Connect to Cloudflare 1.1.1.1 using DoH clients on Ubuntu

Download and install the cloudflared daemon

Or Download and install cloudflared via the Cloudflare Package Repository.

Ubuntu 20.04 LTS (Focal Fossa)

# Add cloudflare gpg key
sudo mkdir -p --mode=0755 /usr/share/keyrings
curl -fsSL https://pkg.cloudflare.com/cloudflare-main.gpg | sudo tee /usr/share/keyrings/cloudflare-main.gpg >/dev/null

# Add this repo to your apt repositories
echo 'deb [signed-by=/usr/share/keyrings/cloudflare-main.gpg] https://pkg.cloudflare.com/cloudflared focal main' | sudo tee /etc/apt/sources.list.d/cloudflared.list

# install cloudflared
sudo apt-get update && sudo apt-get install cloudflared
cloudflared --version

Run without systemd

cloudflared proxy-dns
#cloudflared proxy-dns --port 5553

Run with systemd

sudo tee /etc/systemd/system/cloudflared-proxy-dns.service >/dev/null <<EOF
[Unit]
Description=DNS over HTTPS (DoH) proxy client
Wants=network-online.target nss-lookup.target
Before=nss-lookup.target

[Service]
AmbientCapabilities=CAP_NET_BIND_SERVICE
CapabilityBoundingSet=CAP_NET_BIND_SERVICE
DynamicUser=yes
ExecStart=/usr/local/bin/cloudflared proxy-dns

[Install]
WantedBy=multi-user.target
EOF
sudo systemctl enable --now cloudflared-proxy-dns
sudo rm -f /etc/resolv.conf
echo nameserver 127.0.0.1 | sudo tee /etc/resolv.conf >/dev/null

Finally, verify it locally with:

dig +short @127.0.0.1 cloudflare.com AAAA

Update cloudflared

cloudflared update

References
https://developers.cloudflare.com/1.1.1.1/encryption/dns-over-https/dns-over-https-client/
https://pkg.cloudflare.com/index.html

Indexes in Entity Framework Data Annotations

[Index(nameof(Url))]
public class Blog
{
    public int BlogId { get; set; }
    public string Url { get; set; }
}

Composite index

[Index(nameof(FirstName), nameof(LastName))]
public class Person
{
    public int PersonId { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
}

Index uniqueness

[Index(nameof(Url), IsUnique = true)]
public class Blog
{
    public int BlogId { get; set; }
    public string Url { get; set; }
}

Index sort order

[Index(nameof(Url), nameof(Rating), AllDescending = true)]
public class Blog
{
    public int BlogId { get; set; }
    public string Url { get; set; }
    public int Rating { get; set; }
}
[Index(nameof(Url), nameof(Rating), IsDescending = new[] { false, true })]
public class Blog
{
    public int BlogId { get; set; }
    public string Url { get; set; }
    public int Rating { get; set; }
}

Index name

[Index(nameof(Url), Name = "Index_Url")]
public class Blog
{
    public int BlogId { get; set; }
    public string Url { get; set; }
}

References
https://learn.microsoft.com/en-us/ef/core/modeling/indexes?tabs=data-annotations

Configuration options for the dependabot.yml for .net Projects

# generated by dependadotnet
# https://github.com/dotnet/core/tree/main/samples/dependadotnet
version: 2
updates:
  - package-ecosystem: "nuget"
    directory: "/azure/sdk-identity-resources-storage" #AzureIdentityStorageExample.csproj
    schedule:
      interval: "weekly"
      day: "wednesday"
    open-pull-requests-limit: 5
  - package-ecosystem: "nuget"
    directory: "/csharp/expression-trees" #expression-trees.csproj
    schedule:
      interval: "weekly"
      day: "wednesday"
    open-pull-requests-limit: 5
  - package-ecosystem: "nuget"
    directory: "/core/assembly/MetadataLoadContext" #MetadataLoadContextSample.csproj
    schedule:
      interval: "weekly"
      day: "wednesday"
    open-pull-requests-limit: 5

References
https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
https://github.com/dotnet/samples/blob/main/.github/dependabot.yml

Install Xray + VLESS + WS + TLS + Apache + CDN on Ubuntu

Install required Ubuntu packages

apt install -y chrony
timedatectl set-ntp true
systemctl enable chrony && systemctl restart chrony
timedatectl set-timezone Asia/Tehran
chronyc sourcestats -v
chronyc tracking -v
date

Install Certbot

sudo snap install core; sudo snap refresh core
sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/certbot
sudo certbot certonly --standalone

result

# Certificate is saved at: /etc/letsencrypt/live/example.com/fullchain.pem
# Key is saved at:         /etc/letsencrypt/live/example.com/privkey.pem

Xray

bash -c "$(curl -L https://github.com/XTLS/Xray-install/raw/main/install-release.sh)" @ install -u root
# xray remove
# bash -c "$(curl -L https://github.com/XTLS/Xray-install/raw/main/install-release.sh)" @ remove --purge
# /etc/systemd/system/xray.service
# /usr/local/bin/xray run -config /usr/local/etc/xray/config.json
nano /usr/local/etc/xray/config.json
{
    "log": {
        "loglevel": "warning"
    },
    "inbounds": [
        {
            "port": 10002,
            "listen": "127.0.0.1",
            "protocol": "vless",
            "settings": {
                "clients": [
                    {
                        "id": "559f6df4-0a3c-4f5f-bb95-d17888b16361",
                        "level": 0,
                        "email": "love@example.com"
                    }
                ],
                "decryption": "none"
            },
            "streamSettings": {
                "network": "ws",
                "security": "none",
                "wsSettings": {
                    "path": "/xray"
                }
            }
        }
    ],
    "outbounds": [
        {
            "protocol": "freedom", 
            "settings": { }, 
            "tag": "direct"
        }, 
        {
            "protocol": "blackhole", 
            "settings": { }, 
            "tag": "blocked"
        }
    ],
    "dns": {
    "servers": [
      "https+local://1.1.1.1/dns-query",
      "1.1.1.1",
      "1.0.0.1",
      "8.8.8.8",
      "8.8.4.4",
      "localhost"
    ]
  }
}

Xray Dat Path

/usr/local/share/xray

Apache

nano /etc/apache2/apache2.conf

<VirtualHost *:80>
    Servername example.com
    RewriteEngine on
    RewriteCond %{SERVER_NAME} =example.com
    RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URL} [END,NE,R=permanent]
</VirtualHost>
<VirtualHost *:443>
    # change your domain
    ServerName example.com
    # you may have a different root
    DocumentRoot /var/www/
    # the SSL configuration enable https for your site and it’s also required by shadowsocks + v2ray
    SSLEngine on
    SSLCertificateFile /etc/letsencrypt/live/example.com/fullchain.pem
    SSLCertificateKeyFile /etc/letsencrypt/example.com/privkey.pem
    SSLProtocol All -SSLv2 -SSLv3 -TLSv1 -TLSv1.1 +TLSv1.2 +TLSv1.3
    SSLCipherSuite HIGH:!aNULL
    <Location "/xray">
    ProxyPass ws://127.0.0.1:10002/xray
    ProxyAddHeaders Off
    ProxyPreserveHost On
    RequestHeader append X-Forwarded-For %{REMOTE_ADDR}s
    </Location>
</VirtualHost>

References
https://github.com/XTLS/Xray-core
https://github.com/XTLS/Xray-examples
https://github.com/v2fly/v2ray-examples
https://github.com/XTLS/Xray-install