mirror of
https://github.com/offen/docker-volume-backup.git
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Merge pull request #24 from offen/failure-email
Enable sending out email notifications on failed backups
This commit is contained in:
GitHub
commit
5d400cb943
56
README.md
56
README.md
@ -12,6 +12,7 @@ It handles __recurring or one-off backups of Docker volumes__ to a __local direc
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- [How to](#how-to)
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- [Stopping containers during backup](#stopping-containers-during-backup)
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- [Automatically pruning old backups](#automatically-pruning-old-backups)
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- [Send email notifications on failed backup runs](#send-email-notifications-on-failed-backup-runs)
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- [Encrypting your backup using GPG](#encrypting-your-backup-using-gpg)
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- [Restoring a volume from a backup](#restoring-a-volume-from-a-backup)
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- [Using with Docker Swarm](#using-with-docker-swarm)
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@ -55,6 +56,10 @@ services:
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- docker-volume-backup.stop-during-backup=true
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backup:
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# In production, it is advised to lock your image tag to a proper
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# release version instead of using `latest`.
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# Check https://github.com/offen/docker-volume-backup/releases
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# for a list of available releases.
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image: offen/docker-volume-backup:latest
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restart: always
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env_file: ./backup.env # see below for configuration reference
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@ -188,6 +193,38 @@ You can populate below template according to your requirements and use it as you
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# override this default by specifying a different value here.
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# BACKUP_STOP_CONTAINER_LABEL="service1"
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########### EMAIL NOTIFICATIONS ON FAILED BACKUP RUNS
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# In case SMTP credentials are provided, notification emails can be sent out on
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# failed backup runs. These emails will contain the start time, the error
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# message and all log output prior to the failure.
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# The recipient(s) of the notification. Supply a comma separated list
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# of adresses if you want to notify multiple recipients. If this is
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# not set, no emails will be sent.
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# EMAIL_NOTIFICATION_RECIPIENT="you@example.com"
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# The "From" header of the sent email. Defaults to `noreply@nohost`.
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# EMAIL_NOTIFICATION_SENDER="no-reply@example.com"
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# The hostname of your SMTP server.
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# EMAIL_SMTP_HOST="posteo.de"
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# The SMTP password.
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# EMAIL_SMTP_PASSWORD="<xxx>"
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# The SMTP username.
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# EMAIL_SMTP_USERNAME="no-reply@example.com"
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The port used when communicating with the server. Defaults to 587.
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# EMAIL_SMTP_PORT="<port>"
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```
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## How to
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@ -247,6 +284,25 @@ volumes:
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data:
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```
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### Send email notifications on failed backup runs
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To send out email notifications on failed backup runs, provide SMTP credentials, a sender and a recipient:
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```yml
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version: '3'
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services:
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backup:
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image: offen/docker-volume-backup:latest
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environment:
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# ... other configuration values go here
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EMAIL_SMTP_HOST: "smtp.example.com"
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EMAIL_SMTP_PASSWORD: "password"
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EMAIL_SMTP_USERNAME: "username"
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EMAIL_NOTIFICATION_SENDER: "noreply@example.com"
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EMAIL_NOTIFICATION_RECIPIENT: "notifications@example.com"
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```
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### Encrypting your backup using GPG
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The image supports encrypting backups using GPG out of the box.
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@ -4,6 +4,7 @@
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package main
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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@ -18,6 +19,7 @@ import (
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"github.com/docker/docker/api/types/filters"
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"github.com/docker/docker/api/types/swarm"
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"github.com/docker/docker/client"
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"github.com/go-gomail/gomail"
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"github.com/gofrs/flock"
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"github.com/kelseyhightower/envconfig"
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"github.com/leekchan/timeutil"
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@ -61,13 +63,17 @@ type script struct {
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cli *client.Client
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mc *minio.Client
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logger *logrus.Logger
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errorHooks []errorHook
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start time.Time
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file string
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output *bytes.Buffer
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c *config
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}
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type errorHook func(err error, start time.Time, logOutput string) error
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type config struct {
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BackupSources string `split_words:"true" default:"/backup"`
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BackupFilename string `split_words:"true" default:"backup-%Y-%m-%dT%H-%M-%S.tar.gz"`
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@ -83,6 +89,12 @@ type config struct {
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AwsAccessKeyID string `envconfig:"AWS_ACCESS_KEY_ID"`
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AwsSecretAccessKey string `split_words:"true"`
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GpgPassphrase string `split_words:"true"`
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EmailNotificationRecipient string `split_words:"true"`
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EmailNotificationSender string `split_words:"true" default:"noreply@nohost"`
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EmailSMTPHost string `envconfig:"EMAIL_SMTP_HOST"`
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EmailSMTPPort int `envconfig:"EMAIL_SMTP_PORT" default:"587"`
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EmailSMTPUsername string `envconfig:"EMAIL_SMTP_USERNAME"`
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EmailSMTPPassword string `envconfig:"EMAIL_SMTP_PASSWORD"`
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}
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// newScript creates all resources needed for the script to perform actions against
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@ -90,15 +102,17 @@ type config struct {
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// reading from env vars or other configuration sources is expected to happen
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// in this method.
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func newScript() (*script, error) {
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stdOut, logBuffer := buffer(os.Stdout)
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s := &script{
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c: &config{},
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logger: &logrus.Logger{
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Out: os.Stdout,
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Out: stdOut,
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Formatter: new(logrus.TextFormatter),
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Hooks: make(logrus.LevelHooks),
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Level: logrus.InfoLevel,
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},
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start: time.Now(),
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output: logBuffer,
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}
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if err := envconfig.Process("", s.c); err != nil {
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@ -131,6 +145,28 @@ func newScript() (*script, error) {
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s.mc = mc
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}
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if s.c.EmailNotificationRecipient != "" {
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s.errorHooks = append(s.errorHooks, func(err error, start time.Time, logOutput string) error {
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mailer := gomail.NewDialer(
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s.c.EmailSMTPHost, s.c.EmailSMTPPort, s.c.EmailSMTPUsername, s.c.EmailSMTPPassword,
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)
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subject := fmt.Sprintf(
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"Failure running docker-volume-backup at %s", start.Format(time.RFC3339),
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)
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body := fmt.Sprintf(
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"Running docker-volume-backup failed with error: %s\n\nLog output before the error occurred:\n\n%s\n", err, logOutput,
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)
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message := gomail.NewMessage()
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message.SetHeader("From", s.c.EmailNotificationSender)
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message.SetHeader("To", s.c.EmailNotificationRecipient)
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message.SetHeader("Subject", subject)
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message.SetBody("text/plain", body)
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return mailer.DialAndSend(message)
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})
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}
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return s, nil
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}
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@ -469,9 +505,15 @@ func (s *script) pruneOldBackups() error {
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}
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// must exits the script run non-zero and prematurely in case the given error
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// is non-nil.
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// is non-nil. If error hooks are present on the script object, they
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// will be called, passing the failure and previous log output.
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func (s *script) must(err error) {
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if err != nil {
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for _, hook := range s.errorHooks {
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if hookErr := hook(err, s.start, s.output.String()); hookErr != nil {
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s.logger.Errorf("An error occurred calling an error hook: %s", hookErr)
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}
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}
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s.logger.Fatalf("Fatal error running backup: %s", err)
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}
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}
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@ -526,3 +568,22 @@ func join(errs ...error) error {
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}
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return errors.New("[" + strings.Join(msgs, ", ") + "]")
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}
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// buffer takes an io.Writer and returns a wrapped version of the
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// writer that writes to both the original target as well as the returned buffer
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func buffer(w io.Writer) (io.Writer, *bytes.Buffer) {
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buffering := &bufferingWriter{buf: bytes.Buffer{}, writer: w}
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return buffering, &buffering.buf
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}
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type bufferingWriter struct {
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buf bytes.Buffer
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writer io.Writer
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}
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func (b *bufferingWriter) Write(p []byte) (n int, err error) {
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if n, err := b.buf.Write(p); err != nil {
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return n, fmt.Errorf("bufferingWriter: error writing to buffer: %w", err)
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}
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return b.writer.Write(p)
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}
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2
go.mod
2
go.mod
@ -20,6 +20,7 @@ require (
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github.com/docker/go-connections v0.4.0 // indirect
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github.com/docker/go-units v0.4.0 // indirect
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github.com/dustin/go-humanize v1.0.0 // indirect
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github.com/go-gomail/gomail v0.0.0-20160411212932-81ebce5c23df // indirect
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github.com/gogo/protobuf v1.3.2 // indirect
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github.com/golang/protobuf v1.5.0 // indirect
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github.com/google/uuid v1.2.0 // indirect
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@ -41,5 +42,6 @@ require (
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google.golang.org/genproto v0.0.0-20201110150050-8816d57aaa9a // indirect
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google.golang.org/grpc v1.33.2 // indirect
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google.golang.org/protobuf v1.26.0 // indirect
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gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
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gopkg.in/ini.v1 v1.57.0 // indirect
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)
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4
go.sum
4
go.sum
@ -254,6 +254,8 @@ github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeME
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github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
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github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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github.com/go-gomail/gomail v0.0.0-20160411212932-81ebce5c23df h1:Bao6dhmbTA1KFVxmJ6nBoMuOJit2yjEgLJpIMYpop0E=
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github.com/go-gomail/gomail v0.0.0-20160411212932-81ebce5c23df/go.mod h1:GJr+FCSXshIwgHBtLglIg9M2l2kQSi6QjVAngtzI08Y=
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github.com/go-ini/ini v1.25.4/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
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github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
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github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
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@ -908,6 +910,8 @@ google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/l
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google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
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gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
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gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
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gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc h1:2gGKlE2+asNV9m7xrywl36YYNnBG5ZQ0r/BOOxqPpmk=
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gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/check.v1 v1.0.0-20141024133853-64131543e789/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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