Install Caddy v1.x on Debian

1_install_caddy.sh

#!/bin/bash

sudo apt-get install -y git libcap2-bin

echo 'install go lang'
wget -q https://storage.googleapis.com/golang/getgo/installer_linux
chmod +x installer_linux
./installer_linux
source ~/.bash_profile

echo 'install caddy'
go get github.com/caddyserver/caddy/caddy
sudo cp $GOPATH/bin/caddy /usr/local/bin/
sudo chown root:root /usr/local/bin/caddy
sudo chmod 755 /usr/local/bin/caddy
sudo setcap 'cap_net_bind_service=+ep' /usr/local/bin/caddy
sudo mkdir -p /etc/caddy/
sudo touch /etc/caddy/Caddyfile

sudo curl https://gist.githubusercontent.com/pstaender/8e53e3cc3f7747bd17beef1178b79208/raw/01baa1ca512dc8a9e40a3296c29341c8b15795b8/caddy.service > /etc/systemd/system/caddy.service

echo 'www-data	hard	nofile		8192' >> /etc/security/limits.conf
sudo chown -R www-data:www-data /etc/caddy/
sudo mkdir /etc/ssl/caddy
sudo chown -R www-data:www-data /etc/ssl/caddy

sudo systemctl daemon-reload
sudo systemctl status caddy
sudo systemctl start caddy
journalctl --follow _SYSTEMD_UNIT=caddy.service

caddy.service

[Unit]
Description=Caddy HTTP/2 web server
Documentation=https://caddyserver.com/docs
After=network.target
Wants=network.target

[Service]
Restart=on-failure
StartLimitInterval=86400
StartLimitBurst=5

; User and group the process will run as.
User=www-data
Group=www-data

Environment=CADDYPATH=/etc/ssl/caddy

ExecStart=/usr/local/bin/caddy -log stdout -agree=true -conf=/etc/caddy/Caddyfile -root=/var/tmp
ExecReload=/bin/kill -USR1 $MAINPID

KillMode=mixed
KillSignal=SIGQUIT
TimeoutStopSec=5s

LimitNOFILE=1048576
LimitNPROC=64

[Install]
WantedBy=multi-user.target

ubuntu.caddy.service

[Unit]
Description=Caddy HTTP/2 web server
Documentation=https://caddyserver.com/docs
After=network-online.target
Wants=network-online.target systemd-networkd-wait-online.service

[Service]
Restart=on-abnormal

; User and group the process will run as.
User=www-data
Group=www-data

; Letsencrypt-issued certificates will be written to this directory.
Environment=CADDYPATH=/etc/ssl/caddy

; Always set "-root" to something safe in case it gets forgotten in the Caddyfile.
ExecStart=/usr/bin/caddy -log stdout -agree=true -email=youremail -conf=/etc/caddy/Caddyfile -root=/var/tmp
ExecReload=/bin/kill -USR1 $MAINPID

; Use graceful shutdown with a reasonable timeout
KillMode=mixed
KillSignal=SIGQUIT
TimeoutStopSec=5s

; Limit the number of file descriptors; see `man systemd.exec` for more limit settings.
LimitNOFILE=1048576
; Unmodified caddy is not expected to use more than that.
LimitNPROC=512

; Use private /tmp and /var/tmp, which are discarded after caddy stops.
PrivateTmp=true
; Use a minimal /dev (May bring additional security if switched to 'true', but it may not work on Raspberry Pi's or other devices, so it has been disabled in this dist.)
PrivateDevices=false
; Hide /home, /root, and /run/user. Nobody will steal your SSH-keys.
ProtectHome=true
; Make /usr, /boot, /etc and possibly some more folders read-only.
ProtectSystem=full
; … except /etc/ssl/caddy, because we want Letsencrypt-certificates there.
;   This merely retains r/w access rights, it does not add any new. Must still be writable on the host!
ReadWriteDirectories=/etc/ssl/caddy

; The following additional security directives only work with systemd v229 or later.
; They further restrict privileges that can be gained by caddy. Uncomment if you like.
; Note that you may have to add capabilities required by any plugins in use.
;CapabilityBoundingSet=CAP_NET_BIND_SERVICE
;AmbientCapabilities=CAP_NET_BIND_SERVICE
;NoNewPrivileges=true

[Install]
WantedBy=multi-user.target