minio/pkg/madmin

Golang Admin Client API Reference

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/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.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	Top operations	IAM operations	Misc	KMS
ServiceRestart	ServerInfo	Heal	GetConfig	TopLocks	AddUser		GetKeyStatus
ServiceStop	ServerCPULoadInfo		SetConfig		SetUserPolicy	StartProfiling
	ServerMemUsageInfo				ListUsers	DownloadProfilingData
ServiceTrace	ServerDrivesPerfInfo				AddCannedPolicy	ServerUpdate
	NetPerfInfo
	ServerCPUHardwareInfo
	ServerNetworkHardwareInfo
	StorageInfo

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.Uptime	time.Duration	Server uptime duration in seconds.

Example

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

ServiceRestart() error

Sends a service action restart command to MinIO server.

Example

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

ServiceStop() error

Sends a service action stop command to MinIO server.

Example

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

ServiceTrace(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(allTrace, doneCh)
    for traceInfo := range traceCh {
        fmt.Println(traceInfo.String())
    }

3. Info operations

ServerInfo() ([]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()
   if err != nil {
   	log.Fatalln(err)
   }

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

ServerDrivesPerfInfo() ([]ServerDrivesPerfInfo, error)

Fetches drive performance information for all cluster nodes.

Param	Type	Description
di.Addr	string	Address of the server the following information is retrieved from.
di.Error	string	Errors (if any) encountered while reaching this node
di.DrivesPerf	disk.Performance	Path of the drive mount on above server and read, write speed.

Param	Type	Description
disk.Performance.Path	string	Path of drive mount.
disk.Performance.Error	string	Error (if any) encountered while accessing this drive.
disk.Performance.WriteSpeed	float64	Write speed on above path in Bytes/s.
disk.Performance.ReadSpeed	float64	Read speed on above path in Bytes/s.

ServerCPULoadInfo() ([]ServerCPULoadInfo, error)

Fetches CPU utilization for all cluster nodes.

Param	Type	Description
cpui.Addr	string	Address of the server the following information is retrieved from.
cpui.Error	string	Errors (if any) encountered while reaching this node
cpui.CPULoad	cpu.Load	The load on the CPU.

Param	Type	Description
cpu.Load.Avg	float64	The average utilization of the CPU measured in a 200ms interval
cpu.Load.Min	float64	The minimum utilization of the CPU measured in a 200ms interval
cpu.Load.Max	float64	The maximum utilization of the CPU measured in a 200ms interval
cpu.Load.Error	string	Error (if any) encountered while accessing the CPU info

ServerMemUsageInfo() ([]ServerMemUsageInfo, error)

Fetches Mem utilization for all cluster nodes.

Param	Type	Description
memi.Addr	string	Address of the server the following information is retrieved from.
memi.Error	string	Errors (if any) encountered while reaching this node
memi.MemUsage	mem.Usage	The utilitzation of Memory

Param	Type	Description
mem.Usage.Mem	uint64	The total number of bytes obtained from the OS
mem.Usage.Error	string	Error (if any) encountered while accessing the CPU info

NetPerfInfo(int size) (map[string][]NetPerfInfo, error)

Fetches network performance of all cluster nodes using given sized payload. Returned value is a map containing each node indexed list of performance of other nodes.

Param	Type	Description
Addr	string	Address of the server the following information is retrieved from.
Error	string	Errors (if any) encountered while reaching this node
ReadThroughput	uint64	Network read throughput of the server in bytes per second

ServerCPUHardwareInfo() ([]ServerCPUHardwareInfo, error)

Fetches hardware information of CPU.

Param	Type	Description
hwi.Addr	string	Address of the server the following information is retrieved from.
hwi.Error	string	Errors (if any) encountered while reaching this node
hwi.CPUInfo	[]cpu.InfoStat	The CPU hardware info.

Param	Type	Description
CPUInfo.CPU	int32	CPU
CPUInfo.VendorID	string	Vendor Id
CPUInfo.Family	string	CPU Family
CPUInfo.Model	string	Model
CPUInfo.Stepping	int32	Stepping
CPUInfo.PhysicalId	string	Physical Id
CPUInfo.CoreId	string	Core Id
CPUInfo.Cores	int32	Cores
CPUInfo.ModelName	string	Model Name
CPUInfo.Mhz	float64	Mhz
CPUInfo.CacheZSize	int32	cache sizes
CPUInfo.Flags	[]string	Flags
CPUInfo.Microcode	string	Micro codes

ServerNetworkHardwareInfo() ([]ServerNetworkHardwareInfo, error)

Fetches hardware information of CPU.

Param	Type	Description
hwi.Addr	string	Address of the server the following information is retrieved from.
hwi.Error	string	Errors (if any) encountered while reaching this node
hwi.NetworkInfo	[]net.Interface	The network hardware info

Param	Type	Description
NetworkInfo.Index	int32	positive integer that starts at one, zero is never used.
NetworkInfo.MTU	int32	maximum transmission unit
NetworkInfo.Name	string	e.g., "en0", "lo0", "eth0.100"
NetworkInfo.HardwareAddr	[]byte	IEEE MAC-48, EUI-48 and EUI-64 form
NetworkInfo.Flags	uint32	e.g., FlagUp, FlagLoopback, FlagMulticast

StorageInfo() (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.StandardSCData	int	Data disks set for standard storage class, is empty for FS.
Backend.StandardSCParity	int	Parity disks set for standard storage class, is empty for FS.
Backend.RRSCData	int	Data disks set for reduced redundancy 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()
   if err != nil {
   	log.Fatalln(err)
   }

   log.Println(storageInfo)

5. Heal operations

Heal(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("", "", 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

6. Config operations

GetConfig() ([]byte, error)

Get current config.json of a MinIO server.

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()))

SetConfig(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(config); err != nil {
        log.Fatalf("failed due to: %v", err)
    }
    log.Println("SetConfig was successful")

7. Top operations

TopLocks() (LockEntries, error)

Get the oldest locks from MinIO server.

Example

    locks, err := madmClnt.TopLocks()
    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(policyName string, policy string) error

Create a new canned policy on MinIO server.

Example

	policy := `{"Version": "2012-10-17","Statement": [{"Action": ["s3:GetObject"],"Effect": "Allow","Resource": ["arn:aws:s3:::my-bucketname/*"],"Sid": ""}]}`

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

AddUser(user string, secret string) error

Add a new user on a MinIO server.

Example

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

SetUserPolicy(user string, policyName string) error

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

Example

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

ListUsers() (map[string]UserInfo, error)

Lists all users on MinIO server.

Example

	users, err := madmClnt.ListUsers();
    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(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(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(profiler string) error

Ask all nodes to start profiling using the specified profiler mode

Example

    startProfilingResults, err = madmClnt.StartProfiling("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() ([]byte, error)

Download profiling data of all nodes in a zip format.

Example

    profilingData, err := madmClnt.DownloadProfilingData()
    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(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("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)
    }