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docker.go
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docker.go
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// Bivac v2.0.0 (https://camptocamp.github.io/bivac)
// Copyright (c) 2019 Camptocamp
// Licensed under Apache-2.0 (https://raw.githubusercontent.com/camptocamp/bivac/master/LICENSE)
// Modifications copyright (c) 2019 Jam Risser <jam@codejam.ninja>
package orchestrators
import (
"bytes"
"fmt"
"io/ioutil"
"os"
"sort"
"strings"
"unicode/utf8"
"github.com/docker/docker/api/types"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/api/types/mount"
docker "github.com/docker/docker/client"
"github.com/docker/docker/pkg/stdcopy"
"golang.org/x/net/context"
"github.com/codejamninja/volback/pkg/volume"
)
// DockerConfig stores Docker configuration
type DockerConfig struct {
Endpoint string
}
// DockerOrchestrator implements a container orchestrator for Docker
type DockerOrchestrator struct {
client docker.CommonAPIClient
}
// NewDockerOrchestrator creates a Docker client
func NewDockerOrchestrator(config *DockerConfig) (o *DockerOrchestrator, err error) {
o = &DockerOrchestrator{}
o.client, err = docker.NewClient(config.Endpoint, "", nil, nil)
if err != nil {
err = fmt.Errorf("failed to create a Docker client: %s", err)
}
return
}
// GetName returns the orchestrator's name
func (o *DockerOrchestrator) GetName() string {
return "docker"
}
// GetPath returns the backup path
func (*DockerOrchestrator) GetPath(v *volume.Volume) string {
return v.Hostname
}
// GetVolumes returns the Docker volumes, inspected and filtered
func (o *DockerOrchestrator) GetVolumes(volumeFilters volume.Filters) (volumes []*volume.Volume, err error) {
info, err := o.client.Info(context.Background())
if err != nil {
err = fmt.Errorf("failed to retrieve Docker engine info: %s", err)
return
}
vols, err := o.client.VolumeList(context.Background(), filters.NewArgs())
if err != nil {
err = fmt.Errorf("failed to list Docker volumes: %v", err)
return
}
var voll types.Volume
for _, vol := range vols.Volumes {
voll, err = o.client.VolumeInspect(context.Background(), vol.Name)
if err != nil {
err = fmt.Errorf("failed to inspect volume `%s': %v", vol.Name, err)
return
}
v := &volume.Volume{
ID: voll.Name,
Name: voll.Name,
Mountpoint: voll.Mountpoint,
HostBind: info.Name,
Hostname: info.Name,
Labels: voll.Labels,
Logs: make(map[string]string),
RepoName: voll.Name,
SubPath: "",
}
if b, _, _ := o.blacklistedVolume(v, volumeFilters); b {
continue
}
volumes = append(volumes, v)
}
return
}
// DeployAgent creates a `volback agent` container
func (o *DockerOrchestrator) DeployAgent(image string, cmd []string, envs []string, v *volume.Volume) (success bool, output string, err error) {
success = false
err = o.PullImage(image)
if err != nil {
err = fmt.Errorf("failed to pull image: %s", err)
return
}
additionalVolumes, err := o.getAdditionalVolumes()
if err != nil {
err = fmt.Errorf("failed to get additional volumes: %s", err)
return
}
mounts := []mount.Mount{
mount.Mount{
Type: "volume",
Target: v.Mountpoint,
Source: v.Name,
ReadOnly: v.ReadOnly,
},
}
mounts = append(mounts, additionalVolumes...)
container, err := o.client.ContainerCreate(
context.Background(),
&containertypes.Config{
Hostname: createAgentName(),
Cmd: cmd,
Env: envs,
Image: image,
OpenStdin: true,
StdinOnce: true,
AttachStdin: true,
AttachStdout: true,
AttachStderr: true,
Tty: false,
},
&containertypes.HostConfig{
Mounts: mounts,
}, nil, "")
if err != nil {
err = fmt.Errorf("failed to create container: %s", err)
return
}
defer o.RemoveContainer(container.ID)
err = o.client.ContainerStart(context.Background(), container.ID, types.ContainerStartOptions{})
if err != nil {
err = fmt.Errorf("failed to start container: %s", err)
return
}
var exited bool
for !exited {
var cont types.ContainerJSON
cont, err = o.client.ContainerInspect(context.Background(), container.ID)
if err != nil {
err = fmt.Errorf("failed to inspect container: %s", err)
return
}
if cont.State.Status == "exited" {
exited = true
}
}
body, err := o.client.ContainerLogs(context.Background(), container.ID, types.ContainerLogsOptions{
ShowStdout: true,
ShowStderr: true,
Details: true,
Follow: true,
})
if err != nil {
err = fmt.Errorf("failed to retrieve logs: %s", err)
return
}
defer body.Close()
stdout := new(bytes.Buffer)
_, err = stdcopy.StdCopy(stdout, ioutil.Discard, body)
if err != nil {
err = fmt.Errorf("failed to read logs from response: %s", err)
return
}
logs := strings.Split(stdout.String(), "\n")
if len(logs) > 1 {
output = logs[len(logs)-2]
}
success = true
return
}
// RemoveContainer removes a container based on its ID
func (o *DockerOrchestrator) RemoveContainer(containerID string) (err error) {
err = o.client.ContainerRemove(context.Background(), containerID, types.ContainerRemoveOptions{
Force: true,
RemoveVolumes: true,
})
return
}
// DetectDocker tries to detect a Docker orchestrator by connecting to the endpoint
func DetectDocker(config *DockerConfig) bool {
client, err := docker.NewClient(config.Endpoint, "", nil, nil)
if err != nil {
return false
}
_, err = client.Ping(context.Background())
if err != nil {
return false
}
return true
}
// PullImage pulls a Docker image
func (o *DockerOrchestrator) PullImage(image string) (err error) {
if _, _, err = o.client.ImageInspectWithRaw(context.Background(), image); err != nil {
resp, err := o.client.ImagePull(context.Background(), image, types.ImagePullOptions{})
if err != nil {
return err
}
defer resp.Close()
_, err = ioutil.ReadAll(resp)
if err != nil {
err = fmt.Errorf("failed to read ImagePull response: %s", err)
return err
}
}
return nil
}
// GetContainersMountingVolume returns mounted volumes
func (o *DockerOrchestrator) GetContainersMountingVolume(v *volume.Volume) (mountedVolumes []*volume.MountedVolume, err error) {
c, err := o.client.ContainerList(context.Background(), types.ContainerListOptions{})
if err != nil {
err = fmt.Errorf("failed to list containers: %s", err)
return
}
for _, container := range c {
for _, mount := range container.Mounts {
if mount.Name == v.Name && mount.Type == "volume" {
mv := &volume.MountedVolume{
ContainerID: container.ID,
Volume: v,
Path: mount.Destination,
}
mountedVolumes = append(mountedVolumes, mv)
}
}
}
return
}
// ContainerExec executes a command in a container
func (o *DockerOrchestrator) ContainerExec(mountedVolumes *volume.MountedVolume, command []string) (stdout string, err error) {
exec, err := o.client.ContainerExecCreate(context.Background(), mountedVolumes.ContainerID, types.ExecConfig{
AttachStdout: true,
AttachStderr: true,
Cmd: command,
})
if err != nil {
err = fmt.Errorf("failed to create exec: %s", err)
return
}
conn, err := o.client.ContainerExecAttach(context.Background(), exec.ID, types.ExecStartCheck{})
if err != nil {
err = fmt.Errorf("failed to attach: %s", err)
return
}
defer conn.Close()
err = o.client.ContainerExecStart(context.Background(), exec.ID, types.ExecStartCheck{})
if err != nil {
err = fmt.Errorf("failed to start exec: %s", err)
return
}
stdoutput := new(bytes.Buffer)
stdcopy.StdCopy(stdoutput, ioutil.Discard, conn.Reader)
stdout = stdoutput.String()
return
}
// IsNodeAvailable checks if the node is available to run backups on it
func (o *DockerOrchestrator) IsNodeAvailable(hostID string) (ok bool, err error) {
// We can assume that, if Volback is running then, the Docker daemon is available
ok = true
return
}
// RetrieveOrphanAgents returns the list of orphan Volback agents
func (o *DockerOrchestrator) RetrieveOrphanAgents() (containers map[string]string, err error) {
c, err := o.client.ContainerList(context.Background(), types.ContainerListOptions{})
if err != nil {
err = fmt.Errorf("failed to list containers: %s", err)
return
}
for _, container := range c {
if !strings.HasPrefix(container.ID, "volback-agent-") {
continue
}
for _, mount := range container.Mounts {
if mount.Type == "volume" {
containers[mount.Name] = container.ID
}
}
}
return
}
// AttachOrphanAgent connects to a running agent and wait for the end of the backup proccess
func (o *DockerOrchestrator) AttachOrphanAgent(containerID, namespace string) (success bool, output string, err error) {
container, err := o.client.ContainerInspect(context.Background(), containerID)
if err != nil {
err = fmt.Errorf("failed to inspect container: %s", err)
return
}
defer o.RemoveContainer(container.ID)
err = o.client.ContainerStart(context.Background(), container.ID, types.ContainerStartOptions{})
if err != nil {
err = fmt.Errorf("failed to start container: %s", err)
return
}
var exited bool
for !exited {
var cont types.ContainerJSON
cont, err = o.client.ContainerInspect(context.Background(), container.ID)
if err != nil {
err = fmt.Errorf("failed to inspect container: %s", err)
return
}
if cont.State.Status == "exited" {
exited = true
}
}
body, err := o.client.ContainerLogs(context.Background(), container.ID, types.ContainerLogsOptions{
ShowStdout: true,
ShowStderr: true,
Details: true,
Follow: true,
})
if err != nil {
err = fmt.Errorf("failed to retrieve logs: %s", err)
return
}
defer body.Close()
stdout := new(bytes.Buffer)
_, err = stdcopy.StdCopy(stdout, ioutil.Discard, body)
if err != nil {
err = fmt.Errorf("failed to read logs from response: %s", err)
return
}
logs := strings.Split(stdout.String(), "\n")
if len(logs) > 1 {
output = logs[len(logs)-2]
}
success = true
return
}
func (o *DockerOrchestrator) blacklistedVolume(vol *volume.Volume, volumeFilters volume.Filters) (bool, string, string) {
if utf8.RuneCountInString(vol.Name) == 64 || vol.Name == "lost+found" {
return true, "unnamed", ""
}
// Check labels
if ignored, ok := vol.Labels["volback.ignore"]; ok && ignored == "true" {
return true, "ignored", "volume config"
}
// Use whitelist if defined
if l := volumeFilters.Whitelist; len(l) > 0 && l[0] != "" {
sort.Strings(l)
i := sort.SearchStrings(l, vol.Name)
if i < len(l) && l[i] == vol.Name {
return false, "", ""
}
return true, "blacklisted", "whitelist config"
}
i := sort.SearchStrings(volumeFilters.Blacklist, vol.Name)
if i < len(volumeFilters.Blacklist) && volumeFilters.Blacklist[i] == vol.Name {
return true, "blacklisted", "blacklist config"
}
return false, "", ""
}
func (o *DockerOrchestrator) getAdditionalVolumes() (mounts []mount.Mount, err error) {
mounts = []mount.Mount{}
managerHostname, err := os.Hostname()
if err != nil {
err = fmt.Errorf("failed to retrieve hostname: %s", err)
return
}
managerContainer, err := o.client.ContainerInspect(context.Background(), managerHostname)
if err != nil {
if strings.Contains(err.Error(), "No such container") {
// We assume Volback is running outside the orchestrator
err = nil
} else {
err = fmt.Errorf("failed to inspect container: %s", err)
}
return
}
for _, v := range managerContainer.Mounts {
mounts = append(mounts, mount.Mount{
Type: v.Type,
Source: v.Source,
Target: v.Destination,
ReadOnly: !v.RW,
})
}
return
}