summaryrefslogtreecommitdiff
path: root/libpod/runtime_migrate.go
blob: 1ad32fe9cf6b86dd2e52238a50cc262ce5f0bf4e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
// +build linux

package libpod

import (
	"context"
	"fmt"
	"io/ioutil"
	"os"
	"path/filepath"
	"strconv"
	"syscall"

	"github.com/containers/podman/v2/libpod/define"
	"github.com/containers/podman/v2/pkg/rootless"
	"github.com/containers/podman/v2/pkg/util"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

func stopPauseProcess() error {
	if rootless.IsRootless() {
		pausePidPath, err := util.GetRootlessPauseProcessPidPath()
		if err != nil {
			return errors.Wrapf(err, "could not get pause process pid file path")
		}
		data, err := ioutil.ReadFile(pausePidPath)
		if err != nil {
			if os.IsNotExist(err) {
				return nil
			}
			return errors.Wrap(err, "cannot read pause process pid file")
		}
		pausePid, err := strconv.Atoi(string(data))
		if err != nil {
			return errors.Wrapf(err, "cannot parse pause pid file %s", pausePidPath)
		}
		if err := os.Remove(pausePidPath); err != nil {
			return errors.Wrapf(err, "cannot delete pause pid file %s", pausePidPath)
		}
		if err := syscall.Kill(pausePid, syscall.SIGKILL); err != nil {
			return err
		}
	}
	return nil
}

func (r *Runtime) migrate(ctx context.Context) error {
	runningContainers, err := r.GetRunningContainers()
	if err != nil {
		return err
	}

	allCtrs, err := r.state.AllContainers()
	if err != nil {
		return err
	}

	logrus.Infof("stopping all containers")
	for _, ctr := range runningContainers {
		fmt.Printf("stopped %s\n", ctr.ID())
		if err := ctr.Stop(); err != nil {
			return errors.Wrapf(err, "cannot stop container %s", ctr.ID())
		}
	}

	// Did the user request a new runtime?
	runtimeChangeRequested := r.migrateRuntime != ""
	requestedRuntime, runtimeExists := r.ociRuntimes[r.migrateRuntime]
	if !runtimeExists && runtimeChangeRequested {
		return errors.Wrapf(define.ErrInvalidArg, "change to runtime %q requested but no such runtime is defined", r.migrateRuntime)
	}

	for _, ctr := range allCtrs {
		needsWrite := false

		// Reset pause process location
		oldLocation := filepath.Join(ctr.state.RunDir, "conmon.pid")
		if ctr.config.ConmonPidFile == oldLocation {
			logrus.Infof("changing conmon PID file for %s", ctr.ID())
			ctr.config.ConmonPidFile = filepath.Join(ctr.config.StaticDir, "conmon.pid")
			needsWrite = true
		}

		// Reset runtime
		if runtimeChangeRequested {
			logrus.Infof("Resetting container %s runtime to runtime %s", ctr.ID(), r.migrateRuntime)
			ctr.config.OCIRuntime = r.migrateRuntime
			ctr.ociRuntime = requestedRuntime

			needsWrite = true
		}

		if needsWrite {
			if err := r.state.RewriteContainerConfig(ctr, ctr.config); err != nil {
				return errors.Wrapf(err, "error rewriting config for container %s", ctr.ID())
			}
		}
	}

	return stopPauseProcess()
}