Golang Admin Client API Reference Slack

The MinIO Admin Golang Client SDK provides APIs to manage MinIO services.

This quickstart guide will show you how to install the MinIO Admin client SDK, connect to MinIO admin service, and provide a walkthrough of a simple file uploader.

This document assumes that you have a working Golang setup.

Initialize MinIO Admin Client object.

MinIO

package main

import (
    "fmt"

    "github.com/minio/madmin-go"
)

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.ServerInfo()
    if err != nil {
        fmt.Println(err)
        return
    }
	for _, peerInfo := range serversInfo {
		log.Printf("Node: %s, Info: %v\n", peerInfo.Addr, peerInfo.Data)
	}
}
Service operations Info operations Healing operations Config operations
ServiceTrace ServerInfo Heal GetConfig
ServiceStop StorageInfo SetConfig
ServiceRestart AccountInfo
Top operations IAM operations Misc KMS
TopLocks AddUser StartProfiling GetKeyStatus
SetPolicy DownloadProfilingData
ListUsers ServerUpdate
AddCannedPolicy

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(ctx context.Context) (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.Uptime time.Duration Server uptime duration in seconds.

Example

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

ServiceRestart(ctx context.Context) error

Sends a service action restart command to MinIO server.

Example

   // To restart the service, restarts all servers in the cluster.
   err := madmClnt.ServiceRestart(context.Background())
   if err != nil {
       log.Fatalln(err)
   }
   log.Println("Success")

ServiceStop(ctx context.Context) error

Sends a service action stop command to MinIO server.

Example

   // To stop the service, stops all servers in the cluster.
   err := madmClnt.ServiceStop(context.Background())
   if err != nil {
       log.Fatalln(err)
   }
   log.Println("Success")

ServiceTrace(ctx context.Context, allTrace bool, doneCh <-chan struct{}) <-chan TraceInfo

Enable HTTP request tracing on all nodes in a MinIO cluster

Example

    doneCh := make(chan struct{})
    defer close(doneCh)
    // listen to all trace including internal API calls
    allTrace := true
    // Start listening on all trace activity.
    traceCh := madmClnt.ServiceTrace(context.Background(), allTrace, doneCh)
    for traceInfo := range traceCh {
        fmt.Println(traceInfo.String())
    }

3. Info operations

ServerInfo(ctx context.Context) ([]ServerInfo, error)

Fetches information for all cluster nodes, such as server properties, storage information, network statistics, etc.

Param Type Description
si.Addr string Address of the server the following information is retrieved from.
si.ConnStats ServerConnStats Connection statistics from the given server.
si.HTTPStats ServerHTTPStats HTTP connection statistics from the given server.
si.Properties ServerProperties Server properties such as region, notification targets.
Param Type Description
ServerProperties.Uptime time.Duration Total duration in seconds since server is running.
ServerProperties.Version string Current server version.
ServerProperties.CommitID string Current server commitID.
ServerProperties.Region string Configured server region.
ServerProperties.SQSARN []string List of notification target ARNs.
Param Type Description
ServerConnStats.TotalInputBytes uint64 Total bytes received by the server.
ServerConnStats.TotalOutputBytes uint64 Total bytes sent by the server.
Param Type Description
ServerHTTPStats.TotalHEADStats ServerHTTPMethodStats Total statistics regarding HEAD operations
ServerHTTPStats.SuccessHEADStats ServerHTTPMethodStats Total statistics regarding successful HEAD operations
ServerHTTPStats.TotalGETStats ServerHTTPMethodStats Total statistics regarding GET operations
ServerHTTPStats.SuccessGETStats ServerHTTPMethodStats Total statistics regarding successful GET operations
ServerHTTPStats.TotalPUTStats ServerHTTPMethodStats Total statistics regarding PUT operations
ServerHTTPStats.SuccessPUTStats ServerHTTPMethodStats Total statistics regarding successful PUT operations
ServerHTTPStats.TotalPOSTStats ServerHTTPMethodStats Total statistics regarding POST operations
ServerHTTPStats.SuccessPOSTStats ServerHTTPMethodStats Total statistics regarding successful POST operations
ServerHTTPStats.TotalDELETEStats ServerHTTPMethodStats Total statistics regarding DELETE operations
ServerHTTPStats.SuccessDELETEStats ServerHTTPMethodStats Total statistics regarding successful DELETE operations
Param Type Description
ServerHTTPMethodStats.Count uint64 Total number of operations.
ServerHTTPMethodStats.AvgDuration string Average duration of Count number of operations.
Param Type Description
DriveInfo.UUID string Unique ID for each disk provisioned by server format.
DriveInfo.Endpoint string Endpoint location of the remote/local disk.
DriveInfo.State string Current state of the disk at endpoint.

Example

   serversInfo, err := madmClnt.ServerInfo(context.Background())
   if err != nil {
   	log.Fatalln(err)
   }

   for _, peerInfo := range serversInfo {
   	log.Printf("Node: %s, Info: %v\n", peerInfo.Addr, peerInfo.Data)
   }

StorageInfo(ctx context.Context) (StorageInfo, error)

Fetches Storage information for all cluster nodes.

Param Type Description
storageInfo.Used []int64 Used disk spaces.
storageInfo.Total []int64 Total disk spaces.
storageInfo.Available []int64 Available disk spaces.
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 BackendDisks Total number of disks online per node (only applies to Erasure backend) represented in map[string]int, is empty for FS.
Backend.OfflineDisks BackendDisks Total number of disks offline per node (only applies to Erasure backend) represented in map[string]int, is empty for FS.
Backend.StandardSCParity int Parity disks set for standard storage class, is empty for FS.
Backend.RRSCParity int Parity disks set for reduced redundancy storage class, is empty for FS.
Backend.Sets [][]DriveInfo Represents topology of drives in erasure coded sets.

Example

   storageInfo, err := madmClnt.StorageInfo(context.Background())
   if err != nil {
   	log.Fatalln(err)
   }

   log.Println(storageInfo)

AccountInfo(ctx context.Context) (AccountInfo, error)

Fetches accounting usage information for the current authenticated user

Param Type Description
AccountInfo.AccountName string Account name.
AccountInfo.Buckets []BucketAccessInfo Bucket usage info.
Param Type Description
BucketAccessInfo.Name string The name of the current bucket
BucketAccessInfo.Size uint64 The total size of the current bucket
BucketAccessInfo.Created time.Time Bucket creation time
BucketAccessInfo.Access AccountAccess Type of access of the current account
Param Type Description
AccountAccess.Read bool Indicate if the bucket is readable by the current account name.
AccountAccess.Write bool Indocate if the bucket is writable by the current account name.

Example

   accountInfo, err := madmClnt.AccountInfo(context.Background())
   if err != nil {
	log.Fatalln(err)
   }

   log.Println(accountInfo)

5. Heal operations

Heal(ctx context.Context, bucket, prefix string, healOpts HealOpts, clientToken string, forceStart bool, forceStop bool) (start HealStartSuccess, status HealTaskStatus, err error)

Start a heal sequence that scans data under given (possible empty) bucket and prefix. The recursive bool turns on recursive traversal under the given path. dryRun does not mutate on-disk data, but performs data validation.

Two heal sequences on overlapping paths may not be initiated.

The progress of a heal should be followed using the same API Heal by providing the clientToken previously obtained from a Heal API. The server accumulates results of the heal traversal and waits for the client to receive and acknowledge them using the status request by providing clientToken.

Example

    opts := madmin.HealOpts{
            Recursive: true,
            DryRun:    false,
    }
    forceStart := false
    forceStop := false
    healPath, err := madmClnt.Heal(context.Background(), "", "", opts, "", forceStart, forceStop)
    if err != nil {
        log.Fatalln(err)
    }
    log.Printf("Heal sequence started at %s", healPath)

HealStartSuccess structure

Param Type Description
s.ClientToken string A unique token for a successfully started heal operation, this token is used to request realtime progress of the heal operation.
s.ClientAddress string Address of the client which initiated the heal operation, the client address has the form “host:port”.
s.StartTime time.Time Time when heal was initially started.

HealTaskStatus structure

Param Type Description
s.Summary string Short status of heal sequence
s.FailureDetail string Error message in case of heal sequence failure
s.HealSettings HealOpts Contains the booleans set in the HealStart call
s.Items []HealResultItem Heal records for actions performed by server

HealResultItem structure

Param Type Description
ResultIndex int64 Index of the heal-result record
Type HealItemType Represents kind of heal operation in the heal record
Bucket string Bucket name
Object string Object name
Detail string Details about heal operation
DiskInfo.AvailableOn []int List of disks on which the healed entity is present and healthy
DiskInfo.HealedOn []int List of disks on which the healed entity was restored
l

6. Config operations

GetConfig(ctx context.Context) ([]byte, error)

Get current config.json of a MinIO server.

Example

    configBytes, err := madmClnt.GetConfig(context.Background())
    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()))

SetConfig(ctx context.Context, config io.Reader) error

Set a new config.json for a MinIO server.

Example

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

7. Top operations

TopLocks(ctx context.Context) (LockEntries, error)

Get the oldest locks from MinIO server.

Example

    locks, err := madmClnt.TopLocks(context.Background())
    if err != nil {
        log.Fatalf("failed due to: %v", err)
    }

    out, err := json.Marshal(locks)
    if err != nil {
        log.Fatalf("Marshal failed due to: %v", err)
    }

    log.Println("TopLocks received successfully: ", string(out))

8. IAM operations

AddCannedPolicy(ctx context.Context, policyName string, policy *iampolicy.Policy) error

Create a new canned policy on MinIO server.

Example

	policy, err := iampolicy.ParseConfig(strings.NewReader(`{"Version": "2012-10-17","Statement": [{"Action": ["s3:GetObject"],"Effect": "Allow","Resource": ["arn:aws:s3:::my-bucketname/*"],"Sid": ""}]}`))
    if err != nil {
        log.Fatalln(err)
    }

    if err = madmClnt.AddCannedPolicy(context.Background(), "get-only", policy); err != nil {
		log.Fatalln(err)
	}

AddUser(ctx context.Context, user string, secret string) error

Add a new user on a MinIO server.

Example

	if err = madmClnt.AddUser(context.Background(), "newuser", "newstrongpassword"); err != nil {
		log.Fatalln(err)
	}

SetPolicy(ctx context.Context, policyName, entityName string, isGroup bool) error

Enable a canned policy get-only for a given user or group on MinIO server.

Example

	if err = madmClnt.SetPolicy(context.Background(), "get-only", "newuser", false); err != nil {
		log.Fatalln(err)
	}

ListUsers(ctx context.Context) (map[string]UserInfo, error)

Lists all users on MinIO server.

Example

	users, err := madmClnt.ListUsers(context.Background());
    if err != nil {
		log.Fatalln(err)
	}
    for k, v := range users {
        fmt.Printf("User %s Status %s\n", k, v.Status)
    }

9. Misc operations

ServerUpdate(ctx context.Context, updateURL string) (ServerUpdateStatus, error)

Sends a update command to MinIO server, to update MinIO server to latest release. In distributed setup it updates all servers atomically.

Example

   // Updates all servers and restarts all the servers in the cluster.
   // optionally takes an updateURL, which is used to update the binary.
   us, err := madmClnt.ServerUpdate(context.Background(), updateURL)
   if err != nil {
       log.Fatalln(err)
   }
   if us.CurrentVersion != us.UpdatedVersion {
       log.Printf("Updated server version from %s to %s successfully", us.CurrentVersion, us.UpdatedVersion)
   }

StartProfiling(ctx context.Context, profiler string) error

Ask all nodes to start profiling using the specified profiler mode

Example

    startProfilingResults, err = madmClnt.StartProfiling(context.Background(), "cpu")
    if err != nil {
            log.Fatalln(err)
    }
    for _, result := range startProfilingResults {
        if !result.Success {
            log.Printf("Unable to start profiling on node `%s`, reason = `%s`\n", result.NodeName, result.Error)
        } else {
            log.Printf("Profiling successfully started on node `%s`\n", result.NodeName)
        }
    }

DownloadProfilingData(ctx context.Context) ([]byte, error)

Download profiling data of all nodes in a zip format.

Example

    profilingData, err := madmClnt.DownloadProfilingData(context.Background())
    if err != nil {
            log.Fatalln(err)
    }

    profilingFile, err := os.Create("/tmp/profiling-data.zip")
    if err != nil {
            log.Fatal(err)
    }

    if _, err := io.Copy(profilingFile, profilingData); err != nil {
            log.Fatal(err)
    }

    if err := profilingFile.Close(); err != nil {
            log.Fatal(err)
    }

    if err := profilingData.Close(); err != nil {
            log.Fatal(err)
    }

    log.Println("Profiling data successfully downloaded.")

11. KMS

GetKeyStatus(ctx context.Context, keyID string) (*KMSKeyStatus, error)

Requests status information about one particular KMS master key from a MinIO server. The keyID is optional and the server will use the default master key (configured via MINIO_KMS_VAULT_KEY_NAME or MINIO_KMS_MASTER_KEY) if the keyID is empty.

Example

    keyInfo, err := madmClnt.GetKeyStatus(context.Background(), "my-minio-key")
    if err != nil {
       log.Fatalln(err)
    }
    if keyInfo.EncryptionErr != "" {
       log.Fatalf("Failed to perform encryption operation using '%s': %v\n", keyInfo.KeyID, keyInfo.EncryptionErr)
    }
    if keyInfo.UpdateErr != "" {
       log.Fatalf("Failed to perform key re-wrap operation using '%s': %v\n", keyInfo.KeyID, keyInfo.UpdateErr)
    }
    if keyInfo.DecryptionErr != "" {
       log.Fatalf("Failed to perform decryption operation using '%s': %v\n", keyInfo.KeyID, keyInfo.DecryptionErr)
    }

License

This SDK is distributed under the Apache License, Version 2.0, see LICENSE.

GitHub

https://github.com/minio/madmin-go