diff --git a/.dockerignore b/.dockerignore
index f775f46..5834526 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,7 +1,4 @@
+.github/
 .vscode/
-tmp/
-test-collection/
-target/
-rclone/
-postman/
-docker/
\ No newline at end of file
+.devcontainer/
+target/
\ No newline at end of file
diff --git a/.github/workflows/docker-publish-judger.yml b/.github/workflows/docker-publish-judger.yml
index ba9130d..35bfcb1 100644
--- a/.github/workflows/docker-publish-judger.yml
+++ b/.github/workflows/docker-publish-judger.yml
@@ -70,7 +70,7 @@ jobs:
         id: build-and-push
         uses: docker/build-push-action@v5
         with:
-          file: docker/judger.dockerfile
+          file: Dockerfile
           context: .
           push: ${{ github.event_name != 'pull_request' }}
           tags: ${{ steps.meta.outputs.tags }}
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..f2d4ec2
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,28 @@
+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      // This name overrides rust-analyzer's debugging settings
+      "name": "run judger",
+      "type": "cppdbg",
+      "request": "launch",
+      "program": "${workspaceFolder}/target/debug/judger",
+      "args": [],
+      "stopAtEntry": false,
+      "cwd": "${workspaceFolder}/judger/envs/development",
+      "environment": [],
+      "externalConsole": false,
+      "MIMode": "gdb",
+      "preLaunchTask": "build debug judger",
+      "setupCommands": [
+        {
+          "text": "-enable-pretty-printing",
+          "ignoreFailures": true
+        }
+      ]
+    }
+  ]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
index 09a44cd..fd0b8e8 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,14 +1,6 @@
 {
   "material-icon-theme.folders.associations": {
     "judge-core": "core",
-    "judge-cli": "command",
-    "judge-service": "helper",
-    "judge-server": "server",
-    "postman": "api"
-  },
-  "rust-analyzer.linkedProjects": [
-    "./judger/Cargo.toml",
-    "./judger/Cargo.toml",
-    "./judger/Cargo.toml"
-  ]
+    "judger": "app"
+  }
 }
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..8f01a88
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,13 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "build debug judger",
+      "type": "shell",
+      "command": "cargo",
+      "args": ["build", "--bin", "judger"]
+    }
+  ]
+}
diff --git a/docker/judger.dockerfile b/Dockerfile
similarity index 72%
rename from docker/judger.dockerfile
rename to Dockerfile
index 5bdc7cd..ade2178 100644
--- a/docker/judger.dockerfile
+++ b/Dockerfile
@@ -1,9 +1,9 @@
 FROM rust:latest as build
 
-COPY judge-core /usr/src/judge-core
-COPY judger /usr/src/judger
-WORKDIR /usr/src/judger
+COPY judge-core/ /usr/src/judge-core
+COPY judger/     /usr/src/judger
 
+WORKDIR /usr/src/judger
 RUN apt update && apt install -y libseccomp-dev gcc
 RUN cargo build --bin judger --release
 
@@ -16,10 +16,10 @@ COPY --from=build /usr/src/judger/target/release/judger /usr/local/bin/judger
 RUN curl https://rclone.org/install.sh | bash
 
 RUN mkdir /workspace
-WORKDIR /workspace
-COPY data/default-rclone.conf /workspace/data/default-rclone.conf
-RUN mkdir /workspace/data/problem-package
+RUN mkdir /workspace/problem-package
+COPY judger/envs/docker/rclone.conf /workspace/rclone.conf
 
+WORKDIR /workspace
 ENV RUST_LOG=DEBUG
 EXPOSE 8000
 CMD [ "judger-server" ]
\ No newline at end of file
diff --git a/README.md b/README.md
index 38cd07b..270af5b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,5 @@
 # Judger
 
-![GitHub Workflow Status](https://img.shields.io/github/actions/workflow/status/OJ-lab/judger/rust-check.yml?logo=github&label=Tests)
 [![Discord](https://img.shields.io/discord/916955582181822486?label=Discord&color=blue&logo=discord&logoColor=white)](https://discord.gg/vh8NCgdp8J)
 ![Codespace Supported](https://img.shields.io/badge/Codespace_Supported-000000?style=flat&logo=github)
 
@@ -8,12 +7,27 @@ Judger is supposed to be a simple **sandbox service** which works for online-jud
 
 ## System
 
-judger-rs currently use `nix` to make necessary system invoke like `fork()`. 
+Judger currently use `nix` to make necessary system invoke like `fork()`.
 So you might need to check whether you are using the supported system from the main-page of [nix](https://github.com/nix-rust/nix).
 
 **Briefly speaking, judger-rs is now supposing you are decided to run it on linux.**
 We'll consider other platform, but in a lower priority.
 
+## Development
+
+Judger should works fine in VSCode with all recommended extensions installed.
+
+### Before you start
+
+You may need to setup your environment before you start.
+There is a setup script to help you quickly get ready.
+
+> 🥰 You won't need to run this script if you are using GitHub Codespaces.
+
+```sh
+./scripts/env_setup.bash
+```
+
 ## Contribute
 
 We have a guide in judger's [WIKI](https://github.com/OJ-lab/judger/wiki/Contribution-Guide)
diff --git a/docker/README.md b/docker/README.md
deleted file mode 100644
index 41688fa..0000000
--- a/docker/README.md
+++ /dev/null
@@ -1,9 +0,0 @@
-# Docker Build Guide
-
-⚠️ Do not use VSCode's `Build Image..` usage.
-
-Run the following command under project root instead.
-
-```sh
-docker build --pull --rm -f "docker/judger-server.dockerfile" -t oj-lab/judger-server:latest .
-```
diff --git a/judger/.env.development b/judger/.env.development
deleted file mode 100644
index 1f43dad..0000000
--- a/judger/.env.development
+++ /dev/null
@@ -1,4 +0,0 @@
-PORT=8081
-BASE_URL=http://localhost:8080/api/v1/judge
-INTERVAL=10
-RUST_LOG=DEBUG
\ No newline at end of file
diff --git a/judger/Cargo.toml b/judger/Cargo.toml
index acf6ddf..b1e2159 100644
--- a/judger/Cargo.toml
+++ b/judger/Cargo.toml
@@ -12,7 +12,7 @@ judge-core = { path = "../judge-core" }
 clap = { version = "4.0", features = ["derive"] }
 
 # Client
-reqwest = { version = "0.12.1", features = ["json"] }
+reqwest = { version = "0.12", features = ["json"] }
 
 # Async runtime
 tokio = { version = "1", features = ["full"] }
diff --git a/judger/envs/development/.env b/judger/envs/development/.env
new file mode 100644
index 0000000..098bb4f
--- /dev/null
+++ b/judger/envs/development/.env
@@ -0,0 +1,2 @@
+RUST_LOG=DEBUG
+FETCH_TASK_INTERVAL=10
diff --git a/judger/envs/development/.gitignore b/judger/envs/development/.gitignore
new file mode 100644
index 0000000..a4fd041
--- /dev/null
+++ b/judger/envs/development/.gitignore
@@ -0,0 +1 @@
+problem-package/
diff --git a/data/default-rclone.conf b/judger/envs/development/rclone.conf
similarity index 100%
rename from data/default-rclone.conf
rename to judger/envs/development/rclone.conf
diff --git a/judger/envs/docker/rclone.conf b/judger/envs/docker/rclone.conf
new file mode 100644
index 0000000..b35e71b
--- /dev/null
+++ b/judger/envs/docker/rclone.conf
@@ -0,0 +1,9 @@
+[minio]
+type = s3
+provider = Minio
+env_auth = false
+access_key_id = minio-root-user
+secret_access_key = minio-root-password
+endpoint = http://host.docker.internal:9000
+location_constraint =
+acl = private
\ No newline at end of file
diff --git a/judger/src/agent/platform/mod.rs b/judger/src/agent/platform/mod.rs
index 179d061..aedff46 100644
--- a/judger/src/agent/platform/mod.rs
+++ b/judger/src/agent/platform/mod.rs
@@ -54,7 +54,10 @@ async fn pick_task(client: &HttpClient) -> Result<JudgeTask, anyhow::Error> {
 
     match response.status() {
         reqwest::StatusCode::OK => Ok(response.json::<PickTaskResponse>().await?.task),
-        _ => Err(anyhow::anyhow!("Queue is empty")),
+        _ => {
+            log::error!("Failed to pick task: {:?}", response);
+            Err(anyhow::anyhow!("Queue is empty"))
+        }
     }
 }
 
diff --git a/judger/src/agent/rclone.rs b/judger/src/agent/rclone.rs
index 6978230..2a922ec 100644
--- a/judger/src/agent/rclone.rs
+++ b/judger/src/agent/rclone.rs
@@ -12,13 +12,21 @@ impl RcloneClient {
     }
 
     pub fn is_avaliable(&self) -> bool {
-        let status = Command::new("rclone")
+        let mut binding = Command::new("rclone");
+        let command = binding
             .arg("--config")
             .arg(format!("{}", self.config_path.to_string_lossy()))
+            .arg("--contimeout")
+            .arg("5s")
+            // HTTP request is a typical low level operation, which will retry for many times
+            // https://rclone.org/docs/#low-level-retries-number
+            // Here we set it to 3 to avoid long waiting time
+            .arg("--low-level-retries")
+            .arg("3")
             .arg("ls")
-            .arg("minio:")
-            .status()
-            .expect("Failed to rclone");
+            .arg("minio:");
+        log::debug!("Checking rclone with command: {:?}", command);
+        let status = command.status().expect("Failed to rclone");
 
         status.success()
     }
diff --git a/judger/src/main.rs b/judger/src/main.rs
index 6a87066..72434b8 100644
--- a/judger/src/main.rs
+++ b/judger/src/main.rs
@@ -1,7 +1,7 @@
 mod agent;
-mod env;
 mod error;
 mod handler;
+mod option;
 mod worker;
 
 #[macro_use]
@@ -12,16 +12,17 @@ use actix_web::{web::Data, App, HttpServer};
 use worker::JudgeWorker;
 
 #[actix_web::main] // or #[tokio::main]
+// The `Run` button provided by rust-analyzer will not work here
+// Use `Debug` button instead
 async fn main() -> std::io::Result<()> {
-    let opt = env::load_option();
-    env::setup_logger();
+    let opt = option::load_option();
 
     // TODO: Send heartbeat here to a remote host
 
     let worker = match JudgeWorker::new(
         opt.platform_uri,
         opt.fetch_task_interval,
-        opt.rclone_config,
+        opt.rclone_config_path,
         opt.problem_package_bucket.clone(),
         opt.problem_package_dir.clone(),
     ) {
diff --git a/judger/src/env/mod.rs b/judger/src/option.rs
similarity index 62%
rename from judger/src/env/mod.rs
rename to judger/src/option.rs
index 99db343..ec2de01 100644
--- a/judger/src/env/mod.rs
+++ b/judger/src/option.rs
@@ -6,20 +6,21 @@ use structopt::StructOpt;
 #[structopt(name = "judger")]
 pub struct JudgeServerOpt {
     /// For loading Opt from .env file
-    #[structopt(long)]
-    pub env_path: Option<String>,
+    #[structopt(long, default_value = ".env")]
+    pub env_path: PathBuf,
 
     /// Port to listen to
-    #[structopt(env = "PORT", default_value = "8080")]
+    #[structopt(env = "PORT", default_value = "8000")]
     pub port: u16,
 
     // TODO: make rclone optional
-    #[structopt(long, default_value = "data/default-rclone.conf")]
-    pub rclone_config: PathBuf,
+    #[structopt(env = "RCLONE_CONFIG_PATH", default_value = "rclone.conf")]
+    pub rclone_config_path: PathBuf,
     #[structopt(long, default_value = "oj-lab-problem-package")]
     pub problem_package_bucket: String,
+
     /// Where to store problem package
-    #[structopt(long, default_value = "data/problem-package")]
+    #[structopt(long, default_value = "problem-package")]
     pub problem_package_dir: PathBuf,
 
     #[structopt(env = "PLATFORM_URI", default_value = "http://localhost:8080/")]
@@ -29,21 +30,27 @@ pub struct JudgeServerOpt {
     pub fetch_task_interval: u64,
 }
 
+/// Try to load env from a .env file, if not found, fallback to ENV
 pub fn load_option() -> JudgeServerOpt {
+    println!("PWD: {:?}", std::env::current_dir().unwrap());
     // First load env_path from Args
     let opt = JudgeServerOpt::from_args();
-    if let Some(env_path) = opt.env_path {
-        dotenv::from_path(env_path).ok();
+    if opt.env_path.exists() {
+        println!("loading env from file: {:?}", opt.env_path);
+        dotenv::from_path(opt.env_path).ok();
     } else {
+        println!("loading env from ENV");
         dotenv::dotenv().ok();
     }
 
+    setup_logger();
+
     // Load opt again with ENV
     let opt = JudgeServerOpt::from_args();
     log::debug!("load opt: {:?}", opt);
     opt
 }
 
-pub fn setup_logger() {
+fn setup_logger() {
     env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("debug")).init();
 }
diff --git a/judger/src/worker/mod.rs b/judger/src/worker/mod.rs
index 4f2d6a4..c84cb25 100644
--- a/judger/src/worker/mod.rs
+++ b/judger/src/worker/mod.rs
@@ -46,6 +46,7 @@ impl JudgeWorker {
     }
 
     pub async fn run(&self) {
+        log::info!("judge task worker started");
         let _ = self
             .rclone_client
             .sync_bucket(&self.package_bucket, &self.package_dir)