update-linux command

Command to automate the routine updating of packages and system upgrading for Unix systems.

update-linuk can check for updates (--check), install updates (--update) and do a system upgrade (--system-upgrade).

Supports Fedora like and Debian Like OS.

Fedora like includes Fedora, RHEL, Centos, Rocky etc that use DNF.

Debian like includes Dedian, Ubuntu etc that use apt.

update-linux uses ssh to run commands on the hosts being worked on.

It assumes that it can ssh root@<host> without a password prompt.

However when using the --self option to update localhost sudo will be used if not running as root. This will prompt for the sudo password as necessary. Normally update-linux will reboot a host if that is required, but when working on --self no reboot is done unless --force-reboot is used.

If running update-linux on a macOS system it is necessary to flush DNS so that freshly booted hosts can be accessed by host-name.

This is done with the command sudo killall -HUP mDNSResponder.

update-linux will refuse to update the host it is running on unless the -self options is used.

Normally a reboot is done at the conclusion of an update unless update-linux can determine that the reboot is not required.

update-linux update process

$ update-linux --update host

For an update the following steps are performed:

1. Update packages - if there is nothing to update stop here

   Fedora: dnf -vy update --refresh

   Debian: apt-get update --assume-yes then apt-get upgrade --assume-yes

2. Wait until all systemd jobs have finished

   systemctl list-jobs

   For example akmod building nvidia drivers for a new kernel

3. Check if a reboot is needed.

   dnf needs-restart -r

4. Reboot the host

   reboot

5. Report on state of any failed services

   systemctl --failed

udpate-linux check for updates

$ update-linux host --check

With the --check options these steps are performed:

1. Check if there are packages to update

   Fedora: dnf check-update --refresh

   Debian: apt-get update --assume-yes then apt-get upgrade --assume-no

2. Report on state of any failed services. Not possible upgrading localhost with --self.

   systemctl --failed

update-linux system-upgrade process

$ update-linux --system-upgrade=38 host

For a system-upgrade update-linux will update one release at a time.

This means that a host running Fedora 36 that is being upgraded to Fedora 38 will first be upgraded to Fedora 37.

This is done as it is the safer then attempting skip over releases that can have required side-effects.

Run the update-linux --system-upgrade once for each release that is be upgraded.

For a system-upgrade these steps are used:

1. Check the current version of the Fedora installation against the requested version.

   If the host is already running the requested version stop here.

2. Download packages

   dnf system-upgrade download --releasever=<version> --assumeyes

3. Reboot to run the system-upgrade

   dnf system-upgrade reboot

4. Wait for the system to reboot

   There is a limit of 45 minutes to wait for the reboot

5. Report on state of any failed services. Not possible upgrading localhost with --self.

   systemctl --failed

update-linux command

Usage: update-linux <options> <group>|<host>...
    group - read from the JSON config file:
            /home/barry/.config/org.barrys-emacs.update-linux.json

        each group is a list of hosts to be updated

    host - host to be updated

    options:
        --check default Off
            check if update is required

        --debug default Off
            print debug messages

        --exclude=<host> default None
            exclude the <host> from being updated

        --force-reboot default Off
            always reboot host even if no packages where updated

        --help default Off
            print this help

        --install-package=<package> default None
            install <package> only

        --list-config default Off
            list the configuration from the JSON config file

        --system-upgrade=<version> default None
            perform a system upgrade to version <version>

update-linux log files

All the log files are written to the configured logdir folder. Each log file include the date in its name. If update-linux is run more then once in a day the output of each run is appended the log files.

• update-summary-date.log

  Report the run of update-linux for all hosts.

• check-update-host-date.log

  Check update report for a host on date.

• install--host-date.log

  Install package report for a host on date.

• update-host-date.log

  Update report for a host on date.

• status-host-date.log

  Staus report for a host on date.

Examples

Check to see of updates are available for some Fedora hosts:

$ update-linux --check host1 host2

Install updates:

$ update-linux host1 host2

Apply a system upgrade to Fedora 38:

$ update-linux --system-upgrade=38 host3

update-linux configuration

The configuration for update-linux is stored in a JSON file.

On linux this is in ~/.config/org.barrys-emacs.update-linux.json and on macOS this is in ~/Library/Preferences/org.barrys-emacs.update-linux.json

Example configuration:

{
    "logdir":   "~/tmpdir",
    "group":
        {
            "all": [
                "router",
                "player",
                "vm"
                ],
            "vm": [
                "armf36",
                "armf37"
                ]
        }
}

The logdir is the where all the logs of the updates are written to which defaults to tempdir.

Groups are named list of hosts in the group dictionary.