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OpenFaaSでmydns.jpのIPアドレス更新を行うfunctionを作成する

Last updated at Posted at 2022-01-10

前提

OpenFaaS環境の構築は終わっているものとする

faas-cliでfunctionイメージの雛形を作成する

faas-cli template pull
faas-cli new mydns-update --lang dockerfile

Folder: mydns-update created.
  ___                   _____           ____
 / _ \ _ __   ___ _ __ |  ___|_ _  __ _/ ___|
| | | | '_ \ / _ \ '_ \| |_ / _` |/ _` \___ \
| |_| | |_) |  __/ | | |  _| (_| | (_| |___) |
 \___/| .__/ \___|_| |_|_|  \__,_|\__,_|____/
      |_|


Function created in folder: mydns-update
Stack file written: mydns-update.yml

認証情報用Secret作成

公式ではfaas-cli経由で作成とあるが、gatewayやloginを指定する必要があり煩雑なためkubectlを使用して作成

kubectl create secret generic mydns-username --from-literal mydns-username="(username)" -n openfaas-fn
kubectl create secret generic mydns-password --from-literal mydns-password="(password)" -n openfaas-fn

コマンド作成

実行するdocker imageはalpineなのでbashはないので、ashを指定する。

/mydns-update/start.sh
#!/bin/ash

USER=`cat /var/openfaas/secrets/mydns-username`
PASS=`cat /var/openfaas/secrets/mydns-password`

wget -O- "http://$USER:$PASS@www.mydns.jp/login.html"

Dockerfile編集

mydns-update/Dockerfile
FROM ghcr.io/openfaas/classic-watchdog:0.2.0 as watchdog

FROM alpine:3.12

RUN mkdir -p /home/app

COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
RUN chmod +x /usr/bin/fwatchdog

+ ADD start.sh /home/app/start.sh
+ RUN chmod +x /home/app/start.sh

# Add non root user
RUN addgroup -S app && adduser app -S -G app
RUN chown -R app /home/app

WORKDIR /home/app

USER app

# Populate example here - i.e. "cat", "sha512sum" or "node index.js"
- ENV fprocess="cat"
+ ENV fprocess="/home/app/start.sh"
# Set to true to see request in function logs
ENV write_debug="false"

EXPOSE 8080

HEALTHCHECK --interval=3s CMD [ -e /tmp/.lock ] || exit 1

CMD ["fwatchdog"]

イメージ作成&push

faas-cli build -f mydns-update.yml
docker login
docker tag mydns-update username/mydns-update
docker push username/mydns-update

function定義

image.png

実行結果

INVOKEボタンを押して実行

Connecting to www.mydns.jp (81.4.101.244:80)
writing to stdout
<html>
<head>
<title>Free Dynamic DNS (DDNS) for Home Server and VPS etc  | MyDNS.JP</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<LINK href="./site.css" rel=stylesheet type=text/css>

</head>
<BODY BGCOLOR="#FFFFFF"
      TEXT="#304040"
      leftmargin="0" topmargin="0" marginwidth="0" marginheight="0"
>
Login and IP address notify OK.<BR>
login_status = 1.<BR>
<BR>
<DT>MASTERID :</DT><DD>mydns??????</DD>
<DT>REMOTE ADDRESS:</DT><DD>xxx.102.yyy.zzz</DD>
<DT>ACCESS DAYTIME:</DT><DD>2022/01/10 13:50:44 UTC</DD>
<DT>SERVER ADDRESS:</DT><DD>81.4.101.244</DD>
<BR>

</body>
</html>
-                    100% |********************************|   618  0:00:00 ETA
written to stdout

感想

Secret作成・参照するのではなく、実行時に与えるべき

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