systemd services for shadowsocks, KCPTUN, simple obfs and shadowsocks server sample configuration + haproxy + haproxy external check script and privoxy for sure

haproxy healthcheck socks5

#!/bin/bash
/usr/bin/curl -sSf --socks5-hostname $(echo ${3}):$(echo ${4}) www.google.com >/dev/null

haproxy.cfg

global
	log /dev/log	local0
	log /dev/log	local1 notice
	#chroot /var/lib/haproxy
	stats socket /run/haproxy/admin.sock mode 660 level admin expose-fd listeners
	stats timeout 30s
	user haproxy
	group haproxy
	daemon
    external-check

	# Default SSL material locations
	ca-base /etc/ssl/certs
	crt-base /etc/ssl/private

	# Default ciphers to use on SSL-enabled listening sockets.
	# For more information, see ciphers(1SSL). This list is from:
	#  https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
	# An alternative list with additional directives can be obtained from
	#  https://mozilla.github.io/server-side-tls/ssl-config-generator/?server=haproxy
	ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:RSA+AESGCM:RSA+AES:!aNULL:!MD5:!DSS
	ssl-default-bind-options no-sslv3

defaults
	log	global
	mode	tcp
	option	tcplog
	option	dontlognull
        timeout connect 5000
        timeout client  50000
        timeout server  50000
	errorfile 400 /etc/haproxy/errors/400.http
	errorfile 403 /etc/haproxy/errors/403.http
	errorfile 408 /etc/haproxy/errors/408.http
	errorfile 500 /etc/haproxy/errors/500.http
	errorfile 502 /etc/haproxy/errors/502.http
	errorfile 503 /etc/haproxy/errors/503.http
	errorfile 504 /etc/haproxy/errors/504.http

#---------------------------------------------------------------------
# STATS frontend
#---------------------------------------------------------------------
frontend  stats
    bind *:8080
    option httplog
    mode http
    stats enable
    stats hide-version
    stats realm Haproxy\ Statistics
    stats uri /
    stats auth admin:admin

#---------------------------------------------------------------------
# TCP frontend
#---------------------------------------------------------------------
frontend  proxy
    bind *:8000
    use_backend proxy
    default_backend proxy

backend proxy
    option external-check
    external-check path "/bin:/var/lib/haproxy"
    external-check command /var/lib/haproxy/check.sh
    balance leastconn
    server  s1-obfs     127.0.0.1:1081 check
    server  s1-direct   127.0.0.1:1080 check backup

kcp-server.service

[Unit]
Description=kcptun Server
After=network.target

[Service]
ExecStart=/usr/sbin/kcptun-server -l 0.0.0.0:53 -t 127.0.0.1:8388 --key *d8JQw9n --crypt cast5 --mode fast3 --log /var/log/kcptun-server.log
ExecStop=/bin/kill $MAINPID
Restart=always

[Install]
WantedBy=multi-user.target

obfs-server.service

[Unit]
Description=Simple obfs server
After=network.target

[Service]
ExecStart=/usr/local/bin/obfs-server -p 443 --obfs http -r 127.0.0.1:8388>> /var/log/obfs-server.log
ExecStop=/bin/kill $MAINPID
Restart=always

[Install]
WantedBy=multi-user.target

privoxy config

hostname proxy.privoxy
listen-address  0.0.0.0:8118
listen-address  [::1]:8118
toggle  1
enable-remote-toggle  1
enable-remote-http-toggle  0
enable-edit-actions 1
enforce-blocks 0
buffer-limit 4096
enable-proxy-authentication-forwarding 0
forward-socks5      /       127.0.0.1:8000 .
forward             localhost/     .
forward             172.17.64.0/22    .
forwarded-connect-retries  1
accept-intercepted-requests 0
allow-cgi-request-crunching 0
split-large-forms 0
keep-alive-timeout 150
tolerate-pipelining 1
socket-timeout 300
max-client-connections 400

shadow.conf

{
    "server_port":8388,
    "password":"Fo0B@r",
    "method": "chacha20-ietf",
    "timeout":600
}

shadowsocks-server.service

[Unit]
Description=Shadowsocks Server
After=network.target

[Service]
ExecStart=/usr/sbin/shadowsocks-server -c /etc/shadowsocks/shadow.conf >> /var/log/shadowsocks-server.log
ExecStop=/bin/kill $MAINPID
Restart=always

[Install]
WantedBy=multi-user.target

How to use?

Just download and move binaries to desired location on server and make sure if they have x permission, then copy service files to /etc/systemd/system/ and run:

systemctl daemon-reload
systemctl enable --now shadowsocks-server.service
systemctl enable --now kcp-server.service
systemctl enable --now obfs-server.service