In terraform, is it possible to only add an optional resource argument if a particular variable is set











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On my concrete example:



I want to create a rancher environment resource with preconfigured members. But the number of members is supposed to be depending on a variable list. I'd imaging something like



resource "rancher_environment" "renv" {
name = "renv"
project_template_id = "atmplid"

member {
count = "${length(var.memberlist)}"
external_id = "${var.memberlist[count.index]}"
external_id_type = "exttype"
role = "owner"
}
}


This obviously doesn't work. Is there a trick to achieve this behaviour?










share|improve this question




























    up vote
    1
    down vote

    favorite












    On my concrete example:



    I want to create a rancher environment resource with preconfigured members. But the number of members is supposed to be depending on a variable list. I'd imaging something like



    resource "rancher_environment" "renv" {
    name = "renv"
    project_template_id = "atmplid"

    member {
    count = "${length(var.memberlist)}"
    external_id = "${var.memberlist[count.index]}"
    external_id_type = "exttype"
    role = "owner"
    }
    }


    This obviously doesn't work. Is there a trick to achieve this behaviour?










    share|improve this question


























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      On my concrete example:



      I want to create a rancher environment resource with preconfigured members. But the number of members is supposed to be depending on a variable list. I'd imaging something like



      resource "rancher_environment" "renv" {
      name = "renv"
      project_template_id = "atmplid"

      member {
      count = "${length(var.memberlist)}"
      external_id = "${var.memberlist[count.index]}"
      external_id_type = "exttype"
      role = "owner"
      }
      }


      This obviously doesn't work. Is there a trick to achieve this behaviour?










      share|improve this question















      On my concrete example:



      I want to create a rancher environment resource with preconfigured members. But the number of members is supposed to be depending on a variable list. I'd imaging something like



      resource "rancher_environment" "renv" {
      name = "renv"
      project_template_id = "atmplid"

      member {
      count = "${length(var.memberlist)}"
      external_id = "${var.memberlist[count.index]}"
      external_id_type = "exttype"
      role = "owner"
      }
      }


      This obviously doesn't work. Is there a trick to achieve this behaviour?







      terraform rancher






      share|improve this question















      share|improve this question













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      share|improve this question








      edited Nov 22 at 12:54









      Vít Kotačka

      465420




      465420










      asked Nov 21 at 23:50









      LeoR

      480416




      480416
























          2 Answers
          2






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          up vote
          2
          down vote













          You can use null_resource for this. Try this



          resource "null_resource" "memberlist" {
          count = "${length(var.memberlist)}"
          triggers {
          external_id = "${var.memberlist[count.index]}"
          external_id_type = "exttype"
          role = "owner"
          }
          }

          resource "rancher_environment" "renv" {
          name = "renv"
          project_template_id = "atmplid"

          member = ["${null_resource.memberlist.*.triggers}"]
          }





          share|improve this answer




























            up vote
            1
            down vote













            At long last, Terraform has just released v0.12.0-alpha1, which contains a more elegant way of solving this exact problem.






            share|improve this answer





















              Your Answer






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              2 Answers
              2






              active

              oldest

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              2 Answers
              2






              active

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              up vote
              2
              down vote













              You can use null_resource for this. Try this



              resource "null_resource" "memberlist" {
              count = "${length(var.memberlist)}"
              triggers {
              external_id = "${var.memberlist[count.index]}"
              external_id_type = "exttype"
              role = "owner"
              }
              }

              resource "rancher_environment" "renv" {
              name = "renv"
              project_template_id = "atmplid"

              member = ["${null_resource.memberlist.*.triggers}"]
              }





              share|improve this answer

























                up vote
                2
                down vote













                You can use null_resource for this. Try this



                resource "null_resource" "memberlist" {
                count = "${length(var.memberlist)}"
                triggers {
                external_id = "${var.memberlist[count.index]}"
                external_id_type = "exttype"
                role = "owner"
                }
                }

                resource "rancher_environment" "renv" {
                name = "renv"
                project_template_id = "atmplid"

                member = ["${null_resource.memberlist.*.triggers}"]
                }





                share|improve this answer























                  up vote
                  2
                  down vote










                  up vote
                  2
                  down vote









                  You can use null_resource for this. Try this



                  resource "null_resource" "memberlist" {
                  count = "${length(var.memberlist)}"
                  triggers {
                  external_id = "${var.memberlist[count.index]}"
                  external_id_type = "exttype"
                  role = "owner"
                  }
                  }

                  resource "rancher_environment" "renv" {
                  name = "renv"
                  project_template_id = "atmplid"

                  member = ["${null_resource.memberlist.*.triggers}"]
                  }





                  share|improve this answer












                  You can use null_resource for this. Try this



                  resource "null_resource" "memberlist" {
                  count = "${length(var.memberlist)}"
                  triggers {
                  external_id = "${var.memberlist[count.index]}"
                  external_id_type = "exttype"
                  role = "owner"
                  }
                  }

                  resource "rancher_environment" "renv" {
                  name = "renv"
                  project_template_id = "atmplid"

                  member = ["${null_resource.memberlist.*.triggers}"]
                  }






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 22 at 8:46









                  Ram

                  385112




                  385112
























                      up vote
                      1
                      down vote













                      At long last, Terraform has just released v0.12.0-alpha1, which contains a more elegant way of solving this exact problem.






                      share|improve this answer

























                        up vote
                        1
                        down vote













                        At long last, Terraform has just released v0.12.0-alpha1, which contains a more elegant way of solving this exact problem.






                        share|improve this answer























                          up vote
                          1
                          down vote










                          up vote
                          1
                          down vote









                          At long last, Terraform has just released v0.12.0-alpha1, which contains a more elegant way of solving this exact problem.






                          share|improve this answer












                          At long last, Terraform has just released v0.12.0-alpha1, which contains a more elegant way of solving this exact problem.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered Dec 3 at 16:05









                          Tiemen

                          24116




                          24116






























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