apt install libc-ares-dev

apt install libev-dev

apt-get install libmbedtls-dev

wget https://github.com/jedisct1/libsodium/releases/download/1.0.13/libsodium-1.0.13.tar.gz
 tar xvzf libsodium-1.0.13.tar.gz
cd libsodium-1.0.13/
./configure
make
make install

sudo vi /etc/shadowsocks/ss-local-config.json 
{
    "server":"1.2.3.6",
    "server_port":8999,
    "local_address": "0.0.0.0",
    "local_port":8888,
    "password":"whereareyou",
    "timeout":300,
    "method":"aes-256-cfb",
    "fast_open": false,
    "mode": "tcp_and_udp"
}
 

ss-local -c /etc/shadowsocks/ss-local-config.json -v

 This system doesn't provide enough entropy to quickly generate high-quality random numbers.
Installing the rng-utils/rng-tools, jitterentropy or haveged packages may help.
On virtualized Linux environments, also consider using virtio-rng.
The service will not start until enough entropy has been collected.

yum install rng-tools
rngd -r /dev/urandom