Category: Linux

Install R1Soft Agent

To install R1Soft Agent on CentOS, create a file

vi /etc/yum.repos.d/r1soft.repo

Add

[r1soft]
name=R1Soft Repository Server
baseurl=http://repo.r1soft.com/yum/stable/$basearch/
enabled=1
gpgcheck=0

Now you can install Agent with command

yum install serverbackup-enterprise-agent -y

Install module with command

r1soft-setup --get-module

Restart cdp-agent

/etc/init.d/cdp-agent restart

You can stop/start agent with command

service cdp-agent stop
service cdp-agent start
service cdp-agent status

Once installed, verify connectivity with command

serverbackup-setup --test-connection

See r1soft

January 11, 2018

Delta RPMs disabled
When i install software on CentOS server, i get following warning

Delta RPMs disabled because /usr/bin/applydeltarpm not installed.

You can install deltaparm package
```
yum install deltarpm -y
```
This will save you some bandwidth as yum will only download difference between previous package.
January 11, 2018
r1soft
r1soft is a backup software from https://www.r1soft.com

Installing Agent
- Install R1Soft Agent on CentOS
- Installing r1soft server backup agent on Debian/Ubuntu
r1Soft Setup
- Add Server to R1Soft Server Backup Manager
- Configure Server Backup in R1Soft Backup Manager
Using r1Soft Server Backup
- How to restore R1Soft Backup
r1Soft Errors
- r1Soft public key is not available
- r1soft get-module segmentation fault
See Backup
January 11, 2018
fs

btrfs

lsblk

xfs

January 11, 2018

btrfs

On Ubuntu, install it with

apt install btrfs-tools

To format a partition in btrfs, run

root@backup:~# mkfs.btrfs -L mydisk /dev/sdc
btrfs-progs v4.4
See http://btrfs.wiki.kernel.org for more information.

Performing full device TRIM (32.00GiB) ...
Label:              mydisk
UUID:               14049348-3ebd-4e4e-b932-f4a041e72e46
Node size:          16384
Sector size:        4096
Filesystem size:    32.00GiB
Block group profiles:
  Data:             single            8.00MiB
  Metadata:         DUP               1.01GiB
  System:           DUP              12.00MiB
SSD detected:       no
Incompat features:  extref, skinny-metadata
Number of devices:  1
Devices:
   ID        SIZE  PATH
    1    32.00GiB  /dev/sdc

root@backup:~# parted /dev/sdc print
Model: ATA QEMU HARDDISK (scsi)
Disk /dev/sdc: 34.4GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags: 

Number  Start  End     Size    File system  Flags
 1      0.00B  34.4GB  34.4GB  btrfs

root@backup:~#

To mount, use

mkdir /mydisk
mount /dev/sdc /mydisk

Since we don’t create any partition inside /dev/sdc, we just use sdc instead of normal sdc1.

I tried with /dev/sdc1, but did not work.

root@backup:~# mount /dev/sdc1 /mydisk
mount: special device /dev/sdc1 does not exist
root@backup:~# mount /dev/sdc /mydisk
root@backup:~#

January 11, 2018

zypper
zypper command is used for package management in OpenSUSE.

To update your system, run
```
zypper update
```
Install a Software
```
zypper install PACKAGE_NAME
```
Example

Finding Package

To find package that provide the software need, you can use
```
zypper search PACKAGE_NAME
```
Example
```
zypper search php
```
SUSE | openSUSE
January 9, 2018
yast

yast is configuration manager for openSUSE linux.

openSUSE

January 9, 2018
hostnamectl
To set hostname for your server in CentOS 7, run
```
hostnamectl set-hostname YOUR_HOST_NAME
```
January 9, 2018
CloudLinux
CloudLinux has 2 types of licenses, IP based and key based.

You can check the type of license you have at

https://cln.cloudlinux.com/console/check-license

If you have IP based, run
```
/usr/sbin/clnreg_ks --force
```
For key-based, run
```
/usr/sbin/rhnreg_ks --activationkey= --force
```
cagefs
cagefsctl
Set unlimited resources for a user in cloudlinux (lvectl)
Convert CentOS to CloudLinux
cagefs mount points exists
Install ImunifyAV on Cpanel Server
Uninstall CloudLinux imunify360
Install KernelCare
Connect to backend failed: connect to lsphp failed: 110

PHP Selector

selectorctl
Cpanel CloudLinux set all users to use alt-php
Enable CloudLinux PHP lsapi
CloudLinux EasyApache 4 Profile Missing
CloudLinux PHP Selector on Cpanel Server
CloudLinux PHP versions missing in PHP Selector
January 9, 2018

ufw

ufw is firewall in Ubuntu.

To enable

systemctl enable ufw

To list available apps, run

ufw app list

To see the status, run

ufw status

To see firewall rules in a numbered format

ufw status numbered

Stop ufw

ufw disable

Start ufw

ufw enable

Open Ports

Here are some commands to open ports.

ufw allow ssh
ufw allow http
ufw allow https
ufw allow 3333/tcp

Following command open tcp ports 8000 to 9000.

ufw allow 8000:9000/tcp

Disable all other ports by default for incoming and allow all outbound traffic

ufw default deny incoming
ufw default allow outgoing

Whitelist an IP

To allow an IP to access all services

ufw allow from IP_ADDR_HERE

To allow to specific PORT

ufw allow from IP_ADDR_HERE proto tcp to any port PORT_HERE
ufw allow from IP_ADDR_HERE proto udp to any port PORT_HERE

Enable Logging

To enable logging, run

ufw logging on

By default ufw logs to /var/log/kern.log.

To log to differnt file, edit

vi /etc/rsyslog.d/20-ufw.conf

Uncomment the line

:msg,contains,"[UFW " /var/log/ufw.log

rstart rsyslog

systemctl restart rsyslog

Allow cloudflare IP in ufw

for cfip in `curl -sw '\n' https://www.cloudflare.com/ips-v{4,6}`; do ufw allow proto tcp from $cfip comment 'Cloudflare IP'; done

See firewall

January 8, 2018

PowerDNS
Install PowerDNS

Install PowerDNS on Ubuntu 20.04

PowerDNS Command line

List all DNS Zones
```
pdns_control list-zones
pdns_control list-zones slave
```
Delete a DNZ Zone
```
pdnsutil delete-zone DOMAIN_NAME
```
To notify slave DNS server
```
pdns_control notify DOMAIN_NAME
```
PowerDNS Admin

Python Django application to manage PowerDNS servers.

https://github.com/PowerDNS-Admin/PowerDNS-Admin

powerdns cpanel
January 8, 2018
btc

See crypto-currency

January 8, 2018

Category: Linux

Installing Agent

r1Soft Setup

Using r1Soft Server Backup

r1Soft Errors

PHP Selector

Whitelist an IP

Enable Logging

Install PowerDNS

PowerDNS Command line

PowerDNS Admin