How to get the instance id from within an ec2 instance

Question

How can I find out the instance id of an ec2 instance from within the ec2 instance

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Alternative approach for PHP    instance   json decode file get contents  http   169 254 169 254 latest dynamic instance-identity document   true    id    instance  instanceId    print r  instance     That will provide a lot of data about the instance  all nicely packed in an array  no external dependencies  As it s a request that never failed or delayed for me it should be safe to do it that way  otherwise I d go for curl

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For a Windows instance    wget http   169 254 169 254 latest meta-data instance-id  Content   or   ConvertFrom-Json  wget http   169 254 169 254 latest dynamic instance-identity document  Content  instanceId

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For all ec2 machines  the instance-id can be found in file        var lib cloud data instance-id   You can also get instance id by running the following command       ec2metadata --instance-id

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For PHP    instance   json decode file get contents  http   169 254 169 254 latest dynamic instance-identity document     id    instance  instanceId      Edit per  John

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A c   net class I wrote for EC2 metadata from the http api  I will build it up with functionality as needed  You can run with it if you like it   using Amazon  using System Net   namespace AT AWS       public static class HttpMetaDataAPI               public static bool TryGetPublicIP out string publicIP                        return TryGetMetaData  public-ipv4   out publicIP                     public static bool TryGetPrivateIP out string privateIP                        return TryGetMetaData  local-ipv4   out privateIP                     public static bool TryGetAvailabilityZone out string availabilityZone                        return TryGetMetaData  placement availability-zone   out availabilityZone                           lt summary gt              Gets the url of a given AWS service  according to the name of the required service and the AWS Region that this machine is in              lt  summary gt               lt param name  serviceName  gt The service we are seeking  such as ec2  rds etc  lt  param gt               lt remarks gt Each AWS service has a different endpoint url for each region lt  remarks gt               lt returns gt True if the operation was succesful  otherwise false lt  returns gt          public static bool TryGetServiceEndpointUrl string serviceName  out string serviceEndpointStringUrl                           start by figuring out what region this instance is in              RegionEndpoint endpoint              if  TryGetRegionEndpoint out endpoint                                    now that we know the region  we can get details about the requested service in that region                 var details   endpoint GetEndpointForService serviceName                   serviceEndpointStringUrl    details HTTPS    https        http        details Hostname                  return true                               satisfy the compiler by assigning a value to serviceEndpointStringUrl             serviceEndpointStringUrl   null              return false                    public static bool TryGetRegionEndpoint out RegionEndpoint endpoint                           we can get figure out the region end point from the availability zone                that this instance is in  so we start by getting the availability zone              string availabilityZone              if  TryGetAvailabilityZone out availabilityZone                                    name of the availability zone is  lt nameOfRegionEndpoint gt  a b c etc                     so just take the name of the availability zone and chop off the last letter                 var nameOfRegionEndpoint   availabilityZone Substring 0  availabilityZone Length - 1                   endpoint   RegionEndpoint GetBySystemName nameOfRegionEndpoint                   return true                               satisfy the compiler by assigning a value to endpoint             endpoint   RegionEndpoint USWest2              return false                         lt summary gt              Downloads instance metadata              lt  summary gt               lt returns gt True if the operation was successful  false otherwise lt  returns gt               lt remarks gt The operation will be unsuccessful if the machine running this code is not an AWS EC2 machine  lt  remarks gt          static bool TryGetMetaData string name  out string result                        result   null              try   result   new WebClient   DownloadString  http   169 254 169 254 latest meta-data     name   return true                catch   return false                                                                                MetaData keys       Use these keys to write more functions as you need them                                                               ami-id ami-launch-index ami-manifest-path block-device-mapping  hostname instance-action instance-id instance-type local-hostname local-ipv4 mac metrics  network  placement  profile public-hostname public-ipv4 public-keys  reservation-id security-groups

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On Ubuntu you can   sudo apt-get install cloud-utils   And then you can   EC2 INSTANCE ID   ec2metadata --instance-id    You can get most of the metadata associated with the instance this way    ec2metadata --help Syntax   usr bin ec2metadata  options   Query and display EC2 metadata   If no options are provided  all options will be displayed  Options      -h --help               show this help      --kernel-id             display the kernel id     --ramdisk-id            display the ramdisk id     --reservation-id        display the reservation id      --ami-id                display the ami id     --ami-launch-index      display the ami launch index     --ami-manifest-path     display the ami manifest path     --ancestor-ami-ids      display the ami ancestor id     --product-codes         display the ami associated product codes     --availability-zone     display the ami placement zone      --instance-id           display the instance id     --instance-type         display the instance type      --local-hostname        display the local hostname     --public-hostname       display the public hostname      --local-ipv4            display the local ipv4 ip address     --public-ipv4           display the public ipv4 ip address      --block-device-mapping  display the block device id     --security-groups       display the security groups      --mac                   display the instance mac address     --profile               display the instance profile     --instance-action       display the instance-action      --public-keys           display the openssh public keys     --user-data             display the user data  not actually metadata

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In the question you have mentioned the user as root  one thing I should mention is that the instance ID is not dependent on the user    For Node developers   var meta    new AWS MetadataService     meta request   latest meta-data instance-id   function err  data       console log data

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Use the  dynamic instance-identity document URL if you also need to query more than just your instance ID   wget -q -O - http   169 254 169 254 latest dynamic instance-identity document  This will get you JSON data such as this - with only a single request          devpayProductCodes    null       privateIp     10 1 2 3        region     us-east-1        kernelId     aki-12345678        ramdiskId    null       availabilityZone     us-east-1a        accountId     123456789abc        version     2010-08-31        instanceId     i-12345678        billingProducts    null       architecture     x86 64        imageId     ami-12345678        pendingTime     2014-01-23T45 01 23Z        instanceType     m1 small

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For Ruby   require  rubygems  require  aws-sdk  require  net http   metadata endpoint    http   169 254 169 254 latest meta-data   instance id   Net  HTTP get  URI parse  metadata endpoint    instance-id       ec2   AWS  EC2 new   instance   ec2 instances instance id

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For powershell people    New-Object System Net WebClient  DownloadString  http   169 254 169 254 latest meta-data instance-id

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On Amazon Linux AMIs you can do     ec2-metadata -i instance-id  i-1234567890abcdef0   Or  on Ubuntu and some other linux flavours  ec2metadata --instance-id  This command may not be installed by default on ubuntu  but you can add it with sudo apt-get install cloud-utils   As its name suggests  you can use the command to get other useful metadata too

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To get the instance metadata use  wget -q -O - http   169 254 169 254 latest meta-data instance-id

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See this post - note that the IP address in the URL given is constant  which confused me at first   but the data returned is specific to your instance

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Run this   curl http   169 254 169 254 latest meta-data    You will be able to see different types of attributes which are provided by aws   Use this link to view more

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Motivation  User would like to Retrieve aws instance metadata  Solution  The IP address 169 254 169 254 is a link-local address  and is valid only from the instance  aws gives us link with dedicated Restful API for Retrieving metadata of our running instance  Note that you are not billed for HTTP requests used to retrieve instance metadata and user data    for Additional Documentation Example    Request  curl http   169 254 169 254 latest meta-data instance-id    Response ami-123abc  You able to get additional metadata labels of your instance using this link http   169 254 169 254 latest meta-data  lt metadata-field gt  just choose the right tags   ami-id ami-launch-index ami-manifest-path block-device mapping events hibernation hostname iam identity-credentials instance-action instance-id instance-type local-hostname local-ipv4 mac metrics network placement profile reservation-id security-groups services

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on AWS Linux    ec2-metadata --instance-id   cut -d     -f 2  Output   i-33400429  Using in variables   ec2InstanceId   ec2-metadata --instance-id   cut -d     -f 2   ls  log   ec2InstanceId

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The latest Java SDK has EC2MetadataUtils   In Java   import com amazonaws util EC2MetadataUtils  String myId   EC2MetadataUtils getInstanceId      In Scala   import com amazonaws util EC2MetadataUtils val myid   EC2MetadataUtils getInstanceId

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For Python   import boto utils region boto utils get instance metadata    local-hostname   split      1    which boils down to the one-liner   python -c  import boto utils  print boto utils get instance metadata    local-hostname   split      1     Instead of local hostname you could also use public hostname  or   boto utils get instance metadata    placement    availability-zone    -1

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FWIW I wrote a FUSE filesystem to provide access to the EC2 metadata service  https   bitbucket org dgc ec2mdfs   I run this on all custom AMIs  it allows me to use this idiom  cat  ec2 meta-data ami-id

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For C    using cURL         include  lt curl curl h gt            cURL to string     size t curl to str void  contents  size t size  size t nmemb  void  userp              std  string  userp - gt append  char  contents  size   nmemb           return size   nmemb                   Read Instance-id      curl global init CURL GLOBAL ALL      Initialize cURL     CURL  curl     cURL handler     CURLcode res code     Result     string response      curl   curl easy init       Initialize handler     curl easy setopt curl  CURLOPT URL   http   169 254 169 254 latest meta-data instance-id        curl easy setopt curl  CURLOPT WRITEFUNCTION  curl to str       curl easy setopt curl  CURLOPT WRITEDATA   amp response       res code   curl easy perform curl      Perform cURL     if  res code    CURLE OK          Error     curl easy cleanup curl      Cleanup handler     curl global cleanup       Cleanup cURL

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You can just make a HTTP request to GET any Metadata by passing the your metadata parameters   curl http   169 254 169 254 latest meta-data instance-id   or   wget -q -O - http   169 254 169 254 latest meta-data instance-id   You won t be billed for HTTP requests to get Metadata and Userdata   Else  You can use EC2 Instance Metadata Query Tool which is a  simple bash script that uses curl to query the EC2 instance Metadata from within a running EC2 instance as mentioned in documentation   Download the tool     wget http   s3 amazonaws com ec2metadata ec2-metadata   now run command to get required data    ec2metadata -i   Refer   http   docs aws amazon com AWSEC2 latest UserGuide ec2-instance-metadata html  https   aws amazon com items 1825 externalID 1825  Happy To Help

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A more contemporary solution   From Amazon Linux the ec2-metadata command is already installed   From the terminal  ec2-metadata -help   Will give you the available options  ec2-metadata -i   will return  instance-id  yourid

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In Go you can use the goamz package   import        github com mitchellh goamz aws       log     func getId    id string        idBytes  err    aws GetMetaData  instance-id       if err    nil           log Fatalf  Error getting instance-id   v    err             id   string idBytes       return id     Here s the GetMetaData source

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If you wish to get the all instances id list in python here is the code   import boto3  ec2 boto3 client  ec2   instance information   ec2 describe instances    for reservation in instance information  Reservations       for instance in reservation  Instances          print instance  InstanceId

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Simply check the var lib cloud instance symlink  it should point to  var lib cloud instances  instance-id  where  instance id  is your instance-id

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Just Type   ec2metadata --instance-id

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For  NET People     string instanceId   new StreamReader        HttpWebRequest Create  http   169 254 169 254 latest meta-data instance-id          GetResponse   GetResponseStream         ReadToEnd

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You can also install awscli and use it to get all the info you wish   AWS DEFAULT REGION your-region aws ec2 describe-instances   You ll get lots of output so be sure to grep by your idetifier such as ip and print some more lines   AWS DEFAULT REGION your-region aws ec2 describe-instances   grep your-ip -A 10   grep InstanceId

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You can try this      bin bash aws instance   wget -q -O- http   169 254 169 254 latest meta-data instance-id  aws region   wget -q -O- http   169 254 169 254 latest meta-data hostname  aws region   aws region     aws region   aws region      aws zone  ec2-describe-instances  aws instance --region  aws region  aws zone  expr match   aws zone        aws region a-z

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See the EC2 documentation on the subject  Run  wget -q -O - http   169 254 169 254 latest meta-data instance-id  If you need programmatic access to the instance ID from within a script  die     status  1  shift  echo  quot FATAL     quot   exit  status    EC2 INSTANCE ID  quot  wget -q -O - http   169 254 169 254 latest meta-data instance-id    die   quot wget instance-id has failed      quot   quot   Here is an example of a more advanced use  retrieve instance ID as well as availability zone and region  etc    EC2 INSTANCE ID  quot  wget -q -O - http   169 254 169 254 latest meta-data instance-id    die   quot wget instance-id has failed      quot   quot  test -n  quot  EC2 INSTANCE ID quot     die  cannot obtain instance-id  EC2 AVAIL ZONE  quot  wget -q -O - http   169 254 169 254 latest meta-data placement availability-zone    die   quot wget availability-zone has failed      quot   quot  test -n  quot  EC2 AVAIL ZONE quot     die  cannot obtain availability-zone  EC2 REGION  quot  echo   quot  EC2 AVAIL ZONE  quot    sed -e  s    0-9  0-9     a-z       1    quot   You may also use curl instead of wget  depending on what is installed on your platform

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All meta-data related to EC2 resource can be accessed by the EC2 instance itself with the help of the following command being executed   CURL    http   169 254 169 254  lt api-version gt  meta-data  lt metadata-requested gt    For your case   metadata-requested  should be instance-id    api-version  is usually latest that can be used   Additional Note  You can also get information related to below EC2 attributes using the above command   ami-id  ami-launch-index  ami-manifest-path  block-device-mapping   hostname  iam   instance-action  instance-id  instance-type  local-hostname  local-ipv4  mac  metrics   network   placement   profile  public-hostname  public-ipv4  public-keys   reservation-id  security-groups  services    For more details please follow this link   https   docs aws amazon com AWSEC2 latest UserGuide ec2-instance-metadata html

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For AWS elastic beanstalk eb cli run eb tags --list

[amazon-ec2] How to get the instance id from within an ec2 instance?

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