RancherOS 1.5.0 Release asiest way to run Docker in production at scale. Everything in RancherOS is a container managed by Docker

Linux Distribution RancherOS 1.5.0 Release

Linux Distribution

RancherOS 1.5.0 Release Versions: Linux 4.14.85, Buildroot 2018.02.7, Docker 18.06.1-ce by default, RPi64 - Linux 4.9.80; Console - Alpine 3.8, CentOS 7.5.1804, Debian 9, Fedora 28, Ubuntu 18.04. Major features and enhancements: support for LUKS; support for WiFi and 4G/LTE


The smallest, easiest way to run Docker in production at scale. Everything in RancherOS is a container managed by Docker. This includes system services such as udev and rsyslog. RancherOS includes only the bare minimum amount of software needed to run Docker. This keeps the binary download of RancherOS very small. Everything else can be pulled in dynamically through Docker.

How this works

Everything in RancherOS is a Docker container. We accomplish this by launching two instances of Docker. One is what we call the system Docker which runs as the first process. System Docker then launches a container that runs the user Docker. The user Docker is then the instance that gets primarily used to create containers. We created this separation because it seemed logical and also it would really be bad if somebody did docker rm -f $(docker ps -qa) and deleted the entire OS.


  • Linux: 4.14.85
  • Buildroot: 2018.02.7
  • Docker docker-18.06.1-ce by default
  • RPi64: Linux 4.9.80
  • Console:
    • Alpine: 3.8
    • CentOS: 7.5.1804
    • Debian: stretch
    • Fedora: 28
    • Ubuntu: bionic

Major Features and Enhancements

  • Support for LUKS [#2551]
  • Support for WiFi and 4G/LTE [#2370]
  • Support for custom rootfs of os initrd [#2547]
  • Support for Hyper-V [#442]
  • Support for VMDK images [#2468]
  • Support for disabling access to the system from the console [#2380]
    • Added the ability to disable auto-login
    • Added the ability to ignore rancher.password
  • Support for multiple user-docker daemons [#2177]
  • Support for ARM server(Experimental) [#2302]
  • Support for built-in other consoles [#2603]
  • Support for vSphere network protocol profiles [#2490]
  • Enhancements for faster boot speed and lower memory footprint
    • Disabled repeated system image loading [#2467]
    • Added the ability to disable cloud-init [#2552]
    • Used gzip compression initrd instead of xz [#2392]
  • Enhancement for consoles
    • docker top is now available for all consoles [#2340]
    • scp is now available for CentOS and Fedora consoles [#2536]
    • xfsprogs is now available in the default console [#2541]

Major Bug Fixes since v1.4.2

  • Fixed an issue where RancherOS boots slowly due to low entropy [#2473]
  • Fixed an issue where open-iscsi cannot be used due to missing /run/lock directory [#2435]
  • Fixed an issue where some zombie processes cannot be cleaned up [#2550 #2578]
  • Fixed an issue where RANCHER_BOOT partition cannot be mounted automatically [#2492]
  • Fixed an issue where respawn.log is spammed with errors when there is no serial port on the machine [#2466]
  • Fixed an issue where the vmware datasource always reports as "available" on ESXi hypervisors even with no guestinfo being available [#2465]
  • Fixed an issue where DHCP is still available when static ip is set [#2521]
  • Fixed an issue where first boot is delayed by 30 seconds when using static IP configuration [#2469]
  • Fixed an issue where ssh keys cannot be injected on GCP [#2613]


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