英文:
Find longest common suffix in Terraform?
问题
在Terraform中，您可以使用以下方式来找到这些字符串的最长公共后缀：
locals {
dns_names = [
"b-1.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com",
"b-2.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com",
"b-3.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com",
]
}
data "external" "find_common_suffix" {
program = ["bash", "-c", "echo '${join(",", local.dns_names)}' | rev | awk -F, '{print $1}' | rev"]
}
output "longest_common_suffix" {
value = data.external.find_common_suffix.result
}
这个Terraform配置将给出这些DNS名称的最长公共后缀，并将其存储在longest_common_suffix输出中。
英文:
I have a string of DNS names seperated by , like this:
b-1.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com,b-2.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com,b-3.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com
I want to find the longest common suffix of these strings, which in this case is .cluster.abcdef.c2.kafka.us-east-1.amazonaws.com
How can I achieve this in Terraform?
答案1
得分: 1
这是一个简单的示例，如果您使用适当的编程语言：
# util.py
import os.path as p
import sys
import json
r_dns_names = sys.argv[1][::-1]
r_split_dns_names = r_dns_names.split(",")
print(json.dumps({"output": p.commonprefix(r_split_dns_names)[::-1]}))
locals {
s = "b-1.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com,b-2.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com,b-3.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com"
}
data "external" "util" {
program = ["python3","util.py","${local.s}"]
}
output "dns" {
value = data.external.util.result.output
}
$ terraform apply -auto-approve
...
Outputs:
dns = ".cluster.abcdef.c2.kafka.us-east-1.amazonaws.com"
英文:
This is simple if you use a proper programming language:
# util.py
import os.path as p
import sys
import json
r_dns_names = sys.argv[1][::-1]
r_split_dns_names = r_dns_names.split(",")
print(json.dumps({"output": p.commonprefix(r_split_dns_names)[::-1]}))
locals {
s = "b-1.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com,b-2.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com,b-3.cluster.abcdef.c2.kafka.us-east-1.amazonaws.com"
}
data "external" "util" {
program = ["python3","util.py","${local.s}"]
}
output "dns" {
value = data.external.util.result.output
}
$ terraform apply -auto-approve
...
Outputs:
dns = ".cluster.abcdef.c2.kafka.us-east-1.amazonaws.com"
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