Base
Hardened build
minimal ports, security patches applied at build time
CentOS 7.3
Azure
Operating Systems
CentOS Linux 7.3.1611, pinned to that exact point release, for version locked legacy workloads
Overview
CentOS Linux is a free, open source community rebuild of Red Hat Enterprise Linux, binary compatible with RHEL. This image is CentOS Linux 7.3.1611, the point release published in December 2016, and it stays on that point release: the package repositories are pinned to the frozen 7.3.1611 vault, so a routine update applies the errata issued for 7.3 and does not roll the machine forward to 7.4 or later.
That matters when an application, a driver, a kernel module or a vendor support statement is certified against one specific CentOS 7 point release rather than the series as a whole. The root filesystem is a standard single partition xfs volume, the same layout as the CentOS 7 image.
CentOS Linux 7 reached end of life on 30 June 2024 and receives no further upstream security updates, and 7.3.1611 was itself superseded upstream by 7.4, 7.5, 7.6, 7.7, 7.8 and 7.9. This image is patched to the last packages that exist for 7.3.1611 and is provided for legacy migration and version pinned workloads. Plan a migration to a supported distribution for anything that must stay secure.
Why the cloudimg image
cloudimg builds this point release from the vault install tree rather than picking a dated cloud image, so the release the machine reports is a fact of how it was made, and then applies every package the 7.3 vault ever published. Every package on the image comes from the 7.3.1611 vault, with nothing borrowed from a later point release. There is no baked in credential: access is by the SSH key you choose at launch, password authentication is off and the root account is locked, and the machine identity and SSH host keys are regenerated uniquely on every instance, so no two machines share a secret. The repositories ship already repointed at the 7.3.1611 vault, so package management keeps working after the original mirrors were retired and the point release pin holds. SELinux stays in enforcing mode, the only port reachable off the machine is SSH, and a paired deployment guide tested against the exact image is included, with 24/7 cloudimg support while you migrate.
Common uses
- Running software certified against CentOS 7.3 specifically, rather than the CentOS 7 series
- Reproducing a legacy environment at the exact point release it was built and signed off on
- Lift and shift of a version pinned CentOS 7.3 estate into Azure as a migration step
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