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.devcontainer/devcontainer.json Normal file
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// For format details, see https://aka.ms/devcontainer.json. For config options, see the
// README at: https://github.com/devcontainers/templates/tree/main/src/debian
{
"name": "Debian",
// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
"image": "mcr.microsoft.com/devcontainers/base:bullseye",
"features": {
"ghcr.io/devcontainers/features/docker-in-docker:2": {}
}
// Features to add to the dev container. More info: https://containers.dev/features.
// "features": {},
// Use 'forwardPorts' to make a list of ports inside the container available locally.
// "forwardPorts": [],
// Configure tool-specific properties.
// "customizations": {},
// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
// "remoteUser": "root"
}

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FROM busybox
LABEL maintainer="Irul <irul@bteklabs.com>"
COPY html/index.html entrypoint.sh /
ENV MESSAGE="Sorry for the inconvenience but we\&rsquo;re performing some maintenance at the moment. If you need to you can always <a href=\"mailto:{{mail}}\">{{contact}}<\/a>, otherwise we\&rsquo;ll be back online shortly!"
ENV HEADLINE="We\&rsquo;ll be back soon!"
ENV MAIL_ADDRESS=mail@example.com
ENV PORT=8080
ENV TEAM_NAME="The Team"
ENV TITLE="Site Maintenance"
ENV LINK_COLOR="#dc8100"
ENV THEME="Light"
ENV RESPONSE_CODE="503 Service Unavailable"
ENV CONTACT_LINK="contact us"
ENTRYPOINT [ "./entrypoint.sh" ]

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# Maintenance
A simple maintenance page in a simple docker image.
## Contents
1. Introduction
- Environment variables.
2. Docker.
3. Docker Compose.
## Introduction
This image came as a result for the need to place a simple maintenance page in times of server downtime or maintenance. The main requirement was to use a simple static HTML file.
#### Environment variables
We introduced a few variables that would change different parts of the maintenance page as shown below.
|Variable|Description |
|--|--|
|`TITLE`|Modifies the site *title* displayed. Defaults to `Site Maintenance`|
|`HEADLINE`| H1 headline Defaults to `We'll be back soon!` |
|`MESSAGE`| Page message Defaults to `Sorry for the inconvenience but we're performing some maintenance at the moment. If you need to you can always {{contact}}, otherwise we'll be back online shortly!`.<br><br>**Note**: include `{{contact}}` in your custom message as placeholder for the contact link. |
|`CONTACT_LINK`| Set the word you want to use instead of the default `contact us`. |
|`MAIL_ADDRESS`| This modifies the email address provided for the *contact us* link in the page. Defaults to `mail@example.com`|
|`TEAM_NAME`| Modifies the *team* or *company name* displayed on the page. Defaults to `The Team`|
|`LINK_COLOR`|Modifies the link color for the *contact us* link. Defaults to `#dc8100` |
|`THEME`|Modifies page theme current options `Light` or `Dark`. Defaults to `Light`
|`RESPONSE_CODE`| Specifies the HTTP response code to serve with the maintenance page. Defaults to `503 Service Unavailable` |
|`PORT`| Specifies the port to serve the maintenance page. Defaults to `8080` |
## Docker
You can easily run or create a docker container for this [image](https://git.libra.bteklabs.com/irul/maintenance) by using the command:
`docker run -p 80:8080 git.libra.bteklabs.com/irul/maintenance`
This will serve the *default* static maintenance page on port 80 of the host machine. You can modify specific variables within the run command which would then look like:
`docker run -e TEAM_NAME='Team name' -e TITLE='Oops!' -e MAIL_ADDRESS=mail@domain.com -e PORT=9000 --rm -p 80:9000 git.libra.bteklabs.com/irul/maintenance`
## Docker Compose
For docker compose, you can choose to refer to the *docker-compose.yml* file in the [repo](https://git.libra.bteklabs.com/irul/maintenance) or you can have look at the example below.
```
version: '3.5'
services:
maintenance:
image: git.libra.bteklabs.com/irul/maintenance
container_name: maintenance-page
environment:
TEAM_NAME: "Team name"
TITLE: "Oops!"
MAIL_ADDRESS: "mail@domain.com"
LINK_COLOR: "#dc8100"
THEME: "Light"
PORT: 8080
RESPONSE_CODE: "503 Service Unavailable"
MESSAGE: "This is my custom message. {{contact}} now"
CONTACT_LINK: "contact us"
ports:
- 80:8080
```

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version: '3.5'
services:
maintenance:
image: git.libra.bteklabs.com/irul/maintenance
container_name: maintenance-page
environment:
TEAM_NAME: "Team name"
TITLE: "Oops!"
MAIL_ADDRESS: "mail@domain.com"
LINK_COLOR: "#dc8100"
THEME: "Light"
PORT: 8080
RESPONSE_CODE: "503 Service Unavailable"
MESSAGE: "Sorry for the inconvenience but we're performing some maintenance at the moment. If you need to you can always {{contact}}, otherwise we'll be back online shortly!"
CONTACT_LINK: "contact us"
ports:
- 8080:8080

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entrypoint.sh Executable file
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#! /bin/sh
sed -i "s/{{message}}/$(echo ${MESSAGE})/g" index.html
sed -i "s/{{contact}}/$(echo ${CONTACT_LINK})/g" index.html
sed -i "s/{{mail}}/$(echo ${MAIL_ADDRESS})/g" index.html
sed -i "s/{{headline}}/$(echo ${HEADLINE})/g" index.html
sed -i "s/{{team_name}}/$(echo ${TEAM_NAME})/g" index.html
sed -i "s/{{title}}/$(echo ${TITLE})/g" index.html
sed -i "s/{{theme}}/$(echo ${THEME})/g" index.html
sed -i "s/{{link_color}}/$(echo ${LINK_COLOR})/g" index.html
while true; do { echo -e "HTTP/1.1 ${RESPONSE_CODE}\r\n"; echo "$(cat index.html)"; } | nc -lvp "$PORT"; done

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<!doctype html><meta charset="UTF-8"><head><title>{{title}}</title><style>body{text-align: center; padding: 20px;}@media (min-width: 768px){body{padding-top: 100px;}}h1{font-size: 50px;}body{font: 20px Helvetica, sans-serif; color: #333;}article{display: block; text-align: left; max-width: 650px; margin: 0 auto;}a{color:{{link_color}}; text-decoration: none;}a:hover{color: #333; text-decoration: none;}</style><script type="text/javascript">function applyTheme(){var themeType="{{theme}}";if(themeType==="Dark"){document.body.style.backgroundColor="#2a2e35";document.body.style.color="#b2becd";}if(themeType==="Light"){document.body.style.backgroundColor="white";document.body.style.color="black";}}window.onload=function(){applyTheme();};</script></head><body><article><h1>{{headline}}</h1><div><p>{{message}}</p><p>&mdash;{{team_name}}</p></div></article></body>

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<!doctype html>
<meta charset="UTF-8">
<head>
<title>{{title}}</title>
<style>
body {
text-align: center;
padding: 20px;
}
@media (min-width: 768px) {
body {
padding-top: 100px;
}
}
h1 {
font-size: 50px;
}
body {
font: 20px Helvetica, sans-serif;
color: #333;
}
article {
display: block;
text-align: left;
max-width: 650px;
margin: 0 auto;
}
a {
color: {{link_color}};
text-decoration: none;
}
a:hover {
color: #333;
text-decoration: none;
}
</style>
</head>
<body>
<article>
<h1>{{headline}}</h1>
<div>
<p>{{message}}</p>
<p>&mdash; {{team_name}}</p>
</div>
</article>
</body>

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<!doctype html><meta charset="UTF-8"><head> <title>{{title}}</title> <style>body{text-align: center; padding: 20px;}@media (min-width: 768px){body{padding-top: 150px;}}h1{font-size: 50px;}body{font: 20px Helvetica, sans-serif; color: #333;}article{display: block; text-align: left; max-width: 650px; margin: 0 auto;}a{color: #dc8100; text-decoration: none;}a:hover{color: #333; text-decoration: none;}</style></head><body> <article> <h1>{{headline}}</h1> <div> <p>{{message}}</p><p>&mdash;{{team_name}}</p></div></article></body>