【分享代码片段】terraform中，如何从刚刚创建的 deployment 中获得所有容器的名字和 ip
作者:张富春(ahfuzhang)，转载时请注明作者和引用链接，谢谢！
不好意思，刚刚才开始用 terraform，或许是更好的办法而我不知道。
知道的朋友请一定教教我。
下面是我的办法：
provider "kubernetes" {
config_path = "../k8s.yaml"
}
resource "kubernetes_deployment" "ahfu-test-deploy-1" {
metadata {
namespace = "test-devops"
name = "ahfu-test-deploy-1"
labels = {
test = "ahfu-test-deploy-1" # 这个标签用于过滤出 pod
}
}
spec {
replicas = 2
selector {
match_labels = {
test = "ahfu-test-deploy-1"
}
}
template {
metadata {
labels = {
test = "ahfu-test-deploy-1"
}
}
spec {
container {
image = "alpine:3.18.4"
image_pull_policy = "IfNotPresent"
command = ["/bin/sh"]
args = [
"/data/run.sh",
]
name = "ahfu-test-deploy-1"
resources {
limits = {
cpu = "0.5"
memory = "512Mi"
}
requests = {
cpu = "250m"
memory = "50Mi"
}
}
volume_mount {
name = "config-volume"
mount_path = "/data/"
}
env {
name = "CONTAINER_NAME"
value_from {
field_ref {
field_path = "metadata.name"
}
}
}
env {
name = "CONTAINER_IP"
value_from {
field_ref {
field_path = "status.podIP"
}
}
}
volume {
name = "config-volume"
config_map {
name = "ahfu-configmap-1" # 这里准备了一个 configMap，内容是一个 bash 文件
}
}
}
}
}
}
data "external" "filtered_pods" {
depends_on = [kubernetes_deployment.ahfu-test-deploy-1] # 等待前面的 deployment 创建成功
# 用一条命令来得到 k8s 上的 pod 的数据
# kubectl get pods -l test=ahfu-test-deploy-1 -n sige-test-devops -o json | jq -c '{"r": .|tojson }'
# 猜测 terraform 中使用 golang 的 map[string]string 来反序列化 json，所以 key-value 必须都是 string 类型
program = ["bash", "-c", "kubectl get pods -l test=ahfu-test-deploy-1 -n sige-test-devops -o json | jq -c '{\"r\": .|tojson }'"]
}
output "containers" {
# 使用 json decode 来获取 kubectl 返回的内容
value = [for item in jsondecode(data.external.filtered_pods.result.r).items : { container_name = item.metadata.name, container_ip = item.status.podIP }]
}
执行 terraform apply -auto-approve后，输出如下内容：
containers = [
{
"container_ip" = "10.42.0.175"
"container_name" = "ahfu-test-deploy-1-846cf445f7-npbp2"
},
{
"container_ip" = "10.42.1.96"
"container_name" = "ahfu-test-deploy-1-846cf445f7-m5kqr"
},
]