This topic describes the feature updates of Aliyun Linux 2 images in order of their release time. Unless otherwise stated, the released updates apply to all Alibaba Cloud regions where Elastic Compute Service (ECS) is provided.

Image ID Release time Description
aliyun_2_1903_x64_20G_alibase_20200529.vhd May 29, 2020
  • Images are updated to the latest software versions compatible with CentOS 7.8. Common Vulnerabilities and Exposures (CVEs) are fixed.
  • /etc/image-id is added.
  • The tuned service is disabled.
  • Kernel updates:
    • The kernel is updated to the kernel-4.19.91-19.1.al7 version.
    • The kernel interface support provided by Alibaba Cloud kernel on the statistics of scheduling and memory QoS metrics is open sourced to perform fine-grained monitoring of Service Level Indicators (SLIs) related to scheduling and memory.
    • The kernel interface support provided by Alibaba Cloud kernel on priority control when a memcg is out of memory (OMM) is open sourced to improve protection on important processes during system OOM.
    • AMD QoS is supported.
    • The virtio pmem driver is supported.
    • The free page reporting feature is supported to enhance the awareness of hypervisors about idle memory of a guest OS and efficiently manage and utilize physical memory resources.
    • Memory compaction is optimized to alleviate memory fragmentation and improve the utilization of system memory.
    • Kernel bugs and security vulnerabilities are fixed.
aliyun_2_1903_x64_20G_alibase_20200324.vhd March 24, 2020
  • Images are updated to the latest software versions compatible with CentOS 7.7. CVEs are fixed.
  • The latest fixes for CVEs can be obtained through YUM.
  • The LTS version of Aliyun Linux 2 is released and /etc/alinux-release is updated to Aliyun Linux release 2.1903 LTS (Hunting Beagle).
  • The tuned service is enabled by default.
  • Kernel updates:
    • The kernel is updated to the kernel-4.19.91-18.al7 version.
    • NVMe devices are supported.
    • The Transparent Huge Pages (THP) feature is enabled by default to improve application performance.
    • io_uring is added.
    • Intel_idle and guest halt polling are enabled to improve the guest CPU performance.
    • ftrace syscalls is enabled to enhance the performance of the bpftrace tool.
    • Multiple Alibaba Cloud optimizations and bug fixes to the kernel including subsystems such as schedulers, memory, file systems, and block layers are open sourced.
    • Kernel security vulnerabilities are fixed.
aliyun_2_1903_x64_20G_alibase_20200221.vhd February 21, 2020
  • Images are updated to the latest software versions compatible with CentOS 7.7. CVEs are fixed.
  • IPv6 addresses are supported by default.
  • Kernel updates:
    • The kernel is updated to the kernel-4.19.81-17.1.al7 version.
    • Intel Cooper Lake CPU and Ice Lake CPU are supported.
    • The support for the AMD and ARM 64-bit CPU architectures is enhanced.
    • Persistent memory is supported.
    • The blk-iocost feature is provided. It is based on the cost model and the weight-based throttling function of blkio cgroup controllers. For more information, see Configure the weight-based throttling feature of blk-iocost.
    • The Pressure Stall Information (PSI) feature implemented with cgroup v1 interfaces is supported. For more information, see Enable the PSI feature for the cgroup v1 interface.
    • Multiple Alibaba Cloud optimizations and bug fixes to the kernel including subsystems such as schedulers, memory, file systems, and block layers are open sourced.
    • Kernel security vulnerabilities are fixed.
aliyun_2_1903_x64_20G_alibase_20200114.qboot.vhd January 14, 2020
  • Images are updated to the latest software version.
  • Kernel updates:
    • The kernel is updated to the 4.19.81-17.al7.x86_64 version.
    • Quick boot with qboot is supported.
  • Applicable regions: China (Beijing), China (Hangzhou), and China (Hong Kong).
aliyun_2_1903_64_20G_alibase_20190829.vhd August 29, 2019
  • Images are updated to the latest software version.
  • Kernel updates:
    • The kernel is updated to the kernel-4.19.57-15.1.al7.x86_64 version.
    • The Spectre-V1 SWAPGS vulnerability is fixed.
    • Issues with DM bio splitting code are fixed.
    • The default TCP congestion control algorithm is set to CUBIC.
    • The network is set to 10-eth0.network.
aliyun_2_1903_64_20G_alibase_20190619.vhd June 19, 2019
  • Images are updated to the latest software version.
  • Kernel updates:
    • The kernel is updated to the kernel-4.19.43-13.2.al7.x86_64 version.
    • The cgroup writeback feature implemented with cgroup v1 interfaces is supported.
    • Policy-based routing is supported.
    • The ss command from the iproute2 suite is supported by enabling the INET_DIAG kernel configuration.
    • The configurable net.ipv4.tcp_tw_timeout kernel interface is supported.
    • The following network-related CVEs are fixed:
      • CVE-2019-11477
      • CVE-2019-11478
      • CVE-2019-11479
aliyun-2.1903-x64-20G-alibase-20190507.vhd May 7, 2019
  • Images are updated to the latest software version.
  • The time synchronization delay that was present on instance startup is fixed.
  • The kernel is updated to the kernel-4.19.34-11.al7.x86_64 version and other issues are fixed.
aliyun-2.1903-x64-20G-alibase-20190327.vhd March 27, 2019
  • Aliyun Linux 2 is released.
  • The kernel-4.19.24-9.al7.x86_64 kernel version is used in Aliyun Linux 2.