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Homework and Emergencies Emergency UNIX and Linux Support Different OS Kernel Update Frequency Post 302559564 by solaris_1977 on Tuesday 27th of September 2011 12:22:11 PM
Old 09-27-2011
It is entirely depend on you and your applications criticality and compatibility, if you want to have new kernel every time. In my environment, it is not so much required. If you can afford little downtime, then Solaris Live Upgrade is a feature in Solaris, where you will update your kernel without having long downtime. It will be up with just a reboot after setting up all required things. I am not sure, if you have Solaris in your option.
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luactivate(1M)						  System Administration Commands					    luactivate(1M)

luactivate - activate a boot environment SYNOPSIS
/usr/sbin/luactivate [-l error_log] [-o outfile] [-s] [BE_name] [-X] DESCRIPTION
The luactivate command is part of a suite of commands that make up the Live Upgrade feature of the Solaris operating environment. See live_upgrade(5) for a description of the Live Upgrade feature. The luactivate command, with no arguments, displays the name of the boot environment (BE) that will be active upon the next reboot of the system. When an argument (a BE) is specified, luactivate activates the specified BE. luactivate activates a BE by making the BE's root partition bootable. On an x86 machine, this might require that you take steps following the completion of luactivate. If so, luactivate displays the correct steps to take. To successfully activate a BE, that BE must meet the following conditions: o The BE must have a status of "complete," as reported by lustatus(1M). o If the BE is not the current BE, you cannot have mounted the partitions of that BE (using lumount(1M) or mount(1M)). o The BE you want to activate cannot be involved in an lucompare(1M) operation. After activating a specified BE, luactivate displays the steps to be taken for fallback in case of any problem on the next reboot. Make note of these instructions and follow them exactly, if necessary. Note - Before booting a new BE, you must run luactivate to specify that BE as active. luactivate performs a number of tasks, described below, that ensure correct operation of the BE. In some cases, a BE is not bootable until after you have run the command. The luactivate command performs the following tasks: o The first time you boot from a newly created BE, Live Upgrade software synchronizes this BE with the BE that was last active. (This is not necessarily the BE that was the source for the newly created BE.) "Synchronize" here means that certain system files and directo- ries are copied from the last-active BE to the BE being booted. (See synclist(4).) Live Upgrade software does not perform this syn- chronization after a BE's initial boot, unless you use the -s option, described below. o If luactivate detects conflicts between files that are subject to synchronization, it issues a warning and does not perform the syn- chronization for those files. Activation can complete successfully, in spite of such a conflict. A conflict can occur if you upgrade one BE or another to a new operating system version or if you modify system files (for example, /etc/passwd) on one of the BEs. o luactivate checks to see whether upgrade problems occurred. For example, packages required for the correct operation of the operating system might be missing. The command can issue a warning or, if a BE is incomplete, can refuse activation. o luactivate determines whether the bootstrap program requires updating and takes steps to update if necessary. If a bootstrap program changed from on operating release to another, an incorrect bootstrap program might render an upgraded BE unbootable. See install- boot(1M). o luactivate modifies the root partition ID on a Solaris x86 disk to enable multiple BEs to reside on a single disk. In this configura- tion, if you do not run luactivate, booting of the BE will fail. See fmthard(1M) and dkio(7I). The luactivate command requires root privileges. OPTIONS
The luactivate command has the following options: -l error_log Error and status messages are sent to error_log, in addition to where they are sent in your current environment. -o outfile All command output is sent to outfile, in addition to where it is sent in your current environment. -s Causes synchronization to occur (see DESCRIPTION) even if next boot of a specified BE is not the first boot of that BE. Use this option with great caution, because you might not be aware or in control of changes that might have occurred in the last-active BE. If using -s, take special care when booting to an earlier release of Solaris than what is installed on the last-active BE. For example, consider that the last-active BE contains Solaris 9 and you want to activate a BE that contains Solaris 2.6. If you forced synchroniza- tion with the -s option, the BE containing Solaris 2.6 might be synchronized with files that, while compatible with Solaris 9, might not work under Solaris 2.6. -X Enable XML output. Characteristics of XML are defined in DTD, in /usr/share/lib/xml/dtd/lu_cli.dtd.<num>, where <num> is the version number of the DTD file. OPERANDS
BE_name Name of the BE to be activated. EXIT STATUS
The following exit values are returned: 0 Successful completion. >0 An error occurred. FILES
/etc/lutab list of BEs on the system /usr/share/lib/xml/dtd/lu_cli.dtd.<num> Live Upgrade DTD (see -X option) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWluu | +-----------------------------+-----------------------------+ SEE ALSO
lu(1M), lucancel(1M), lucompare(1M), lucreate(1M), lucurr(1M), ludelete(1M), ludesc(1M), lufslist(1M), lumake(1M), lumount(1M), lure- name(1M), lustatus(1M), luupgrade(1M), lutab(4), attributes(5), live_upgrade(5) SunOS 5.10 20 Nov 2003 luactivate(1M)

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