install DoH only on Raspberry 1 model B+

dohinstall.sh

#install golang
export GOLANG="$(curl https://golang.org/dl/|grep armv6l|grep -v beta|head -1|awk -F\> {'print $3'}|awk -F\< {'print $1'})"
wget https://golang.org/dl/$GOLANG
sudo tar -C /usr/local -xzf $GOLANG
rm $GOLANG
unset GOLANG

#install DoH
git clone https://github.com/m13253/dns-over-https.git
cd dns-over-https
make
make install
nano /etc/dns-over-https/doh-client.conf

cat <<EOF >>/etc/dns-over-https/doh-client.conf
# DNS listen port
listen = [
    "0.0.0.0:53",
    "0.0.0.0:5380",
#    "[::1]:53",
#    "[::1]:5380",

    ## To listen on both 0.0.0.0:53 and [::]:53, use the following line
    # ":53",
]

# HTTP path for upstream resolver

[upstream]

# available selector: random or weighted_round_robin or lvs_weighted_round_robin
upstream_selector = "weighted_round_robin"

# weight should in (0, 100], if upstream_selector is random, weight will be ignored

#adguard
# Google's resolver, good ECS, good DNSSEC
#[[upstream.upstream_ietf]]
#    url = "https://dns.adguard.com/dns-query"
#    weight = 100


# Google's resolver, good ECS, good DNSSEC
[[upstream.upstream_ietf]]
    url = "https://dns.google/dns-query"
    weight = 50

## CloudFlare's resolver, bad ECS, good DNSSEC
## ECS is disabled for privacy by design: https://developers.cloudflare.com/1.1.1.1/nitty-gritty-details/#edns-client-subnet
[[upstream.upstream_ietf]]
    url = "https://cloudflare-dns.com/dns-query"
    weight = 70

## CloudFlare's resolver, bad ECS, good DNSSEC
## ECS is disabled for privacy by design: https://developers.cloudflare.com/1.1.1.1/nitty-gritty-details/#edns-client-subnet
## Note that some ISPs have problems connecting to 1.1.1.1, try 1.0.0.1 if problems happen.
#[[upstream.upstream_ietf]]
#    url = "https://1.1.1.1/dns-query"
#    weight = 50

## DNS.SB's resolver, good ECS, good DNSSEC
## The provider claims no logging: https://dns.sb/doh/
#[[upstream.upstream_ietf]]
#    url = "https://doh.dns.sb/dns-query"
#    weight = 50

## Quad9's resolver, bad ECS, good DNSSEC
## ECS is disabled for privacy by design: https://www.quad9.net/faq/#What_is_EDNS_Client-Subnet
#[[upstream.upstream_ietf]]
#    url = "https://9.9.9.9/dns-query"
#    weight = 50

## CloudFlare's resolver for Tor, available only with Tor
## Remember to disable ECS below when using Tor!
## Blog: https://blog.cloudflare.com/welcome-hidden-resolver/
#[[upstream.upstream_ietf]]
#    url = "https://dns4torpnlfs2ifuz2s2yf3fc7rdmsbhm6rw75euj35pac6ap25zgqad.onion/dns-query"
#    weight = 50


[others]
# Bootstrap DNS server to resolve the address of the upstream resolver
# If multiple servers are specified, a random one will be chosen each time.
# If empty, use the system DNS settings.
# If you want to preload IP addresses in /etc/hosts instead of using a
# bootstrap server, please make this list empty.
bootstrap = [

    # Google's resolver, bad ECS, good DNSSEC
    "8.8.8.8:53",
    "8.8.4.4:53",

    # CloudFlare's resolver, bad ECS, good DNSSEC
    #"1.1.1.1:53",
    #"1.0.0.1:53",

]

# The domain names here are directly passed to bootstrap servers listed above,
# allowing captive portal detection and systems without RTC to work.
# Only effective if at least one bootstrap server is configured.
passthrough = [
    "captive.apple.com",
    "connectivitycheck.gstatic.com",
    "detectportal.firefox.com",
    "msftconnecttest.com",
    "nmcheck.gnome.org",

    "pool.ntp.org",
    "time.apple.com",
    "time.asia.apple.com",
    "time.euro.apple.com",
    "time.nist.gov",
    "time.windows.com",
    "time.google.com",
]

# Timeout for upstream request in seconds
timeout = 30

# Disable HTTP Cookies
#
# Cookies may be useful if your upstream resolver is protected by some
# anti-DDoS services to identify clients.
# Note that DNS Cookies (an DNS protocol extension to DNS) also has the ability
# to track uesrs and is not controlled by doh-client.
no_cookies = true

# Disable EDNS0-Client-Subnet (ECS)
#
# DNS-over-HTTPS supports EDNS0-Client-Subnet protocol, which submits part of
# the client's IP address (/24 for IPv4, /56 for IPv6 by default) to the
# upstream server. This is useful for GeoDNS and CDNs to work, and is exactly
# the same configuration as most public DNS servers.
no_ecs = false

# Disable IPv6 when querying upstream
#
# Only enable this if you really have trouble connecting.
# Doh-client uses both IPv4 and IPv6 by default and should not have problems
# with an IPv4-only environment.
# Note that DNS listening and bootstrapping is not controlled by this option.
no_ipv6 = true

# Disable submitting User-Agent
#
# It is generally not recommended to disable submitting User-Agent because it
# is still possible to probe client version according to behavior differences,
# such as TLS handshaking, handling of malformed packets, and specific bugs.
# Additionally, User-Agent is an important way for the server to distinguish
# buggy, old, or insecure clients, and to workaround specific bugs.
# (e.g. doh-server can detect and workaround certain issues of DNSCrypt-Proxy
# and older Firefox.)
no_user_agent = false

# Enable logging
verbose = true
EOF


#enable startup and restart service
sudo systemctl stop systemd-resolved
sudo systemctl start doh-client
sudo systemctl disable systemd-resolved
sudo systemctl enable doh-client
#check port 53
netstat -plntu | grep 53

#final
change dns server to your raspberry ip address

#for debug
tail -f /var/log/syslog
journalctl -af