If you need to terminate not active SSH session please use keys sequence:
Continue reading “How to kill SSH session / SSH hangout”
When you add new disk first you need to identify device path.
# fdisk -l
and find path to your new disk, e.g.
Continue reading “How to create partitions and format them under Linux (Centos 7)”
If you want to add new HDD to existing Linux virtual machine like CentOS 7 / RHEL 7 you must:
First add new disk in preferences of virtual machine.
Click Edit preferences of virtual machine. On tab Hardware click Add button and fill proper preferences.
When you save data new hardware should appear on hardware list.
Now login to your virtual machine and execute:
# fdisk -l
You should see all previous mounted hardware.
Continue reading “How to add new disk in VMware / ESXi / vCenter without rebooting”
When you make new entries in /etc/fstab or lost connection to network (e.g. samba) share it is possible to remount all disconnected devices.
To do so you need to execute:
Continue reading “How to mount devices or shares without rebooting system / reload fstab”
If you are dealing with high IO wait on linux machine then you must detect which application causing this.
This will show list of current running applications.
Continue reading “How to deal with high IO in linux”
Sometimes we need to see the size of all tables in our MySql/MariaDB database.
The easiest way is to make such query:
Continue reading “How to count all tables size in MySql/MariaDB database”
If you want to make copy of all messages sent through email accout then create file /etc/postfix/sender_bcc with contents:
#emails from #BCC to
Then edit /postfix/main.cf file and add at the end of file
Continue reading “How to make email copy of all sent messages (auto BCC) in Postfix”
Sometimes we struggle with slow or broken repository.
First make sure that the yum-fastestmirror plugin is enabled.
Then clear cache with:
Continue reading “How to disable yum repository”
First genarate RSA private key.
Use 2048 bit or even better 4096 bit key
openssl genrsa 2048 > host.key
Now generate signing request.
enter *.domain.com for the Common Name
openssl req -new -x509 -nodes -sha256 -days 3650 -key host.key > host.crt
Continue reading “How to generate self signed wildcard ssl certificate”
Connect to the XenServer via SSH.
Create designed directory, e.g.:
Then run following command:
Put in “location=” param correct path
Continue reading “XenServer create local ISO Storage Repository”