Shadowsocks deployment and optimization on debian

This post might be a little bit of nooby, but I am just trying to help out those poor guys in China.
Get a server, AWS or vultr will do the job.
When selecting operating system, my personal suggestion is to install debian even though it is not the best server os.
Firstly you will need to do some optimizations if you want a nice server.
Step 1, adjust the maximum open files limit:
Open /etc/security/limits.conf with your favorite editor such as vim.
Add these two lines

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* soft nofile 51200
* hard nofile 52100

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Then, set the ulimit by executing:
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ulimit -n 51200

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Step 2, tune the kernel parameters:
Open /etc/sysctl.conf with your favorite editor.
Insert this in to the file:
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fs.file-max = 51200

net.core.rmem_max = 67108864
net.core.wmem_max = 67108864
net.core.netdev_max_backlog = 250000
net.core.somaxconn = 4096

net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 0
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_keepalive_time = 1200
net.ipv4.ip_local_port_range = 10000 65000
net.ipv4.tcp_max_syn_backlog = 8192
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_fastopen = 3
net.ipv4.tcp_mem = 25600 51200 102400
net.ipv4.tcp_rmem = 4096 87380 67108864
net.ipv4.tcp_wmem = 4096 65536 67108864
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_congestion_control = hybla

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Execute systemctl -p after this.
We should now start the server.
Install shadowsocks:
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sudo apt-get update
sudo apt-get install shadowsocks-libev

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Edit the configuration:
Open /etc/shadowsocks-libev/config.json with your favorite editor.
Insert this in to the config:
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{
"server":"server_ip",
"server_port":1780,
"local_port":1080,
"password":"passwd",
"timeout":600,
"method":"chacha20-ietf-poly1305"
}

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Replace server_ip with your server’s ip or domain name, replace passwd with your password.
Now execute sudo /etc/init.d/shadowsocks-libev start and you’re all done.

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