Article ID: 124005, created on Dec 22, 2014, last review on Sep 10, 2015

  • Applies to:
  • Virtuozzo containers for Linux 4.7

Issue date: 2014-12-22

1. What's Included in This Update

This update includes a new Virtuozzo Containers for Linux 4.7 kernel (2.6.32-042stab102.9) based on the Red Hat Enterprise Linux 6.6 kernel (2.6.32-504.1.3.el6). The new kernel introduces security and stability fixes.

2. Bug Fixes

  • 'procfs' filesystem virtualization has been enhanced. (#PSBM-27933)

  • The inactive memory reclaimer algorithm had been corrected in order to avoid possible several-second-long process freezes even with plenty of free RAM. (#PSBM-28058)

  • The 'lsblk' utility running inside a Container could fail to show ploop devices assigned to the Container. NOTE: 'lsblk' never shows the root ploop disk device inside a Container. (#PSBM-29112)

  • The 'free' utility inside a CentOS7/RHEL7-based Container could show incorrect cached memory size. (#PSBM-29352)

  • Under certain circumstances, disabling connection tracking on the Hardware Node with 'ip_conntrack_disable_ve0=1' could fail, potentially degrading network performance. (#PSBM-29553)

  • Kernel memory could leak in case the Hardware Node had the VZFS filesystem on an NFS volume. (#PSBM-29924)

  • The memory reclaimer code has been enhanced to work more effectively with thousands of small Containers, each using several hundred of kilobytes of RAM. (#PSBM-29968)

  • Under certain circumstances, establishing PPP connections inside a Container could cause kernel panics. (#PSBM-29975, OVZ# 3114)

  • The OS release information stored in VDSO has been virtualized to enable running Containers on modern distributions like OpenSuSE 13.2. (#PSBM-30093, OVZ# 2768)

  • The CPU features verification algorithm used in online Container migration has been enhanced with proper checks for the 'xsave' CPU feature which should be handled separately. (#PSBM-30158, OVZ# 3012)

  • The iptables 'connlimit' modules could fail to work inside Containers. (#PSBM-30231, OVZ# 3061)

  • Under certain circumstances, a 'mount' operation could hang indefinitely. (#PSBM-30373)

  • Online migration error handling has been enhanced in order to prevent possible kernel panics. (#PSBM-30546, OVZ# 3139)

  • An error on connection tracking data restoration during online Container migration could lead to a kernel panic. (#PSBM-30844, OVZ# 3151)

3. Obtaining the Update

You can download and install the update using the vzup2date utility included in the Virtuozzo Containers for Linux 4.7 distribution set.

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