What is CloudLinux?
CloudLinux is a type of operating system based on Linux. It makes servers more stable and secure. This system helps control how resources are used on the server. One important feature is called LVE (Lightweight Virtual Environment). This feature keeps user accounts separate. Each account gets a set amount of memory and CPU. If one account gets too busy, only that account slows down. The rest of the server works fine. CloudLinux also limits how much memory, CPU, and connections each user can have. This way, one user cannot cause problems for everyone else. It helps keep websites running smoothly without crashes.
LVE Manager in CloudLinux
CloudLinux uses a feature called Lightweight Virtual Environment (LVE). This technology helps manage how resources are used on the server. It prevents one website from using too much CPU, memory, or other resources, which could slow down or crash the server.
The LVE Manager lets you do several things:
| Limit resources for each account: | You can set how much memory and CPU each account can use. |
|---|---|
| Create default packages | You can set up standard resource limits for new accounts. View usage history: You can see how much resources each account has used over time. |
| Identify problem users: | You can find users who are using too many resources and take action to fix it. |
| Find top users: | You can see which accounts use the most resources and offer them better plans. |
With the LVE Manager, you can control how much each user can use, making sure the server stays stable for everyone.
Understanding Resource Management in CloudLinux
CloudLinux helps smartly manage server resources. Here’s a simple breakdown of its main features:Memory Usage
CloudLinux keeps track of how much memory each user is using right now. By setting limits on memory, it helps prevent problems like running out of memory, which can slow down the server and clear important data caches.
IO Limits
IO limits are all about how much data each user can send and receive, measured in kilobytes per second (KB/s). Since data transfer can be a limited resource, having a cap (like 5 MB/s) ensures that everyone gets a fair share without one person hogging it.
CPU Limits
CPU limits define how much processing power each account can use. If a user maxes out their CPU limit, their processes will slow down. This is key for stopping sudden spikes in CPU usage, which can make the server sluggish.
Number of Processes
CloudLinux sets a limit on how many processes can run at the same time for each user. When someone hits that limit, they can't start new processes until others finish. A good starting point is around 100, which helps avoid issues like fork bombs.
Entry Processes
Entry processes are about how many scripts can run at the same time when visitors are on a site. Setting a limit (starting with around 10) stops one site from using all available slots, ensuring that the server stays responsive.
Inode Management
An inode stores information about files and folders on the server. The number of inodes shows how many files and folders an account has. While inode limits aren’t usually a problem if other resources are balanced, it’s good to keep an eye on this to optimize disk space.
CageFS
CageFS is a special virtual file system that keeps each user in their own “cage.” This setup allows each website to have its tools and files without affecting other websites on the server. CageFS ensures that only safe programs are available to users. It prevents users from seeing each other and stops them from finding out if other users are on the server or what their usernames are. Important server configuration files, like Apache configuration files, are hidden from users, and they can only see a limited view of the /proc file system.
CageFS will contain any script executions that happen through:
- Apache (using suexec, suPHP, mod_fcgid, or mod_fastcgi)
- LiteSpeed Web Server
- Cron Jobs
- SSH
- Any other services that use PAM (Pluggable Authentication Module)
MySQL Governor
The MySQL Governor monitors and controls MySQL usage on the server. It can stop slow queries, like long-running SELECT statements, and can operate in different modes based on how it's configured.
The MySQL Governor helps manage the following limits:
| CPU | This is measured as a percentage, with 100% meaning one CPU core. For example, 150% means the usage is equal to one and a half cores. |
|---|---|
| READ | Measured in bytes, this counts the total data read from the disk. Cached reads don’t count, only those that are read directly from the disk. |
| WRITE | Also measured in bytes, this tracks the total amount of data written to the disk. Cached writes are ignored; only data written to the disk is counted. |
PHP Selector
The PHP Selector is a tool that lets each user choose their own PHP version and modules based on what they need. It works with suPHP, mod_fcgid, CGI (suexec), and LiteSpeed.
Compatibility Issues
The CloudLinux PHP Selector does not work with mod_php/DSO, mod_ruid2, MPM ITK, or PHP_FPM.
SecureLinks
SecureLinks is a setting in CloudLinux that provides strong protection against symbolic link attacks. It helps keep the server secure by preventing unauthorized access through symbolic links.
CloudLinux OS Shared vs. CloudLinux OS Solo
Now that we understand what CloudLinux is, let's talk about the two main types: CloudLinux OS Shared and CloudLinux OS Solo.
| CloudLinux OS Shared | CloudLinux OS Shared works best for servers with many websites. It helps each site stay safe and run smoothly by managing how resources are used. |
|---|---|
| CloudLinux OS Solo | CloudLinux OS Solo is meant for servers that have only one website. It gives you the tools you need to manage that site well. |
For detailed installation guides for both CloudLinux OS Shared and CloudLinux OS Solo, please refer to the ServerMO page.
Conclusion
In summary, if you run several websites, go with CloudLinux OS Shared for better resource control. If you have just one website, CloudLinux OS Solo will give you the tools you need. Think about what you need for your hosting to make the best choice.
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