Ispmanager 6 business documentation

Server requirements

We recommend that you choose a fault-tolerant dedicated or virtual server that is based on hypervisor virtualization or OVZ container virtualization. 

Ispmanager must not be installed on the same server with BILLmanager, DNSmanager, IPmanager or any other ISPsystem product.

Hardware requirements 

The main load on the server is provided by the sites located on it. We advise you to keep in mind that sites with databases and mailboxes use more server resources.

For the master server

ComponentRequirements for the control panelRequirements for the control panel and up to 100 sitesRequirements for the control panel and more than 100 sites
Number of clusters1-4 clusters5-10 clustersmore than 10 clusters
CPU2,4 GHzfrom 3 GHzfrom 3,4 GHz
RAM3 Gb6 Gb8 Gb
Disk space30 Gb40 Gbfrom 60 Gb


For the cluster nodes

ComponentRequirements for the control panelRequirements for the control panel and up to 100 sitesRequirements for the control panel and more than 100 sites
CPU1 GHz2.4 GHzfrom 3 GHz
Cores116from 24
RAM4 Gb16 Gbfrom 24 G
Disk space60 Gb120 Gbfrom 200 Gb

Allocate all available disk space for the root filesystem.

Software requirements

Supported operating systems  (amd64)

  • AlmaLinux 8, 9;
  • CentOS 7;
  • CloudLinux OS SHARED — installation is available only via the integration module.
  • Since January 2022, support for CentOS 8 has ended. Installation and operation of the control panel on a server with CentOS 8 is not supported. You can migrate to AlmaLinux 8 OS according to the instructions.  
  • You should install the panel on the server with the latest minor version of the operating system. Do not change the major version of the OS.

We strongly recommend to install ispmanager on a "clean" server. You should install a minimal version of the operating system, all the services that ispmanager requires will be installed automatically during software installation.

  • To ensure the best software performance, do not connect any third-party repositories.
  •  When installing ispmanager on an OVZ virtual server, check that the version of the OS kernel on the host server is not less than 2.6.32-042stab134.
  • The server with the control panel must use the static IP address specified in the network interface configuration file. If the IP address is assigned to the server using DHCP, the correct operation of the control panel is not guaranteed.

Firewall settings

Open the following ports to allow incoming and outgoing connections: 

  • 21/tcp — to send data through FTP;
  • 22/tcp — for remote access to a server through SSH;
  • 110, 143, 993, 995, 587, 465, 25/tcp — to send and receive emails;
  • 80, 443/tcp —  to handle user requests to websites on the server with ispmanager;
  • 1500/tcp —to access the ispmanager interface;
  • 53/tcp, 53/udp — for domain name servers;
  • 3306/tcp — for the database server.

To ensure uninterrupted access to the license servers, make sure the following server addresses are always available:


When configuring the network between cluster nodes we recommend doing the following: 

  • locate cluster nodes in the same data-center;
  • use two physical network interfaces on every cluster node.  Connect the first interface in a public network, the second interface should be connected to an internal one with cluster nodes only. 

This will enhance cluster reliability and will help to avoid network issues during migration.