Improve CSF performance with ipset

For servers where the CSF firewall is running slowly using iptables, or may stop when large amounts of IP addresses are configured between iptables rules. This problem can be solved quickly by installing ipset. Ipset is a framework that belongs to the Linux kernel. Allows you to store combinations of IP addresses, networks, TCP / UDP ports, and MAC addresses. The data stored in the […]

How to archive old content?

This tutorial can help you compress or restore previous unused web content. If for some reason the developer of the previous website is not available, the server’s previous website code can be found, then it should be saved and saved and removed from the server. Because the source code for old web pages is usually not updated, it is likely to improve vulnerability and vulnerability. […]

Counting inodes per file, per directory

Occasionally, you may not be aware of the amount of free space on the server during server operation. How much and what kind of data the libraries store. For example, if you are curious about the number of files and folders (inodes) recursively in each folder under the public_html folder, enter the following command: find -xdev -printf ‘%h\n’ | sort | uniq -c | sort […]

How to force a Linux server to restart?

The above command allows sysrq to be used. This allows us to communicate directly with the kernel. The second step sends the trigger b (to restart) to sysrq, which forces a restart. The system will restart within a few minutes approximately as if the reset button was pressed on the machine. After restarting the system, you will be able to find and fix the problem.

How do I make a backup of the database?

mysql -u user_name -p database_name < db.sql

Choosing the right DNS resolver for VPS

Customers often ask us what DNS resolvers we recommend to use. However, it is not easy to answer this question if we consider the performance/uptime. We can now recommend using the following resolvers: Google Public DNS 8.8.8.8 8.8.4.4 2001:4860:4860::8888 2001:4860:4860::8844 NTT 129.250.35.250 129.250.35.251 2001:418:3ff::53 2001:418:3ff::1:53 Verisign Public DNS 64.6.64.6 64.6.65.6 2620:74:1b::1:1 2620:74:1c::2:2 Level 3 4.2.2.2 4.2.2.4

What can I do if my virtual server does not boot after the kernel update?

Issue Upgrading kernel(s) inside Linux guests to the following versions will break them. Updated guest(s) won’t ever boot and will crash on startup. Environment CentOS 6.x kernel version >= 2.6.32-754.2.1.el6.x86_64 Debian 9.x kernel version >= 4.9.0-7-amd64 Resolution The issue can be fixed in one of the following ways: Skip the recent kernel while updating guest’s packages: Update CentOS 6.x with: # yum update –exclude=kernel*2.6.32-754.2.1* Update Debian […]

How to set PTR record

You can also set the PTR record, please follow these steps: Log in at https://admin.dotroll.com and then click Services / My Services. Click the Active button on the services line and then the Manage button in the middle of the page on the Server Information tab. After loading the page, click the Network tab at the bottom of the page Select the IP address you want to edit, and then click [Edit] in the Reverse DNS column. In the popup window that [...]

Ordering a new VPS server

To use Dotroll Virtual Private Server (VPS), you must have an account payer account. If you don’t already have one, you can create one here. After the login, you can start the order in the Order -> Virtual Server menu. Steps for ordering: First, select the architecture. Then select the operating system type. After selecting the operating system, it is possible to select a version within […]

How to transfer a service another billing account?

Transfer steps: Log in to our system with your email address and password, then click on the Services / My Services menu item in the top menu line. Next, click the service you want to transfer, and then click Transfer service to user in the Actions box on the left. On the page that appears, in the Transfer to user: field, enter the email address or username of the person or organization to whom you […]

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