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Upon booting from OpenBoot, Solaris has several different modes of operation, which are known as run levels or init states, so called because the init command is often used to change run levels, although init-wrapper scripts (such as shutdown) are also used. These init states, which can be single- or multiuser, often serve different administrative purposes and are mutually exclusive (i.e., a system can only ever be in one init state). Typically, a Solaris system that is designed to stay up indefinitely cycles through a predefined series of steps in order to start all the software daemons necessary for the

Part I:

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provision of basic system services, primary user services, and optional application services These services are often provided only during the time that a Solaris system operates in a multiuser run state, with services being initialized by run control (rc) shell scripts Usually, one run control script is created to start each system, user, or application service Fortunately, many of these scripts are created automatically for administrators during the Solaris installation process However, if you intend to install third-party software (such as a database server), you may need to create your own run control scripts in the /etc/initd directory to start up these services automatically at boot time This process is fully described in the Writing Control Scripts section, later in the chapter If the system needs to be powered off for any reason (eg.

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, a scheduled power outage) or switched into a special maintenance mode to perform diagnostic tests, there is also a cycle of iterating through a predefined series of run control scripts to kill services and preserve user data It is essential that you preserve this sequence of events so that data integrity is maintained For example, operating a database server typically involves communication between a server-side, data-writing process and a daemon listener process, which accepts new requests for storing information If the daemon process is not stopped prior to the data-writing process, it could accept data from network clients and store it in a cache, while the database has already been closed This could lead to the database being shut down in an inconsistent state, potentially resulting in data corruption and/or record loss.

It is essential that you apply your knowledge of shell scripting to rigorously manage system shutdowns and startups using run control scripts In terms of system startup, Solaris has some similarities to Microsoft Windows and Linux Although Solaris doesn t have an autoexecbat or configsys file, it does have a number of script files that are executed in a specific order to start services, just like Linux These scripts are typically created in the /etc/initd directory as Bourne shell scripts and are then symbolically linked into the run level directories Just as Microsoft Windows has Safe Modes, Solaris supports a number of different modes of operation, from restricted, single-user modes to full, multiuser run levels The complete set of run levels, with their respective run control script directories, is displayed in Table 4-1..

Run Level Description 0 1 2 3 4 5 6 S Hardware maintenance mode First multiuser state; NFS resources unavailable NFS resources available User-defined state Power down firmware state Operating system halted for reboot Administrative tasks and repair of corrupted file systems

in the event that we need to carry out work or maintenance. We also need to include a mains circuit breaker to protect against overcurrents or surges, which could be potentially damaging and dangerous. A circuit breaker is shown in Figure 10-43. And in addition, we need to be able to isolate the DC supply coming from our solar array. A DC isolator switch is shown in Figure 10-44. It is also interesting to see how much energy our solar array is producing. This can be useful for accounting purposes, say if we are selling the solar energy back to the grid, or simply to benchmark the performance of our solar system and see if it is in line with our design predictions. A watt hour meter is shown in Figure 10-45.

User Status Console access Multiuser Multiuser Not specified Console access Single user Console access

TABLE 4-1

4:

Run Level 0 1 2 3 4 5 6 S TABLE 4-2

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