【Docker入门】Docker教程(亲自动手)
首先
Docker入門。とりあえず、手を動かして理解する。
学习主题
创建一个 Docker 容器，在每秒钟输出一次 HelloWorld。
~/develop/docker/cron_task$ tree
.
├── Dockerfile
├── cronjob
├── docker-compose.yml
└── my_script.ts
1 directory, 4 files
FROM node:14
# ソースコードをコピー
COPY my_script.ts /app/my_script.ts
# ワーキングディレクトリの設定
WORKDIR /app
# 必要なパッケージのインストール
RUN npm install typescript -g
# TypeScriptのコンパイル
RUN tsc my_script.ts
# cronジョブの設定ファイルをコピー
COPY cronjob /etc/cron.d/my_cronjob
# 設定ファイルの権限を変更
RUN chmod 0644 /etc/cron.d/my_cronjob
# cronデーモンを起動
CMD cron && tail -f /var/log/cron.log
version: '3'
services:
my_container:
build:
context: .
dockerfile: Dockerfile
volumes:
- ./my_script.ts:/app/my_script.ts
command: ["node", "my_script.js"]
const interval = process.env.INTERVAL || 10;
const helloWorld = () => {
console.log('Hello, World!');
};
const helloWorldInterval = setInterval(helloWorld, parseInt(interval) * 1000);
const main = () => {
console.log('===============start=================');
helloWorldInterval;
};
// main 関数を実行する
main();
#動作確認のため、app.tsを実行
~/develop/docker/cron_task$ tree
.
├── Dockerfile
├── cronjob
├── docker-compose.yml
└── my_script.ts
1 directory, 4 files
function sayHello() {
console.log('Hello, World!');
}
setInterval(sayHello, 10000);
* * * * * root node /app/my_script.js
FROM node:14
# ソースコードをコピー
COPY my_script.ts /app/my_script.ts
# ワーキングディレクトリの設定
WORKDIR /app
# 必要なパッケージのインストール
RUN npm install typescript -g
# TypeScriptのコンパイル
RUN tsc my_script.ts
# cronジョブの設定ファイルをコピー
COPY cronjob /etc/cron.d/my_cronjob
# 設定ファイルの権限を変更
RUN chmod 0644 /etc/cron.d/my_cronjob
# cronデーモンを起動
CMD cron && tail -f /var/log/cron.log
version: '3'
services:
my_container:
build:
context: .
dockerfile: Dockerfile
volumes:
- ./my_script.ts:/app/my_script.ts
command: ["node", "my_script.js"]
~/develop/docker/cron_task$ docker-compose up --build
[+] Building 5.6s (12/12) FINISHED
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 581B 0.0s
=> [internal] load metadata for docker.io/library/node:14 1.7s
=> CACHED [1/7] FROM docker.io/library/node:14@sha256:a158d3b9b4e3fa813fa6c8c590b8f0a860e015ad4e59bbce5744d2f6fd8461aa 0.0s
=> [internal] load build context 0.0s
=> => transferring context: 233B 0.0s
=> [2/7] COPY my_script.ts /app/my_script.ts 0.0s
=> [3/7] WORKDIR /app 0.0s
=> [4/7] RUN npm install typescript -g 2.5s
=> [5/7] RUN tsc my_script.ts 1.0s
=> [6/7] COPY cronjob /etc/cron.d/my_cronjob 0.0s
=> [7/7] RUN chmod 0644 /etc/cron.d/my_cronjob 0.3s
=> exporting to image 0.1s
=> => exporting layers 0.1s
=> => writing image sha256:5318c08da26326f10d55efca2fe0ac2fa2483ec28b6c92884efa3ee2cf2e1004 0.0s
=> => naming to docker.io/library/cron_task-my_container 0.0s
[+] Running 1/0
✔ Container cron_task-my_container-1 Recreated 0.1s
Attaching to cron_task-my_container-1
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
cron_task-my_container-1 | Hello, World!
暫時完成了。但是在應用程序上每10秒執行一次。嗯…感覺還不夠好。下次將在以後改進。
