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当尝试从我的 configMap 文件中的 env 变量中导出一个值 (CONSUL_DNS_SERVICE_HOST) 时，我收到一个错误 - PSB

# From my container:
> printenv CONSUL_DNS_SERVICE_HOST 
10.100.180.151

> kubectl -n kube-system get configmap coredns -o yaml 
apiVersion: v1
data:
  Corefile: |
    .:53 {
        errors
        log
        health
        kubernetes cluster.local 10.0.0.0/24
        rewrite name . .default.svc.cluster.local
        prometheus :9153
        proxy . /etc/resolv.conf
        cache 30
        reload
    }
    consul:53 {
        log
        errors
        cache 30
        proxy . "$(printenv CONSUL_DNS_SERVICE_HOST)"

> kubectl logs --tail=20 -f coredns-7bcbfc4774-4n9p7 -n kube-system
2019/01/10 11:15:59 plugin/proxy: not an IP address or file: "$(printenv CONSUL_DNS_SERVICE_HOST)"
我找不到办法检索 CONSUL_DNS_SERVICE_HOST 的 IP

谢谢

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