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.
r1soft is a backup software from https://www.r1soft.com
See Backup
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:~#
To set hostname for your server in CentOS 7, run
hostnamectl set-hostname YOUR_HOST_NAMECloudLinux 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
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
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
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
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
Install PowerDNS on Ubuntu 20.04
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
Python Django application to manage PowerDNS servers.
See crypto-currency
How to change varnish port in Ubuntu
To clear cache, run
/usr/bin/varnishadm -S /etc/varnish/secret -T 127.0.0.1:6082 "ban req.http.host ~ .*"
Get stats
varnishstat
See Varnish logs
varnishlog
To view logs for “Error 503 Service Unavailable” error.
varnishlog -q 'RespStatus == 503' -g request
mod_rpaf help with showing users real IP when site is behind a proxy or varnish.