mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-24 13:05:17 +00:00
300 lines
8.8 KiB
Go
300 lines
8.8 KiB
Go
/**
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# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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*/
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package main
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import (
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"fmt"
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"net"
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"os"
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"syscall"
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"time"
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"github.com/NVIDIA/nvidia-container-toolkit/internal/info"
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"github.com/NVIDIA/nvidia-container-toolkit/pkg/config/engine/docker"
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"github.com/NVIDIA/nvidia-container-toolkit/tools/container"
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log "github.com/sirupsen/logrus"
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cli "github.com/urfave/cli/v2"
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)
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const (
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defaultConfig = "/etc/docker/daemon.json"
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defaultSocket = "/var/run/docker.sock"
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defaultSetAsDefault = true
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// defaultRuntimeName specifies the NVIDIA runtime to be use as the default runtime if setting the default runtime is enabled
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defaultRuntimeName = "nvidia"
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defaultRestartMode = "signal"
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defaultHostRootMount = "/host"
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reloadBackoff = 5 * time.Second
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maxReloadAttempts = 6
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socketMessageToGetPID = "GET /info HTTP/1.0\r\n\r\n"
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)
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// options stores the configuration from the command line or environment variables
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type options struct {
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container.Options
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}
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func main() {
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options := options{}
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// Create the top-level CLI
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c := cli.NewApp()
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c.Name = "docker"
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c.Usage = "Update docker config with the nvidia runtime"
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c.Version = info.GetVersionString()
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// Create the 'setup' subcommand
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setup := cli.Command{}
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setup.Name = "setup"
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setup.Usage = "Trigger docker config to be updated"
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setup.ArgsUsage = "<runtime_dirname>"
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setup.Action = func(c *cli.Context) error {
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return Setup(c, &options)
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}
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setup.Before = func(c *cli.Context) error {
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return container.ParseArgs(c, &options.Options)
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}
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// Create the 'cleanup' subcommand
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cleanup := cli.Command{}
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cleanup.Name = "cleanup"
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cleanup.Usage = "Trigger any updates made to docker config to be undone"
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cleanup.ArgsUsage = "<runtime_dirname>"
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cleanup.Action = func(c *cli.Context) error {
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return Cleanup(c, &options)
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}
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cleanup.Before = func(c *cli.Context) error {
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return container.ParseArgs(c, &options.Options)
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}
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// Register the subcommands with the top-level CLI
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c.Commands = []*cli.Command{
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&setup,
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&cleanup,
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}
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// Setup common flags across both subcommands. All subcommands get the same
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// set of flags even if they don't use some of them. This is so that we
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// only require the user to specify one set of flags for both 'startup'
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// and 'cleanup' to simplify things.
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commonFlags := []cli.Flag{
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&cli.StringFlag{
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Name: "config",
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Usage: "Path to docker config file",
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Value: defaultConfig,
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Destination: &options.Config,
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EnvVars: []string{"RUNTIME_CONFIG", "DOCKER_CONFIG"},
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},
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&cli.StringFlag{
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Name: "socket",
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Usage: "Path to the docker socket file",
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Value: defaultSocket,
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Destination: &options.Socket,
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EnvVars: []string{"RUNTIME_SOCKET", "DOCKER_SOCKET"},
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},
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&cli.StringFlag{
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Name: "restart-mode",
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Usage: "Specify how docker should be restarted; If 'none' is selected it will not be restarted [signal | systemd | none ]",
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Value: defaultRestartMode,
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Destination: &options.RestartMode,
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EnvVars: []string{"RUNTIME_RESTART_MODE", "DOCKER_RESTART_MODE"},
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},
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&cli.StringFlag{
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Name: "host-root",
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Usage: "Specify the path to the host root to be used when restarting docker using systemd",
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Value: defaultHostRootMount,
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Destination: &options.HostRootMount,
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EnvVars: []string{"HOST_ROOT_MOUNT"},
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// Restart using systemd is currently not supported.
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// We hide this option for the time being.
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Hidden: true,
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},
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&cli.StringFlag{
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Name: "runtime-name",
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Aliases: []string{"nvidia-runtime-name", "runtime-class"},
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Usage: "Specify the name of the `nvidia` runtime. If set-as-default is selected, the runtime is used as the default runtime.",
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Value: defaultRuntimeName,
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Destination: &options.RuntimeName,
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EnvVars: []string{"NVIDIA_RUNTIME_NAME", "DOCKER_RUNTIME_NAME"},
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},
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&cli.StringFlag{
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Name: "nvidia-runtime-dir",
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Aliases: []string{"runtime-dir"},
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Usage: "The path where the nvidia-container-runtime binaries are located. If this is not specified, the first argument will be used instead",
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Destination: &options.RuntimeDir,
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EnvVars: []string{"NVIDIA_RUNTIME_DIR"},
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},
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&cli.BoolFlag{
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Name: "set-as-default",
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Usage: "Set the `nvidia` runtime as the default runtime.",
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Value: defaultSetAsDefault,
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Destination: &options.SetAsDefault,
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EnvVars: []string{"NVIDIA_RUNTIME_SET_AS_DEFAULT", "DOCKER_SET_AS_DEFAULT"},
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Hidden: true,
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},
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}
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// Update the subcommand flags with the common subcommand flags
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setup.Flags = append([]cli.Flag{}, commonFlags...)
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cleanup.Flags = append([]cli.Flag{}, commonFlags...)
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// Run the top-level CLI
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if err := c.Run(os.Args); err != nil {
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log.Errorf("Error running docker configuration: %v", err)
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os.Exit(1)
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}
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}
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// Setup updates docker configuration to include the nvidia runtime and reloads it
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func Setup(c *cli.Context, o *options) error {
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log.Infof("Starting 'setup' for %v", c.App.Name)
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cfg, err := docker.New(
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docker.WithPath(o.Config),
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)
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if err != nil {
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return fmt.Errorf("unable to load config: %v", err)
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}
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err = o.Configure(cfg)
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if err != nil {
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return fmt.Errorf("unable to configure docker: %v", err)
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}
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err = RestartDocker(o)
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if err != nil {
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return fmt.Errorf("unable to restart docker: %v", err)
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}
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log.Infof("Completed 'setup' for %v", c.App.Name)
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return nil
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}
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// Cleanup reverts docker configuration to remove the nvidia runtime and reloads it
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func Cleanup(c *cli.Context, o *options) error {
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log.Infof("Starting 'cleanup' for %v", c.App.Name)
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cfg, err := docker.New(
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docker.WithPath(o.Config),
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)
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if err != nil {
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return fmt.Errorf("unable to load config: %v", err)
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}
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err = o.Unconfigure(cfg)
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if err != nil {
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return fmt.Errorf("unable to unconfigure docker: %v", err)
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}
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err = RestartDocker(o)
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if err != nil {
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return fmt.Errorf("unable to signal docker: %v", err)
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}
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log.Infof("Completed 'cleanup' for %v", c.App.Name)
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return nil
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}
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// RestartDocker restarts docker depending on the value of restartModeFlag
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func RestartDocker(o *options) error {
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return o.Restart("docker", SignalDocker)
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}
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// SignalDocker sends a SIGHUP signal to docker daemon
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func SignalDocker(socket string) error {
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log.Infof("Sending SIGHUP signal to docker")
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// Wrap the logic to perform the SIGHUP in a function so we can retry it on failure
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retriable := func() error {
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conn, err := net.Dial("unix", socket)
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if err != nil {
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return fmt.Errorf("unable to dial: %v", err)
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}
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defer conn.Close()
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sconn, err := conn.(*net.UnixConn).SyscallConn()
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if err != nil {
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return fmt.Errorf("unable to get syscall connection: %v", err)
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}
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err1 := sconn.Control(func(fd uintptr) {
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err = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_PASSCRED, 1)
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})
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if err1 != nil {
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return fmt.Errorf("unable to issue call on socket fd: %v", err1)
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}
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if err != nil {
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return fmt.Errorf("unable to SetsockoptInt on socket fd: %v", err)
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}
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_, _, err = conn.(*net.UnixConn).WriteMsgUnix([]byte(socketMessageToGetPID), nil, nil)
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if err != nil {
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return fmt.Errorf("unable to WriteMsgUnix on socket fd: %v", err)
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}
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oob := make([]byte, 1024)
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_, oobn, _, _, err := conn.(*net.UnixConn).ReadMsgUnix(nil, oob)
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if err != nil {
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return fmt.Errorf("unable to ReadMsgUnix on socket fd: %v", err)
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}
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oob = oob[:oobn]
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scm, err := syscall.ParseSocketControlMessage(oob)
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if err != nil {
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return fmt.Errorf("unable to ParseSocketControlMessage from message received on socket fd: %v", err)
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}
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ucred, err := syscall.ParseUnixCredentials(&scm[0])
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if err != nil {
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return fmt.Errorf("unable to ParseUnixCredentials from message received on socket fd: %v", err)
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}
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err = syscall.Kill(int(ucred.Pid), syscall.SIGHUP)
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if err != nil {
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return fmt.Errorf("unable to send SIGHUP to 'docker' process: %v", err)
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}
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return nil
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}
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// Try to send a SIGHUP up to maxReloadAttempts times
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var err error
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for i := 0; i < maxReloadAttempts; i++ {
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err = retriable()
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if err == nil {
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break
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}
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if i == maxReloadAttempts-1 {
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break
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}
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log.Warningf("Error signaling docker, attempt %v/%v: %v", i+1, maxReloadAttempts, err)
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time.Sleep(reloadBackoff)
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}
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if err != nil {
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log.Warningf("Max retries reached %v/%v, aborting", maxReloadAttempts, maxReloadAttempts)
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return err
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}
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log.Infof("Successfully signaled docker")
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return nil
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}
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