This is probably better directed to the terraform list instead of the packer user list.
On Dec 11, 2017 16:32, "Hyeongseob Kim" <[email protected]> wrote: > Hi everyone! > > I'm using terraform for my project. > and I met critical problem with terraform. > > > First, I created redis using following terraform modules few monthes ago. > - aws_elasticache_parameter_group > - aws_elasticache_cluster > > > the redis has only master node. ( 0 shard , 1 node, no replica, cluster > mode not enabled ) > > > last week, I decided to make the redis master-replica for safe. > There are a lot of data in the redis. so, I must change the structure > without data lost. > I want to make the redis as following( 1 shard, 2 node, multi AZ automatic > fail over, cluster mode not enabled) > > > On the AWS console, I'm able to change the redis through following process. > - add replica > - add node ( different AZ with Master node ) > - enable Muti AZ > > Next, I tried to do same job using terraform but I met problems so, > couldn't > following are the ways that I tried > > > 1st. way > > As I found, following modules are used for master-replica redis. > - aws_elasticache_parameter_group > - aws_elasticache_replication_group > > > I used same aws_elasticache_parameter_group. > And use aws_elasticache_replication_group instead of > aws_elasticache_cluster. > then 'Terraform plan' says, existed redis will be deleted and new redis > will be created. > I think terraform recreate redis because existing redis and new redis > structure use different terraform moules. > I can't use this. > > > 2nd. way > Next, I decided to change the redis on aws and modify terraform.tfstate > manually. > I created a redis ( 0 shard , 1 node, no replica, cluster mode not enabled > ) for test. > and changed the redis structure to ( 1 shard, 2 node, multi AZ automatic > fail over, cluster mode not enabled) on the aws console > then 'terraform plan' > but it says nothing changed. > there are different points between terraform.tfstate and real aws > component because I changed it. > but Terraform cant' recongnized it. > > There are one more problem. > in spite of ablove problem, I tried to proceed this way. > and I found 'terraform import' doesn't support > 'aws_elasticache_replication_group' > so, I can't import the modified redis. > I gave up this way. > > > 3nd way > > In terraform document, I found that there is 'replication_group_id' in > aws_elasticache_cluster module > so, I tried to use all of 3 modules below > > - aws_elasticache_parameter_group > - aws_elasticache_cluster > - aws_elasticache_replication_group > > add replication_group_id in the aws_elasticache_cluster module and give > "aws_elasticache_replication_group.EXAMPLE.replication_group_id" as the > value > then 'terraform plan' > it says "Error: aws_elasticache_cluster.redis_petertest: > "replication_group_id": this field cannot be set" > also fail. > The parameter isn't able to use. I couldn't find the reason. > > > My questions are... > > 1. Is there any way to make existing redis ( 0 shard , 1 node, no replica, > cluster mode not enabled ) > to ( 1 shard, 2 node, multi AZ automatic fail over, cluster mode not > enabled) without data lost using terraform? > 2. Is 'replication_group_id' in 'aws_elasticache_cluster' module > available? I can't find the way. > 3. If there is a way for 2nd question, Could you give me the example > script to created redis using all of three modules below? > aws_elasticache_parameter_group, aws_elasticache_cluster and > aws_elasticache_replication_group. > > > If there is anyway to make redis master slave stucture without data lost, > please help me. > > -- > This mailing list is governed under the HashiCorp Community Guidelines - > https://www.hashicorp.com/community-guidelines.html. 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