Author: ServerOk – ServerOK

install ShadowSocks client in Ubuntu 18.04

ShadowSocks client is part of shadowsocks package. This include both client and server. If you are looking to install server, see Install ShadowSocks server on Debian 10

To install ShadowSocks, run

apt install -y shadowsocks

1	apt install -y shadowsocks

ShadowSocks client is called sslocal, get installed in /usr/bin/sslocal.

On Ubuntu, no start up script provided with this package, so you need to create one or manually run sslocal when required.

Create a service file

vi /lib/systemd/system/shadowsocks-local@.service

1	vi /lib/systemd/system/shadowsocks-local@.service

Add following content

[Unit]
Description=Shadowsocks client mode service
Documentation=man:sslocal(1)
After=network-online.target

[Service]
Type=simple
User=nobody
Group=nogroup
ExecStart=/usr/bin/sslocal -q -c /etc/shadowsocks/%i.json
Restart=on-failure
RestartSec=30

[Install]
WantedBy=multi-user.target

[Unit]

Description=Shadowsocks client mode service

Documentation=man:sslocal(1)

After=network-online.target

[Service]

Type=simple

User=nobody

Group=nogroup

ExecStart=/usr/bin/sslocal -q -c /etc/shadowsocks/%i.json

Restart=on-failure

RestartSec=30

[Install]

WantedBy=multi-user.target

Now we need to create a configuration file with your ShadowSocks server IP and password.

mkdir /etc/shadowsocks/
vi /etc/shadowsocks/local.json

1 2	mkdir /etc/shadowsocks/ vi /etc/shadowsocks/local.json

Add following content

{
    "server":"YOUR_SERVER_IP",
    "server_port":8044,
    "local_address": "127.0.0.1",
    "local_port":8044,
    "password":"PASSWORD",
    "timeout":300,
    "method":"aes-256-cfb",
    "fast_open": false,
    "workers": 1,
    "prefer_ipv6": false
}

{

"server":"YOUR_SERVER_IP",

"server_port":8044,

"local_address": "127.0.0.1",

"local_port":8044,

"password":"PASSWORD",

"timeout":300,

"method":"aes-256-cfb",

"fast_open": false,

"workers": 1,

"prefer_ipv6": false

}

“server” = IP of the server where you installled ShadowSocks server.
“server_port” = Port used by ShadowSocks server
“password” = ShadowSocks server password.

local_port can be anything you like.

Enable shadowsocks service

systemctl enable shadowsocks-local@local

1	systemctl enable shadowsocks-local@local

To start

systemctl start shadowsocks-local@local

1	systemctl start shadowsocks-local@local

To see status

systemctl status shadowsocks-local@local

1	systemctl status shadowsocks-local@local

Now you can configure your browser or other sock proxy supported application using 127.0.0.1:8044. Here is how to configure firefox

Install ShadowSocks server on Debian 10

To install ShadowSocks server on Debian 10, run

apt install -y shadowsocks

1	apt install -y shadowsocks

Create config file

vi /etc/shadowsocks/config.json

1	vi /etc/shadowsocks/config.json

Add following

{
    "server":"SERVER_IP",
    "server_port":8044,
    "local_port":0,
    "password":"PASSWOARD_HERE",
    "timeout":600,
    "method":"aes-256-cfb"
}

{

"server":"SERVER_IP",

"server_port":8044,

"local_port":0,

"password":"PASSWOARD_HERE",

"timeout":600,

"method":"aes-256-cfb"

}

You can change server_port if required.

To enable service, run

systemctl enable shadowsocks-server@config

1	systemctl enable shadowsocks-server@config

To start shadowsocks proxy, run

systemctl start shadowsocks-server@config

1	systemctl start shadowsocks-server@config

For status/restart

systemctl status shadowsocks-server@config
systemctl restart shadowsocks-server@config

1 2	systemctl status shadowsocks-server@config systemctl restart shadowsocks-server@config

Cpanel find owner of a website

On Cpanel server, to find username for a web site, run

/scripts/whoowns DOMAIN_HERE

1	/scripts/whoowns DOMAIN_HERE

Example

Cpanel find owner

Install nslookup on ArchLinux

To install nslookup on ArchLinux, run

pacman -S dnsutils

1	pacman -S dnsutils

Setting up MineCraft Server in Ubuntu

To setup MineCraft server on Ubuntu, first you need to install Java.

apt install openjdk-8-jre -y

1	apt install openjdk-8-jre -y

Create a user to run minecraft

useradd -m --shell /bin/bash minecraft

1	useradd -m --shell /bin/bash minecraft

You can set a password if you want direct SSH login to this user or login as root, then “su – minecraft”.

passwd minecraft

1	passwd minecraft

Download minecraft server .jar file from

https://www.minecraft.net/en-us/download/server/

At the time of writing, i downloaded

wget https://launcher.mojang.com/v1/objects/3dc3d84a581f14691199cf6831b71ed1296a9fdf/server.jar

1	wget https://launcher.mojang.com/v1/objects/3dc3d84a581f14691199cf6831b71ed1296a9fdf/server.jar

Don’t use above link as it can get older, always go to minecraft site and get new link, so you get latest minecraft server jar file.

You can start minecraft server with command

java -Xmx1024M -Xms1024M -jar server.jar nogui

1	java -Xmx1024M -Xms1024M -jar server.jar nogui

First time when you run, it exit with some error related to EULA.

You need to edit file

vi eula.txt

1	vi eula.txt

Set

eula=true

eula=true

Now minecraft will run. You can create a run.sh file with following command for starting minecrat easily.

vi ~/start.sh

1	vi ~/start.sh

Paste following content

#!/bin/bash

java -Xmx1024M -Xms1024M -jar server.jar nogui

#!/bin/bash

java -Xmx1024M -Xms1024M -jar server.jar nogui

To make the file executable, chmod it 755

chmod 755 ~/start.sh

1	chmod 755 ~/start.sh

When you start minecraft from terminal/ssh, it get closed when you disconnect. To keep minecraft server running after you disconnect, use tmux or screen.

networking

On Ubuntu 19.04, networking service is provided by package ifupdown

apt install -y ifupdown

1	apt install -y ifupdown

By default this package is not installed. So if you add network interface configuration in /etc/network/interfaces, it won’t work.

Ubuntu 18.04 + use netplan instead of ifupdown/networking service to configure network interfaces.

Configure OVH Bridge Network from command line

Ubuntu Configure systemd-resolved

Latest Ubuntu/Debian use systemd-resolved for DNS resolution. On a fresh Ubuntu 19.04 install DNS failed to resolve.

root@ubuntu19:/# ping serverok.in
ping: serverok.in: Temporary failure in name resolution
root@ubuntu19:/#

root@ubuntu19:/# ping serverok.in

ping: serverok.in: Temporary failure in name resolution

root@ubuntu19:/#

To fix this, create file

mkdir /etc/systemd/resolved.conf.d/
vi /etc/systemd/resolved.conf.d/dns_servers.conf

1 2	mkdir /etc/systemd/resolved.conf.d/ vi /etc/systemd/resolved.conf.d/dns_servers.conf

Add content

[Resolve]
DNS=8.8.8.8 1.1.1.1

1 2	[Resolve] DNS=8.8.8.8 1.1.1.1

Restart systemd-resolved

systemctl restart systemd-resolved

1	systemctl restart systemd-resolved

You can find systemd-resolvd status with command

resolvectl status
systemd-resolve --status

1 2	resolvectl status systemd-resolve --status

To resolve a domain, use

resolvectl query serverok.in

1	resolvectl query serverok.in

Configure OVH Bridge Network from command line

If you have a Proxmox or VmWare ESXi server on OVH network, you need to configure network interface once virtual machine is created.

First login to OVH, go to IP page. Find the IP address you need to assign to this new VM, create a Virtual MAC. OVH allow 2 type of MAC. If you are using Proxmox, use OVH Mac. For VMWare ESXi, use vmware vmac.

Once you have Virual Mac. you need to configure it in your VM network interface settings. For Vmware ESXi

Now login to Virtial Machine, run following commands

ip link set NETWORK_INTERFACE_HERE up
ip addr add FO_IP_HERE dev NETWORK_INTERFACE_HERE
ip route add GW_IP_HERE dev NETWORK_INTERFACE_HERE
ip route add default via GW_IP_HERE dev NETWORK_INTERFACE_HERE

ip link set NETWORK_INTERFACE_HERE up

ip addr add FO_IP_HERE dev NETWORK_INTERFACE_HERE

ip route add GW_IP_HERE dev NETWORK_INTERFACE_HERE

ip route add default via GW_IP_HERE dev NETWORK_INTERFACE_HERE

In above, replace

NETWORK_INTERFACE_HERE = name of your network interface. This can be found with command “ip link”. Normally it is eth0 or ensXXX.

FO_IP_HERE = this is the Failover IP you will be using for this Virtual Machine.

GW_IP_HERE = This is gateway IP. For OVH network, it will be your servers MAIN IP address with last number replaced with 254.

Here is an actial example.

ip link set ens192 up
ip addr add 178.33.35.183 dev ens192
ip route add 149.202.199.254 dev ens192
ip route add default via 149.202.199.254 dev ens192

ip link set ens192 up

ip addr add 178.33.35.183 dev ens192

ip route add 149.202.199.254 dev ens192

ip route add default via 149.202.199.254 dev ens192

This settings will be lost when you reboot OS. For configuring network interface permanantly, you can do

Install iperf3 on ArchLinux

To install iperf3 on ArchLinux, run

pacman -S iperf3

1	pacman -S iperf3

To do speed test

[root@tvmovies1 ~]# iperf3 -c ping.online.net -p 5209
Connecting to host ping.online.net, port 5209
[  5] local 163.172.50.206 port 50430 connected to 62.210.18.40 port 5209
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   282 MBytes  2.36 Gbits/sec    0    720 KBytes       
[  5]   1.00-2.00   sec   280 MBytes  2.35 Gbits/sec    0    755 KBytes       
[  5]   2.00-3.00   sec   281 MBytes  2.36 Gbits/sec   11    755 KBytes       
[  5]   3.00-4.00   sec   280 MBytes  2.35 Gbits/sec    0    758 KBytes       
[  5]   4.00-5.00   sec   281 MBytes  2.36 Gbits/sec    0    758 KBytes       
[  5]   5.00-6.00   sec   256 MBytes  2.15 Gbits/sec  1507   42.4 KBytes       
[  5]   6.00-7.00   sec   115 MBytes   965 Mbits/sec  6917    130 KBytes       
[  5]   7.00-8.00   sec   114 MBytes   954 Mbits/sec  6643   48.1 KBytes       
[  5]   8.00-9.00   sec   114 MBytes   954 Mbits/sec  6749    119 KBytes       
[  5]   9.00-10.00  sec   112 MBytes   944 Mbits/sec  6923   38.2 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  2.07 GBytes  1.77 Gbits/sec  28750             sender
[  5]   0.00-10.00  sec  2.06 GBytes  1.77 Gbits/sec                  receiver

iperf Done.
[root@tvmovies1 ~]#

[root@tvmovies1 ~]# iperf3 -c ping.online.net -p 5209

Connecting to host ping.online.net, port 5209

[ 5] local 163.172.50.206 port 50430 connected to 62.210.18.40 port 5209

[ ID] Interval Transfer Bitrate Retr Cwnd

[ 5] 0.00-1.00 sec 282 MBytes 2.36 Gbits/sec 0 720 KBytes

[ 5] 1.00-2.00 sec 280 MBytes 2.35 Gbits/sec 0 755 KBytes

[ 5] 2.00-3.00 sec 281 MBytes 2.36 Gbits/sec 11 755 KBytes

[ 5] 3.00-4.00 sec 280 MBytes 2.35 Gbits/sec 0 758 KBytes

[ 5] 4.00-5.00 sec 281 MBytes 2.36 Gbits/sec 0 758 KBytes

[ 5] 5.00-6.00 sec 256 MBytes 2.15 Gbits/sec 1507 42.4 KBytes

[ 5] 6.00-7.00 sec 115 MBytes 965 Mbits/sec 6917 130 KBytes

[ 5] 7.00-8.00 sec 114 MBytes 954 Mbits/sec 6643 48.1 KBytes

[ 5] 8.00-9.00 sec 114 MBytes 954 Mbits/sec 6749 119 KBytes

[ 5] 9.00-10.00 sec 112 MBytes 944 Mbits/sec 6923 38.2 KBytes

- - - - - - - - - - - - - - - - - - - - - - - - -

[ ID] Interval Transfer Bitrate Retr

[ 5] 0.00-10.00 sec 2.07 GBytes 1.77 Gbits/sec 28750 sender

[ 5] 0.00-10.00 sec 2.06 GBytes 1.77 Gbits/sec receiver

iperf Done.

[root@tvmovies1 ~]#

Here we do speed test with http://ping.online.net, they run iperf3 server on port 5209

Install netdata on ArchLinux

First update the packages with

pacman -Syu

1	pacman -Syu

Install netdata

pacman -S netdata

1	pacman -S netdata

Enable and start netdata

systemctl enable netdata
systemctl start netdata

1 2	systemctl enable netdata systemctl start netdata