add basic config struct to libkpod
Signed-off-by: Ryan Cole <rcyoalne@gmail.com>
This commit is contained in:
Ryan Cole
parent
f8a822e900
commit
0c8f106ee8
8 changed files with 351 additions and 208 deletions
267
libkpod/config.go
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267
libkpod/config.go
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package libkpod
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import (
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"bytes"
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"io/ioutil"
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"github.com/BurntSushi/toml"
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"github.com/opencontainers/selinux/go-selinux"
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)
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// Default paths if none are specified
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const (
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crioRoot = "/var/lib/containers/storage"
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crioRunRoot = "/var/run/containers/storage"
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conmonPath = "/usr/local/libexec/crio/conmon"
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pauseImage = "kubernetes/pause"
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pauseCommand = "/pause"
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defaultTransport = "docker://"
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seccompProfilePath = "/etc/crio/seccomp.json"
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apparmorProfileName = "crio-default"
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cniConfigDir = "/etc/cni/net.d/"
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cniBinDir = "/opt/cni/bin/"
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cgroupManager = "cgroupfs"
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)
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// Config represents the entire set of configuration values that can be set for
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// the server. This is intended to be loaded from a toml-encoded config file.
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type Config struct {
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RootConfig
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RuntimeConfig
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ImageConfig
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NetworkConfig
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}
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// ImageVolumesType describes image volume handling strategies
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type ImageVolumesType string
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const (
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// ImageVolumesMkdir option is for using mkdir to handle image volumes
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ImageVolumesMkdir ImageVolumesType = "mkdir"
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// ImageVolumesIgnore option is for ignoring image volumes altogether
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ImageVolumesIgnore ImageVolumesType = "ignore"
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// ImageVolumesBind option is for using bind mounted volumes
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ImageVolumesBind ImageVolumesType = "bind"
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)
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const (
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// DefaultPidsLimit is the default value for maximum number of processes
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// allowed inside a container
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DefaultPidsLimit = 1024
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)
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// This structure is necessary to fake the TOML tables when parsing,
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// while also not requiring a bunch of layered structs for no good
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// reason.
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// RootConfig represents the root of the "crio" TOML config table.
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type RootConfig struct {
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// Root is a path to the "root directory" where data not
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// explicitly handled by other options will be stored.
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Root string `toml:"root"`
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// RunRoot is a path to the "run directory" where state information not
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// explicitly handled by other options will be stored.
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RunRoot string `toml:"runroot"`
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// Storage is the name of the storage driver which handles actually
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// storing the contents of containers.
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Storage string `toml:"storage_driver"`
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// StorageOption is a list of storage driver specific options.
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StorageOptions []string `toml:"storage_option"`
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// LogDir is the default log directory were all logs will go unless kubelet
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// tells us to put them somewhere else.
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LogDir string `toml:"log_dir"`
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}
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// RuntimeConfig represents the "crio.runtime" TOML config table.
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type RuntimeConfig struct {
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// Runtime is the OCI compatible runtime used for trusted container workloads.
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// This is a mandatory setting as this runtime will be the default one and
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// will also be used for untrusted container workloads if
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// RuntimeUntrustedWorkload is not set.
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Runtime string `toml:"runtime"`
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// RuntimeUntrustedWorkload is the OCI compatible runtime used for untrusted
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// container workloads. This is an optional setting, except if
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// DefaultWorkloadTrust is set to "untrusted".
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RuntimeUntrustedWorkload string `toml:"runtime_untrusted_workload"`
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// DefaultWorkloadTrust is the default level of trust crio puts in container
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// workloads. This can either be "trusted" or "untrusted" and the default
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// is "trusted"
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// Containers can be run through different container runtimes, depending on
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// the trust hints we receive from kubelet:
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// - If kubelet tags a container workload as untrusted, crio will try first
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// to run it through the untrusted container workload runtime. If it is not
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// set, crio will use the trusted runtime.
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// - If kubelet does not provide any information about the container workload trust
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// level, the selected runtime will depend on the DefaultWorkloadTrust setting.
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// If it is set to "untrusted", then all containers except for the host privileged
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// ones, will be run by the RuntimeUntrustedWorkload runtime. Host privileged
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// containers are by definition trusted and will always use the trusted container
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// runtime. If DefaultWorkloadTrust is set to "trusted", crio will use the trusted
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// container runtime for all containers.
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DefaultWorkloadTrust string `toml:"default_workload_trust"`
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// Conmon is the path to conmon binary, used for managing the runtime.
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Conmon string `toml:"conmon"`
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// ConmonEnv is the environment variable list for conmon process.
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ConmonEnv []string `toml:"conmon_env"`
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// SELinux determines whether or not SELinux is used for pod separation.
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SELinux bool `toml:"selinux"`
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// SeccompProfile is the seccomp json profile path which is used as the
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// default for the runtime.
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SeccompProfile string `toml:"seccomp_profile"`
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// ApparmorProfile is the apparmor profile name which is used as the
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// default for the runtime.
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ApparmorProfile string `toml:"apparmor_profile"`
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// CgroupManager is the manager implementation name which is used to
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// handle cgroups for containers.
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CgroupManager string `toml:"cgroup_manager"`
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// PidsLimit is the number of processes each container is restricted to
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// by the cgroup process number controller.
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PidsLimit int64 `toml:"pids_limit"`
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}
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// ImageConfig represents the "crio.image" TOML config table.
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type ImageConfig struct {
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// DefaultTransport is a value we prefix to image names that fail to
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// validate source references.
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DefaultTransport string `toml:"default_transport"`
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// PauseImage is the name of an image which we use to instantiate infra
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// containers.
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PauseImage string `toml:"pause_image"`
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// PauseCommand is the path of the binary we run in an infra
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// container that's been instantiated using PauseImage.
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PauseCommand string `toml:"pause_command"`
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// SignaturePolicyPath is the name of the file which decides what sort
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// of policy we use when deciding whether or not to trust an image that
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// we've pulled. Outside of testing situations, it is strongly advised
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// that this be left unspecified so that the default system-wide policy
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// will be used.
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SignaturePolicyPath string `toml:"signature_policy"`
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// InsecureRegistries is a list of registries that must be contacted w/o
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// TLS verification.
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InsecureRegistries []string `toml:"insecure_registries"`
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// ImageVolumes controls how volumes specified in image config are handled
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ImageVolumes ImageVolumesType `toml:"image_volumes"`
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}
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// NetworkConfig represents the "crio.network" TOML config table
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type NetworkConfig struct {
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// NetworkDir is where CNI network configuration files are stored.
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NetworkDir string `toml:"network_dir"`
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// PluginDir is where CNI plugin binaries are stored.
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PluginDir string `toml:"plugin_dir"`
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}
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// tomlConfig is another way of looking at a Config, which is
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// TOML-friendly (it has all of the explicit tables). It's just used for
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// conversions.
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type tomlConfig struct {
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Crio struct {
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RootConfig
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Runtime struct{ RuntimeConfig } `toml:"runtime"`
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Image struct{ ImageConfig } `toml:"image"`
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Network struct{ NetworkConfig } `toml:"network"`
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} `toml:"crio"`
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}
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func (t *tomlConfig) toConfig(c *Config) {
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c.RootConfig = t.Crio.RootConfig
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c.RuntimeConfig = t.Crio.Runtime.RuntimeConfig
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c.ImageConfig = t.Crio.Image.ImageConfig
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c.NetworkConfig = t.Crio.Network.NetworkConfig
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}
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func (t *tomlConfig) fromConfig(c *Config) {
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t.Crio.RootConfig = c.RootConfig
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t.Crio.Runtime.RuntimeConfig = c.RuntimeConfig
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t.Crio.Image.ImageConfig = c.ImageConfig
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t.Crio.Network.NetworkConfig = c.NetworkConfig
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}
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// FromFile populates the Config from the TOML-encoded file at the given path.
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// Returns errors encountered when reading or parsing the files, or nil
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// otherwise.
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func (c *Config) FromFile(path string) error {
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data, err := ioutil.ReadFile(path)
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if err != nil {
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return err
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}
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t := new(tomlConfig)
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t.fromConfig(c)
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_, err = toml.Decode(string(data), t)
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if err != nil {
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return err
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}
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t.toConfig(c)
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return nil
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}
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// ToFile outputs the given Config as a TOML-encoded file at the given path.
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// Returns errors encountered when generating or writing the file, or nil
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// otherwise.
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func (c *Config) ToFile(path string) error {
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var w bytes.Buffer
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e := toml.NewEncoder(&w)
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t := new(tomlConfig)
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t.fromConfig(c)
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if err := e.Encode(*t); err != nil {
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return err
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}
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return ioutil.WriteFile(path, w.Bytes(), 0644)
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}
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// DefaultConfig returns the default configuration for crio.
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func DefaultConfig() *Config {
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return &Config{
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RootConfig: RootConfig{
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Root: crioRoot,
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RunRoot: crioRunRoot,
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LogDir: "/var/log/crio/pods",
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},
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RuntimeConfig: RuntimeConfig{
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Runtime: "/usr/bin/runc",
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RuntimeUntrustedWorkload: "",
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DefaultWorkloadTrust: "trusted",
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Conmon: conmonPath,
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ConmonEnv: []string{
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"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
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},
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SELinux: selinux.GetEnabled(),
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SeccompProfile: seccompProfilePath,
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ApparmorProfile: apparmorProfileName,
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CgroupManager: cgroupManager,
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PidsLimit: DefaultPidsLimit,
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},
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ImageConfig: ImageConfig{
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DefaultTransport: defaultTransport,
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PauseImage: pauseImage,
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PauseCommand: pauseCommand,
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SignaturePolicyPath: "",
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ImageVolumes: ImageVolumesMkdir,
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},
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NetworkConfig: NetworkConfig{
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NetworkDir: cniConfigDir,
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PluginDir: cniBinDir,
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},
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}
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}
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@ -29,6 +29,7 @@ type ContainerServer struct {
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imageContext *types.SystemContext
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stateLock sync.Locker
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state *containerServerState
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config *Config
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}
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// Runtime returns the oci runtime for the ContainerServer
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@ -71,8 +72,32 @@ func (c *ContainerServer) ImageContext() *types.SystemContext {
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return c.imageContext
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}
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// Config gets the configuration for the ContainerServer
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func (c *ContainerServer) Config() *Config {
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return c.config
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}
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// New creates a new ContainerServer with options provided
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func New(runtime *oci.Runtime, store cstorage.Store, imageService storage.ImageServer, signaturePolicyPath string) *ContainerServer {
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func New(config *Config) (*ContainerServer, error) {
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store, err := cstorage.GetStore(cstorage.StoreOptions{
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RunRoot: config.RunRoot,
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GraphRoot: config.Root,
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GraphDriverName: config.Storage,
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GraphDriverOptions: config.StorageOptions,
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})
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if err != nil {
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return nil, err
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}
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imageService, err := storage.GetImageService(store, config.DefaultTransport, config.InsecureRegistries)
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if err != nil {
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return nil, err
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}
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runtime, err := oci.New(config.Runtime, config.RuntimeUntrustedWorkload, config.DefaultWorkloadTrust, config.Conmon, config.ConmonEnv, config.CgroupManager)
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if err != nil {
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return nil, err
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}
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return &ContainerServer{
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runtime: runtime,
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store: store,
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@ -81,13 +106,14 @@ func New(runtime *oci.Runtime, store cstorage.Store, imageService storage.ImageS
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ctrIDIndex: truncindex.NewTruncIndex([]string{}),
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podNameIndex: registrar.NewRegistrar(),
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podIDIndex: truncindex.NewTruncIndex([]string{}),
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imageContext: &types.SystemContext{SignaturePolicyPath: signaturePolicyPath},
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imageContext: &types.SystemContext{SignaturePolicyPath: config.SignaturePolicyPath},
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stateLock: new(sync.Mutex),
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state: &containerServerState{
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containers: oci.NewMemoryStore(),
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sandboxes: make(map[string]*sandbox.Sandbox),
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},
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}
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config: config,
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}, nil
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}
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// ContainerStateFromDisk retrieves information on the state of a running container
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