chore: add resolver to Cargo.toml and update README.md and justfile

Cargo.toml

@@ -1,2 +1,3 @@
 [workspace]
 members = ["xtask", "app", "common"]
+resolver = "2"

README.md

@@ -1,2 +1,56 @@
 # dnstop
 An efficient DNS monitoring tool based on eBPF
+
+## Introduction
+
+`dnstop` is attached to a specific network interface and simply outputs the results of DNS queries and responses that are forwarded to it in the form shown below.
+
+```sh
+REQ: ID=40797 SRC=192.168.64.6:54110 DST=192.168.64.1:53 DNS_NAME=www.google.com DNS_TYPE=A DNS_CLASS=IN
+REQ: ID=39114 SRC=192.168.64.6:40193 DST=192.168.64.1:53 DNS_NAME=www.google.com DNS_TYPE=AAAA DNS_CLASS=IN
+OK: ID=40797 DNS_NAME=www.google.com DNS_TYPE=A DNS_CLASS=IN
+OK: ID=39114 DNS_NAME=www.google.com DNS_TYPE=AAAA DNS_CLASS=IN
+REQ: ID=25132 SRC=192.168.64.6:44543 DST=192.168.64.1:53 DNS_NAME=www.woogole.com DNS_TYPE=A DNS_CLASS=IN
+REQ: ID=55755 SRC=192.168.64.6:39533 DST=192.168.64.1:53 DNS_NAME=www.woogole.com DNS_TYPE=AAAA DNS_CLASS=IN
+NXDOMAIN: ID=25132 DNS_NAME=www.woogole.com DNS_TYPE=A DNS_CLASS=IN
+NXDOMAIN: ID=55755 DNS_NAME=www.woogole.com DNS_TYPE=AAAA DNS_CLASS=IN
+REQ: ID=42662 SRC=192.168.64.6:34430 DST=192.168.64.1:53 DNS_NAME=www.woogole.com DNS_TYPE=A DNS_CLASS=IN
+REQ: ID=42543 SRC=192.168.64.6:48084 DST=192.168.64.1:53 DNS_NAME=www.woogole.com DNS_TYPE=AAAA DNS_CLASS=IN
+NXDOMAIN: ID=42662 DNS_NAME=www.woogole.com DNS_TYPE=A DNS_CLASS=IN
+NXDOMAIN: ID=42543 DNS_NAME=www.woogole.com DNS_TYPE=AAAA DNS_CLASS=IN
+```
+
+## Prerequisites
+
+- Rust
+- Docker
+- Justfile
+
+## How to use
+
+### 1. clone the repository
+
+```bash
+git clone https://github.com/wqld/dnstop.git
+```
+
+### 2. build the project
+
+```bash
+just build-image
+```
+
+You can specify the target architecture as follows. (The default is aarch64).
+
+```bash
+just build-image --arch x86_64
+```
+
+### 3. run the container
+
+It requires privileged privileges because it needs to run the eBPF program.
+Specify the network interface to watch for DNS packets with the `--iface` option.
+
+```bash
+docker run --privileged --rm --network host dnstop:manually --iface enp0s1
+```

justfile

@@ -1,4 +1,6 @@
+arch := "aarch64"
+
 build-image:
     cargo xtask build-ebpf
-    cargo build --target aarch64-unknown-linux-musl
-    docker build --build-arg ARCH=aarch64 -t dnstop:test .
+    cargo build --target {{ arch }}-unknown-linux-musl
+    docker build --build-arg ARCH={{ arch }} -t dnstop:manually .