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Attach EBS volumes to etcd nodes for persistence #98

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Attach EBS volumes to etcd nodes for persistence #98

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adaa14e
Attach EBS volumes to etcd nodes for persistence
adambom Oct 24, 2016
c217df1
Add snapshotting module
adambom Oct 24, 2016
654a949
Remove unneeded vars
adambom Oct 24, 2016
0653e76
Add info about ebs volumes to readme
adambom Oct 24, 2016
8e73f42
Mount /dev/xvdf in cloud-config for etcd
adambom Oct 25, 2016
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33 changes: 32 additions & 1 deletion modules/etcd/ec2.tf
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Original file line number Diff line number Diff line change
@@ -1,3 +1,30 @@
resource "aws_ebs_volume" "etcd" {
count = "${ length( split(",", var.azs) ) }"

availability_zone = "${ element( split(",", var.azs), 0 ) }"

type = "gp2"
size = 100

tags {
builtWith = "terraform"
Cluster = "${ var.name }"
depends-id = "${ var.depends-id }"
KubernetesCluster = "${ var.name }"
Name = "etcd${ count.index + 1 }-${ var.name }"
role = "etcd,apiserver"
version = "${ var.coreos-hyperkube-tag }"
}
}

resource "aws_volume_attachment" "etcd" {
count = "${ length( split(",", var.azs) ) }"

device_name = "/dev/xvdf"
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@wellsie wellsie Oct 25, 2016 •
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@adambom - Where are you mounting xvdf ? Or am I missing something ?

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I forgot to include some changes to cloud-config.tf. On startup we format /dev/xvdf and mount it to /media/etcd2 and instruct etcd to use that location to persist state. I chose xvdf because that's the device we're using on worker nodes for ephemeral storage. See 8e73f42.

volume_id = "${ element(aws_ebs_volume.etcd.*.id, count.index) }"
instance_id = "${ element(aws_instance.etcd.*.id, count.index) }"
}

resource "aws_instance" "etcd" {
count = "${ length( split(",", var.etcd-ips) ) }"

Expand Down Expand Up @@ -32,5 +59,9 @@ resource "aws_instance" "etcd" {
}

resource "null_resource" "dummy_dependency" {
depends_on = [ "aws_instance.etcd" ]
depends_on = [
"aws_instance.etcd",
"aws_ebs_volume.etcd",
"aws_volume_attachment.etcd"
]
}