minio/pkg/madmin/API.md

Golang Admin Client API Reference

Initialize Minio Admin Client object.

Minio

package main

import (
    "fmt"

    "github.com/minio/minio/pkg/madmin"
)

func main() {
    // Use a secure connection.
    ssl := true

    // Initialize minio client object.
    mdmClnt, err := madmin.New("your-minio.example.com:9000", "YOUR-ACCESSKEYID", "YOUR-SECRETKEY", ssl)
    if err != nil {
        fmt.Println(err)
        return
    }

    // Fetch service status.
    st, err := mdmClnt.ServiceStatus()
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Printf("%#v\n", st)
}

Service operations	LockInfo operations	Healing operations	Config operations	Misc
ServiceStatus	ListLocks	ListObjectsHeal	GetConfig	SetCredentials
ServiceRestart	ClearLocks	ListBucketsHeal	SetConfig
		HealBucket
		HealObject
		HealFormat
		ListUploadsHeal

1. Constructor

New(endpoint string, accessKeyID string, secretAccessKey string, ssl bool) (*AdminClient, error)

Initializes a new admin client object.

Parameters

Param	Type	Description
endpoint	string	Minio endpoint.
accessKeyID	string	Access key for the object storage endpoint.
secretAccessKey	string	Secret key for the object storage endpoint.
ssl	bool	Set this value to 'true' to enable secure (HTTPS) access.

2. Service operations

ServiceStatus() (ServiceStatusMetadata, error)

Fetch service status, replies disk space used, backend type and total disks offline/online (applicable in distributed mode).

Param	Type	Description
serviceStatus	ServiceStatusMetadata	Represents current server status info in following format:

Param	Type	Description
st.ServerVersion.Version	string	Server version.
st.ServerVersion.CommitID	string	Server commit id.
st.StorageInfo.Total	int64	Total disk space.
st.StorageInfo.Free	int64	Free disk space.
st.StorageInfo.Backend	struct{}	Represents backend type embedded structure.

Param	Type	Description
backend.Type	BackendType	Type of backend used by the server currently only FS or Erasure.
backend.OnlineDisks	int	Total number of disks online (only applies to Erasure backend), is empty for FS.
backend.OfflineDisks	int	Total number of disks offline (only applies to Erasure backend), is empty for FS.
backend.ReadQuorum	int	Current total read quorum threshold before reads will be unavailable, is empty for FS.
backend.WriteQuorum	int	Current total write quorum threshold before writes will be unavailable, is empty for FS.

Example

   st, err := madmClnt.ServiceStatus()
   if err != nil {
   	log.Fatalln(err)
   }
   log.Printf("%#v\n", st)

ServiceRestart() (error)

If successful restarts the running minio service, for distributed setup restarts all remote minio servers.

Example

   st, err := madmClnt.ServiceRestart()
   if err != nil {
   	log.Fatalln(err)
   }
   log.Printf("Success")

3. Lock operations

ListLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error)

If successful returns information on the list of locks held on bucket matching prefix for longer than duration seconds.

Example

    volLocks, err := madmClnt.ListLocks("mybucket", "myprefix", 30 * time.Second)
    if err != nil {
        log.Fatalln(err)
    }
    log.Println("List of locks: ", volLocks)

ClearLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error)

If successful returns information on the list of locks cleared on bucket matching prefix for longer than duration seconds.

Example

    volLocks, err := madmClnt.ClearLocks("mybucket", "myprefix", 30 * time.Second)
    if err != nil {
        log.Fatalln(err)
    }
    log.Println("List of locks cleared: ", volLocks)

4. Heal operations

ListObjectsHeal(bucket, prefix string, recursive bool, doneCh <-chan struct{}) (<-chan ObjectInfo, error)

If successful returns information on the list of objects that need healing in bucket matching prefix.

Example

    // Create a done channel to control 'ListObjectsHeal' go routine.
    doneCh := make(chan struct{})

    // Indicate to our routine to exit cleanly upon return.
    defer close(doneCh)

    // Set true if recursive listing is needed.
    isRecursive := true
    // List objects that need healing for a given bucket and
    // prefix.
    healObjectCh, err := madmClnt.ListObjectsHeal("mybucket", "myprefix", isRecursive, doneCh)
    if err != nil {
        fmt.Println(err)
        return
    }
    for object := range healObjectsCh {
        if object.Err != nil {
            log.Fatalln(err)
            return
        }
        if object.HealObjectInfo != nil {
            switch healInfo := *object.HealObjectInfo; healInfo.Status {
            case madmin.CanHeal:
                fmt.Println(object.Key, " can be healed.")
            case madmin.QuorumUnavailable:
                fmt.Println(object.Key, " can't be healed until quorum is available.")
            case madmin.Corrupted:
                fmt.Println(object.Key, " can't be healed, not enough information.")
            }
        }
        fmt.Println("object: ", object)
    }

ListBucketsHeal() error

If successful returns information on the list of buckets that need healing.

Example

    // List buckets that need healing
    healBucketsList, err := madmClnt.ListBucketsHeal()
    if err != nil {
        fmt.Println(err)
        return
    }
    for bucket := range healBucketsList {
        if bucket.HealBucketInfo != nil {
            switch healInfo := *object.HealBucketInfo; healInfo.Status {
            case madmin.CanHeal:
                fmt.Println(bucket.Key, " can be healed.")
            case madmin.QuorumUnavailable:
                fmt.Println(bucket.Key, " can't be healed until quorum is available.")
            case madmin.Corrupted:
                fmt.Println(bucket.Key, " can't be healed, not enough information.")
            }
        }
        fmt.Println("bucket: ", bucket)
    }

HealBucket(bucket string, isDryRun bool) error

If bucket is successfully healed returns nil, otherwise returns error indicating the reason for failure. If isDryRun is true, then the bucket is not healed, but heal bucket request is validated by the server. e.g, if the bucket exists, if bucket name is valid etc.

Example

    isDryRun := false
    err := madmClnt.HealBucket("mybucket", isDryRun)
    if err != nil {
        log.Fatalln(err)
    }
    log.Println("successfully healed mybucket")

HealObject(bucket, object string, isDryRun bool) error

If object is successfully healed returns nil, otherwise returns error indicating the reason for failure. If isDryRun is true, then the object is not healed, but heal object request is validated by the server. e.g, if the object exists, if object name is valid etc.

Example

    isDryRun := false
    err := madmClnt.HealObject("mybucket", "myobject", isDryRun)
    if err != nil {
        log.Fatalln(err)
    }
    log.Println("successfully healed mybucket/myobject")

HealFormat(isDryRun bool) error

Heal storage format on available disks. This is used when disks were replaced or were found with missing format. This is supported only for erasure-coded backend.

Example

    isDryRun := true
    err := madmClnt.HealFormat(isDryRun)
    if err != nil {
        log.Fatalln(err)
    }

    isDryRun = false
    err = madmClnt.HealFormat(isDryRun)
    if err != nil {
        log.Fatalln(err)
    }

    log.Println("successfully healed storage format on available disks.")

5. Config operations

GetConfig() ([]byte, error)

Get config.json of a minio setup.

Example

    configBytes, err := madmClnt.GetConfig()
    if err != nil {
        log.Fatalf("failed due to: %v", err)
    }

    // Pretty-print config received as json.
    var buf bytes.Buffer
    err = json.Indent(buf, configBytes, "", "\t")
    if err != nil {
        log.Fatalf("failed due to: %v", err)
    }

    log.Println("config received successfully: ", string(buf.Bytes()))

6. Misc operations

SetCredentials() error

Set new credentials of a Minio setup.

Example

    err = madmClnt.SetCredentials("YOUR-NEW-ACCESSKEY", "YOUR-NEW-SECRETKEY")
    if err != nil {
            log.Fatalln(err)
    }
    log.Println("New credentials successfully set.")

SetConfig(config io.Reader) (SetConfigResult, error)

Set config.json of a minio setup and restart setup for configuration change to take effect.

Param	Type	Description
st.Status	bool	true if set-config succeeded, false otherwise.
st.NodeSummary.Name	string	Network address of the node.
st.NodeSummary.ErrSet	bool	Bool representation indicating if an error is encountered with the node.
st.NodeSummary.ErrMsg	string	String representation of the error (if any) on the node.

Example

    config := bytes.NewReader([]byte(`config.json contents go here`))
    result, err := madmClnt.SetConfig(config)
    if err != nil {
        log.Fatalf("failed due to: %v", err)
    }

    var buf bytes.Buffer
    enc := json.NewEncoder(&buf)
    enc.SetEscapeHTML(false)
    enc.SetIndent("", "\t")
    err = enc.Encode(result)
    if err != nil {
        log.Fatalln(err)
    }
    log.Println("SetConfig: ", string(buf.Bytes()))

ListUploadsHeal(bucket, prefix string, recursive bool, doneCh <-chan struct{}) (<-chan UploadInfo, error)

List ongoing multipart uploads that need healing.

Param	Type	Description
ui.Key	string	Name of the object being uploaded
ui.UploadID	string	UploadID of the ongoing multipart upload
ui.HealUploadInfo.Status	healStatus	One of Healthy, CanHeal, Corrupted, QuorumUnavailable
ui.Err	error	non-nil if fetching fetching healing information failed

Example

    // Set true if recursive listing is needed.
    isRecursive := true
    // List objects that need healing for a given bucket and
    // prefix.
    healUploadsCh, err := madmClnt.ListUploadsHeal(bucket, prefix, isRecursive, doneCh)
    if err != nil {
        log.Fatalln("Failed to get list of uploads to be healed: ", err)
    }

    for upload := range healUploadsCh {
        if upload.Err != nil {
            log.Println("upload listing error: ", upload.Err)
        }

        if upload.HealUploadInfo != nil {
            switch healInfo := *upload.HealUploadInfo; healInfo.Status {
            case madmin.CanHeal:
                fmt.Println(upload.Key, " can be healed.")
            case madmin.QuorumUnavailable:
                fmt.Println(upload.Key, " can't be healed until quorum is available.")
            case madmin.Corrupted:
                fmt.Println(upload.Key, " can't be healed, not enough information.")
            }
        }
    }