diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
new file mode 100644
index 00000000..2d7932f8
--- /dev/null
+++ b/.devcontainer/devcontainer.json
@@ -0,0 +1,21 @@
+{
+  "name": "rcore-tutorial-v3",
+  "build": {
+    "dockerfile": "../Dockerfile",
+    "args": {
+      "QEMU_VERSION": "7.0.0",
+      "DEBIAN_FRONTEND": "noninteractive",
+      "GDB_VERSION": "14.1"
+    }
+  },
+  "postCreateCommand": "rustup show",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "rust-lang.rust-analyzer",
+        "ms-vscode.cpptools",
+        "tamasfe.even-better-toml"
+      ]
+    }
+  }
+}
diff --git a/.gitignore b/.gitignore
index 78059028..7e20e835 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,9 +1,12 @@
 .*/*
 !.github/*
 !.vscode/settings.json
+!.devcontainer/devcontainer.json
+
 .idea
-Cargo.lock
-target
+**/Cargo.lock
+**/target/
+
 os/src/link_app.S
 os/src/linker.ld
 os/last-*
diff --git a/Dockerfile b/Dockerfile
index 284db4cf..a3654757 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -7,16 +7,17 @@
 FROM ubuntu:20.04
 
 ARG QEMU_VERSION=7.0.0
+ARG GDB_VERSION=14.1
 ARG HOME=/root
 
 # 0. Install general tools
 ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && \
     apt-get install -y \
-        curl \
-        git \
-        python3 \
-        wget
+    curl \
+    git \
+    python3 \
+    wget
 
 # 1. Set up QEMU RISC-V
 # - https://learningos.github.io/rust-based-os-comp2022/0setup-devel-env.html#qemu
@@ -29,13 +30,18 @@ WORKDIR ${HOME}
 RUN wget https://download.qemu.org/qemu-${QEMU_VERSION}.tar.xz && \
     tar xvJf qemu-${QEMU_VERSION}.tar.xz
 
+RUN wget https://ftp.gnu.org/gnu/gdb/gdb-${GDB_VERSION}.tar.xz && \
+    tar xvJf gdb-${GDB_VERSION}.tar.xz
+
 # 1.2. Install dependencies
 # - https://risc-v-getting-started-guide.readthedocs.io/en/latest/linux-qemu.html#prerequisites
 RUN apt-get install -y \
-        autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev \
-        gawk build-essential bison flex texinfo gperf libtool patchutils bc \
-        zlib1g-dev libexpat-dev git \
-        ninja-build pkg-config libglib2.0-dev libpixman-1-dev libsdl2-dev
+    autoconf automake autotools-dev curl libmpc-dev libmpfr-dev libgmp-dev \
+    gawk build-essential bison flex texinfo gperf libtool patchutils bc \
+    zlib1g-dev libexpat-dev git \
+    ninja-build pkg-config libglib2.0-dev libpixman-1-dev libsdl2-dev \
+    libncurses5-dev python2 python2-dev libreadline-dev tmux
+
 
 # 1.3. Build and install from source
 WORKDIR ${HOME}/qemu-${QEMU_VERSION}
@@ -43,9 +49,14 @@ RUN ./configure --target-list=riscv64-softmmu,riscv64-linux-user && \
     make -j$(nproc) && \
     make install
 
+WORKDIR ${HOME}/gdb-${GDB_VERSION}
+RUN ./configure --prefix=/usr/local --target=riscv64-unknown-elf --enable-tui=yes && \
+    make -j$(nproc) && \
+    make install
+
 # 1.4. Clean up
 WORKDIR ${HOME}
-RUN rm -rf qemu-${QEMU_VERSION} qemu-${QEMU_VERSION}.tar.xz
+RUN rm -rf qemu-${QEMU_VERSION} qemu-${QEMU_VERSION}.tar.xz ${HOME}/gdb-${GDB_VERSION} gdb-${GDB_VERSION}.tar.xz
 
 # 1.5. Sanity checking
 RUN qemu-system-riscv64 --version && \
@@ -73,13 +84,5 @@ RUN rustup --version && \
     cargo --version && \
     rustc --version
 
-# 3. Build env for labs
-# See os1/Makefile `env:` for example.
-# This avoids having to wait for these steps each time using a new container.
-RUN rustup target add riscv64gc-unknown-none-elf && \
-    cargo install cargo-binutils --vers ~0.2 && \
-    rustup component add rust-src && \
-    rustup component add llvm-tools-preview
-
 # Ready to go
 WORKDIR ${HOME}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index dd54f2ef..61bbf13c 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -3,3 +3,4 @@ profile = "minimal"
 # use the nightly version of the last stable toolchain, see <https://forge.rust-lang.org/>
 channel = "nightly-2024-01-18"
 components = ["rust-src", "llvm-tools-preview", "rustfmt", "clippy"]
+targets = ["riscv64gc-unknown-none-elf"]