使用 Docker 启动时支持从环境变量初始化配置文件

Dockerfile

@@ -45,6 +45,6 @@ COPY static static
 
 COPY views views
 
-#ENTRYPOINT [ "/app/PrometheusAlert" ]
+COPY docker-entrypoint.sh docker-entrypoint.sh
 
-CMD if [ ! -f /app/db/PrometheusAlertDB.db ];then cp /opt/PrometheusAlertDB.db /app/db/PrometheusAlertDB.db;echo 'init ok!';else echo 'pass!';fi && /app/PrometheusAlert
+ENTRYPOINT [ "/bin/sh", "/app/docker-entrypoint.sh" ]

README.MD

@@ -84,6 +84,23 @@ curl http://localhost:8080/health
 #默认登录帐号和密码在app.conf中有配置
 ```
 
+## Docker
+
+配置文件 app.conf 的内容可以使用环境变量的方式初始化。
+
+所设置的变量前缀必须以 `PA_` 开始，后面使用配置文件的配置项名称，特别注意的是此配置对大小写并不敏感。
+
+示例
+
+```
+docker run -d \
+-e PA_LOGIN_USER=prometheusalert
+-e PA_LOGIN_PASSWORD=prometheusalert
+-e PA_TITLE=PrometheusAlert
+feiyu563/prometheus-alert
+```
+
+所有的配置文件内容请[点击此处](https://github.com/feiyu563/PrometheusAlert/blob/master/conf/app-example.conf)查看
 
 <br>
 <br>

docker-entrypoint.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+if [ ! -f /app/db/PrometheusAlertDB.db ]; then
+    cp /opt/PrometheusAlertDB.db /app/db/PrometheusAlertDB.db
+    echo 'init ok!'
+else
+    echo 'pass!'
+fi
+
+if env | grep -q '^PA_[^=].\+'; then
+    for VAR_NAME in $(env | grep '^PA_[^=].\+' | sed -r "s/^PA_([^=]*).*/\1/g"); do
+        VAL_CONTENT=$(eval echo \${PA_${VAR_NAME}})
+        echo "Config overridden from Environment variable, var=${VAR_NAME}=${VAL_CONTENT}"
+        sed -i -E "s/(${VAR_NAME})(\ *=\ *).*/\1\2${VAL_CONTENT}/i" /app/conf/app.conf
+    done
+fi
+
+exec /app/PrometheusAlert