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Managing the Exadata Database Machine
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during the factory install process, and you will use only these preconfigured users to log in After logging in with the appropriate user, you have access to a variety of OS tools and the Cell Command-Line Interface (CellCLI) The CellCLI utility is available only on the Exadata Storage Servers, and if you need to access this utility from a remote host, you can use the Distributed Command Line Interface (dcli) The dcli utility has the ability to execute CellCLI commands, simultaneously and in parallel, against a set of Exadata Storage Servers, thereby eliminating the need to run the same command multiple times on each Exadata Storage Server Dcli comes in quite handy when performing certain configuration and monitoring steps The CellCLI and dcli utilities are discussed next
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Using CellCLI, you can configure the Exadata Storage Server Software components, perform administration tasks such as startup and shutdown of the Exadata Storage Server Software, and perform monitoring and maintenance activities CellCLI is a command-line executable that comes preinstalled on the Exadata Storage Servers and allows you to administer only the Storage Server on which the utility resides You can execute CellCLI either by directly logging on to the Storage Server or through a networked server that can access the Storage Server using SSH NOTE The term Cell is sometimes used to reference the Exadata Storage Server The Cell is also an object within the Exadata Storage Server that can be queried through CellCLI The Cell object refers to the Exadata Storage Server itself and stores its attributes such as the name, status, and network settings The commands that can be executed at the CellCLI prompt follow syntactical rules as with any other command-line interface The lexical syntax of CellCLI commands is
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{admin-command | object-command object} [options] ;
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The first part of the command indicates the type of the command, and this can be of type admin-command or the object-command The detailed description on the lexical syntax is given here:
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admin-command dictates an administration action to CellCLI These commands will perform operations that are directed to the CellCLI utility Common admin commands are START, SPOOL, HELP, and QUIT object-command will direct administrative actions to be performed on the cell objects The object command is qualified by an object clause, which is the cell object upon which the command will be applied Examples of cell objects are the cell disks, grid disks, flash cache, and the cell Common object commands are CREATE, ALTER, and LIST options provides the ability to specify additional parameters or options to the command
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CellCLI can be invoked in an interactive mode, which is the default mode and does not require any options to be specified at the command line The interactive mode allows users to execute multiple commands in a single session until the user executes the QUIT or EXIT command The following example invokes the CellCLI utility and runs the LIST command to list the attributes of the Cell object The Cell object is associated with the Exadata Storage Server and will store its attributes such as the cell name, online/offline status, and the IP addresses configured for the server The LIST command is explained in detail in the monitoring section of this chapter
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$> cellcli CellCLI> LIST CELL DETAIL CellCLI> QUIT
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You can also invoke CellCLI with the e option and supply the CellCLI command directly at the OS command line as shown next This command will display the same result as the previous example
$> cellcli -e LIST CELL DETAIL
5:
Managing the Exadata Database Machine
Exadata Storage Server OS Users and Privileges
The CellCLI utility does not have its own authentication mechanism and will rely on the operating system authentication of the Linux user Based upon the user that invokes CellCLI, the users will be assigned appropriate privileges within the CellCLI domain The pre-created OS users that you will use to log in to the Exadata Storage Server are root, celladmin, and cellmonitor, and these are the only users allowed on the Storage Servers These users are authorized to perform tasks related to administration, monitoring, and maintenance of the Exadata Storage Server and the Exadata Storage Server Software Since you will have super-user privileges on the server with the root user, remember that performing any modifications to the Exadata Storage Server or its components is prohibited by Oracle, and this includes installation and modification of both existing and new software and hardware components, except for the modifications done by applying ongoing Exadata Storage Server patches and upgrades The Exadata Storage Server OS users have the following characteristics and privileges associated with them:
cellmonitor The cellmonitor user can perform monitoring functions on the Exadata Storage Server using the CellCLI interface The user is authorized only to execute the CellCLI LIST command, and all other commands that modify the configuration of the Exadata Storage Server, such as CREATE and ALTER commands, are blocked for cellmonitor celladmin The celladmin user has the authority to perform administration tasks from the CellCLI interface The administration tasks include creating, altering, and deleting of cell objects, such as grid disks and cell disks The only CellCLI command that the celladmin user is not authorized to run is the CALIBRATE command, which is the command to capture I/O performance metrics of hard disks and Exadata Smart Flash Cache by exercising an I/O load against these devices At the OS level, the celladmin user can access the Automatic Diagnostics Repository Command Interface (adrci) utility to package incidents for sending to Oracle support
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