Solaris Run States Introduction
Monday, October 27th, 2008Solaris运行级别表示系统的运行状态，每个level具体运行哪些服务和进程是由/etc/rc#.d目录下面的脚本决定的。举例来说，在有SunCluster的RAC环境下，对Oracle UDLM (ORCLudlm) 进行升级就需要先进入单用户模式，卸载老的ORCLudlm，然后安装新版本。 这个时候就需要boot -s
默认的服务的运行级别列表如下：
* 0: The system is at the PROM monitor (ok>) or security monitor (>) prompt. It is safe to shut down the system when it is at this init state.
* 1, s or S: This state is known as “single-user” or “system administrator” mode. Root is the only user on the system, and only basic kernel functions are enabled. A limited number of filesystems (usually only root and /usr) are mounted. This init state is often used for sensitive functions (such as kernel libc patches) or while troubleshooting a problem that is keeping the system from booting into multiuser mode.
* 2: Multiple users can log in. Most system services (except for NFS server and printer resource sharing) are enabled.
* 3: Normal operating state. NFS and printer sharing is enabled, where appropriate.
* 4: Usually undefined.
* 5: Associated with the boot -a command. The system is taken to init 0 and an interactive boot is started.
* 6: Reboot. This state takes the system to init state 0 and then to the default init state (usually 3, but can be redefined in the /etc/inittab file).
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