Virtuozzo Hybrid Server 7.5 Update 1 (7.5.1-730)

Issue date: 2021-05-04

Applies to: Virtuozzo Hybrid Server 7.5

Virtuozzo Advisory ID: VZA-2021-021

1. Overview

Virtuozzo Hybrid Server 7.5 Update 1 introduces new features and provides stability and usability bug fixes. It also introduces a new kernel 3.10.0-1160.21.1.vz7.174.13.

2. New Features

  • New API calls to the Virtuozzo libvirt API. In particular, operations on running containers, network interfaces, as well as improved migration of virtual environments on Virtuozzo Storage. (PSBM-107278)

  • Virtuozzo Linux 8 can now be used as a guest OS in virtual machines. (PSBM-124672)

  • CentOS 8 containers can now be converted to Virtuozzo Linux 8 containers from the host. (PSBM-125549)

  • nftables and iptables NAT can now work on the same node. (PSBM-123345)

  • More alerts are now supported for Prometheus monitoring. (PSBM-107353)

  • Docker v20 and newer is now supported inside containers. (PSBM-123630)

  • Improved migration of virtual environments from Virtuozzo 6 to Virtuozzo Hybrid Server 7.5. (PSBM-122047)

  • Smart updates. Nodes running Virtuozzo Hybrid Server 7.5 can now be joined to a Kubernetes cluster for centralized update management. (PSBM-99602)

  • Improvements for the ‘ploop check’ tool. (PSBM-124721)

  • Support for the io_kaio engine for ploop images on Virtuozzo Hybrid Server 7.5. (PSBM-107807)

  • Support for the virtio socket device. (PSBM-125788)

  • New triggers and metrics for Zabbix monitoring. (PSBM-128087)

  • Better default values for the user.slice page cache limit to avoid high load on nodes. The upper limit for the user.slice page cache can now be configured. (PSBM-106301)

  • Page cache is no longer polluted by machine backups performed using a temporary directory. (PSBM-124729, PSBM-125588, PSBM-126467, PSBM-128082)

  • Support for remote authentication between dispatchers by means of RSA keys. (PSBM-126003)

  • It is now possible to install Virtuozzo Hybrid Server on disks too small for the recommended swap partition size. (PSBM-126174)

3. Bug Fixes

  • Revert ibpb patch in libvirt. (PSBM-123539)

  • firewalld not working in CentOS 8 containers. (PSBM-121318)

  • Libvirt hangs when reading long iptable outputs. (PSBM-123565)

  • Incorrect network traffic calculation. (PSBM-126938)

  • High swapin/swapout (high si/so values) in some circumstances. (PSBM-123655)

  • Ploop-balloon discard could get stuck on a ploop located on Virtuozzo Storage. (PSBM-125728)

  • Node hang crash due to insufficient swap size. (PSBM-122663)

  • CRIU migration could fail on old processors. (PSBM-127004)

  • Restoring a container from snapshot could fail due to a CRIU error. (PSBM-123644)

  • Other fixes (PSBM-128066, PSBM-127859, PSBM-127606, PSBM-127546, PSBM-127315, PSBM-127091, PSBM-127025, PSBM-127003, PSBM-126948, PSBM-126014, PSBM-125953, PSBM-125515, PSBM-125020, PSBM-124786, PSBM-124618, PSBM-124614, PSBM-124533, PSBM-124496, PSBM-123849, PSBM-123819, PSBM-123786, PSBM-123701, PSBM-123686, PSBM-123648, PSBM-123085, PSBM-123006, PSBM-122122, PSBM-122094, PSBM-122071, PSBM-121984, PSBM-121270, PSBM-120787, PSBM-107361, PSBM-106582, PSBM-102537, PSBM-98775)

4. Installing the Update

Install the update with ‘yum update’. Reboot the host and switch to the new kernel.

The JSON file with the list of new and updated packages is available at