本次的練功內容要教大家如何將 Ktor 應用程式以 Shadow Plugin 編譯成 Fat Jar，並在 Linux 主機上建置一個可以運行 JVM、有 Nginx、加掛 SSL 的環境，讓 Ktor 應用程式可以實際部署後提供服務。

1. Ktor
Fat Jar
—
(shengyou)
Kotlin Ktor
2020/10/18

2. —
• Developer Advocate
• Backend Developer
• Open Source Community Organizer

3. —
• Ktor
• Ktor
• Fat Jar
•

4. —
/ /

5. —
/ /

6. /
—
Fat Jar
Container

7. /
—
Fat Jar
Container

8. Shadow Plugin
—
// gradle.properties
shadow_version=5.1.0
// build.gradle
buildscript {
// ...
dependencies {
classpath "...:shadow:$shadow_version"
}
}
// ...
apply plugin: 'com.github.johnrengelman.shadow'
// ...
shadowJar {
manifest {
attributes 'Main-Class': mainClassName
}
}

9. Build
—
$ ./gradlew shadowJar

10. Run artifact
—
$ cd build/libs/
$ export PORT=* && java -jar *.jar

11. Provision
—
1. JVM
2. Nginx

12. —
$ apt update
$ apt upgrade

13. —
$ apt install vim curl
wget git zip unzip
software-properties-common

14. SDK
—
$ curl -s "https://get.sdkman.io" | bash
$ source "/root/.sdkman/bin/sdkman-init.sh"
$ sdk install java 11.0.7.hs-adpt
$ sdk install gradle
$ sdk install kotlin
$ java --version
$ gradle --version

15. Nginx
—
$ apt-add-repository ppa:nginx/development -y
$ apt-get install -y --allow-downgrades
--allow-remove-essential
--allow-change-held-packages
nginx

16. Linux
—
1. App Linux
2.
3. SSL

17. Service
—
$ vim /etc/systemd/system/*.service

18. Serveice
—
[Unit]
Description=Ktor App
After=syslog.target
After=network.target[Service]
[Service]
ExecStart=/.../java -jar /.../*.jar
Restart=always
StandardOutput=syslog
StandardError=syslog
SyslogIdentifier=...
[Install]
WantedBy=multi-user.target

19. —
$ systemctl daemon-reload
$ systemctl start [service-name]
$ systemctl enable [service-name]
$ systemctl status [service-name]

20. Nginx
—
$ vim /etc/nginx/sites-available/[site-name]

21. Nginx
—
server {
listen 80;
listen [::]:80;
server_name ...;
location / {
proxy_pass http://localhost:8080/;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Port $server_port;
}
}

22. Nginx
—
$ ln -s /etc/nginx/sites-available/[site-name]
/etc/nginx/sites-enabled/
$ nginx -t
$ systemctl restart nginx

23. SSL
—
$ add-apt-repository
ppa:certbot/certbot
$ apt install python-certbot-nginx
$ systemctl reload nginx
$ certbot --nginx -d [site-url]

24. …
—
• /
• DNS
•

25. —
• Ktor Fat Jar
• JVM Nginx
• Ktor Linux Service
• Nginx Service SSL

26. —
• GCP - DevFest HK 2020
• Heroku -
• - (https://ktor.io/docs/deploy.html)

27. kotlin.tips
Kotlin
—

28. Shengyou Fan ( )
shengyou.fan@jetbrains.com
Q&A
—
Ktor
Fat Jar