bos - Introduction to the bos command suite
The commands in the bos command suite are the administrative interface to the Basic OverSeer (BOS) Server, which runs on every file server machine to monitor the other server processes on it. If a process fails, the BOS Server can restart it automatically, taking into account interdependencies between it and other processes. The BOS Server frees system administrators from constantly monitoring the status of server machines and processes.
There are several categories of commands in the bos command suite:
Commands to administer server process binary files: bos getdate, bos install, bos prune, and bos uninstall.
Commands to maintain system configuration files: bos addhost, bos addkey, bos adduser, bos listhosts, bos listkeys, bos listusers, bos removehost, bos removekey, bos removeuser, and bos setcellname.
Commands to start and stop processes: bos create, bos delete, bos restart, bos shutdown, bos start, bos startup, and bos stop.
Commands to set and verify server process and server machine status: bos getlog, bos getrestart, bos getrestricted, bos setauth, bos setrestart, bos setrestricted and bos status.
A command to restore file system consistency: bos salvage.
Commands to obtain help: bos apropos and bos help.
The BOS Server and the bos commands use and maintain the following configuration and log files:
The /etc/yfs/server/CellServDB file lists the local cell's database server machines. These machines run the Backup, Protection and Volume Location (VL) Server processes, which maintain databases of administrative information. The database server processes consult the file to learn about their peers, whereas the other server processes consult it to learn where to access database information as needed. To administer the CellServDB file, use the following commands: bos addhost, bos listhosts, bos removehost, and bos setcellname.
The /etc/yfs/server/KeyFileExt file lists the server encryption keys that the server processes use to decrypt tickets presented by client processes and one another. To administer the KeyFileExt file, use the following commands: bos addkey, bos listkeys, and bos removekey.
The /etc/yfs/server/UserListExt file lists the user name of each administrator authorized to issue privileged bos and vos commands. To administer the UserListExt file, use the following commands: bos adduser, bos listusers, and bos removeuser.
The /etc/yfs/server/BosConfig file defines which AFS server processes run on the server machine, and whether the BOS Server restarts them automatically if they fail. It also defines when all processes restart automatically (by default once per week), when the BOS Server restarts processes that have new binary files (by default once per day), and whether the BOS Server will start in restricted mode. To administer the BosConfig file, use the following commands: bos create, bos delete, bos getrestart, bos getrestricted, bos setrestart, bos setrestricted, bos start, and bos stop.
The /var/log/yfs/BosLog file records important operations the BOS Server performs and error conditions it encounters.
For more details, see the reference page for each file.
The following arguments and flags are available on many commands in the bos suite. The reference page for each command also lists them, but they are described here in greater detail.
Names the cell in which to run the command. It is acceptable to abbreviate the cell name to the shortest form that distinguishes it from the other entries in the /etc/yfs/CellServDB file on the local machine. If the -cell argument is omitted, the command interpreter determines the name of the local cell by reading the following in order:
The value of the AFSCELL environment variable.
Do not combine the -cell and -localauth options. A command on which the -localauth flag is included always runs in the local cell whereas a command on which the -cell argument is included runs in the specified foreign cell.
Prints the online help for this command. All other valid options are ignored.
Constructs a server ticket using the server encryption key with the highest key version number in the local /etc/yfs/server/KeyFileExt file. The bos command interpreter presents the ticket, which never expires, to the BOS Server during mutual authentication.
Use this flag only when issuing a command on a server machine; client machines do not usually have a /etc/yfs/server/KeyFileExt file.
The issuer of a command that includes this flag must be logged on to the server machine as the local superuser
The flag is useful for commands invoked by an unattended application program,
such as a process controlled by the UNIX cron utility or by a cron entry in the machine's /etc/yfs/server/BosConfig file.
It is also useful if an administrator is unable to authenticate to AFS but is logged in as the local superuser
Do not combine the -cell and -localauth options. A command on which the -localauth flag is included always runs in the local cell whereas a command on which the -cell argument is included runs in the specified foreign cell. Also, do not combine the -localauth and -noauth flags.
Establishes an unauthenticated connection to the BOS Server,
in which the BOS Server treats the issuer as the unprivileged user
It is useful only when authorization checking is disabled on the server machine (during the installation of a file server machine or when the bos setauth command has been used during other unusual circumstances).
In normal circumstances,
the BOS Server allows only privileged users to issue commands that change the status of a server or configuration file,
and refuses to perform such an action even if the -noauth flag is provided.
Do not combine the -noauth and -localauth flags.
Indicates the AFS server machine on which to run the command.
Identify the machine by its IP address in dotted decimal format,
its fully-qualified host name (for example,
or by an abbreviated form of its host name that distinguishes it from other machines.
Successful use of an abbreviated form depends on the availability of a name service (such as the Domain Name Service or a local host table) at the time the command is issued.
For the commands that alter the administrative files shared by all server machines in the cell (the bos addhost, bos addkey, bos adduser, bos removehost, bos removekey, and bos removeuser commands), the appropriate machine should be the system control machine (the machine running the Update Server).
The cell should use the Update Server to distribute the contents of the /etc/yfs/server directory. Provide the name of the system control machine to bos. After issuing the command, allow up to five minutes for the Update Server to distribute the changed file to the other AFS server machines in the cell. If the specified machine is not the system control machine but is running an upclient process that refers to the system control machine, then the change will be overwritten when the process next brings over the relevant file from the system control machine.
(If the cell does not use the Update Server, repeatedly issue the command, naming each of the cell's server machines in turn. To avoid possible inconsistency problems, finish issuing the commands within a fairly short time. This method is not recommended. Use the Update Server instead.)
To issue any bos command that changes a configuration file or alters process status,
the issuer must be listed in the /etc/yfs/server/UserListExt file on the server machine named by the -server argument.
if the -localauth flag is included the issuer must be logged on as the local superuser
To issue a bos command that only displays information (other than the bos listkeys command), no privilege is required.
BosConfig(5), CellServDB(5), KeyFileExt(5), UserListExt(5), bos_addhost(8), bos_addkey(8), bos_adduser(8), bos_apropos(8), bos_create(8), bos_delete(8), bos_exec(8), bos_getdate(8), bos_getlog(8), bos_getrestart(8), bos_getrestricted(8), bos_help(8), bos_install(8), bos_listhosts(8), bos_listkeys(8), bos_listusers(8), bos_prune(8), bos_removehost(8), bos_removekey(8), bos_removeuser(8), bos_restart(8), bos_salvage(8), bos_setauth(8), bos_setcellname(8), bos_setrestart(8), bos_setrestricted(8), bos_shutdown(8), bos_start(8), bos_startup(8), bos_status(8), bos_stop(8), bos_uninstall(8)
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