How to edit the "cluster-env.xml" entries using Ambari Rest APIs

[#1]

Step1). Get all the properties from the below command: (Here : "http://jss1:8080" is the URL where ambari server is running)

curl --user admin:admin -i -H 'X-Requested-By: ambari' -X GET http://jss1:8080/api/v1/clusters/JoyCluster/configurations?type=cluster-env\&tag=version1

Step2). Save the output from above command to a file. Or just open the URL in browser and save it to a file:

http://jss1:8080/api/v1/clusters/JoyCluster/configurations?type=cluster-env&tag=version1

.

For example here i got the following output from the above URL:

{
  "href" : "http://jss1:8080/api/v1/clusters/JoyCluster/configurations?type=cluster-env&tag=version1",
  "items" : [
    {
      "href" : "http://jss1:8080/api/v1/clusters/JoyCluster/configurations?type=cluster-env&tag=version1",
      "tag" : "version1",
      "type" : "cluster-env",
      "version" : 1,
      "Config" : {
        "cluster_name" : "JoyCluster",
        "stack_id" : "HDP-2.4"
      },
      "properties" : {
        "fetch_nonlocal_groups" : "true",
        "ignore_groupsusers_create" : "false",
        "kerberos_domain" : "EXAMPLE.COM",
        "managed_hdfs_resource_property_names" : "",
        "override_uid" : "true",
        "repo_suse_rhel_template" : "[{{repo_id}}]\nname={{repo_id}}\n{% if mirror_list %}mirrorlist={{mirror_list}}{% else %}baseurl={{base_url}}{% endif %}\n\npath=/\nenabled=1\ngpgcheck=0",
        "repo_ubuntu_template" : "{{package_type}} {{base_url}} {{components}}",
        "security_enabled" : "false",
        "smokeuser" : "ambari-qa",
        "smokeuser_keytab" : "/etc/security/keytabs/smokeuser.headless.keytab",
        "user_group" : "hadoop"
      }
    }
  ]
}

Here notice that the value of ["ignore_groupsusers_create" : "false"] That we are going to change to "true"

Step3). Create a fresh file with any name (like: /tmp/configurations.txt) with the following content:

{ 
  "Clusters" : {
    "desired_configs" : { 
      "type" : "cluster-env", 
      "tag" : "version2", 
      "properties" : {
         // *** WE WILL NEED TO ADD OUR PROPERTIES HERE FROM THE OUTPUT OF STEP2 OUTPUT *** //
       }
    }
  }
}

Step4). Now for example we edited the file "/tmp/configurations.txt" like following (notice: "ignore_groupsusers_create" : "true"):

{ 
  "Clusters" : {
    "desired_configs" : { 
      "type" : "cluster-env", 
      "tag" : "version2", 
      "properties" : { 
        "fetch_nonlocal_groups" : "true",
        "ignore_groupsusers_create" : "true",
        "kerberos_domain" : "EXAMPLE.COM",
        "managed_hdfs_resource_property_names" : "",
        "override_uid" : "true",
        "repo_suse_rhel_template" : "[{{repo_id}}]\nname={{repo_id}}\n{% if mirror_list %}mirrorlist={{mirror_list}}{% else %}baseurl={{base_url}}{% endif %}\n\npath=/\nenabled=1\ngpgcheck=0",
        "repo_ubuntu_template" : "{{package_type}} {{base_url}} {{components}}",
        "security_enabled" : "false",
        "smokeuser" : "ambari-qa",
        "smokeuser_keytab" : "/etc/security/keytabs/smokeuser.headless.keytab",
        "user_group" : "hadoop"      }
    }
  }
}

Step5). Now do a curl PUT on the URL: http://jss1:8080/api/v1/clusters/JoyCluster to push this change to ambari.

curl --user admin:admin -i -H 'X-Requested-By: ambari' -X PUT -d @/tmp/configurations.txt http://jss1:8080/api/v1/clusters/JoyCluster

Step6). Users can validate the changes by accessing the URL:

http://jss1:8080/api/v1/clusters/JoyCluster/configurations?type=cluster-env&tag=version2

.