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SmartOS global zone tweaks

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SmartOS global zone tweaks Jonathan Perkin well-nigh me · rss · twitter · github SmartOS global zone tweaks Apr 13, 2012 tags: smartos The vital premise overdue SmartOS is to provide a netbooted global zone, and then do very work inside KVM or zone-based virtual machines. This has a number of advantages, not least that it’s trivial to upgrade to a newer release - you simply marching a newer image. However, the read-only nature of the global zone ways that if you want to make changes to the global zone, then they need to be read from permanent storage, rather than making changes as you would normally. SmartOS creates a /usbkey file system on stable storage which holds configuration for the global zone, and an init script /lib/svc/method/smartdc-config which sources the file /usbkey/config for configuration details. By default this will mostly include details you provided at install time, however there are spare values you can set to customise the global zone further. Here are a couple that I have found, and need for my personal use. Upload a root authorized_keys file The root user’s home directory is provided from the ramdisk, so any changes you make will be wiped out on the next boot. This is presumably so that newer images can make changes to the shell rc files, for example to update $PATH without worrying well-nigh all users having to merge these changes. However, I’m not one for typing in passwords all day, so in order to store a /root/.ssh/authorized_keys file you can do this: mkdir -p /usbkey/config.inc # paste your key into this file vi /usbkey/config.inc/authorized_keys reverberate "root_authorized_keys_file=authorized_keys" >>/usbkey/config The root_authorized_keys_file variable points to a file in /usbkey/config.inc, you can of undertow transpiration the name if you wish. Set a keyboard map By default a US keymap will be loaded for the console, if you want to use a variegated one then find a suitable layout in /usr/share/lib/keytables/type_6 (in my specimen uk) and then: reverberate "default_keymap=uk" >>/usbkey/configSquintfor increasingly tweaks As of time of writing (joyent_20120405T204624Z), these two towards to be the only tweaks misogynist which aren’t once used by default, however this may transpiration in the future. To see if there are any newer ones available, you can: grep CONFIG_ /lib/svc/method/smartdc-config and then have a deeper squint into the script to see how they are used ;-) Run ad-hoc scripts Note that while you may be tempted to think “aha, it’s just a shell script, I can use it like rc.local”, you can’t - it’s explicitly parsed into variables, and trying to put commands in will just unravel the init script. However, the /lib/svc/method/manifest-import script does import any SMF manifests it finds in /opt/custom/smf, so if you want to run wrong-headed scripts, then have a squint at @ryancnelson’s example and modify to suit your tastes. 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