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---
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title: "[筆記] 在 ubuntu 20.04 上安裝 wireguard + pihole 作 AD Blocking/install wireguard and pihole to do ad block in ubuntu 20.04 "
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date: 2020-08-13T14:22:05+08:00
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draft: false
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noSummary: false
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categories: ['筆記']
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image: https://h.cowbay.org/images/post-default-16.jpg
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tags: ['wireguard','pihole','ubuntu']
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author: "Eric Chang"
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keywords:
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- wireguard
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- Pihole
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---
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手機上的廣告越來越討厭了
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但是用手機看頁面、影片的機會越來越高
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所以一直想看看有沒有什麼方式可以解決這個問題
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不只可以用在safari 上，連APP 裡面的廣告最好都能夠擋掉
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在github上面看到有個專案是 wireguard + pihole
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滿有趣的，就來研究一下
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<!--more-->
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我在google cloud console 申請了一台free tier 的 google compute engine (真難念，就叫VPS吧)
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免費的Google VPS 只能選擇美洲地區的機房，有點可惜，多少還是會有點影響
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作業系統選 ubuntu 20.04 minimal
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然後因為我習慣wireguard 的port 都設定在 12000
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所以要記得去開啟firewall 的 UDP 12000，然後套用在這台VPS上
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還有要設定 ssh 金鑰 這些都算是google compute engine 的基本設定，就不多說了
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系統的基本安裝完成後，接下來要用人家寫好的 script 來安裝 wireguard + pihole
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---
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#### 安裝基本套件
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因為是選擇 ubuntu 20.04 minimal 所以有很多套件都沒有，要先安裝這些基本套件
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```
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sudo apt update && sudo apt install -y vim git net-tools software-properties-common iptables python3-pip qrencode
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```
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#### 取得安裝script
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```
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mkdir git && cd git
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git clone https://github.com/racbart/wireguard-pihole
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```
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#### 修改 install.sh
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因為我的目的是只想要把DNS 查詢透過wireguard 丟去 pihole
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而不是把所有流量都轉給wireguard
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所以要修改一下剛剛clone 下來的 script
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```
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cd wireguard-pihole
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vim install.sh
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```
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有點忘了改了哪些東西，就大概說一下吧
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##### IPV4_ADDRESS
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原本的判斷VPS WAN IP 的指令在GCE上會抓到private ip
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所以要改一下，在 install.sh 中找到底下這行註解掉，並修改成其他指令
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```
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#IPV4_ADDRESS=$(ip addr list "$INTERFACE" | grep "inet " | xargs | cut -d " " -f 2)
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IPV4_ADDRESS=$(dig +short myip.opendns.com @resolver1.opendns.com)
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```
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##### install wireguard in ubuntu 20.04
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ubuntu 20.04 安裝wireguard 的方式和 18.04 有點差別，需要多裝一個 wireguard-dkms
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找到底下這行，註解掉，改成我們要的指令，python-pip 我們用 python3-pip 取代
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在一開始就已經先裝了，所以這邊不需要再裝一次
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```
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#apt install -y wireguard python-pip
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apt install -y wireguard wireguard-dkms
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```
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##### 啟用query logging
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找到底下這行，註解掉，改成啟用 query logging
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```
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#QUERY_LOGGING=false
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QUERY_LOGGING=true
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```
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存檔後離開
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然後執行
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```
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sudo ./install.sh
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```
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開始進行安裝，基本上是全自動的，應該沒有錯誤，可以順利跑完 (應該啦...)
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---
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接著來依照我自己的需求來修改一下 add-client.sh
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##### 修改 IPV4_ADDRESS
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找到底下這行註解掉，並修改成其他指令
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```
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#IPV4_ADDRESS=$(ip addr list "$INTERFACE" | grep "inet " | xargs | cut -d " " -f 2)
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IPV4_ADDRESS=$(dig +short myip.opendns.com @resolver1.opendns.com)
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```
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##### 改一下 port
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```
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#SERVER_PORT=$(cat /etc/wireguard/wg0.conf | grep ListenPort | rev | cut -d " " -f 1 | rev)
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SERVER_PORT=12000
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```
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##### display client and save conf
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找到底下這一段
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```
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echo "
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[Interface]
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PrivateKey = ${CLIENT_PRIVKEY}
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Address = ${NEXT_IP}/32
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DNS = 10.10.0.1
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[Peer]
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PublicKey = ${SERVER_PUBKEY}
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AllowedIPs = 0.0.0.0/0, ::/0
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Endpoint = ${SERVER_ADDRESS}:${SERVER_PORT}
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"
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```
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改成
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```
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# Display client config
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echo "
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[Interface]
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PrivateKey = ${CLIENT_PRIVKEY}
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Address = ${NEXT_IP}/32
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DNS = 10.10.0.1
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[Peer]
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PublicKey = ${SERVER_PUBKEY}
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#forware dns queries only,if want to forward all traffic , replace 10.10.0.1/32 to 0.0.0.0/0
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AllowedIPs = 10.10.0.1/32
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Endpoint = ${SERVER_ADDRESS}:${SERVER_PORT}"|tee ${CLIENT_NAME}.conf && qrencode -t ansiutf8 -l L < ${CLIENT_NAME}.conf
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```
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之後要新增 client
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就只要輸入
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```
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sudo bash add-client.sh "CLIENT_NAME"
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```
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就會在當前目錄底下產生 ${CLIENT_NAME}.conf 的設定檔，並顯示 qrcode
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而且也不用去管 client ip 發到哪了，script 會自己去計算
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再次強調，這只會把手機上的 dns 查詢透過wireguard指向到 pihole
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並不會把整個流量都改從wireguard 出去
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如果要改成都走wireguard 出去，那就把最後一段的 Endpoint 後面改成 0.0.0.0/0
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PC的話，wireguard 連上之後，要去手動修改DNS
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成功的話，在PC上可以看到這樣的查詢結果
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```
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peer: mVRp+fjHKW1/n/j5Cwn9zOlLsgtHsvoiNHPSn4bHLHg=
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endpoint: 23.34.45.67:12000
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allowed ips: 10.10.0.1/32
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latest handshake: 1 hour, 48 minutes, 39 seconds ago
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transfer: 1.46 KiB received, 1.30 KiB sent
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2020-08-13 15:42:11 [root@hqdc039 wireguard]$ dig @10.10.0.1 www.google.com.tw
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; <<>> DiG 9.16.1-Ubuntu <<>> @10.10.0.1 www.google.com.tw
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; (1 server found)
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;; global options: +cmd
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;; Got answer:
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;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25532
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;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
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;; OPT PSEUDOSECTION:
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; EDNS: version: 0, flags:; udp: 1232
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;; QUESTION SECTION:
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;www.google.com.tw. IN A
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;; ANSWER SECTION:
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www.google.com.tw. 297 IN A 64.233.177.94
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;; Query time: 399 msec
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;; SERVER: 10.10.0.1#53(10.10.0.1)
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;; WHEN: Thu Aug 13 15:42:24 CST 2020
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;; MSG SIZE rcvd: 79
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2020-08-13 15:42:24 [root@hqdc039 wireguard]$
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```
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