the container
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LogConfig LogConfig // Configuration of the logs for this container
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CgroupParent string // Parent cgroup.
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ConsoleSize [2]int // Initial console size on Windows
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}
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// DecodeHostConfig creates a HostConfig based on the specified Reader.
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// It assumes the content of the reader will be JSON, and decodes it.
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func DecodeHostConfig(src io.Reader) (*HostConfig, error) {
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decoder := json.NewDecoder(src)
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var w ContainerConfigWrapper
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if err := decoder.Decode(&w); err != nil {
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return nil, err
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}
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hc := w.getHostConfig()
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return hc, nil
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}
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// SetDefaultNetModeIfBlank changes the NetworkMode in a HostConfig structure
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// to default if it is not populated. This ensures backwards compatibility after
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// the validation of the network mode was moved from the docker CLI to the
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// docker daemon.
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func SetDefaultNetModeIfBlank(hc *HostConfig) *HostConfig {
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if hc != nil {
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if hc.NetworkMode == NetworkMode("") {
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hc.NetworkMode = NetworkMode("default")
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}
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}
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return hc
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}
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