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10. Advanced Tasks¶

This chapter collects miscellaneous configuration and management tasks, some of which require a deeper knowledge of Linux and Virtuozzo Hybrid Server and should be performed with caution.

In this chapter:

10.1. Configuring Automatic Memory Management Policies
- 10.1.1. Restarting VCMMD
- 10.1.2. Optimizing Virtual Machine Memory Usage with Kernel Same-Page Merging
- 10.1.3. Managing Host Services with VCMMD
  - 10.1.3.1. Adjusting the Page Cache Limit for user.slice
- 10.1.4. Managing Virtuozzo Storage Services with VCMMD
10.2. Managing Dynamic Mitigation of Intel CPU Vulnerabilities
10.3. Creating Customized Containers
- 10.3.1. Using Golden Images
  - 10.3.1.1. Disabling Golden Images
- 10.3.2. Using Custom EZ Templates
  - 10.3.2.1. Migrating EZ Templates
  - 10.3.2.2. EZ Template Configuration Files
- 10.3.3. Creating Customized EZ Template RPMs
10.4. Installing Applications to Containers from EZ Templates
- 10.4.1. cPanel
- 10.4.2. ISPsystem ISPmanager
- 10.4.3. Plesk
- 10.4.4. JBMC Software DirectAdmin
10.5. Converting Containers with almaconvert8
10.6. Converting Containers to Virtual Machines with the c2v-convert Tool
- 10.6.1. Operation
- 10.6.2. Example 1: Converting a Single Container in Interactive Mode
- 10.6.3. Example 2: Converting Multiple Containers in Interactive Batch Mode
  - 10.6.3.1. Logging in Batch Mode
  - 10.6.3.2. Conversion in Batch Mode Using GNU Screen
- 10.6.4. Example 3: Converting Multiple Containers in Non-Interactive Batch Mode
  - 10.6.4.1. Batch File
  - 10.6.4.2. Example: Converting Containers in Unattended Mode Using Batch File
- 10.6.5. Troubleshooting
- 10.6.6. Usage Data Collection
10.7. Migrating PowerPanel Container from CentOS 7 to VzLinux 7
- 10.7.1. Prerequisites
- 10.7.2. Converting PowerPanel Container
- 10.7.3. Manual Reversion to Backup Container
10.8. Creating Virtual Environments with virt-install
10.9. Setting Up Docker and Kubernetes in Virtuozzo Containers
10.10. Managing Container Virtual Hard Disk Encryption
- 10.10.1. Setting Up Encryption Key Requester
- 10.10.2. Encrypting and Decrypting Container Virtual Hard Disks
- 10.10.3. Encrypting System Swap
10.11. Connecting to Virtual Machines and Containers via VNC
- 10.11.1. Securing VNC Connections with SSL
  - 10.11.1.1. Using a Certificate Chain to Encrypt VNC Connections
  - 10.11.1.2. Securing Previously Enabled VNC Connections
- 10.11.2. Enabling VNC Access to Virtual Machines and Containers
- 10.11.3. Connecting with a VNC Client
10.12. Managing iptables Modules
- 10.12.1. Using iptables Modules in Virtuozzo Hybrid Server
- 10.12.2. Using iptables Modules in Containers
  - 10.12.2.1. Configuring iptables Modules
  - 10.12.2.2. Using conntrack Rules and NAT Tables
10.13. Using SCTP in Containers and Virtual Machines
10.14. Creating Configuration Files for New Linux Distributions
10.15. Aligning Disks and Partitions in Virtual Machines
- 10.15.1. Aligning Partitions
- 10.15.2. Checking Partition Alignment in Existing Virtual Machines
  - 10.15.2.1. Linux Virtual Machines
  - 10.15.2.2. Windows Virtual Machines
- 10.15.3. Aligning Disks for Linux Virtual Machines
- 10.15.4. Aligning Partitions for Windows Virtual Machines
- 10.15.5. Creating a Template of a Virtual Machine with Aligned Partitions
10.16. Uninstalling Virtuozzo Guest Tools from Virtual Machines
- 10.16.1. Uninstalling Guest Tools from Linux Virtual Machines
- 10.16.2. Uninstalling Guest Tools from Windows Virtual Machines
10.17. Enabling Legacy VM Debug Mode
10.18. Installing Optional Packages
10.19. Enabling Nested Virtualization in Virtual Machines
10.20. Changing Server-wide Backup Configuration
10.21. Participating in Customer Experience Program
10.22. Customizing the Message of the Day (MOTD)
- 10.22.1. Setting a Custom Static MOTD
- 10.22.2. Setting a Custom Dynamic MOTD
10.23. Monitoring System Objects via SNMP
- 10.23.1. Enabling SNMP Access
- 10.23.2. Accessing System Objects via SNMP
- 10.23.3. Description of System Objects
10.24. Monitoring Nodes and Virtual Environments via Prometheus
- 10.24.1. Installing the Exporters
- 10.24.2. Configuring Prometheus
- 10.24.3. Configuring Grafana
- 10.24.4. Supported Alerts
10.25. Monitoring Nodes and Virtual Environments via Zabbix
- 10.25.1. Installing the Zabbix Agent
- 10.25.2. Configuring Zabbix Server
- 10.25.3. Supported Triggers
- 10.25.4. Managing Disk I/O Parameters
10.26. Setting Up RSA Authentication Between Nodes
10.27. Converting Third-Party Virtual Machines
10.28. Switching Ploop I/O Engines
10.29. Managing Windows Containers
- 10.29.1. Setting Up the Environment
  - 10.29.1.1. Configuring the Virtuozzo Hybrid Server Node
  - 10.29.1.2. Configuring Microsoft Windows Nodes
- 10.29.2. Creating Windows Containers
- 10.29.3. Starting, Listing, and Stopping Windows Containers
- 10.29.4. Running Commands in Windows Containers
- 10.29.5. Configuring Windows Container Parameters
- 10.29.6. Migrating Windows Containers
- 10.29.7. Managing Windows Container Backups
- 10.29.8. Troubleshooting Windows Containers
- 10.29.9. Uninstalling the Windows Containers Feature

Version 7.5 — Mar 18, 2025

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