admin Recently, there was an issue with a curl command that ran a script with php. The curl command would finish after a lengthy time as before it was completing within seconds. The issue turned out to be that the command was using the IPV6 connection where in the data center the IPV6 was not active. … Read more
How to expand a disk in Azure Windows https://querysurge.zendesk.com/hc/en-us/articles/115002530951-Azure-Expand-Disk- Linux https://docs.microsoft.com/en-us/azure/virtual-machines/linux/expand-disks
Subnet to Mask Bits conversion table Mask CIDR Length (Mask Bits) 128.0.0.0 1 192.0.0.0 2 224.0.0.0 3 240.0.0.0 4 248.0.0.0 5 252.0.0.0 6 254.0.0.0 7 255.0.0.0 8 255.128.0.0 9 255.192.0.0 10 255.224.0.0 11 255.240.0.0 12 255.248.0.0 13 255.252.0.0 14 255.254.0.0 15 255.255.0.0 16 255.255.128.0 17 255.255.192.0 18 255.255.224.0 19 255.255.240.0 20 255.255.248.0 21 255.255.252.0 22 … Read more
How to test apache. Create 2 files: testload.php test.php Create a php file testload.php that checks the existence of another file named test.php in the same directory of two CentOS 7 servers with the same hardware characteristics and load but with different MPM. One of them will use event and the other one will use … Read more
The term hairpinning comes from the fact that the traffic comes from one source into a router or similar devices, makes a U-turn and goes back the same way it came. Visualize this and you see something that looks like a hairpin. Hairpin NAT is a useful technique for accessing an internal server using a … Read more
Use this information when changing the hostname in centos 7. Ways to show the hostname How to change the hostname. In order to change or set a CentOS 7 machine hostname, use the hostnamectl command as shown in the below command excerpt. In order to apply the new hostname, a system reboot is required, issue … Read more
How to clean ubuntu up automatically. Set an alais up in the bash profile:
Here is how to quickly Determine which Mysql configuration file is being used
When booting an Azure VM, this error: 304.863321] —[ end Kernel panic – not syncing: VFS: Unable to mount root fs on unknown-block(0,0) Solution: remove old linux kernels, your /boot drive is out of space. -boot to grub and click on “Advanced options” -Select a previous kernel (should boot fine) login and enter command See … Read more
https://docs.plesk.com/en-US/onyx/advanced-administration-guide-linux/65871/